![Linus Torvalds](/assets/img/avatar_default.png)
Pull x32 support for x86-64 from Ingo Molnar: "This tree introduces the X32 binary format and execution mode for x86: 32-bit data space binaries using 64-bit instructions and 64-bit kernel syscalls. This allows applications whose working set fits into a 32 bits address space to make use of 64-bit instructions while using a 32-bit address space with shorter pointers, more compressed data structures, etc." Fix up trivial context conflicts in arch/x86/{Kconfig,vdso/vma.c} * 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (71 commits) x32: Fix alignment fail in struct compat_siginfo x32: Fix stupid ia32/x32 inversion in the siginfo format x32: Add ptrace for x32 x32: Switch to a 64-bit clock_t x32: Provide separate is_ia32_task() and is_x32_task() predicates x86, mtrr: Use explicit sizing and padding for the 64-bit ioctls x86/x32: Fix the binutils auto-detect x32: Warn and disable rather than error if binutils too old x32: Only clear TIF_X32 flag once x32: Make sure TS_COMPAT is cleared for x32 tasks fs: Remove missed ->fds_bits from cessation use of fd_set structs internally fs: Fix close_on_exec pointer in alloc_fdtable x32: Drop non-__vdso weak symbols from the x32 VDSO x32: Fix coding style violations in the x32 VDSO code x32: Add x32 VDSO support x32: Allow x32 to be configured x32: If configured, add x32 system calls to system call tables x32: Handle process creation x32: Signal-related system calls x86: Add #ifdef CONFIG_COMPAT to <asm/sys_ia32.h> ...
3660 lines
86 KiB
C
3660 lines
86 KiB
C
/*
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* linux/fs/proc/base.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* proc base directory handling functions
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*
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* 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
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* Instead of using magical inumbers to determine the kind of object
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* we allocate and fill in-core inodes upon lookup. They don't even
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* go into icache. We cache the reference to task_struct upon lookup too.
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* Eventually it should become a filesystem in its own. We don't use the
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* rest of procfs anymore.
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*
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*
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* Changelog:
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* 17-Jan-2005
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* Allan Bezerra
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* Bruna Moreira <bruna.moreira@indt.org.br>
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* Edjard Mota <edjard.mota@indt.org.br>
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* Ilias Biris <ilias.biris@indt.org.br>
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* Mauricio Lin <mauricio.lin@indt.org.br>
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*
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* Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
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*
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* A new process specific entry (smaps) included in /proc. It shows the
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* size of rss for each memory area. The maps entry lacks information
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* about physical memory size (rss) for each mapped file, i.e.,
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* rss information for executables and library files.
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* This additional information is useful for any tools that need to know
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* about physical memory consumption for a process specific library.
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*
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* Changelog:
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* 21-Feb-2005
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* Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
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* Pud inclusion in the page table walking.
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*
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* ChangeLog:
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* 10-Mar-2005
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* 10LE Instituto Nokia de Tecnologia - INdT:
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* A better way to walks through the page table as suggested by Hugh Dickins.
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*
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* Simo Piiroinen <simo.piiroinen@nokia.com>:
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* Smaps information related to shared, private, clean and dirty pages.
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*
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* Paul Mundt <paul.mundt@nokia.com>:
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* Overall revision about smaps.
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*/
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#include <asm/uaccess.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/task_io_accounting_ops.h>
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#include <linux/init.h>
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#include <linux/capability.h>
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#include <linux/file.h>
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#include <linux/fdtable.h>
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#include <linux/string.h>
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#include <linux/seq_file.h>
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#include <linux/namei.h>
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#include <linux/mnt_namespace.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/rcupdate.h>
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#include <linux/kallsyms.h>
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#include <linux/stacktrace.h>
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#include <linux/resource.h>
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#include <linux/module.h>
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#include <linux/mount.h>
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#include <linux/security.h>
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#include <linux/ptrace.h>
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#include <linux/tracehook.h>
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#include <linux/cgroup.h>
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#include <linux/cpuset.h>
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#include <linux/audit.h>
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#include <linux/poll.h>
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#include <linux/nsproxy.h>
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#include <linux/oom.h>
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#include <linux/elf.h>
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#include <linux/pid_namespace.h>
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#include <linux/fs_struct.h>
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#include <linux/slab.h>
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#include <linux/flex_array.h>
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#ifdef CONFIG_HARDWALL
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#include <asm/hardwall.h>
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#endif
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#include <trace/events/oom.h>
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#include "internal.h"
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/* NOTE:
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* Implementing inode permission operations in /proc is almost
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* certainly an error. Permission checks need to happen during
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* each system call not at open time. The reason is that most of
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* what we wish to check for permissions in /proc varies at runtime.
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*
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* The classic example of a problem is opening file descriptors
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* in /proc for a task before it execs a suid executable.
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*/
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struct pid_entry {
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char *name;
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int len;
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umode_t mode;
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const struct inode_operations *iop;
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const struct file_operations *fop;
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union proc_op op;
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};
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#define NOD(NAME, MODE, IOP, FOP, OP) { \
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.name = (NAME), \
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.len = sizeof(NAME) - 1, \
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.mode = MODE, \
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.iop = IOP, \
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.fop = FOP, \
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.op = OP, \
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}
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#define DIR(NAME, MODE, iops, fops) \
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NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
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#define LNK(NAME, get_link) \
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NOD(NAME, (S_IFLNK|S_IRWXUGO), \
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&proc_pid_link_inode_operations, NULL, \
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{ .proc_get_link = get_link } )
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#define REG(NAME, MODE, fops) \
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NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
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#define INF(NAME, MODE, read) \
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NOD(NAME, (S_IFREG|(MODE)), \
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NULL, &proc_info_file_operations, \
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{ .proc_read = read } )
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#define ONE(NAME, MODE, show) \
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NOD(NAME, (S_IFREG|(MODE)), \
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NULL, &proc_single_file_operations, \
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{ .proc_show = show } )
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static int proc_fd_permission(struct inode *inode, int mask);
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/*
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* Count the number of hardlinks for the pid_entry table, excluding the .
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* and .. links.
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*/
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static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
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unsigned int n)
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{
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unsigned int i;
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unsigned int count;
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count = 0;
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for (i = 0; i < n; ++i) {
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if (S_ISDIR(entries[i].mode))
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++count;
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}
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return count;
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}
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static int get_task_root(struct task_struct *task, struct path *root)
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{
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int result = -ENOENT;
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task_lock(task);
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if (task->fs) {
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get_fs_root(task->fs, root);
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result = 0;
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}
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task_unlock(task);
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return result;
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}
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static int proc_cwd_link(struct dentry *dentry, struct path *path)
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{
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struct task_struct *task = get_proc_task(dentry->d_inode);
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int result = -ENOENT;
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if (task) {
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task_lock(task);
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if (task->fs) {
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get_fs_pwd(task->fs, path);
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result = 0;
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}
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task_unlock(task);
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put_task_struct(task);
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}
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return result;
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}
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static int proc_root_link(struct dentry *dentry, struct path *path)
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{
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struct task_struct *task = get_proc_task(dentry->d_inode);
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int result = -ENOENT;
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if (task) {
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result = get_task_root(task, path);
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put_task_struct(task);
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}
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return result;
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}
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struct mm_struct *mm_for_maps(struct task_struct *task)
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{
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return mm_access(task, PTRACE_MODE_READ);
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}
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static int proc_pid_cmdline(struct task_struct *task, char * buffer)
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{
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int res = 0;
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unsigned int len;
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struct mm_struct *mm = get_task_mm(task);
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if (!mm)
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goto out;
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if (!mm->arg_end)
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goto out_mm; /* Shh! No looking before we're done */
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len = mm->arg_end - mm->arg_start;
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if (len > PAGE_SIZE)
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len = PAGE_SIZE;
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res = access_process_vm(task, mm->arg_start, buffer, len, 0);
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// If the nul at the end of args has been overwritten, then
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// assume application is using setproctitle(3).
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if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
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len = strnlen(buffer, res);
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if (len < res) {
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res = len;
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} else {
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len = mm->env_end - mm->env_start;
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if (len > PAGE_SIZE - res)
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len = PAGE_SIZE - res;
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res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
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res = strnlen(buffer, res);
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}
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}
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out_mm:
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mmput(mm);
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out:
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return res;
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}
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static int proc_pid_auxv(struct task_struct *task, char *buffer)
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{
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struct mm_struct *mm = mm_for_maps(task);
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int res = PTR_ERR(mm);
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if (mm && !IS_ERR(mm)) {
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unsigned int nwords = 0;
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do {
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nwords += 2;
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} while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
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res = nwords * sizeof(mm->saved_auxv[0]);
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if (res > PAGE_SIZE)
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res = PAGE_SIZE;
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memcpy(buffer, mm->saved_auxv, res);
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mmput(mm);
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}
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return res;
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}
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#ifdef CONFIG_KALLSYMS
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/*
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* Provides a wchan file via kallsyms in a proper one-value-per-file format.
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* Returns the resolved symbol. If that fails, simply return the address.
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*/
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static int proc_pid_wchan(struct task_struct *task, char *buffer)
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{
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unsigned long wchan;
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char symname[KSYM_NAME_LEN];
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wchan = get_wchan(task);
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if (lookup_symbol_name(wchan, symname) < 0)
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if (!ptrace_may_access(task, PTRACE_MODE_READ))
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return 0;
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else
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return sprintf(buffer, "%lu", wchan);
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else
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return sprintf(buffer, "%s", symname);
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}
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#endif /* CONFIG_KALLSYMS */
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static int lock_trace(struct task_struct *task)
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{
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int err = mutex_lock_killable(&task->signal->cred_guard_mutex);
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if (err)
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return err;
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if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) {
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mutex_unlock(&task->signal->cred_guard_mutex);
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return -EPERM;
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}
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return 0;
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}
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static void unlock_trace(struct task_struct *task)
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{
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mutex_unlock(&task->signal->cred_guard_mutex);
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}
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#ifdef CONFIG_STACKTRACE
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#define MAX_STACK_TRACE_DEPTH 64
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static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *task)
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{
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struct stack_trace trace;
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unsigned long *entries;
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int err;
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int i;
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entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
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if (!entries)
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return -ENOMEM;
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trace.nr_entries = 0;
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trace.max_entries = MAX_STACK_TRACE_DEPTH;
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trace.entries = entries;
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trace.skip = 0;
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err = lock_trace(task);
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if (!err) {
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save_stack_trace_tsk(task, &trace);
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for (i = 0; i < trace.nr_entries; i++) {
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seq_printf(m, "[<%pK>] %pS\n",
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(void *)entries[i], (void *)entries[i]);
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}
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unlock_trace(task);
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}
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kfree(entries);
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return err;
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}
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#endif
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#ifdef CONFIG_SCHEDSTATS
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/*
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* Provides /proc/PID/schedstat
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*/
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static int proc_pid_schedstat(struct task_struct *task, char *buffer)
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{
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return sprintf(buffer, "%llu %llu %lu\n",
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(unsigned long long)task->se.sum_exec_runtime,
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(unsigned long long)task->sched_info.run_delay,
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task->sched_info.pcount);
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}
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#endif
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#ifdef CONFIG_LATENCYTOP
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static int lstats_show_proc(struct seq_file *m, void *v)
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{
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int i;
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struct inode *inode = m->private;
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struct task_struct *task = get_proc_task(inode);
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if (!task)
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return -ESRCH;
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seq_puts(m, "Latency Top version : v0.1\n");
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for (i = 0; i < 32; i++) {
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struct latency_record *lr = &task->latency_record[i];
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if (lr->backtrace[0]) {
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int q;
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seq_printf(m, "%i %li %li",
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lr->count, lr->time, lr->max);
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for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
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unsigned long bt = lr->backtrace[q];
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if (!bt)
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break;
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if (bt == ULONG_MAX)
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break;
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seq_printf(m, " %ps", (void *)bt);
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}
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seq_putc(m, '\n');
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}
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}
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put_task_struct(task);
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return 0;
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}
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static int lstats_open(struct inode *inode, struct file *file)
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{
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return single_open(file, lstats_show_proc, inode);
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}
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static ssize_t lstats_write(struct file *file, const char __user *buf,
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size_t count, loff_t *offs)
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{
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struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
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if (!task)
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return -ESRCH;
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clear_all_latency_tracing(task);
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put_task_struct(task);
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return count;
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}
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static const struct file_operations proc_lstats_operations = {
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.open = lstats_open,
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.read = seq_read,
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.write = lstats_write,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#endif
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static int proc_oom_score(struct task_struct *task, char *buffer)
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{
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unsigned long points = 0;
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read_lock(&tasklist_lock);
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if (pid_alive(task))
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points = oom_badness(task, NULL, NULL,
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totalram_pages + total_swap_pages);
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read_unlock(&tasklist_lock);
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return sprintf(buffer, "%lu\n", points);
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}
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struct limit_names {
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char *name;
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char *unit;
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};
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static const struct limit_names lnames[RLIM_NLIMITS] = {
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[RLIMIT_CPU] = {"Max cpu time", "seconds"},
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[RLIMIT_FSIZE] = {"Max file size", "bytes"},
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[RLIMIT_DATA] = {"Max data size", "bytes"},
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[RLIMIT_STACK] = {"Max stack size", "bytes"},
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[RLIMIT_CORE] = {"Max core file size", "bytes"},
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[RLIMIT_RSS] = {"Max resident set", "bytes"},
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[RLIMIT_NPROC] = {"Max processes", "processes"},
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[RLIMIT_NOFILE] = {"Max open files", "files"},
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[RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
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[RLIMIT_AS] = {"Max address space", "bytes"},
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[RLIMIT_LOCKS] = {"Max file locks", "locks"},
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[RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
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[RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
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[RLIMIT_NICE] = {"Max nice priority", NULL},
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[RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
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[RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
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};
|
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|
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/* Display limits for a process */
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static int proc_pid_limits(struct task_struct *task, char *buffer)
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{
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unsigned int i;
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int count = 0;
|
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unsigned long flags;
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char *bufptr = buffer;
|
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|
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struct rlimit rlim[RLIM_NLIMITS];
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|
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if (!lock_task_sighand(task, &flags))
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return 0;
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memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
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unlock_task_sighand(task, &flags);
|
|
|
|
/*
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* print the file header
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*/
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count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
|
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"Limit", "Soft Limit", "Hard Limit", "Units");
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|
|
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for (i = 0; i < RLIM_NLIMITS; i++) {
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if (rlim[i].rlim_cur == RLIM_INFINITY)
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count += sprintf(&bufptr[count], "%-25s %-20s ",
|
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lnames[i].name, "unlimited");
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|
else
|
|
count += sprintf(&bufptr[count], "%-25s %-20lu ",
|
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lnames[i].name, rlim[i].rlim_cur);
|
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|
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if (rlim[i].rlim_max == RLIM_INFINITY)
|
|
count += sprintf(&bufptr[count], "%-20s ", "unlimited");
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else
|
|
count += sprintf(&bufptr[count], "%-20lu ",
|
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rlim[i].rlim_max);
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|
|
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if (lnames[i].unit)
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count += sprintf(&bufptr[count], "%-10s\n",
|
|
lnames[i].unit);
|
|
else
|
|
count += sprintf(&bufptr[count], "\n");
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
|
|
static int proc_pid_syscall(struct task_struct *task, char *buffer)
|
|
{
|
|
long nr;
|
|
unsigned long args[6], sp, pc;
|
|
int res = lock_trace(task);
|
|
if (res)
|
|
return res;
|
|
|
|
if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
|
|
res = sprintf(buffer, "running\n");
|
|
else if (nr < 0)
|
|
res = sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
|
|
else
|
|
res = sprintf(buffer,
|
|
"%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
|
|
nr,
|
|
args[0], args[1], args[2], args[3], args[4], args[5],
|
|
sp, pc);
|
|
unlock_trace(task);
|
|
return res;
|
|
}
|
|
#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
|
|
|
|
/************************************************************************/
|
|
/* Here the fs part begins */
|
|
/************************************************************************/
|
|
|
|
/* permission checks */
|
|
static int proc_fd_access_allowed(struct inode *inode)
|
|
{
|
|
struct task_struct *task;
|
|
int allowed = 0;
|
|
/* Allow access to a task's file descriptors if it is us or we
|
|
* may use ptrace attach to the process and find out that
|
|
* information.
