![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
519 lines
12 KiB
C
519 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/proc/inode.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#include <linux/time.h>
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#include <linux/proc_fs.h>
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#include <linux/kernel.h>
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#include <linux/pid_namespace.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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#include <linux/completion.h>
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#include <linux/poll.h>
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#include <linux/printk.h>
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#include <linux/file.h>
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#include <linux/limits.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/sysctl.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/mount.h>
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#include <linux/magic.h>
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#include <linux/uaccess.h>
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#include "internal.h"
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static void proc_evict_inode(struct inode *inode)
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{
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struct proc_dir_entry *de;
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struct ctl_table_header *head;
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truncate_inode_pages_final(&inode->i_data);
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clear_inode(inode);
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/* Stop tracking associated processes */
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put_pid(PROC_I(inode)->pid);
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/* Let go of any associated proc directory entry */
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de = PDE(inode);
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if (de)
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pde_put(de);
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head = PROC_I(inode)->sysctl;
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if (head) {
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RCU_INIT_POINTER(PROC_I(inode)->sysctl, NULL);
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proc_sys_evict_inode(inode, head);
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}
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}
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static struct kmem_cache * proc_inode_cachep;
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static struct inode *proc_alloc_inode(struct super_block *sb)
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{
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struct proc_inode *ei;
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struct inode *inode;
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ei = kmem_cache_alloc(proc_inode_cachep, GFP_KERNEL);
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if (!ei)
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return NULL;
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ei->pid = NULL;
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ei->fd = 0;
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ei->op.proc_get_link = NULL;
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ei->pde = NULL;
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ei->sysctl = NULL;
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ei->sysctl_entry = NULL;
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ei->ns_ops = NULL;
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inode = &ei->vfs_inode;
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return inode;
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}
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static void proc_i_callback(struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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kmem_cache_free(proc_inode_cachep, PROC_I(inode));
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}
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static void proc_destroy_inode(struct inode *inode)
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{
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call_rcu(&inode->i_rcu, proc_i_callback);
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}
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static void init_once(void *foo)
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{
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struct proc_inode *ei = (struct proc_inode *) foo;
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inode_init_once(&ei->vfs_inode);
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}
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void __init proc_init_inodecache(void)
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{
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proc_inode_cachep = kmem_cache_create("proc_inode_cache",
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sizeof(struct proc_inode),
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0, (SLAB_RECLAIM_ACCOUNT|
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SLAB_MEM_SPREAD|SLAB_ACCOUNT|
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SLAB_PANIC),
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init_once);
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}
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static int proc_show_options(struct seq_file *seq, struct dentry *root)
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{
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struct super_block *sb = root->d_sb;
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struct pid_namespace *pid = sb->s_fs_info;
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if (!gid_eq(pid->pid_gid, GLOBAL_ROOT_GID))
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seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, pid->pid_gid));
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if (pid->hide_pid != HIDEPID_OFF)
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seq_printf(seq, ",hidepid=%u", pid->hide_pid);
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return 0;
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}
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static const struct super_operations proc_sops = {
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.alloc_inode = proc_alloc_inode,
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.destroy_inode = proc_destroy_inode,
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.drop_inode = generic_delete_inode,
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.evict_inode = proc_evict_inode,
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.statfs = simple_statfs,
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.remount_fs = proc_remount,
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.show_options = proc_show_options,
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};
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enum {BIAS = -1U<<31};
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static inline int use_pde(struct proc_dir_entry *pde)
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{
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return atomic_inc_unless_negative(&pde->in_use);
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}
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static void unuse_pde(struct proc_dir_entry *pde)
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{
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if (atomic_dec_return(&pde->in_use) == BIAS)
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complete(pde->pde_unload_completion);
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}
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/* pde is locked */
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static void close_pdeo(struct proc_dir_entry *pde, struct pde_opener *pdeo)
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{
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/*
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* close() (proc_reg_release()) can't delete an entry and proceed:
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* ->release hook needs to be available at the right moment.
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*
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* rmmod (remove_proc_entry() et al) can't delete an entry and proceed:
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* "struct file" needs to be available at the right moment.
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*
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* Therefore, first process to enter this function does ->release() and
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* signals its completion to the other process which does nothing.
