2010-03-07 17:41:34 -07:00
|
|
|
#include <linux/proc_fs.h>
|
|
|
|
#include <linux/nsproxy.h>
|
|
|
|
#include <linux/ptrace.h>
|
|
|
|
#include <linux/namei.h>
|
|
|
|
#include <linux/file.h>
|
|
|
|
#include <linux/utsname.h>
|
|
|
|
#include <net/net_namespace.h>
|
|
|
|
#include <linux/ipc_namespace.h>
|
|
|
|
#include <linux/pid_namespace.h>
|
2012-07-26 07:24:06 -06:00
|
|
|
#include <linux/user_namespace.h>
|
2010-03-07 17:41:34 -07:00
|
|
|
#include "internal.h"
|
|
|
|
|
|
|
|
|
|
|
|
static const struct proc_ns_operations *ns_entries[] = {
|
2010-03-07 19:14:23 -07:00
|
|
|
#ifdef CONFIG_NET_NS
|
|
|
|
&netns_operations,
|
|
|
|
#endif
|
2010-03-07 19:43:27 -07:00
|
|
|
#ifdef CONFIG_UTS_NS
|
|
|
|
&utsns_operations,
|
|
|
|
#endif
|
2010-03-07 19:48:39 -07:00
|
|
|
#ifdef CONFIG_IPC_NS
|
|
|
|
&ipcns_operations,
|
|
|
|
#endif
|
2010-03-07 19:17:03 -07:00
|
|
|
#ifdef CONFIG_PID_NS
|
|
|
|
&pidns_operations,
|
2012-07-26 07:24:06 -06:00
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_USER_NS
|
|
|
|
&userns_operations,
|
2010-03-07 19:17:03 -07:00
|
|
|
#endif
|
2010-03-07 19:49:36 -07:00
|
|
|
&mntns_operations,
|
2010-03-07 17:41:34 -07:00
|
|
|
};
|
|
|
|
|
2015-05-02 11:37:52 -06:00
|
|
|
static const char *proc_ns_follow_link(struct dentry *dentry, void **cookie)
|
2011-06-18 18:48:18 -06:00
|
|
|
{
|
2015-03-17 16:25:59 -06:00
|
|
|
struct inode *inode = d_inode(dentry);
|
2014-11-01 09:10:28 -06:00
|
|
|
const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops;
|
2011-06-18 18:48:18 -06:00
|
|
|
struct task_struct *task;
|
2013-03-09 01:14:45 -07:00
|
|
|
struct path ns_path;
|
2011-06-18 18:48:18 -06:00
|
|
|
void *error = ERR_PTR(-EACCES);
|
|
|
|
|
|
|
|
task = get_proc_task(inode);
|
|
|
|
if (!task)
|
take the targets of /proc/*/ns/* symlinks to separate fs
New pseudo-filesystem: nsfs. Targets of /proc/*/ns/* live there now.
It's not mountable (not even registered, so it's not in /proc/filesystems,
etc.). Files on it *are* bindable - we explicitly permit that in do_loopback().
This stuff lives in fs/nsfs.c now; proc_ns_fget() moved there as well.
get_proc_ns() is a macro now (it's simply returning ->i_private; would
have been an inline, if not for header ordering headache).
proc_ns_inode() is an ex-parrot. The interface used in procfs is
ns_get_path(path, task, ops) and ns_get_name(buf, size, task, ops).
Dentries and inodes are never hashed; a non-counting reference to dentry
is stashed in ns_common (removed by ->d_prune()) and reused by ns_get_path()
if present. See ns_get_path()/ns_prune_dentry/nsfs_evict() for details
of that mechanism.
As the result, proc_ns_follow_link() has stopped poking in nd->path.mnt;
it does nd_jump_link() on a consistent <vfsmount,dentry> pair it gets
from ns_get_path().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-11-01 08:57:28 -06:00
|
|
|
return error;
|
2011-06-18 18:48:18 -06:00
|
|
|
|
take the targets of /proc/*/ns/* symlinks to separate fs
New pseudo-filesystem: nsfs. Targets of /proc/*/ns/* live there now.
It's not mountable (not even registered, so it's not in /proc/filesystems,
etc.). Files on it *are* bindable - we explicitly permit that in do_loopback().
This stuff lives in fs/nsfs.c now; proc_ns_fget() moved there as well.
get_proc_ns() is a macro now (it's simply returning ->i_private; would
have been an inline, if not for header ordering headache).
proc_ns_inode() is an ex-parrot. The interface used in procfs is
ns_get_path(path, task, ops) and ns_get_name(buf, size, task, ops).
Dentries and inodes are never hashed; a non-counting reference to dentry
is stashed in ns_common (removed by ->d_prune()) and reused by ns_get_path()
if present. See ns_get_path()/ns_prune_dentry/nsfs_evict() for details
of that mechanism.