|
|
*/
|
|
task = get_proc_task(inode);
|
|
if (task) {
|
|
allowed = ptrace_may_access(task, PTRACE_MODE_READ);
|
|
put_task_struct(task);
|
|
}
|
|
return allowed;
|
|
}
|
|
|
|
int proc_setattr(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
int error;
|
|
struct inode *inode = dentry->d_inode;
|
|
|
|
if (attr->ia_valid & ATTR_MODE)
|
|
return -EPERM;
|
|
|
|
error = inode_change_ok(inode, attr);
|
|
if (error)
|
|
return error;
|
|
|
|
if ((attr->ia_valid & ATTR_SIZE) &&
|
|
attr->ia_size != i_size_read(inode)) {
|
|
error = vmtruncate(inode, attr->ia_size);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
setattr_copy(inode, attr);
|
|
mark_inode_dirty(inode);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* May current process learn task's sched/cmdline info (for hide_pid_min=1)
|
|
* or euid/egid (for hide_pid_min=2)?
|
|
*/
|
|
static bool has_pid_permissions(struct pid_namespace *pid,
|
|
struct task_struct *task,
|
|
int hide_pid_min)
|
|
{
|
|
if (pid->hide_pid < hide_pid_min)
|
|
return true;
|
|
if (in_group_p(pid->pid_gid))
|
|
return true;
|
|
return ptrace_may_access(task, PTRACE_MODE_READ);
|
|
}
|
|
|
|
|
|
static int proc_pid_permission(struct inode *inode, int mask)
|
|
{
|
|
struct pid_namespace *pid = inode->i_sb->s_fs_info;
|
|
struct task_struct *task;
|
|
bool has_perms;
|
|
|
|
task = get_proc_task(inode);
|
|
if (!task)
|
|
return -ESRCH;
|
|
has_perms = has_pid_permissions(pid, task, 1);
|
|
put_task_struct(task);
|
|
|
|
if (!has_perms) {
|
|
if (pid->hide_pid == 2) {
|
|
/*
|
|
* Let's make getdents(), stat(), and open()
|
|
* consistent with each other. If a process
|
|
* may not stat() a file, it shouldn't be seen
|
|
* in procfs at all.
|
|
*/
|
|
return -ENOENT;
|
|
}
|
|
|
|
return -EPERM;
|
|
}
|
|
return generic_permission(inode, mask);
|
|
}
|
|
|
|
|
|
|
|
static const struct inode_operations proc_def_inode_operations = {
|
|
.setattr = proc_setattr,
|
|
};
|
|
|
|
#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
|
|
|
|
static ssize_t proc_info_read(struct file * file, char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct inode * inode = file->f_path.dentry->d_inode;
|
|
unsigned long page;
|
|
ssize_t length;
|
|
struct task_struct *task = get_proc_task(inode);
|
|
|
|
length = -ESRCH;
|
|
if (!task)
|
|
goto out_no_task;
|
|
|
|
if (count > PROC_BLOCK_SIZE)
|
|
count = PROC_BLOCK_SIZE;
|
|
|
|
length = -ENOMEM;
|
|
if (!(page = __get_free_page(GFP_TEMPORARY)))
|
|
goto out;
|
|
|
|
length = PROC_I(inode)->op.proc_read(task, (char*)page);
|
|
|
|
if (length >= 0)
|
|
length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
|
|
free_page(page);
|
|
out:
|
|
put_task_struct(task);
|
|
out_no_task:
|
|
return length;
|
|
}
|
|
|
|
static const struct file_operations proc_info_file_operations = {
|
|
.read = proc_info_read,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static int proc_single_show(struct seq_file *m, void *v)
|
|
{
|
|
struct inode *inode = m->private;
|
|
struct pid_namespace *ns;
|
|
struct pid *pid;
|
|
struct task_struct *task;
|
|
int ret;
|
|
|
|
ns = inode->i_sb->s_fs_info;
|
|
pid = proc_pid(inode);
|
|
task = get_pid_task(pid, PIDTYPE_PID);
|
|
if (!task)
|
|
return -ESRCH;
|
|
|
|
ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
|
|
|
|
put_task_struct(task);
|
|
return ret;
|
|
}
|
|
|
|
static int proc_single_open(struct inode *inode, struct file *filp)
|
|
{
|
|
return single_open(filp, proc_single_show, inode);
|
|
}
|
|
|
|
static const struct file_operations proc_single_file_operations = {
|
|
.open = proc_single_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int mem_open(struct inode* inode, struct file* file)
|
|
{
|
|
struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
|
|
struct mm_struct *mm;
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
|
|
mm = mm_access(task, PTRACE_MODE_ATTACH);
|
|
put_task_struct(task);
|
|
|
|
if (IS_ERR(mm))
|
|
return PTR_ERR(mm);
|
|
|
|
if (mm) {
|
|
/* ensure this mm_struct can't be freed */
|
|
atomic_inc(&mm->mm_count);
|
|
/* but do not pin its memory */
|
|
mmput(mm);
|
|
}
|
|
|
|
/* OK to pass negative loff_t, we can catch out-of-range */
|
|
file->f_mode |= FMODE_UNSIGNED_OFFSET;
|
|
file->private_data = mm;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t mem_rw(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos, int write)
|
|
{
|
|
struct mm_struct *mm = file->private_data;
|
|
unsigned long addr = *ppos;
|
|
ssize_t copied;
|
|
char *page;
|
|
|
|
if (!mm)
|
|
return 0;
|
|
|
|
page = (char *)__get_free_page(GFP_TEMPORARY);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
copied = 0;
|
|
if (!atomic_inc_not_zero(&mm->mm_users))
|
|
goto free;
|
|
|
|
while (count > 0) {
|
|
int this_len = min_t(int, count, PAGE_SIZE);
|
|
|
|
if (write && copy_from_user(page, buf, this_len)) {
|
|
copied = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
this_len = access_remote_vm(mm, addr, page, this_len, write);
|
|
if (!this_len) {
|
|
if (!copied)
|
|
copied = -EIO;
|
|
break;
|
|
}
|
|
|
|
if (!write && copy_to_user(buf, page, this_len)) {
|
|
copied = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
buf += this_len;
|
|
addr += this_len;
|
|
copied += this_len;
|
|
count -= this_len;
|
|
}
|
|
*ppos = addr;
|
|
|
|
mmput(mm);
|
|
free:
|
|
free_page((unsigned long) page);
|
|
return copied;
|
|
}
|
|
|
|
static ssize_t mem_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return mem_rw(file, buf, count, ppos, 0);
|
|
}
|
|
|
|
static ssize_t mem_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return mem_rw(file, (char __user*)buf, count, ppos, 1);
|
|
}
|
|
|
|
loff_t mem_lseek(struct file *file, loff_t offset, int orig)
|
|
{
|
|
switch (orig) {
|
|
case 0:
|
|
file->f_pos = offset;
|
|
break;
|
|
case 1:
|
|
file->f_pos += offset;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
force_successful_syscall_return();
|
|
return file->f_pos;
|
|
}
|
|
|
|
static int mem_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct mm_struct *mm = file->private_data;
|
|
if (mm)
|
|
mmdrop(mm);
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations proc_mem_operations = {
|
|
.llseek = mem_lseek,
|
|
.read = mem_read,
|
|
.write = mem_write,
|
|
.open = mem_open,
|
|
.release = mem_release,
|
|
};
|
|
|
|
static ssize_t environ_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
|
|
char *page;
|
|
unsigned long src = *ppos;
|
|
int ret = -ESRCH;
|
|
struct mm_struct *mm;
|
|
|
|
if (!task)
|
|
goto out_no_task;
|
|
|
|
ret = -ENOMEM;
|
|
page = (char *)__get_free_page(GFP_TEMPORARY);
|
|
if (!page)
|
|
goto out;
|
|
|
|
|
|
mm = mm_for_maps(task);
|
|
ret = PTR_ERR(mm);
|
|
if (!mm || IS_ERR(mm))
|
|
goto out_free;
|
|
|
|
ret = 0;
|
|
while (count > 0) {
|
|
int this_len, retval, max_len;
|
|
|
|
this_len = mm->env_end - (mm->env_start + src);
|
|
|
|
if (this_len <= 0)
|
|
break;
|
|
|
|
max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
|
|
this_len = (this_len > max_len) ? max_len : this_len;
|
|
|
|
retval = access_process_vm(task, (mm->env_start + src),
|
|
page, this_len, 0);
|
|
|
|
if (retval <= 0) {
|
|
ret = retval;
|
|
break;
|
|
}
|
|
|
|
if (copy_to_user(buf, page, retval)) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
ret += retval;
|
|
src += retval;
|
|
buf += retval;
|
|
count -= retval;
|
|
}
|
|
*ppos = src;
|
|
|
|
mmput(mm);
|
|
out_free:
|
|
free_page((unsigned long) page);
|
|
out:
|
|
put_task_struct(task);
|
|
out_no_task:
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations proc_environ_operations = {
|
|
.read = environ_read,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t oom_adjust_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
|
|
char buffer[PROC_NUMBUF];
|
|
size_t len;
|
|
int oom_adjust = OOM_DISABLE;
|
|
unsigned long flags;
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
|
|
if (lock_task_sighand(task, &flags)) {
|
|
oom_adjust = task->signal->oom_adj;
|
|
unlock_task_sighand(task, &flags);
|
|
}
|
|
|
|
put_task_struct(task);
|
|
|
|
len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
|
|
|
|
return simple_read_from_buffer(buf, count, ppos, buffer, len);
|
|
}
|
|
|
|
static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task;
|
|
char buffer[PROC_NUMBUF];
|
|
int oom_adjust;
|
|
unsigned long flags;
|
|
int err;
|
|
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if (count > sizeof(buffer) - 1)
|
|
count = sizeof(buffer) - 1;
|
|
if (copy_from_user(buffer, buf, count)) {
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
err = kstrtoint(strstrip(buffer), 0, &oom_adjust);
|
|
if (err)
|
|
goto out;
|
|
if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
|
|
oom_adjust != OOM_DISABLE) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
task = get_proc_task(file->f_path.dentry->d_inode);
|
|
if (!task) {
|
|
err = -ESRCH;
|
|
goto out;
|
|
}
|
|
|
|
task_lock(task);
|
|
if (!task->mm) {
|
|
err = -EINVAL;
|
|
goto err_task_lock;
|
|
}
|
|
|
|
if (!lock_task_sighand(task, &flags)) {
|
|
err = -ESRCH;
|
|
goto err_task_lock;
|
|
}
|
|
|
|
if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
|
|
err = -EACCES;
|
|
goto err_sighand;
|
|
}
|
|
|
|
/*
|
|
* Warn that /proc/pid/oom_adj is deprecated, see
|
|
* Documentation/feature-removal-schedule.txt.