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*/
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if (pdeo->closing) {
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/* somebody else is doing that, just wait */
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DECLARE_COMPLETION_ONSTACK(c);
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pdeo->c = &c;
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spin_unlock(&pde->pde_unload_lock);
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wait_for_completion(&c);
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spin_lock(&pde->pde_unload_lock);
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} else {
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struct file *file;
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pdeo->closing = true;
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spin_unlock(&pde->pde_unload_lock);
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file = pdeo->file;
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pde->proc_fops->release(file_inode(file), file);
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spin_lock(&pde->pde_unload_lock);
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/* After ->release. */
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list_del(&pdeo->lh);
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if (pdeo->c)
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complete(pdeo->c);
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kfree(pdeo);
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}
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}
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void proc_entry_rundown(struct proc_dir_entry *de)
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{
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DECLARE_COMPLETION_ONSTACK(c);
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/* Wait until all existing callers into module are done. */
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de->pde_unload_completion = &c;
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if (atomic_add_return(BIAS, &de->in_use) != BIAS)
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wait_for_completion(&c);
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/* ->pde_openers list can't grow from now on. */
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spin_lock(&de->pde_unload_lock);
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while (!list_empty(&de->pde_openers)) {
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struct pde_opener *pdeo;
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pdeo = list_first_entry(&de->pde_openers, struct pde_opener, lh);
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close_pdeo(de, pdeo);
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}
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spin_unlock(&de->pde_unload_lock);
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}
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static loff_t proc_reg_llseek(struct file *file, loff_t offset, int whence)
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{
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struct proc_dir_entry *pde = PDE(file_inode(file));
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loff_t rv = -EINVAL;
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if (use_pde(pde)) {
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loff_t (*llseek)(struct file *, loff_t, int);
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llseek = pde->proc_fops->llseek;
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if (!llseek)
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llseek = default_llseek;
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rv = llseek(file, offset, whence);
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unuse_pde(pde);
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}
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return rv;
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}
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static ssize_t proc_reg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
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{
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ssize_t (*read)(struct file *, char __user *, size_t, loff_t *);
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struct proc_dir_entry *pde = PDE(file_inode(file));
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ssize_t rv = -EIO;
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if (use_pde(pde)) {
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read = pde->proc_fops->read;
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if (read)
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rv = read(file, buf, count, ppos);
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unuse_pde(pde);
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}
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return rv;
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}
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static ssize_t proc_reg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
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{
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ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);
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struct proc_dir_entry *pde = PDE(file_inode(file));
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ssize_t rv = -EIO;
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if (use_pde(pde)) {
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write = pde->proc_fops->write;
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if (write)
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rv = write(file, buf, count, ppos);
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unuse_pde(pde);
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}
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return rv;
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}
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static unsigned int proc_reg_poll(struct file *file, struct poll_table_struct *pts)
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{
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struct proc_dir_entry *pde = PDE(file_inode(file));
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unsigned int rv = DEFAULT_POLLMASK;
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unsigned int (*poll)(struct file *, struct poll_table_struct *);
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if (use_pde(pde)) {
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poll = pde->proc_fops->poll;
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if (poll)
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rv = poll(file, pts);
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unuse_pde(pde);
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}
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return rv;
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}
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static long proc_reg_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct proc_dir_entry *pde = PDE(file_inode(file));
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long rv = -ENOTTY;
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long (*ioctl)(struct file *, unsigned int, unsigned long);
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if (use_pde(pde)) {
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ioctl = pde->proc_fops->unlocked_ioctl;
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if (ioctl)
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rv = ioctl(file, cmd, arg);
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unuse_pde(pde);
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}
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return rv;
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}
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#ifdef CONFIG_COMPAT
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static long proc_reg_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct proc_dir_entry *pde = PDE(file_inode(file));
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long rv = -ENOTTY;
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long (*compat_ioctl)(struct file *, unsigned int, unsigned long);
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if (use_pde(pde)) {
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compat_ioctl = pde->proc_fops->compat_ioctl;
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if (compat_ioctl)
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rv = compat_ioctl(file, cmd, arg);
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unuse_pde(pde);
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}
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return rv;
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}
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#endif
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static int proc_reg_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct proc_dir_entry *pde = PDE(file_inode(file));
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int rv = -EIO;
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int (*mmap)(struct file *, struct vm_area_struct *);
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if (use_pde(pde)) {
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mmap = pde->proc_fops->mmap;
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if (mmap)
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rv = mmap(file, vma);
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unuse_pde(pde);
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}
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return rv;
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}
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static unsigned long
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proc_reg_get_unmapped_area(struct file *file, unsigned long orig_addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags)
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{
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struct proc_dir_entry *pde = PDE(file_inode(file));
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unsigned long rv = -EIO;
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if (use_pde(pde)) {
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typeof(proc_reg_get_unmapped_area) *get_area;
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get_area = pde->proc_fops->get_unmapped_area;
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#ifdef CONFIG_MMU
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if (!get_area)
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get_area = current->mm->get_unmapped_area;
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#endif
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if (get_area)
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rv = get_area(file, orig_addr, len, pgoff, flags);
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else
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rv = orig_addr;
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unuse_pde(pde);
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}
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return rv;
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}
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static int proc_reg_open(struct inode *inode, struct file *file)
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{
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struct proc_dir_entry *pde = PDE(inode);
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int rv = 0;
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int (*open)(struct inode *, struct file *);
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int (*release)(struct inode *, struct file *);
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struct pde_opener *pdeo;
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/*
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* Ensure that
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* 1) PDE's ->release hook will be called no matter what
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* either normally by close()/->release, or forcefully by
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* rmmod/remove_proc_entry.
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*
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* 2) rmmod isn't blocked by opening file in /proc and sitting on
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* the descriptor (including "rmmod foo </proc/foo" scenario).
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*
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* Save every "struct file" with custom ->release hook.