As the result, proc_ns_follow_link() has stopped poking in nd->path.mnt;
it does nd_jump_link() on a consistent <vfsmount,dentry> pair it gets
from ns_get_path().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-11-01 08:57:28 -06:00
|
|
|
if (ptrace_may_access(task, PTRACE_MODE_READ)) {
|
|
|
|
error = ns_get_path(&ns_path, task, ns_ops);
|
|
|
|
if (!error)
|
2015-05-02 11:37:52 -06:00
|
|
|
nd_jump_link(&ns_path);
|
2011-06-18 18:48:18 -06:00
|
|
|
}
|
|
|
|
put_task_struct(task);
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int buflen)
|
|
|
|
{
|
2015-03-17 16:25:59 -06:00
|
|
|
struct inode *inode = d_inode(dentry);
|
2014-11-01 09:10:28 -06:00
|
|
|
const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops;
|
2011-06-18 18:48:18 -06:00
|
|
|
struct task_struct *task;
|
|
|
|
char name[50];
|
2014-03-14 11:42:45 -06:00
|
|
|
int res = -EACCES;
|
2011-06-18 18:48:18 -06:00
|
|
|
|
|
|
|
task = get_proc_task(inode);
|
|
|
|
if (!task)
|
take the targets of /proc/*/ns/* symlinks to separate fs
New pseudo-filesystem: nsfs. Targets of /proc/*/ns/* live there now.
It's not mountable (not even registered, so it's not in /proc/filesystems,
etc.). Files on it *are* bindable - we explicitly permit that in do_loopback().
This stuff lives in fs/nsfs.c now; proc_ns_fget() moved there as well.
get_proc_ns() is a macro now (it's simply returning ->i_private; would
have been an inline, if not for header ordering headache).
proc_ns_inode() is an ex-parrot. The interface used in procfs is
ns_get_path(path, task, ops) and ns_get_name(buf, size, task, ops).
Dentries and inodes are never hashed; a non-counting reference to dentry
is stashed in ns_common (removed by ->d_prune()) and reused by ns_get_path()
if present. See ns_get_path()/ns_prune_dentry/nsfs_evict() for details
of that mechanism.
As the result, proc_ns_follow_link() has stopped poking in nd->path.mnt;
it does nd_jump_link() on a consistent <vfsmount,dentry> pair it gets
from ns_get_path().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-11-01 08:57:28 -06:00
|
|
|
return res;
|
2011-06-18 18:48:18 -06:00
|
|
|
|
take the targets of /proc/*/ns/* symlinks to separate fs
New pseudo-filesystem: nsfs. Targets of /proc/*/ns/* live there now.
It's not mountable (not even registered, so it's not in /proc/filesystems,
etc.). Files on it *are* bindable - we explicitly permit that in do_loopback().
This stuff lives in fs/nsfs.c now; proc_ns_fget() moved there as well.
get_proc_ns() is a macro now (it's simply returning ->i_private; would
have been an inline, if not for header ordering headache).
proc_ns_inode() is an ex-parrot. The interface used in procfs is
ns_get_path(path, task, ops) and ns_get_name(buf, size, task, ops).
Dentries and inodes are never hashed; a non-counting reference to dentry
is stashed in ns_common (removed by ->d_prune()) and reused by ns_get_path()
if present. See ns_get_path()/ns_prune_dentry/nsfs_evict() for details
of that mechanism.
As the result, proc_ns_follow_link() has stopped poking in nd->path.mnt;
it does nd_jump_link() on a consistent <vfsmount,dentry> pair it gets
from ns_get_path().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-11-01 08:57:28 -06:00
|
|
|
if (ptrace_may_access(task, PTRACE_MODE_READ)) {
|
|
|
|
res = ns_get_name(name, sizeof(name), task, ns_ops);
|
|
|
|
if (res >= 0)
|
|
|
|
res = readlink_copy(buffer, buflen, name);
|
|
|
|
}
|
2011-06-18 18:48:18 -06:00
|
|
|
put_task_struct(task);
|
2014-03-14 11:42:45 -06:00
|
|
|
return res;
|
2011-06-18 18:48:18 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static const struct inode_operations proc_ns_link_inode_operations = {
|
|
|
|
.readlink = proc_ns_readlink,
|
|
|
|
.follow_link = proc_ns_follow_link,
|
|
|
|
.setattr = proc_setattr,
|
|
|
|
};
|
|
|
|
|
2013-06-15 01:15:20 -06:00
|
|
|