|
|
*/
|
|
printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
|
|
current->comm, task_pid_nr(current), task_pid_nr(task),
|
|
task_pid_nr(task));
|
|
task->signal->oom_adj = oom_adjust;
|
|
/*
|
|
* Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
|
|
* value is always attainable.
|
|
*/
|
|
if (task->signal->oom_adj == OOM_ADJUST_MAX)
|
|
task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
|
|
else
|
|
task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
|
|
-OOM_DISABLE;
|
|
trace_oom_score_adj_update(task);
|
|
err_sighand:
|
|
unlock_task_sighand(task, &flags);
|
|
err_task_lock:
|
|
task_unlock(task);
|
|
put_task_struct(task);
|
|
out:
|
|
return err < 0 ? err : count;
|
|
}
|
|
|
|
static const struct file_operations proc_oom_adjust_operations = {
|
|
.read = oom_adjust_read,
|
|
.write = oom_adjust_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
|
|
char buffer[PROC_NUMBUF];
|
|
int oom_score_adj = OOM_SCORE_ADJ_MIN;
|
|
unsigned long flags;
|
|
size_t len;
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
if (lock_task_sighand(task, &flags)) {
|
|
oom_score_adj = task->signal->oom_score_adj;
|
|
unlock_task_sighand(task, &flags);
|
|
}
|
|
put_task_struct(task);
|
|
len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
|
|
return simple_read_from_buffer(buf, count, ppos, buffer, len);
|
|
}
|
|
|
|
static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task;
|
|
char buffer[PROC_NUMBUF];
|
|
unsigned long flags;
|
|
int oom_score_adj;
|
|
int err;
|
|
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if (count > sizeof(buffer) - 1)
|
|
count = sizeof(buffer) - 1;
|
|
if (copy_from_user(buffer, buf, count)) {
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
|
|
if (err)
|
|
goto out;
|
|
if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
|
|
oom_score_adj > OOM_SCORE_ADJ_MAX) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
task = get_proc_task(file->f_path.dentry->d_inode);
|
|
if (!task) {
|
|
err = -ESRCH;
|
|
goto out;
|
|
}
|
|
|
|
task_lock(task);
|
|
if (!task->mm) {
|
|
err = -EINVAL;
|
|
goto err_task_lock;
|
|
}
|
|
|
|
if (!lock_task_sighand(task, &flags)) {
|
|
err = -ESRCH;
|
|
goto err_task_lock;
|
|
}
|
|
|
|
if (oom_score_adj < task->signal->oom_score_adj_min &&
|
|
!capable(CAP_SYS_RESOURCE)) {
|
|
err = -EACCES;
|
|
goto err_sighand;
|
|
}
|
|
|
|
task->signal->oom_score_adj = oom_score_adj;
|
|
if (has_capability_noaudit(current, CAP_SYS_RESOURCE))
|
|
task->signal->oom_score_adj_min = oom_score_adj;
|
|
trace_oom_score_adj_update(task);
|
|
/*
|
|
* Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
|
|
* always attainable.
|
|
*/
|
|
if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
|
|
task->signal->oom_adj = OOM_DISABLE;
|
|
else
|
|
task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
|
|
OOM_SCORE_ADJ_MAX;
|
|
err_sighand:
|
|
unlock_task_sighand(task, &flags);
|
|
err_task_lock:
|
|
task_unlock(task);
|
|
put_task_struct(task);
|
|
out:
|
|
return err < 0 ? err : count;
|
|
}
|
|
|
|
static const struct file_operations proc_oom_score_adj_operations = {
|
|
.read = oom_score_adj_read,
|
|
.write = oom_score_adj_write,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
#ifdef CONFIG_AUDITSYSCALL
|
|
#define TMPBUFLEN 21
|
|
static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct inode * inode = file->f_path.dentry->d_inode;
|
|
struct task_struct *task = get_proc_task(inode);
|
|
ssize_t length;
|
|
char tmpbuf[TMPBUFLEN];
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
|
|
audit_get_loginuid(task));
|
|
put_task_struct(task);
|
|
return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
|
|
}
|
|
|
|
static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct inode * inode = file->f_path.dentry->d_inode;
|
|
char *page, *tmp;
|
|
ssize_t length;
|
|
uid_t loginuid;
|
|
|
|
rcu_read_lock();
|
|
if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
|
|
rcu_read_unlock();
|
|
return -EPERM;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (count >= PAGE_SIZE)
|
|
count = PAGE_SIZE - 1;
|
|
|
|
if (*ppos != 0) {
|
|
/* No partial writes. */
|
|
return -EINVAL;
|
|
}
|
|
page = (char*)__get_free_page(GFP_TEMPORARY);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
length = -EFAULT;
|
|
if (copy_from_user(page, buf, count))
|
|
goto out_free_page;
|
|
|
|
page[count] = '\0';
|
|
loginuid = simple_strtoul(page, &tmp, 10);
|
|
if (tmp == page) {
|
|
length = -EINVAL;
|
|
goto out_free_page;
|
|
|
|
}
|
|
length = audit_set_loginuid(loginuid);
|
|
if (likely(length == 0))
|
|
length = count;
|
|
|
|
out_free_page:
|
|
free_page((unsigned long) page);
|
|
return length;
|
|
}
|
|
|
|
static const struct file_operations proc_loginuid_operations = {
|
|
.read = proc_loginuid_read,
|
|
.write = proc_loginuid_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct inode * inode = file->f_path.dentry->d_inode;
|
|
struct task_struct *task = get_proc_task(inode);
|
|
ssize_t length;
|
|
char tmpbuf[TMPBUFLEN];
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
|
|
audit_get_sessionid(task));
|
|
put_task_struct(task);
|
|
return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
|
|
}
|
|
|
|
static const struct file_operations proc_sessionid_operations = {
|
|
.read = proc_sessionid_read,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_FAULT_INJECTION
|
|
static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
|
|
char buffer[PROC_NUMBUF];
|
|
size_t len;
|
|
int make_it_fail;
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
make_it_fail = task->make_it_fail;
|
|
put_task_struct(task);
|
|
|
|
len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
|
|
|
|
return simple_read_from_buffer(buf, count, ppos, buffer, len);
|
|
}
|
|
|
|
static ssize_t proc_fault_inject_write(struct file * file,
|
|
const char __user * buf, size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task;
|
|
char buffer[PROC_NUMBUF], *end;
|
|
int make_it_fail;
|
|
|
|
if (!capable(CAP_SYS_RESOURCE))
|
|
return -EPERM;
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if (count > sizeof(buffer) - 1)
|
|
count = sizeof(buffer) - 1;
|
|
if (copy_from_user(buffer, buf, count))
|
|
return -EFAULT;
|
|
make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
|
|
if (*end)
|
|
return -EINVAL;
|
|
task = get_proc_task(file->f_dentry->d_inode);
|
|
if (!task)
|
|
return -ESRCH;
|
|
task->make_it_fail = make_it_fail;
|
|
put_task_struct(task);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations proc_fault_inject_operations = {
|
|
.read = proc_fault_inject_read,
|
|
.write = proc_fault_inject_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
#endif
|
|
|
|
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
/*
|
|
* Print out various scheduling related per-task fields:
|
|
*/
|
|
static int sched_show(struct seq_file *m, void *v)
|
|
{
|
|
struct inode *inode = m->private;
|
|
struct task_struct *p;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
proc_sched_show_task(p, m);
|
|
|
|
put_task_struct(p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t
|
|
sched_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *offset)
|
|
{
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
struct task_struct *p;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
proc_sched_set_task(p);
|
|
|
|
put_task_struct(p);
|
|
|
|
return count;
|
|
}
|
|
|
|
static int sched_open(struct inode *inode, struct file *filp)
|
|
{
|
|
return single_open(filp, sched_show, inode);
|
|
}
|
|
|
|
static const struct file_operations proc_pid_sched_operations = {
|
|
.open = sched_open,
|
|
.read = seq_read,
|
|
.write = sched_write,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_SCHED_AUTOGROUP
|
|
/*
|
|
* Print out autogroup related information:
|
|
*/
|
|
static int sched_autogroup_show(struct seq_file *m, void *v)
|
|
{
|
|
struct inode *inode = m->private;
|
|
struct task_struct *p;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
proc_sched_autogroup_show_task(p, m);
|
|
|
|
put_task_struct(p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t
|
|
sched_autogroup_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *offset)
|
|
{
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
struct task_struct *p;
|
|
char buffer[PROC_NUMBUF];
|
|
int nice;
|
|
int err;
|
|
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if (count > sizeof(buffer) - 1)
|
|
count = sizeof(buffer) - 1;
|
|
if (copy_from_user(buffer, buf, count))
|
|
return -EFAULT;
|
|
|
|
err = kstrtoint(strstrip(buffer), 0, &nice);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
|
|
err = proc_sched_autogroup_set_nice(p, nice);
|
|
if (err)
|
|
count = err;
|
|
|
|
put_task_struct(p);
|
|
|
|
return count;
|
|
}
|
|
|
|
static int sched_autogroup_open(struct inode *inode, struct file *filp)
|
|
{
|
|
int ret;
|
|
|
|
ret = single_open(filp, sched_autogroup_show, NULL);
|
|
if (!ret) {
|
|
struct seq_file *m = filp->private_data;
|
|
|
|
m->private = inode;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations proc_pid_sched_autogroup_operations = {
|
|
.open = sched_autogroup_open,
|
|
.read = seq_read,
|
|
.write = sched_autogroup_write,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
#endif /* CONFIG_SCHED_AUTOGROUP */
|
|
|
|
static ssize_t comm_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *offset)
|
|
{
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
struct task_struct *p;
|
|
char buffer[TASK_COMM_LEN];
|
|
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if (count > sizeof(buffer) - 1)
|
|
count = sizeof(buffer) - 1;
|
|
if (copy_from_user(buffer, buf, count))
|
|
return -EFAULT;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
|
|
if (same_thread_group(current, p))
|
|
set_task_comm(p, buffer);
|
|
else
|
|
count = -EINVAL;
|
|
|
|
put_task_struct(p);
|
|
|
|
return count;
|
|
}
|
|
|
|
static int comm_show(struct seq_file *m, void *v)
|
|
{
|
|
struct inode *inode = m->private;
|
|
struct task_struct *p;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
|
|
task_lock(p);
|
|
seq_printf(m, "%s\n", p->comm);
|
|
task_unlock(p);
|
|
|
|
put_task_struct(p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int comm_open(struct inode *inode, struct file *filp)
|
|
{
|
|
return single_open(filp, comm_show, inode);
|
|
}
|
|
|
|
static const struct file_operations proc_pid_set_comm_operations = {
|
|
.open = comm_open,
|
|
.read = seq_read,
|
|
.write = comm_write,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int proc_exe_link(struct dentry *dentry, struct path *exe_path)
|
|
{
|
|
struct task_struct *task;
|
|
struct mm_struct *mm;
|
|
struct file *exe_file;
|
|
|
|
task = get_proc_task(dentry->d_inode);
|
|
if (!task)
|
|
return -ENOENT;
|
|
mm = get_task_mm(task);
|
|
put_task_struct(task);
|
|
if (!mm)
|
|
return -ENOENT;
|
|
exe_file = get_mm_exe_file(mm);
|
|
mmput(mm);
|
|
if (exe_file) {
|
|
*exe_path = exe_file->f_path;
|
|
path_get(&exe_file->f_path);
|
|
fput(exe_file);
|
|
return 0;
|
|
} else
|
|
return -ENOENT;
|
|
}
|
|
|
|
static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
int error = -EACCES;
|
|
|
|
/* We don't need a base pointer in the /proc filesystem */
|
|
path_put(&nd->path);
|
|
|
|
/* Are we allowed to snoop on the tasks file descriptors? */
|
|
if (!proc_fd_access_allowed(inode))
|
|
goto out;
|
|
|
|
error = PROC_I(inode)->op.proc_get_link(dentry, &nd->path);
|
|
out:
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
|
|
{
|
|
char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
|
|
char *pathname;
|
|
int len;
|
|
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
|
|
pathname = d_path(path, tmp, PAGE_SIZE);
|
|
len = PTR_ERR(pathname);
|
|
if (IS_ERR(pathname))
|
|
goto out;
|
|
len = tmp + PAGE_SIZE - 1 - pathname;
|
|
|
|
if (len > buflen)
|
|
len = buflen;
|
|
if (copy_to_user(buffer, pathname, len))
|
|
len = -EFAULT;
|
|
out:
|
|
free_page((unsigned long)tmp);
|
|
return len;
|
|
}
|
|
|
|
static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
|
|
{
|
|
int error = -EACCES;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct path path;
|
|
|
|
/* Are we allowed to snoop on the tasks file descriptors? */
|
|
if (!proc_fd_access_allowed(inode))
|
|
goto out;
|
|
|
|
error = PROC_I(inode)->op.proc_get_link(dentry, &path);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = do_proc_readlink(&path, buffer, buflen);
|
|
path_put(&path);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static const struct inode_operations proc_pid_link_inode_operations = {
|
|
.readlink = proc_pid_readlink,
|
|
.follow_link = proc_pid_follow_link,
|
|
.setattr = proc_setattr,
|
|
};
|
|
|
|
|
|
/* building an inode */
|
|
|
|
static int task_dumpable(struct task_struct *task)
|
|
{
|
|
int dumpable = 0;
|
|
struct mm_struct *mm;
|
|
|
|
task_lock(task);
|
|
mm = task->mm;
|
|
if (mm)
|
|
dumpable = get_dumpable(mm);
|
|
task_unlock(task);
|
|
if(dumpable == 1)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
|
|
{
|
|
struct inode * inode;
|
|
struct proc_inode *ei;
|
|
const struct cred *cred;
|
|
|
|
/* We need a new inode */
|
|
|
|
inode = new_inode(sb);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
/* Common stuff */
|
|
ei = PROC_I(inode);
|
|
inode->i_ino = get_next_ino();
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
|
|
inode->i_op = &proc_def_inode_operations;
|
|
|
|
/*
|
|
* grab the reference to task.
|
|
*/
|
|
ei->pid = get_task_pid(task, PIDTYPE_PID);
|
|
if (!ei->pid)
|
|
goto out_unlock;
|
|
|
|
if (task_dumpable(task)) {
|
|
rcu_read_lock();
|
|
cred = __task_cred(task);
|
|
inode->i_uid = cred->euid;
|
|
inode->i_gid = cred->egid;
|
|
rcu_read_unlock();
|
|
}
|
|
security_task_to_inode(task, inode);
|
|
|
|
out:
|
|
return inode;
|
|
|
|
out_unlock:
|
|
iput(inode);
|
|
return NULL;
|
|
}
|
|
|
|
int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct task_struct *task;
|
|
const struct cred *cred;
|
|
struct pid_namespace *pid = dentry->d_sb->s_fs_info;
|
|
|
|
generic_fillattr(inode, stat);
|
|
|
|
rcu_read_lock();
|
|
stat->uid = 0;
|
|
stat->gid = 0;
|
|
task = pid_task(proc_pid(inode), PIDTYPE_PID);
|
|
if (task) {
|
|
if (!has_pid_permissions(pid, task, 2)) {
|
|
rcu_read_unlock();
|
|
/*
|
|
* This doesn't prevent learning whether PID exists,
|
|
* it only makes getattr() consistent with readdir().
|
|
*/
|
|
return -ENOENT;
|
|
}
|
|
if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
|
|
task_dumpable(task)) {
|
|
cred = __task_cred(task);
|
|
stat->uid = cred->euid;
|
|
stat->gid = cred->egid;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
|
|
/* dentry stuff */
|
|
|
|
/*
|
|
* Exceptional case: normally we are not allowed to unhash a busy
|
|
* directory. In this case, however, we can do it - no aliasing problems
|
|
* due to the way we treat inodes.
|
|
*
|
|
* Rewrite the inode's ownerships here because the owning task may have
|
|
* performed a setuid(), etc.
|
|
*
|
|
* Before the /proc/pid/status file was created the only way to read
|
|
* the effective uid of a /process was to stat /proc/pid. Reading
|
|
* /proc/pid/status is slow enough that procps and other packages
|
|
* kept stating /proc/pid. To keep the rules in /proc simple I have
|
|
* made this apply to all per process world readable and executable
|
|
* directories.
|
|
*/
|
|
int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
struct inode *inode;
|
|
struct task_struct *task;
|
|
const struct cred *cred;
|
|
|
|
if (nd && nd->flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
inode = dentry->d_inode;
|
|
task = get_proc_task(inode);
|
|
|
|
if (task) {
|
|
if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
|
|
task_dumpable(task)) {
|
|
rcu_read_lock();
|
|
cred = __task_cred(task);
|
|
inode->i_uid = cred->euid;
|
|
inode->i_gid = cred->egid;
|
|
rcu_read_unlock();
|
|
} else {
|
|
inode->i_uid = 0;
|
|
inode->i_gid = 0;
|
|
}
|
|
inode->i_mode &= ~(S_ISUID | S_ISGID);
|
|
security_task_to_inode(task, inode);
|
|
put_task_struct(task);
|
|
return 1;
|
|
}
|
|
d_drop(dentry);
|
|
return 0;
|
|
}
|
|
|
|
static int pid_delete_dentry(const struct dentry * dentry)
|
|
{
|
|
/* Is the task we represent dead?
|
|
* If so, then don't put the dentry on the lru list,
|
|
* kill it immediately.
|
|
*/
|
|
return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
|
|
}
|
|
|
|
const struct dentry_operations pid_dentry_operations =
|
|
{
|
|
.d_revalidate = pid_revalidate,
|
|
.d_delete = pid_delete_dentry,
|
|
};
|
|
|
|
/* Lookups */
|
|
|
|
/*
|
|
* Fill a directory entry.
|
|
*
|
|
* If possible create the dcache entry and derive our inode number and
|
|
* file type from dcache entry.
|
|
*
|
|
* Since all of the proc inode numbers are dynamically generated, the inode
|
|
* numbers do not exist until the inode is cache. This means creating the
|
|
* the dcache entry in readdir is necessary to keep the inode numbers
|
|
* reported by readdir in sync with the inode numbers reported
|
|
* by stat.
|
|
*/
|
|
int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
|
|
const char *name, int len,
|
|
instantiate_t instantiate, struct task_struct *task, const void *ptr)
|
|
{
|
|
struct dentry *child, *dir = filp->f_path.dentry;
|
|
struct inode *inode;
|
|
struct qstr qname;
|
|
ino_t ino = 0;
|
|
unsigned type = DT_UNKNOWN;
|
|
|
|
qname.name = name;
|
|
qname.len = len;
|
|
qname.hash = full_name_hash(name, len);
|
|
|
|
child = d_lookup(dir, &qname);
|
|
if (!child) {
|
|
struct dentry *new;
|
|
new = d_alloc(dir, &qname);
|
|
if (new) {
|
|
child = instantiate(dir->d_inode, new, task, ptr);
|
|
if (child)
|
|
dput(new);
|
|
else
|
|
child = new;
|
|
}
|
|
}
|
|
if (!child || IS_ERR(child) || !child->d_inode)
|
|
goto end_instantiate;
|
|
inode = child->d_inode;
|
|
if (inode) {
|
|
ino = inode->i_ino;
|
|
type = inode->i_mode >> 12;
|
|
}
|
|
dput(child);
|
|
end_instantiate:
|
|
if (!ino)
|
|
ino = find_inode_number(dir, &qname);
|
|
if (!ino)
|
|
ino = 1;
|
|
return filldir(dirent, name, len, filp->f_pos, ino, type);
|
|
}
|
|
|
|
static unsigned name_to_int(struct dentry *dentry)
|
|
{
|
|
const char *name = dentry->d_name.name;
|
|
int len = dentry->d_name.len;
|
|
unsigned n = 0;
|
|
|
|
if (len > 1 && *name == '0')
|
|
goto out;
|
|
while (len-- > 0) {
|
|
unsigned c = *name++ - '0';
|
|
if (c > 9)
|
|
goto out;
|
|
if (n >= (~0U-9)/10)
|
|
goto out;
|
|
n *= 10;
|
|
n += c;
|
|
}
|
|
return n;
|
|
out:
|
|
return ~0U;
|
|
}
|
|
|
|
#define PROC_FDINFO_MAX 64
|
|
|
|
static int proc_fd_info(struct inode *inode, struct path *path, char *info)
|
|
{
|
|
struct task_struct *task = get_proc_task(inode);
|
|
struct files_struct *files = NULL;
|
|
struct file *file;
|
|
int fd = proc_fd(inode);
|
|
|
|
if (task) {
|
|
files = get_files_struct(task);
|
|
put_task_struct(task);
|
|
}
|
|
if (files) {
|
|
/*
|
|
* We are not taking a ref to the file structure, so we must
|
|
* hold ->file_lock.
|
|
*/
|
|
spin_lock(&files->file_lock);
|
|
file = fcheck_files(files, fd);
|
|
if (file) {
|
|
unsigned int f_flags;
|
|
struct fdtable *fdt;
|
|
|
|
fdt = files_fdtable(files);
|
|
f_flags = file->f_flags & ~O_CLOEXEC;
|
|
if (close_on_exec(fd, fdt))
|
|
f_flags |= O_CLOEXEC;
|
|
|
|
if (path) {
|
|
*path = file->f_path;
|
|
path_get(&file->f_path);
|
|
}
|
|
if (info)
|
|
snprintf(info, PROC_FDINFO_MAX,
|
|
"pos:\t%lli\n"
|
|
"flags:\t0%o\n",
|
|
(long long) file->f_pos,
|
|
f_flags);
|
|
spin_unlock(&files->file_lock);
|
|
put_files_struct(files);
|
|
return 0;
|
|
}
|
|
spin_unlock(&files->file_lock);
|
|
put_files_struct(files);
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int proc_fd_link(struct dentry *dentry, struct path *path)
|
|
{
|
|
return proc_fd_info(dentry->d_inode, path, NULL);
|
|
}
|
|
|
|
static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
struct inode *inode;
|
|
struct task_struct *task;
|
|
int fd;
|
|
struct files_struct *files;
|
|
const struct cred *cred;
|
|
|
|
if (nd && nd->flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
inode = dentry->d_inode;
|
|
task = get_proc_task(inode);
|
|
fd = proc_fd(inode);
|
|
|
|
if (task) {
|
|
files = get_files_struct(task);
|
|
if (files) {
|
|
rcu_read_lock();
|
|
if (fcheck_files(files, fd)) {
|
|
rcu_read_unlock();
|
|
put_files_struct(files);
|
|
if (task_dumpable(task)) {
|
|
rcu_read_lock();
|
|
cred = __task_cred(task);
|
|
inode->i_uid = cred->euid;
|
|
inode->i_gid = cred->egid;
|
|
rcu_read_unlock();
|
|
} else {
|
|
inode->i_uid = 0;
|
|
inode->i_gid = 0;
|
|
}
|
|
inode->i_mode &= ~(S_ISUID | S_ISGID);
|
|
security_task_to_inode(task, inode);
|
|
put_task_struct(task);
|
|
return 1;
|
|
}
|
|
rcu_read_unlock();
|
|
put_files_struct(files);
|
|
}
|
|
put_task_struct(task);
|
|
}
|
|
d_drop(dentry);
|
|
return 0;
|
|
}
|
|
|
|
static const struct dentry_operations tid_fd_dentry_operations =
|
|
{
|
|
.d_revalidate = tid_fd_revalidate,
|
|
.d_delete = pid_delete_dentry,
|
|
};
|
|
|
|
static struct dentry *proc_fd_instantiate(struct inode *dir,
|
|
struct dentry *dentry, struct task_struct *task, const void *ptr)
|
|
{
|
|
unsigned fd = *(const unsigned *)ptr;
|
|
struct file *file;
|
|
struct files_struct *files;
|
|
struct inode *inode;
|
|
struct proc_inode *ei;
|
|
struct dentry *error = ERR_PTR(-ENOENT);
|
|
|
|
inode = proc_pid_make_inode(dir->i_sb, task);
|
|
if (!inode)
|
|
goto out;
|
|
ei = PROC_I(inode);
|
|
ei->fd = fd;
|
|
files = get_files_struct(task);
|
|
if (!files)
|
|
goto out_iput;
|
|
inode->i_mode = S_IFLNK;
|
|
|
|
/*
|
|
* We are not taking a ref to the file structure, so we must
|
|
* hold ->file_lock.
|
|
*/
|
|
spin_lock(&files->file_lock);
|
|
file = fcheck_files(files, fd);
|
|
if (!file)
|
|
goto out_unlock;
|
|
if (file->f_mode & FMODE_READ)
|
|
inode->i_mode |= S_IRUSR | S_IXUSR;
|
|
if (file->f_mode & FMODE_WRITE)
|
|
inode->i_mode |= S_IWUSR | S_IXUSR;
|
|
spin_unlock(&files->file_lock);
|
|
put_files_struct(files);
|
|
|
|
inode->i_op = &proc_pid_link_inode_operations;
|
|
inode->i_size = 64;
|
|
ei->op.proc_get_link = proc_fd_link;
|
|
d_set_d_op(dentry, &tid_fd_dentry_operations);
|
|
d_add(dentry, inode);
|
|
/* Close the race of the process dying before we return the dentry */
|
|
if (tid_fd_revalidate(dentry, NULL))
|
|
error = NULL;
|
|
|
|
out:
|
|
return error;
|
|
out_unlock:
|
|
spin_unlock(&files->file_lock);
|
|
put_files_struct(files);
|
|
out_iput:
|
|
iput(inode);
|
|
goto out;
|
|
}
|
|
|
|
static struct dentry *proc_lookupfd_common(struct inode *dir,
|
|
struct dentry *dentry,
|
|
instantiate_t instantiate)
|
|
{
|
|
struct task_struct *task = get_proc_task(dir);
|
|
unsigned fd = name_to_int(dentry);
|
|
struct dentry *result = ERR_PTR(-ENOENT);
|
|
|
|
if (!task)
|
|
goto out_no_task;
|
|
if (fd == ~0U)
|
|
goto out;
|
|
|
|
result = instantiate(dir, dentry, task, &fd);
|
|
out:
|
|
put_task_struct(task);
|
|
out_no_task:
|
|
return result;
|
|
}
|
|
|
|
static int proc_readfd_common(struct file * filp, void * dirent,
|
|
filldir_t filldir, instantiate_t instantiate)
|
|
{
|
|
struct dentry *dentry = filp->f_path.dentry;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct task_struct *p = get_proc_task(inode);
|
|
unsigned int fd, ino;
|
|
int retval;
|
|
struct files_struct * files;
|
|
|
|
retval = -ENOENT;
|
|
if (!p)
|
|
goto out_no_task;
|
|
retval = 0;
|
|
|
|
fd = filp->f_pos;
|
|
switch (fd) {
|
|
case 0:
|
|
if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
|
|
goto out;
|
|
filp->f_pos++;
|
|
case 1:
|
|
ino = parent_ino(dentry);
|
|
if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
|
|
goto out;
|
|
filp->f_pos++;
|
|
default:
|
|
files = get_files_struct(p);
|
|
if (!files)
|
|
goto out;
|
|
rcu_read_lock();
|
|
for (fd = filp->f_pos-2;
|
|
fd < files_fdtable(files)->max_fds;
|
|
fd++, filp->f_pos++) {
|
|
char name[PROC_NUMBUF];
|
|
int len;
|
|
|
|
if (!fcheck_files(files, fd))
|
|
continue;
|
|
rcu_read_unlock();
|
|
|
|
len = snprintf(name, sizeof(name), "%d", fd);
|
|
if (proc_fill_cache(filp, dirent, filldir,
|
|
name, len, instantiate,
|
|
p, &fd) < 0) {
|
|
rcu_read_lock();
|
|
break;
|
|
}
|
|
rcu_read_lock();
|
|
}
|
|
rcu_read_unlock();
|
|
put_files_struct(files);
|
|
}
|
|
out:
|
|
put_task_struct(p);
|
|
out_no_task:
|
|
return retval;
|
|
}
|
|
|
|
static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
|
|
struct nameidata *nd)
|
|
{
|
|
return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
|
|
}
|
|
|
|
static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
|
|
{
|
|
return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
|
|
}
|
|
|
|
static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
char tmp[PROC_FDINFO_MAX];
|
|
int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
|
|
if (!err)
|
|
err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
|
|
return err;
|
|
}
|
|
|
|
static const struct file_operations proc_fdinfo_file_operations = {
|
|
.open = nonseekable_open,
|
|
.read = proc_fdinfo_read,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static const struct file_operations proc_fd_operations = {
|
|
.read = generic_read_dir,
|
|
.readdir = proc_readfd,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
#ifdef CONFIG_CHECKPOINT_RESTORE
|
|
|
|
/*
|
|
* dname_to_vma_addr - maps a dentry name into two unsigned longs
|
|
* which represent vma start and end addresses.