static int proc_ns_instantiate(struct inode *dir,
|
2010-03-07 17:41:34 -07:00
|
|
|
struct dentry *dentry, struct task_struct *task, const void *ptr)
|
|
|
|
{
|
|
|
|
const struct proc_ns_operations *ns_ops = ptr;
|
|
|
|
struct inode *inode;
|
|
|
|
struct proc_inode *ei;
|
|
|
|
|
|
|
|
inode = proc_pid_make_inode(dir->i_sb, task);
|
|
|
|
if (!inode)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
ei = PROC_I(inode);
|
2011-06-18 18:48:18 -06:00
|
|
|
inode->i_mode = S_IFLNK|S_IRWXUGO;
|
|
|
|
inode->i_op = &proc_ns_link_inode_operations;
|
2014-11-01 09:10:28 -06:00
|
|
|
ei->ns_ops = ns_ops;
|
2010-03-07 17:41:34 -07:00
|
|
|
|
2012-03-23 16:02:55 -06:00
|
|
|
d_set_d_op(dentry, &pid_dentry_operations);
|
2010-03-07 17:41:34 -07:00
|
|
|
d_add(dentry, inode);
|
|
|
|
/* Close the race of the process dying before we return the dentry */
|
2012-06-10 14:03:43 -06:00
|
|
|
if (pid_revalidate(dentry, 0))
|
2013-06-15 01:15:20 -06:00
|
|
|
return 0;
|
2010-03-07 17:41:34 -07:00
|
|
|
out:
|
2013-06-15 01:15:20 -06:00
|
|
|
return -ENOENT;
|
2010-03-07 17:41:34 -07:00
|
|
|
}
|
|
|
|
|
2013-05-16 10:07:31 -06:00
|
|
|
static int proc_ns_dir_readdir(struct file *file, struct dir_context *ctx)
|
2010-03-07 17:41:34 -07:00
|
|
|
{
|
2013-05-16 10:07:31 -06:00
|
|
|
struct task_struct *task = get_proc_task(file_inode(file));
|
2010-03-07 17:41:34 -07:00
|
|
|
const struct proc_ns_operations **entry, **last;
|
|
|
|
|
|
|
|
if (!task)
|
2013-05-16 10:07:31 -06:00
|
|
|
return -ENOENT;
|
2010-03-07 17:41:34 -07:00
|
|
|
|
2013-05-16 10:07:31 -06:00
|
|
|
if (!dir_emit_dots(file, ctx))
|
|
|
|
goto out;
|
|
|
|
if (ctx->pos >= 2 + ARRAY_SIZE(ns_entries))
|
|
|
|
goto out;
|
|
|
|
entry = ns_entries + (ctx->pos - 2);
|
|
|
|
last = &ns_entries[ARRAY_SIZE(ns_entries) - 1];
|
|
|
|
while (entry <= last) {
|
|
|
|
const struct proc_ns_operations *ops = *entry;
|
|
|
|
if (!proc_fill_cache(file, ctx, ops->name, strlen(ops->name),
|
|
|
|
proc_ns_instantiate, task, ops))
|
|
|
|
break;
|
|
|
|
ctx->pos++;
|
|
|
|
entry++;
|
|
|
|
}
|
2010-03-07 17:41:34 -07:00
|
|
|
out:
|
|
|
|
put_task_struct(task);
|
2013-05-16 10:07:31 -06:00
|
|
|
return 0;
|
2010-03-07 17:41:34 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
const struct file_operations proc_ns_dir_operations = {
|
|
|
|
.read = generic_read_dir,
|
2013-05-16 10:07:31 -06:00
|
|
|
.iterate = proc_ns_dir_readdir,
|
2010-03-07 17:41:34 -07:00
|
|
|
};
|
|
|
|
|
|
|
|
static struct dentry *proc_ns_dir_lookup(struct inode *dir,
|
2012-06-10 15:13:09 -06:00
|
|
|
struct dentry *dentry, unsigned int flags)
|
2010-03-07 17:41:34 -07:00
|
|
|
{
|
2013-06-15 01:15:20 -06:00
|
|
|
int error;
|
2010-03-07 17:41:34 -07:00
|
|
|
struct task_struct *task = get_proc_task(dir);
|
|
|
|
const struct proc_ns_operations **entry, **last;
|
|
|
|
unsigned int len = dentry->d_name.len;
|
|
|
|
|
2013-06-15 01:15:20 -06:00
|
|
|
error = -ENOENT;
|
2010-03-07 17:41:34 -07:00
|
|
|
|
|
|
|
if (!task)
|
|
|
|
goto out_no_task;
|
|
|
|
|
2012-03-28 15:42:52 -06:00
|
|
|
last = &ns_entries[ARRAY_SIZE(ns_entries)];
|
|
|
|
for (entry = ns_entries; entry < last; entry++) {
|
2010-03-07 17:41:34 -07:00
|
|
|
if (strlen((*entry)->name) != len)
|
|
|
|
continue;
|
|
|
|
if (!memcmp(dentry->d_name.name, (*entry)->name, len))
|
|
|
|
break;
|
|
|
|
}
|
2012-03-28 15:42:52 -06:00
|
|
|
if (entry == last)
|
2010-03-07 17:41:34 -07:00
|
|
|
goto out;
|
|
|
|
|
|
|
|
error = proc_ns_instantiate(dir, dentry, task, *entry);
|
|
|
|
out:
|
|
|
|
put_task_struct(task);
|
|
|
|
out_no_task:
|
2013-06-15 01:15:20 -06:00
|
|
|
return ERR_PTR(error);
|
2010-03-07 17:41:34 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
const struct inode_operations proc_ns_dir_inode_operations = {
|
|
|
|
.lookup = proc_ns_dir_lookup,
|
|
|
|
.getattr = pid_getattr,
|
|
|
|
.setattr = proc_setattr,
|
|
|
|
};
|