|
|
*/
|
|
static int dname_to_vma_addr(struct dentry *dentry,
|
|
unsigned long *start, unsigned long *end)
|
|
{
|
|
if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int map_files_d_revalidate(struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
unsigned long vm_start, vm_end;
|
|
bool exact_vma_exists = false;
|
|
struct mm_struct *mm = NULL;
|
|
struct task_struct *task;
|
|
const struct cred *cred;
|
|
struct inode *inode;
|
|
int status = 0;
|
|
|
|
if (nd && nd->flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
|
status = -EACCES;
|
|
goto out_notask;
|
|
}
|
|
|
|
inode = dentry->d_inode;
|
|
task = get_proc_task(inode);
|
|
if (!task)
|
|
goto out_notask;
|
|
|
|
if (!ptrace_may_access(task, PTRACE_MODE_READ))
|
|
goto out;
|
|
|
|
mm = get_task_mm(task);
|
|
if (!mm)
|
|
goto out;
|
|
|
|
if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) {
|
|
down_read(&mm->mmap_sem);
|
|
exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end);
|
|
up_read(&mm->mmap_sem);
|
|
}
|
|
|
|
mmput(mm);
|
|
|
|
if (exact_vma_exists) {
|
|
if (task_dumpable(task)) {
|
|
rcu_read_lock();
|
|
cred = __task_cred(task);
|
|
inode->i_uid = cred->euid;
|
|
inode->i_gid = cred->egid;
|
|
rcu_read_unlock();
|
|
} else {
|
|
inode->i_uid = 0;
|
|
inode->i_gid = 0;
|
|
}
|
|
security_task_to_inode(task, inode);
|
|
status = 1;
|
|
}
|
|
|
|
out:
|
|
put_task_struct(task);
|
|
|
|
out_notask:
|
|
if (status <= 0)
|
|
d_drop(dentry);
|
|
|
|
return status;
|
|
}
|
|
|
|
static const struct dentry_operations tid_map_files_dentry_operations = {
|
|
.d_revalidate = map_files_d_revalidate,
|
|
.d_delete = pid_delete_dentry,
|
|
};
|
|
|
|
static int proc_map_files_get_link(struct dentry *dentry, struct path *path)
|
|
{
|
|
unsigned long vm_start, vm_end;
|
|
struct vm_area_struct *vma;
|
|
struct task_struct *task;
|
|
struct mm_struct *mm;
|
|
int rc;
|
|
|
|
rc = -ENOENT;
|
|
task = get_proc_task(dentry->d_inode);
|
|
if (!task)
|
|
goto out;
|
|
|
|
mm = get_task_mm(task);
|
|
put_task_struct(task);
|
|
if (!mm)
|
|
goto out;
|
|
|
|
rc = dname_to_vma_addr(dentry, &vm_start, &vm_end);
|
|
if (rc)
|
|
goto out_mmput;
|
|
|
|
down_read(&mm->mmap_sem);
|
|
vma = find_exact_vma(mm, vm_start, vm_end);
|
|
if (vma && vma->vm_file) {
|
|
*path = vma->vm_file->f_path;
|
|
path_get(path);
|
|
rc = 0;
|
|
}
|
|
up_read(&mm->mmap_sem);
|
|
|
|
out_mmput:
|
|
mmput(mm);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
struct map_files_info {
|
|
struct file *file;
|
|
unsigned long len;
|
|
unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
|
|
};
|
|
|
|
static struct dentry *
|
|
proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
|
|
struct task_struct *task, const void *ptr)
|
|
{
|
|
const struct file *file = ptr;
|
|
struct proc_inode *ei;
|
|
struct inode *inode;
|
|
|
|
if (!file)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
inode = proc_pid_make_inode(dir->i_sb, task);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
ei = PROC_I(inode);
|
|
ei->op.proc_get_link = proc_map_files_get_link;
|
|
|
|
inode->i_op = &proc_pid_link_inode_operations;
|
|
inode->i_size = 64;
|
|
inode->i_mode = S_IFLNK;
|
|
|
|
if (file->f_mode & FMODE_READ)
|
|
inode->i_mode |= S_IRUSR;
|
|
if (file->f_mode & FMODE_WRITE)
|
|
inode->i_mode |= S_IWUSR;
|
|
|
|
d_set_d_op(dentry, &tid_map_files_dentry_operations);
|
|
d_add(dentry, inode);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct dentry *proc_map_files_lookup(struct inode *dir,
|
|
struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
unsigned long vm_start, vm_end;
|
|
struct vm_area_struct *vma;
|
|
struct task_struct *task;
|
|
struct dentry *result;
|
|
struct mm_struct *mm;
|
|
|
|
result = ERR_PTR(-EACCES);
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
goto out;
|
|
|
|
result = ERR_PTR(-ENOENT);
|
|
task = get_proc_task(dir);
|
|
if (!task)
|
|
goto out;
|
|
|
|
result = ERR_PTR(-EACCES);
|
|
if (lock_trace(task))
|
|
goto out_put_task;
|
|
|
|
result = ERR_PTR(-ENOENT);
|
|
if (dname_to_vma_addr(dentry, &vm_start, &vm_end))
|
|
goto out_unlock;
|
|
|
|
mm = get_task_mm(task);
|
|
if (!mm)
|
|
goto out_unlock;
|
|
|
|
down_read(&mm->mmap_sem);
|
|
vma = find_exact_vma(mm, vm_start, vm_end);
|
|
if (!vma)
|
|
goto out_no_vma;
|
|
|
|
result = proc_map_files_instantiate(dir, dentry, task, vma->vm_file);
|
|
|
|
out_no_vma:
|
|
up_read(&mm->mmap_sem);
|
|
mmput(mm);
|
|
out_unlock:
|
|
unlock_trace(task);
|
|
out_put_task:
|
|
put_task_struct(task);
|
|
out:
|
|
return result;
|
|
}
|
|
|
|
static const struct inode_operations proc_map_files_inode_operations = {
|
|
.lookup = proc_map_files_lookup,
|
|
.permission = proc_fd_permission,
|
|
.setattr = proc_setattr,
|
|
};
|
|
|
|
static int
|
|
proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
|
{
|
|
struct dentry *dentry = filp->f_path.dentry;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct vm_area_struct *vma;
|
|
struct task_struct *task;
|
|
struct mm_struct *mm;
|
|
ino_t ino;
|
|
int ret;
|
|
|
|
ret = -EACCES;
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
goto out;
|
|
|
|
ret = -ENOENT;
|
|
task = get_proc_task(inode);
|
|
if (!task)
|
|
goto out;
|
|
|
|
ret = -EACCES;
|
|
if (lock_trace(task))
|
|
goto out_put_task;
|
|
|
|
ret = 0;
|
|
switch (filp->f_pos) {
|
|
case 0:
|
|
ino = inode->i_ino;
|
|
if (filldir(dirent, ".", 1, 0, ino, DT_DIR) < 0)
|
|
goto out_unlock;
|
|
filp->f_pos++;
|
|
case 1:
|
|
ino = parent_ino(dentry);
|
|
if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
|
|
goto out_unlock;
|
|
filp->f_pos++;
|
|
default:
|
|
{
|
|
unsigned long nr_files, pos, i;
|
|
struct flex_array *fa = NULL;
|
|
struct map_files_info info;
|
|
struct map_files_info *p;
|
|
|
|
mm = get_task_mm(task);
|
|
if (!mm)
|
|
goto out_unlock;
|
|
down_read(&mm->mmap_sem);
|
|
|
|
nr_files = 0;
|
|
|
|
/*
|
|
* We need two passes here:
|
|
*
|
|
* 1) Collect vmas of mapped files with mmap_sem taken
|
|
* 2) Release mmap_sem and instantiate entries
|
|
*
|
|
* otherwise we get lockdep complained, since filldir()
|
|
* routine might require mmap_sem taken in might_fault().
|
|
*/
|
|
|
|
for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) {
|
|
if (vma->vm_file && ++pos > filp->f_pos)
|
|
nr_files++;
|
|
}
|
|
|
|
if (nr_files) {
|
|
fa = flex_array_alloc(sizeof(info), nr_files,
|
|
GFP_KERNEL);
|
|
if (!fa || flex_array_prealloc(fa, 0, nr_files,
|
|
GFP_KERNEL)) {
|
|
ret = -ENOMEM;
|
|
if (fa)
|
|
flex_array_free(fa);
|
|
up_read(&mm->mmap_sem);
|
|
mmput(mm);
|
|
goto out_unlock;
|
|
}
|
|
for (i = 0, vma = mm->mmap, pos = 2; vma;
|
|
vma = vma->vm_next) {
|
|
if (!vma->vm_file)
|
|
continue;
|
|
if (++pos <= filp->f_pos)
|
|
continue;
|
|
|
|
get_file(vma->vm_file);
|
|
info.file = vma->vm_file;
|
|
info.len = snprintf(info.name,
|
|
sizeof(info.name), "%lx-%lx",
|
|
vma->vm_start, vma->vm_end);
|
|
if (flex_array_put(fa, i++, &info, GFP_KERNEL))
|
|
BUG();
|
|
}
|
|
}
|
|
up_read(&mm->mmap_sem);
|
|
|
|
for (i = 0; i < nr_files; i++) {
|
|
p = flex_array_get(fa, i);
|
|
ret = proc_fill_cache(filp, dirent, filldir,
|
|
p->name, p->len,
|
|
proc_map_files_instantiate,
|
|
task, p->file);
|
|
if (ret)
|
|
break;
|
|
filp->f_pos++;
|
|
fput(p->file);
|
|
}
|
|
for (; i < nr_files; i++) {
|
|
/*
|
|
* In case of error don't forget
|
|
* to put rest of file refs.
|
|
*/
|
|
p = flex_array_get(fa, i);
|
|
fput(p->file);
|
|
}
|
|
if (fa)
|
|
flex_array_free(fa);
|
|
mmput(mm);
|
|
}
|
|
}
|
|
|
|
out_unlock:
|
|
unlock_trace(task);
|
|
out_put_task:
|
|
put_task_struct(task);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations proc_map_files_operations = {
|
|
.read = generic_read_dir,
|
|
.readdir = proc_map_files_readdir,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
#endif /* CONFIG_CHECKPOINT_RESTORE */
|
|
|
|
/*
|
|
* /proc/pid/fd needs a special permission handler so that a process can still
|
|
* access /proc/self/fd after it has executed a setuid().
|
|
*/
|
|
static int proc_fd_permission(struct inode *inode, int mask)
|
|
{
|
|
int rv = generic_permission(inode, mask);
|
|
if (rv == 0)
|
|
return 0;
|
|
if (task_pid(current) == proc_pid(inode))
|
|
rv = 0;
|
|
return rv;
|
|
}
|
|
|
|
/*
|
|
* proc directories can do almost nothing..
|
|
*/
|
|
static const struct inode_operations proc_fd_inode_operations = {
|
|
.lookup = proc_lookupfd,
|
|
.permission = proc_fd_permission,
|
|
.setattr = proc_setattr,
|
|
};
|
|
|
|
static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
|
|
struct dentry *dentry, struct task_struct *task, const void *ptr)
|
|
{
|
|
unsigned fd = *(unsigned *)ptr;
|
|
struct inode *inode;
|
|
struct proc_inode *ei;
|
|
struct dentry *error = ERR_PTR(-ENOENT);
|
|
|
|
inode = proc_pid_make_inode(dir->i_sb, task);
|
|
if (!inode)
|
|
goto out;
|
|
ei = PROC_I(inode);
|
|
ei->fd = fd;
|
|
inode->i_mode = S_IFREG | S_IRUSR;
|
|
inode->i_fop = &proc_fdinfo_file_operations;
|
|
d_set_d_op(dentry, &tid_fd_dentry_operations);
|
|
d_add(dentry, inode);
|
|
/* Close the race of the process dying before we return the dentry */
|
|
if (tid_fd_revalidate(dentry, NULL))
|
|
error = NULL;
|
|
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static struct dentry *proc_lookupfdinfo(struct inode *dir,
|
|
struct dentry *dentry,
|
|
struct nameidata *nd)
|
|
{
|
|
return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
|
|
}
|
|
|
|
static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
|
|
{
|
|
return proc_readfd_common(filp, dirent, filldir,
|
|
proc_fdinfo_instantiate);
|
|
}
|
|
|
|
static const struct file_operations proc_fdinfo_operations = {
|
|
.read = generic_read_dir,
|
|
.readdir = proc_readfdinfo,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/*
|
|
* proc directories can do almost nothing..
|
|
*/
|
|
static const struct inode_operations proc_fdinfo_inode_operations = {
|
|
.lookup = proc_lookupfdinfo,
|
|
.setattr = proc_setattr,
|
|
};
|
|
|
|
|
|
static struct dentry *proc_pident_instantiate(struct inode *dir,
|
|
struct dentry *dentry, struct task_struct *task, const void *ptr)
|
|
{
|
|
const struct pid_entry *p = ptr;
|
|
struct inode *inode;
|
|
struct proc_inode *ei;
|
|
struct dentry *error = ERR_PTR(-ENOENT);
|
|
|
|
inode = proc_pid_make_inode(dir->i_sb, task);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
ei = PROC_I(inode);
|
|
inode->i_mode = p->mode;
|
|
if (S_ISDIR(inode->i_mode))
|
|
set_nlink(inode, 2); /* Use getattr to fix if necessary */
|
|
if (p->iop)
|
|
inode->i_op = p->iop;
|
|
if (p->fop)
|
|
inode->i_fop = p->fop;
|
|
ei->op = p->op;
|
|
d_set_d_op(dentry, &pid_dentry_operations);
|
|
d_add(dentry, inode);
|
|
/* Close the race of the process dying before we return the dentry */
|
|
if (pid_revalidate(dentry, NULL))
|
|
error = NULL;
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static struct dentry *proc_pident_lookup(struct inode *dir,
|
|
struct dentry *dentry,
|
|
const struct pid_entry *ents,
|
|
unsigned int nents)
|
|
{
|
|
struct dentry *error;
|
|
struct task_struct *task = get_proc_task(dir);
|
|
const struct pid_entry *p, *last;
|
|
|
|
error = ERR_PTR(-ENOENT);
|
|
|
|
if (!task)
|
|
goto out_no_task;
|
|
|
|
/*
|
|
* Yes, it does not scale. And it should not. Don't add
|
|
* new entries into /proc/<tgid>/ without very good reasons.
|
|
*/
|
|
last = &ents[nents - 1];
|
|
for (p = ents; p <= last; p++) {
|
|
if (p->len != dentry->d_name.len)
|
|
continue;
|
|
if (!memcmp(dentry->d_name.name, p->name, p->len))
|
|
break;
|
|
}
|
|
if (p > last)
|
|
goto out;
|
|
|
|
error = proc_pident_instantiate(dir, dentry, task, p);
|
|
out:
|
|
put_task_struct(task);
|
|
out_no_task:
|
|
return error;
|
|
}
|
|
|
|
static int proc_pident_fill_cache(struct file *filp, void *dirent,
|
|
filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
|
|
{
|
|
return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
|
|
proc_pident_instantiate, task, p);
|
|
}
|
|
|
|
static int proc_pident_readdir(struct file *filp,
|
|
void *dirent, filldir_t filldir,
|
|
const struct pid_entry *ents, unsigned int nents)
|
|
{
|
|
int i;
|
|
struct dentry *dentry = filp->f_path.dentry;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct task_struct *task = get_proc_task(inode);
|
|
const struct pid_entry *p, *last;
|
|
ino_t ino;
|
|
int ret;
|
|
|
|
ret = -ENOENT;
|
|
if (!task)
|
|
goto out_no_task;
|
|
|
|
ret = 0;
|
|
i = filp->f_pos;
|
|
switch (i) {
|
|
case 0:
|
|
ino = inode->i_ino;
|
|
if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
|
|
goto out;
|
|
i++;
|
|
filp->f_pos++;
|
|
/* fall through */
|
|
case 1:
|
|
ino = parent_ino(dentry);
|
|
if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
|
|
goto out;
|
|
i++;
|
|
filp->f_pos++;
|
|
/* fall through */
|
|
default:
|
|
i -= 2;
|
|
if (i >= nents) {
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
p = ents + i;
|
|
last = &ents[nents - 1];
|
|
while (p <= last) {
|
|
if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
|
|
goto out;
|
|
filp->f_pos++;
|
|
p++;
|
|
}
|
|
}
|
|
|
|
ret = 1;
|
|
out:
|
|
put_task_struct(task);
|
|
out_no_task:
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_SECURITY
|
|
static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct inode * inode = file->f_path.dentry->d_inode;
|
|
char *p = NULL;
|
|
ssize_t length;
|
|
struct task_struct *task = get_proc_task(inode);
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
|
|
length = security_getprocattr(task,
|
|
(char*)file->f_path.dentry->d_name.name,
|
|
&p);
|
|
put_task_struct(task);
|
|
if (length > 0)
|
|
length = simple_read_from_buffer(buf, count, ppos, p, length);
|
|
kfree(p);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct inode * inode = file->f_path.dentry->d_inode;
|
|
char *page;
|
|
ssize_t length;
|
|
struct task_struct *task = get_proc_task(inode);
|
|
|
|
length = -ESRCH;
|
|
if (!task)
|
|
goto out_no_task;
|
|
if (count > PAGE_SIZE)
|
|
count = PAGE_SIZE;
|
|
|
|
/* No partial writes. */
|
|
length = -EINVAL;
|
|
if (*ppos != 0)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
page = (char*)__get_free_page(GFP_TEMPORARY);
|
|
if (!page)
|
|
goto out;
|
|
|
|
length = -EFAULT;
|
|
if (copy_from_user(page, buf, count))
|
|
goto out_free;
|
|
|
|
/* Guard against adverse ptrace interaction */
|
|
length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
|
|
if (length < 0)
|
|
goto out_free;
|
|
|
|
length = security_setprocattr(task,
|
|
(char*)file->f_path.dentry->d_name.name,
|
|
(void*)page, count);
|
|
mutex_unlock(&task->signal->cred_guard_mutex);
|
|
out_free:
|
|
free_page((unsigned long) page);
|
|
out:
|
|
put_task_struct(task);
|
|
out_no_task:
|
|
return length;
|
|
}
|
|
|
|
static const struct file_operations proc_pid_attr_operations = {
|
|
.read = proc_pid_attr_read,
|
|
.write = proc_pid_attr_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static const struct pid_entry attr_dir_stuff[] = {
|
|
REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
|
|
REG("prev", S_IRUGO, proc_pid_attr_operations),
|
|
REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
|
|
REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
|
|
REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
|
|
REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
|
|
};
|
|
|
|
static int proc_attr_dir_readdir(struct file * filp,
|
|
void * dirent, filldir_t filldir)
|
|
{
|
|
return proc_pident_readdir(filp,dirent,filldir,
|
|
attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
|
|
}
|
|
|
|
static const struct file_operations proc_attr_dir_operations = {
|
|
.read = generic_read_dir,
|
|
.readdir = proc_attr_dir_readdir,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
static struct dentry *proc_attr_dir_lookup(struct inode *dir,
|
|
struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
return proc_pident_lookup(dir, dentry,
|
|
attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
|
|
}
|
|
|
|
static const struct inode_operations proc_attr_dir_inode_operations = {
|
|
.lookup = proc_attr_dir_lookup,
|
|
.getattr = pid_getattr,
|
|
.setattr = proc_setattr,
|
|
};
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_ELF_CORE
|
|
static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
|
|
struct mm_struct *mm;
|
|
char buffer[PROC_NUMBUF];
|
|
size_t len;
|
|
int ret;
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
|
|
ret = 0;
|
|
mm = get_task_mm(task);
|
|
if (mm) {
|
|
len = snprintf(buffer, sizeof(buffer), "%08lx\n",
|
|
((mm->flags & MMF_DUMP_FILTER_MASK) >>
|
|
MMF_DUMP_FILTER_SHIFT));
|
|
mmput(mm);
|
|
ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
|
|
}
|
|
|
|
put_task_struct(task);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t proc_coredump_filter_write(struct file *file,
|
|
const char __user *buf,
|
|
size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
struct task_struct *task;
|
|
struct mm_struct *mm;
|
|
char buffer[PROC_NUMBUF], *end;
|
|
unsigned int val;
|
|
int ret;
|
|
int i;
|
|
unsigned long mask;
|
|
|
|
ret = -EFAULT;
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if (count > sizeof(buffer) - 1)
|
|
count = sizeof(buffer) - 1;
|
|
if (copy_from_user(buffer, buf, count))
|
|
goto out_no_task;
|
|
|
|
ret = -EINVAL;
|
|
val = (unsigned int)simple_strtoul(buffer, &end, 0);
|
|
if (*end == '\n')
|
|
end++;
|
|
if (end - buffer == 0)
|
|
goto out_no_task;
|
|
|
|
ret = -ESRCH;
|
|
task = get_proc_task(file->f_dentry->d_inode);
|
|
if (!task)
|
|
goto out_no_task;
|
|
|
|
ret = end - buffer;
|
|
mm = get_task_mm(task);
|
|
if (!mm)
|
|
goto out_no_mm;
|
|
|
|
for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
|
|
if (val & mask)
|
|
set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
|
|
else
|
|
clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
|
|
}
|
|
|
|
mmput(mm);
|
|
out_no_mm:
|
|
put_task_struct(task);
|
|
out_no_task:
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations proc_coredump_filter_operations = {
|
|
.read = proc_coredump_filter_read,
|
|
.write = proc_coredump_filter_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* /proc/self:
|
|
*/
|
|
static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
|
|
int buflen)
|
|
{
|
|
struct pid_namespace *ns = dentry->d_sb->s_fs_info;
|
|
pid_t tgid = task_tgid_nr_ns(current, ns);
|
|
char tmp[PROC_NUMBUF];
|
|
if (!tgid)
|
|
return -ENOENT;
|
|
sprintf(tmp, "%d", tgid);
|
|
return vfs_readlink(dentry,buffer,buflen,tmp);
|
|
}
|
|
|
|
static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
struct pid_namespace *ns = dentry->d_sb->s_fs_info;
|
|
pid_t tgid = task_tgid_nr_ns(current, ns);
|
|
char *name = ERR_PTR(-ENOENT);
|
|
if (tgid) {
|
|
name = __getname();
|
|
if (!name)
|
|
name = ERR_PTR(-ENOMEM);
|
|
else
|
|
sprintf(name, "%d", tgid);
|
|
}
|
|
nd_set_link(nd, name);
|
|
return NULL;
|
|
}
|
|
|
|
static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
|
|
void *cookie)
|
|
{
|
|
char *s = nd_get_link(nd);
|
|
if (!IS_ERR(s))
|
|
__putname(s);
|
|
}
|
|
|
|
static const struct inode_operations proc_self_inode_operations = {
|
|
.readlink = proc_self_readlink,
|
|
.follow_link = proc_self_follow_link,
|
|
.put_link = proc_self_put_link,
|
|
};
|
|
|
|
/*
|
|
* proc base
|
|
*
|
|
* These are the directory entries in the root directory of /proc
|
|
* that properly belong to the /proc filesystem, as they describe
|
|
* describe something that is process related.
|
|
*/
|
|
static const struct pid_entry proc_base_stuff[] = {
|
|
NOD("self", S_IFLNK|S_IRWXUGO,
|
|
&proc_self_inode_operations, NULL, {}),
|
|
};
|
|
|
|
static struct dentry *proc_base_instantiate(struct inode *dir,
|
|
struct dentry *dentry, struct task_struct *task, const void *ptr)
|
|
{
|
|
const struct pid_entry *p = ptr;
|
|
struct inode *inode;
|
|
struct proc_inode *ei;
|
|
struct dentry *error;
|
|
|
|
/* Allocate the inode */
|
|
error = ERR_PTR(-ENOMEM);
|
|
inode = new_inode(dir->i_sb);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
/* Initialize the inode */
|
|
ei = PROC_I(inode);
|
|
inode->i_ino = get_next_ino();
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
|
|
|
|
/*
|
|
* grab the reference to the task.
|
|
*/
|
|
ei->pid = get_task_pid(task, PIDTYPE_PID);
|
|
if (!ei->pid)
|
|
goto out_iput;
|
|
|
|
inode->i_mode = p->mode;
|
|
if (S_ISDIR(inode->i_mode))
|
|
set_nlink(inode, 2);
|
|
if (S_ISLNK(inode->i_mode))
|
|
inode->i_size = 64;
|
|
if (p->iop)
|
|
inode->i_op = p->iop;
|
|
if (p->fop)
|
|
inode->i_fop = p->fop;
|
|
ei->op = p->op;
|
|
d_add(dentry, inode);
|
|
error = NULL;
|
|
out:
|
|
return error;
|
|
out_iput:
|
|
iput(inode);
|
|
goto out;
|
|
}
|
|
|
|
static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct dentry *error;
|
|
struct task_struct *task = get_proc_task(dir);
|
|
const struct pid_entry *p, *last;
|
|
|
|
error = ERR_PTR(-ENOENT);
|
|
|
|
if (!task)
|
|
goto out_no_task;
|
|
|
|
/* Lookup the directory entry */
|
|
last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
|
|
for (p = proc_base_stuff; p <= last; p++) {
|
|
if (p->len != dentry->d_name.len)
|
|
continue;
|
|
if (!memcmp(dentry->d_name.name, p->name, p->len))
|
|
break;
|
|
}
|
|
if (p > last)
|
|
goto out;
|
|
|
|
error = proc_base_instantiate(dir, dentry, task, p);
|
|
|
|
out:
|
|
put_task_struct(task);
|
|
out_no_task:
|
|
return error;
|
|
}
|
|
|
|
static int proc_base_fill_cache(struct file *filp, void *dirent,
|
|
filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
|
|
{
|
|
return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
|
|
proc_base_instantiate, task, p);
|
|
}
|
|
|
|
#ifdef CONFIG_TASK_IO_ACCOUNTING
|
|
static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
|
|
{
|
|
struct task_io_accounting acct = task->ioac;
|
|
unsigned long flags;
|
|
int result;
|
|
|
|
result = mutex_lock_killable(&task->signal->cred_guard_mutex);
|
|
if (result)
|
|
return result;
|
|
|
|
if (!ptrace_may_access(task, PTRACE_MODE_READ)) {
|
|
result = -EACCES;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (whole && lock_task_sighand(task, &flags)) {
|
|
struct task_struct *t = task;
|
|
|
|
task_io_accounting_add(&acct, &task->signal->ioac);
|
|
while_each_thread(task, t)
|
|
task_io_accounting_add(&acct, &t->ioac);
|
|
|
|
unlock_task_sighand(task, &flags);
|
|
}
|
|
result = sprintf(buffer,
|
|
"rchar: %llu\n"
|
|
"wchar: %llu\n"
|
|
"syscr: %llu\n"
|
|
"syscw: %llu\n"
|
|
"read_bytes: %llu\n"
|
|
"write_bytes: %llu\n"
|
|
"cancelled_write_bytes: %llu\n",
|
|
(unsigned long long)acct.rchar,
|
|
(unsigned long long)acct.wchar,
|
|
(unsigned long long)acct.syscr,
|
|
(unsigned long long)acct.syscw,
|
|
(unsigned long long)acct.read_bytes,
|
|
(unsigned long long)acct.write_bytes,
|
|
(unsigned long long)acct.cancelled_write_bytes);
|
|
out_unlock:
|
|
mutex_unlock(&task->signal->cred_guard_mutex);
|
|
return result;
|
|
}
|
|
|
|
static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
|
|
{
|
|
return do_io_accounting(task, buffer, 0);
|
|
}
|
|
|
|
static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
|
|
{
|
|
return do_io_accounting(task, buffer, 1);
|
|
}
|
|
#endif /* CONFIG_TASK_IO_ACCOUNTING */
|
|
|
|
static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
int err = lock_trace(task);
|
|
if (!err) {
|
|
seq_printf(m, "%08x\n", task->personality);
|
|
unlock_trace(task);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Thread groups
|
|
*/
|
|
static const struct file_operations proc_task_operations;
|
|
static const struct inode_operations proc_task_inode_operations;
|
|
|
|
static const struct pid_entry tgid_base_stuff[] = {
|
|
DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
|
|
DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
|
|
#ifdef CONFIG_CHECKPOINT_RESTORE
|
|
DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations),
|
|
#endif
|
|
DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
|
|
DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
|
|
#ifdef CONFIG_NET
|
|
DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
|
|
#endif
|
|
REG("environ", S_IRUSR, proc_environ_operations),
|
|
INF("auxv", S_IRUSR, proc_pid_auxv),
|
|
ONE("status", S_IRUGO, proc_pid_status),
|
|
ONE("personality", S_IRUGO, proc_pid_personality),
|
|
INF("limits", S_IRUGO, proc_pid_limits),
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
|
|
#endif
|
|
#ifdef CONFIG_SCHED_AUTOGROUP
|
|
REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
|
|
#endif
|
|
REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
|
|
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
|
|
INF("syscall", S_IRUGO, proc_pid_syscall),
|
|
#endif
|
|
INF("cmdline", S_IRUGO, proc_pid_cmdline),
|
|
ONE("stat", S_IRUGO, proc_tgid_stat),
|
|
ONE("statm", S_IRUGO, proc_pid_statm),
|
|
REG("maps", S_IRUGO, proc_pid_maps_operations),
|
|
#ifdef CONFIG_NUMA
|
|
REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),
|
|
#endif
|
|
REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
|
|
LNK("cwd", proc_cwd_link),
|
|
LNK("root", proc_root_link),
|
|
LNK("exe", proc_exe_link),
|
|
REG("mounts", S_IRUGO, proc_mounts_operations),
|
|
REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
|
|
REG("mountstats", S_IRUSR, proc_mountstats_operations),
|
|
#ifdef CONFIG_PROC_PAGE_MONITOR
|
|
REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
|
|
REG("smaps", S_IRUGO, proc_pid_smaps_operations),
|
|
REG("pagemap", S_IRUGO, proc_pagemap_operations),
|
|
#endif
|
|
#ifdef CONFIG_SECURITY
|
|
DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
|
|
#endif
|
|
#ifdef CONFIG_KALLSYMS
|
|
INF("wchan", S_IRUGO, proc_pid_wchan),
|
|
#endif
|
|
#ifdef CONFIG_STACKTRACE
|
|
ONE("stack", S_IRUGO, proc_pid_stack),
|
|
#endif
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
INF("schedstat", S_IRUGO, proc_pid_schedstat),
|
|
#endif
|
|
#ifdef CONFIG_LATENCYTOP
|
|
REG("latency", S_IRUGO, proc_lstats_operations),
|
|
#endif
|
|
#ifdef CONFIG_PROC_PID_CPUSET
|
|
REG("cpuset", S_IRUGO, proc_cpuset_operations),
|
|
#endif
|
|
#ifdef CONFIG_CGROUPS
|
|
REG("cgroup", S_IRUGO, proc_cgroup_operations),
|
|
#endif
|
|
INF("oom_score", S_IRUGO, proc_oom_score),
|
|
REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
|
|
REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
|
|
#ifdef CONFIG_AUDITSYSCALL
|
|
REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
|
|
REG("sessionid", S_IRUGO, proc_sessionid_operations),
|
|
#endif
|
|
#ifdef CONFIG_FAULT_INJECTION
|
|
REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
|
|
#endif
|
|
#ifdef CONFIG_ELF_CORE
|
|
REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
|
|
#endif
|
|
#ifdef CONFIG_TASK_IO_ACCOUNTING
|
|
INF("io", S_IRUSR, proc_tgid_io_accounting),
|
|
#endif
|
|
#ifdef CONFIG_HARDWALL
|
|
INF("hardwall", S_IRUGO, proc_pid_hardwall),
|
|
#endif
|
|
};
|
|
|
|
static int proc_tgid_base_readdir(struct file * filp,
|
|
void * dirent, filldir_t filldir)
|
|
{
|
|
return proc_pident_readdir(filp,dirent,filldir,
|
|
tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
|
|
}
|
|
|
|
static const struct file_operations proc_tgid_base_operations = {
|
|
.read = generic_read_dir,
|
|
.readdir = proc_tgid_base_readdir,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
|
|
return proc_pident_lookup(dir, dentry,
|
|
tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
|
|
}
|
|
|
|
static const struct inode_operations proc_tgid_base_inode_operations = {
|
|
.lookup = proc_tgid_base_lookup,
|
|
.getattr = pid_getattr,
|
|
.setattr = proc_setattr,
|
|
.permission = proc_pid_permission,
|
|
};
|
|
|
|
static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
|
|
{
|
|
struct dentry *dentry, *leader, *dir;
|
|
char buf[PROC_NUMBUF];
|
|
struct qstr name;
|
|
|
|
name.name = buf;
|
|
name.len = snprintf(buf, sizeof(buf), "%d", pid);
|
|
dentry = d_hash_and_lookup(mnt->mnt_root, &name);
|
|
if (dentry) {
|
|
shrink_dcache_parent(dentry);
|
|
d_drop(dentry);
|
|
dput(dentry);
|
|
}
|
|
|
|
name.name = buf;
|
|
name.len = snprintf(buf, sizeof(buf), "%d", tgid);
|
|
leader = d_hash_and_lookup(mnt->mnt_root, &name);
|
|
if (!leader)
|
|
goto out;
|
|
|
|
name.name = "task";
|
|
name.len = strlen(name.name);
|
|
dir = d_hash_and_lookup(leader, &name);
|
|
if (!dir)
|
|
goto out_put_leader;
|
|
|
|
name.name = buf;
|
|
name.len = snprintf(buf, sizeof(buf), "%d", pid);
|
|
dentry = d_hash_and_lookup(dir, &name);
|
|
if (dentry) {
|
|
shrink_dcache_parent(dentry);
|
|
d_drop(dentry);
|
|
dput(dentry);
|
|
}
|
|
|
|
dput(dir);
|
|
out_put_leader:
|
|
dput(leader);
|
|
out:
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* proc_flush_task - Remove dcache entries for @task from the /proc dcache.
|
|
* @task: task that should be flushed.
|
|
*
|
|
* When flushing dentries from proc, one needs to flush them from global
|
|
* proc (proc_mnt) and from all the namespaces' procs this task was seen
|
|
* in. This call is supposed to do all of this job.
|
|
*
|
|
* Looks in the dcache for
|
|
* /proc/@pid
|
|
* /proc/@tgid/task/@pid
|
|
* if either directory is present flushes it and all of it'ts children
|
|
* from the dcache.
|
|
*
|
|
* It is safe and reasonable to cache /proc entries for a task until
|
|
* that task exits. After that they just clog up the dcache with
|
|
* useless entries, possibly causing useful dcache entries to be
|
|
* flushed instead. This routine is proved to flush those useless
|
|
* dcache entries at process exit time.
|
|
*
|
|
* NOTE: This routine is just an optimization so it does not guarantee
|
|
* that no dcache entries will exist at process exit time it
|
|
* just makes it very unlikely that any will persist.
|
|
*/
|
|
|
|
void proc_flush_task(struct task_struct *task)
|
|
{
|
|
int i;
|
|
struct pid *pid, *tgid;
|
|
struct upid *upid;
|
|
|
|
pid = task_pid(task);
|
|
tgid = task_tgid(task);
|
|
|
|
for (i = 0; i <= pid->level; i++) {
|
|
upid = &pid->numbers[i];
|
|
proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
|
|
tgid->numbers[i].nr);
|
|
}
|
|
|
|
upid = &pid->numbers[pid->level];
|
|
if (upid->nr == 1)
|
|
pid_ns_release_proc(upid->ns);
|
|
}
|
|
|
|
static struct dentry *proc_pid_instantiate(struct inode *dir,
|
|
struct dentry * dentry,
|
|
struct task_struct *task, const void *ptr)
|
|
{
|
|
struct dentry *error = ERR_PTR(-ENOENT);
|
|
struct inode *inode;
|
|
|
|
inode = proc_pid_make_inode(dir->i_sb, task);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
|
|
inode->i_op = &proc_tgid_base_inode_operations;
|
|
inode->i_fop = &proc_tgid_base_operations;
|
|
inode->i_flags|=S_IMMUTABLE;
|
|
|
|
set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff,
|
|
ARRAY_SIZE(tgid_base_stuff)));
|
|
|
|
d_set_d_op(dentry, &pid_dentry_operations);
|
|
|
|
d_add(dentry, inode);
|
|
/* Close the race of the process dying before we return the dentry */
|
|
if (pid_revalidate(dentry, NULL))
|
|
error = NULL;
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
|
|
{
|
|
struct dentry *result;
|
|
struct task_struct *task;
|
|
unsigned tgid;
|
|
struct pid_namespace *ns;
|
|
|
|
result = proc_base_lookup(dir, dentry);
|
|
if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
|
|
goto out;
|
|
|
|
tgid = name_to_int(dentry);
|
|
if (tgid == ~0U)
|
|
goto out;
|
|
|
|
ns = dentry->d_sb->s_fs_info;
|
|
rcu_read_lock();
|
|
task = find_task_by_pid_ns(tgid, ns);
|
|
if (task)
|
|
get_task_struct(task);
|
|
rcu_read_unlock();
|
|
if (!task)
|
|
goto out;
|
|
|
|
result = proc_pid_instantiate(dir, dentry, task, NULL);
|
|
put_task_struct(task);
|
|
out:
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Find the first task with tgid >= tgid
|
|
*
|
|
*/
|
|
struct tgid_iter {
|
|
unsigned int tgid;
|
|
struct task_struct *task;
|
|
};
|
|
static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
|
|
{
|
|
struct pid *pid;
|
|
|
|
if (iter.task)
|
|
put_task_struct(iter.task);
|
|
rcu_read_lock();
|
|
retry:
|
|
iter.task = NULL;
|
|
pid = find_ge_pid(iter.tgid, ns);
|
|
if (pid) {
|
|
iter.tgid = pid_nr_ns(pid, ns);
|
|
iter.task = pid_task(pid, PIDTYPE_PID);
|
|
/* What we to know is if the pid we have find is the
|
|
* pid of a thread_group_leader. Testing for task
|
|
* being a thread_group_leader is the obvious thing
|
|
* todo but there is a window when it fails, due to
|
|
* the pid transfer logic in de_thread.
|
|
*
|
|
* So we perform the straight forward test of seeing
|
|
* if the pid we have found is the pid of a thread
|
|
* group leader, and don't worry if the task we have
|
|
* found doesn't happen to be a thread group leader.
|
|
* As we don't care in the case of readdir.
|
|
*/
|
|
if (!iter.task || !has_group_leader_pid(iter.task)) {
|
|
iter.tgid += 1;
|
|
goto retry;
|
|
}
|
|
get_task_struct(iter.task);
|
|
}
|
|
rcu_read_unlock();
|
|
return iter;
|
|
}
|
|
|
|
#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
|
|
|
|
static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
|
|
struct tgid_iter iter)
|
|
{
|
|
char name[PROC_NUMBUF];
|
|
int len = snprintf(name, sizeof(name), "%d", iter.tgid);
|
|
return proc_fill_cache(filp, dirent, filldir, name, len,
|
|
proc_pid_instantiate, iter.task, NULL);
|
|
}
|
|
|
|
static int fake_filldir(void *buf, const char *name, int namelen,
|
|
loff_t offset, u64 ino, unsigned d_type)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* for the /proc/ directory itself, after non-process stuff has been done */
|
|
int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
|
|
{
|
|
unsigned int nr;
|
|
struct task_struct *reaper;
|
|
struct tgid_iter iter;
|
|
struct pid_namespace *ns;
|
|
filldir_t __filldir;
|
|
|
|
if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET)
|
|
goto out_no_task;
|
|
nr = filp->f_pos - FIRST_PROCESS_ENTRY;
|
|
|
|
reaper = get_proc_task(filp->f_path.dentry->d_inode);
|
|
if (!reaper)
|
|
goto out_no_task;
|
|
|
|
for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
|
|
const struct pid_entry *p = &proc_base_stuff[nr];
|
|
if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
|
|
goto out;
|
|
}
|
|
|
|
ns = filp->f_dentry->d_sb->s_fs_info;
|
|
iter.task = NULL;
|
|
iter.tgid = filp->f_pos - TGID_OFFSET;
|
|
for (iter = next_tgid(ns, iter);
|
|
iter.task;
|
|
iter.tgid += 1, iter = next_tgid(ns, iter)) {
|
|
if (has_pid_permissions(ns, iter.task, 2))
|
|
__filldir = filldir;
|
|
else
|
|
__filldir = fake_filldir;
|
|
|
|
filp->f_pos = iter.tgid + TGID_OFFSET;
|
|
if (proc_pid_fill_cache(filp, dirent, __filldir, iter) < 0) {
|
|
put_task_struct(iter.task);
|
|
goto out;
|
|
}
|
|
}
|
|
filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
|
|
out:
|
|
put_task_struct(reaper);
|
|
out_no_task:
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Tasks
|
|
*/
|
|
static const struct pid_entry tid_base_stuff[] = {
|
|
DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
|
|
DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
|
|
DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
|
|
REG("environ", S_IRUSR, proc_environ_operations),
|
|
INF("auxv", S_IRUSR, proc_pid_auxv),
|
|
ONE("status", S_IRUGO, proc_pid_status),
|
|
ONE("personality", S_IRUGO, proc_pid_personality),
|
|
INF("limits", S_IRUGO, proc_pid_limits),
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
|
|
#endif
|
|
REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
|
|
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
|
|
INF("syscall", S_IRUGO, proc_pid_syscall),
|
|
#endif
|
|
INF("cmdline", S_IRUGO, proc_pid_cmdline),
|
|
ONE("stat", S_IRUGO, proc_tid_stat),
|
|
ONE("statm", S_IRUGO, proc_pid_statm),
|
|
REG("maps", S_IRUGO, proc_tid_maps_operations),
|
|
#ifdef CONFIG_NUMA
|
|
REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations),
|
|
#endif
|
|
REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
|
|
LNK("cwd", proc_cwd_link),
|
|
LNK("root", proc_root_link),
|
|
LNK("exe", proc_exe_link),
|
|
REG("mounts", S_IRUGO, proc_mounts_operations),
|
|
REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
|
|
#ifdef CONFIG_PROC_PAGE_MONITOR
|
|
REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
|
|
REG("smaps", S_IRUGO, proc_tid_smaps_operations),
|
|
REG("pagemap", S_IRUGO, proc_pagemap_operations),
|
|
#endif
|
|
#ifdef CONFIG_SECURITY
|
|
DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
|
|
#endif
|
|
#ifdef CONFIG_KALLSYMS
|
|
INF("wchan", S_IRUGO, proc_pid_wchan),
|
|
#endif
|
|
#ifdef CONFIG_STACKTRACE
|
|
ONE("stack", S_IRUGO, proc_pid_stack),
|
|
#endif
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
INF("schedstat", S_IRUGO, proc_pid_schedstat),
|
|
#endif
|
|
#ifdef CONFIG_LATENCYTOP
|
|
REG("latency", S_IRUGO, proc_lstats_operations),
|
|
#endif
|
|
#ifdef CONFIG_PROC_PID_CPUSET
|
|
REG("cpuset", S_IRUGO, proc_cpuset_operations),
|
|
#endif
|
|
#ifdef CONFIG_CGROUPS
|
|
REG("cgroup", S_IRUGO, proc_cgroup_operations),
|
|
#endif
|
|
INF("oom_score", S_IRUGO, proc_oom_score),
|
|
REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
|
|
REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
|
|
#ifdef CONFIG_AUDITSYSCALL
|
|
REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
|
|
REG("sessionid", S_IRUGO, proc_sessionid_operations),
|
|
#endif
|
|
#ifdef CONFIG_FAULT_INJECTION
|
|
REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
|
|
#endif
|
|
#ifdef CONFIG_TASK_IO_ACCOUNTING
|
|
INF("io", S_IRUSR, proc_tid_io_accounting),
|
|
#endif
|
|
#ifdef CONFIG_HARDWALL
|
|
INF("hardwall", S_IRUGO, proc_pid_hardwall),
|
|
#endif
|
|
};
|
|
|
|
static int proc_tid_base_readdir(struct file * filp,
|
|
void * dirent, filldir_t filldir)
|
|
{
|
|
return proc_pident_readdir(filp,dirent,filldir,
|
|
tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
|
|
}
|
|
|
|
static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
|
|
return proc_pident_lookup(dir, dentry,
|
|
tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
|
|
}
|
|
|
|
static const struct file_operations proc_tid_base_operations = {
|
|
.read = generic_read_dir,
|
|
.readdir = proc_tid_base_readdir,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
static const struct inode_operations proc_tid_base_inode_operations = {
|
|
.lookup = proc_tid_base_lookup,
|
|
.getattr = pid_getattr,
|
|
.setattr = proc_setattr,
|
|
};
|
|
|
|
static struct dentry *proc_task_instantiate(struct inode *dir,
|
|
struct dentry *dentry, struct task_struct *task, const void *ptr)
|
|
{
|
|
struct dentry *error = ERR_PTR(-ENOENT);
|
|
struct inode *inode;
|
|
inode = proc_pid_make_inode(dir->i_sb, task);
|
|
|
|
if (!inode)
|
|
goto out;
|
|
inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
|
|
inode->i_op = &proc_tid_base_inode_operations;
|
|
inode->i_fop = &proc_tid_base_operations;
|
|
inode->i_flags|=S_IMMUTABLE;
|
|
|
|
set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff,
|
|
ARRAY_SIZE(tid_base_stuff)));
|
|
|
|
d_set_d_op(dentry, &pid_dentry_operations);
|
|
|
|
d_add(dentry, inode);
|
|
/* Close the race of the process dying before we return the dentry */
|
|
if (pid_revalidate(dentry, NULL))
|
|
error = NULL;
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
|
|
{
|
|
struct dentry *result = ERR_PTR(-ENOENT);
|
|
struct task_struct *task;
|
|
struct task_struct *leader = get_proc_task(dir);
|
|
unsigned tid;
|
|
struct pid_namespace *ns;
|
|
|
|
if (!leader)
|
|
goto out_no_task;
|
|
|
|
tid = name_to_int(dentry);
|
|
if (tid == ~0U)
|
|
goto out;
|
|
|
|
ns = dentry->d_sb->s_fs_info;
|
|
rcu_read_lock();
|
|
task = find_task_by_pid_ns(tid, ns);
|
|
if (task)
|
|
get_task_struct(task);
|
|
rcu_read_unlock();
|
|
if (!task)
|
|
goto out;
|
|
if (!same_thread_group(leader, task))
|
|
goto out_drop_task;
|
|
|
|
result = proc_task_instantiate(dir, dentry, task, NULL);
|
|
out_drop_task:
|
|
put_task_struct(task);
|
|
out:
|
|
put_task_struct(leader);
|
|
out_no_task:
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Find the first tid of a thread group to return to user space.
|
|
*
|
|
* Usually this is just the thread group leader, but if the users
|
|
* buffer was too small or there was a seek into the middle of the
|
|
* directory we have more work todo.
|
|
*
|
|
* In the case of a short read we start with find_task_by_pid.
|
|
*
|
|
* In the case of a seek we start with the leader and walk nr
|
|
* threads past it.
|
|
*/
|
|
static struct task_struct *first_tid(struct task_struct *leader,
|
|
int tid, int nr, struct pid_namespace *ns)
|
|
{
|
|
struct task_struct *pos;
|
|
|
|
rcu_read_lock();
|
|
/* Attempt to start with the pid of a thread */
|
|
if (tid && (nr > 0)) {
|
|
pos = find_task_by_pid_ns(tid, ns);
|
|
if (pos && (pos->group_leader == leader))
|
|
goto found;
|
|
}
|
|
|
|
/* If nr exceeds the number of threads there is nothing todo */
|
|
pos = NULL;
|
|
if (nr && nr >= get_nr_threads(leader))
|
|
goto out;
|
|
|
|
/* If we haven't found our starting place yet start
|
|
* with the leader and walk nr threads forward.
|
|
*/
|
|
for (pos = leader; nr > 0; --nr) {
|
|
pos = next_thread(pos);
|
|
if (pos == leader) {
|
|
pos = NULL;
|
|
goto out;
|
|
}
|
|
}
|
|
found:
|
|
get_task_struct(pos);
|
|
out:
|
|
rcu_read_unlock();
|
|
return pos;
|
|
}
|
|
|
|
/*
|
|
* Find the next thread in the thread list.
|
|
* Return NULL if there is an error or no next thread.
|
|
*
|
|
* The reference to the input task_struct is released.
|
|
*/
|
|
static struct task_struct *next_tid(struct task_struct *start)
|
|
{
|
|
struct task_struct *pos = NULL;
|
|
rcu_read_lock();
|
|
if (pid_alive(start)) {
|
|
pos = next_thread(start);
|
|
if (thread_group_leader(pos))
|
|
pos = NULL;
|
|
else
|
|
get_task_struct(pos);
|
|
}
|
|
rcu_read_unlock();
|
|
put_task_struct(start);
|
|
return pos;
|
|
}
|
|
|
|
static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
|
|
struct task_struct *task, int tid)
|
|
{
|
|
char name[PROC_NUMBUF];
|
|
int len = snprintf(name, sizeof(name), "%d", tid);
|
|
return proc_fill_cache(filp, dirent, filldir, name, len,
|
|
proc_task_instantiate, task, NULL);
|
|
}
|
|
|
|
/* for the /proc/TGID/task/ directories */
|
|
static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
|
|
{
|
|
struct dentry *dentry = filp->f_path.dentry;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct task_struct *leader = NULL;
|
|
struct task_struct *task;
|
|
int retval = -ENOENT;
|
|
ino_t ino;
|
|
int tid;
|
|
struct pid_namespace *ns;
|
|
|
|
task = get_proc_task(inode);
|
|
if (!task)
|
|
goto out_no_task;
|
|
rcu_read_lock();
|
|
if (pid_alive(task)) {
|
|
leader = task->group_leader;
|
|
get_task_struct(leader);
|
|
}
|
|
rcu_read_unlock();
|
|
put_task_struct(task);
|
|
if (!leader)
|
|
goto out_no_task;
|
|
retval = 0;
|
|
|
|
switch ((unsigned long)filp->f_pos) {
|
|
case 0:
|
|
ino = inode->i_ino;
|
|
if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
|
|
goto out;
|
|
filp->f_pos++;
|
|
/* fall through */
|
|
case 1:
|
|
ino = parent_ino(dentry);
|
|
if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
|
|
goto out;
|
|
filp->f_pos++;
|
|
/* fall through */
|
|
}
|
|
|
|
/* f_version caches the tgid value that the last readdir call couldn't
|
|
* return. lseek aka telldir automagically resets f_version to 0.
|
|
*/
|
|
ns = filp->f_dentry->d_sb->s_fs_info;
|
|
tid = (int)filp->f_version;
|
|
filp->f_version = 0;
|
|
for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
|
|
task;
|
|
task = next_tid(task), filp->f_pos++) {
|
|
tid = task_pid_nr_ns(task, ns);
|
|
if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
|
|
/* returning this tgid failed, save it as the first
|
|
* pid for the next readir call */
|
|
filp->f_version = (u64)tid;
|
|
put_task_struct(task);
|
|
break;
|
|
}
|
|
}
|
|
out:
|
|
put_task_struct(leader);
|
|
out_no_task:
|
|
return retval;
|
|
}
|
|
|
|
static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct task_struct *p = get_proc_task(inode);
|
|
generic_fillattr(inode, stat);
|
|
|
|
if (p) {
|
|
stat->nlink += get_nr_threads(p);
|
|
put_task_struct(p);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct inode_operations proc_task_inode_operations = {
|
|
.lookup = proc_task_lookup,
|
|
.getattr = proc_task_getattr,
|
|
.setattr = proc_setattr,
|
|
.permission = proc_pid_permission,
|
|
};
|
|
|
|
static const struct file_operations proc_task_operations = {
|
|
.read = generic_read_dir,
|
|
.readdir = proc_task_readdir,
|
|
.llseek = default_llseek,
|
|
};
|