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*/
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pdeo = kmalloc(sizeof(struct pde_opener), GFP_KERNEL);
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if (!pdeo)
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return -ENOMEM;
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if (!use_pde(pde)) {
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kfree(pdeo);
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return -ENOENT;
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}
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open = pde->proc_fops->open;
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release = pde->proc_fops->release;
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if (open)
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rv = open(inode, file);
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if (rv == 0 && release) {
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/* To know what to release. */
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pdeo->file = file;
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pdeo->closing = false;
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pdeo->c = NULL;
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spin_lock(&pde->pde_unload_lock);
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list_add(&pdeo->lh, &pde->pde_openers);
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spin_unlock(&pde->pde_unload_lock);
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} else
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kfree(pdeo);
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unuse_pde(pde);
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return rv;
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}
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static int proc_reg_release(struct inode *inode, struct file *file)
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{
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struct proc_dir_entry *pde = PDE(inode);
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struct pde_opener *pdeo;
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spin_lock(&pde->pde_unload_lock);
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list_for_each_entry(pdeo, &pde->pde_openers, lh) {
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if (pdeo->file == file) {
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close_pdeo(pde, pdeo);
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break;
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}
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}
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spin_unlock(&pde->pde_unload_lock);
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return 0;
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}
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static const struct file_operations proc_reg_file_ops = {
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.llseek = proc_reg_llseek,
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.read = proc_reg_read,
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.write = proc_reg_write,
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.poll = proc_reg_poll,
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.unlocked_ioctl = proc_reg_unlocked_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = proc_reg_compat_ioctl,
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#endif
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.mmap = proc_reg_mmap,
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.get_unmapped_area = proc_reg_get_unmapped_area,
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.open = proc_reg_open,
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.release = proc_reg_release,
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};
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#ifdef CONFIG_COMPAT
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static const struct file_operations proc_reg_file_ops_no_compat = {
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.llseek = proc_reg_llseek,
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.read = proc_reg_read,
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.write = proc_reg_write,
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.poll = proc_reg_poll,
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.unlocked_ioctl = proc_reg_unlocked_ioctl,
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.mmap = proc_reg_mmap,
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.get_unmapped_area = proc_reg_get_unmapped_area,
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.open = proc_reg_open,
|
|
.release = proc_reg_release,
|
|
};
|
|
#endif
|
|
|
|
static void proc_put_link(void *p)
|
|
{
|
|
unuse_pde(p);
|
|
}
|
|
|
|
static const char *proc_get_link(struct dentry *dentry,
|
|
struct inode *inode,
|
|
struct delayed_call *done)
|
|
{
|
|
struct proc_dir_entry *pde = PDE(inode);
|
|
if (unlikely(!use_pde(pde)))
|
|
return ERR_PTR(-EINVAL);
|
|
set_delayed_call(done, proc_put_link, pde);
|
|
return pde->data;
|
|
}
|
|
|
|
const struct inode_operations proc_link_inode_operations = {
|
|
.get_link = proc_get_link,
|
|
};
|
|
|
|
struct inode *proc_get_inode(struct super_block *sb, struct proc_dir_entry *de)
|
|
{
|
|
struct inode *inode = new_inode_pseudo(sb);
|
|
|
|
if (inode) {
|
|
inode->i_ino = de->low_ino;
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
|
|
PROC_I(inode)->pde = de;
|
|
|
|
if (is_empty_pde(de)) {
|
|
make_empty_dir_inode(inode);
|
|
return inode;
|
|
}
|
|
if (de->mode) {
|
|
inode->i_mode = de->mode;
|
|
inode->i_uid = de->uid;
|
|
inode->i_gid = de->gid;
|
|
}
|
|
if (de->size)
|
|
inode->i_size = de->size;
|
|
if (de->nlink)
|
|
set_nlink(inode, de->nlink);
|
|
WARN_ON(!de->proc_iops);
|
|
inode->i_op = de->proc_iops;
|
|
if (de->proc_fops) {
|
|
if (S_ISREG(inode->i_mode)) {
|
|
#ifdef CONFIG_COMPAT
|
|
if (!de->proc_fops->compat_ioctl)
|
|
inode->i_fop =
|
|
&proc_reg_file_ops_no_compat;
|
|
else
|
|
#endif
|
|
inode->i_fop = &proc_reg_file_ops;
|
|
} else {
|
|
inode->i_fop = de->proc_fops;
|
|
}
|
|
}
|
|
} else
|
|
pde_put(de);
|
|
return inode;
|
|
}
|
|
|
|
int proc_fill_super(struct super_block *s, void *data, int silent)
|
|
{
|
|
struct pid_namespace *ns = get_pid_ns(s->s_fs_info);
|
|
struct inode *root_inode;
|
|
int ret;
|
|
|
|
if (!proc_parse_options(data, ns))
|
|
return -EINVAL;
|
|
|
|
/* User space would break if executables or devices appear on proc */
|
|
s->s_iflags |= SB_I_USERNS_VISIBLE | SB_I_NOEXEC | SB_I_NODEV;
|
|
s->s_flags |= MS_NODIRATIME | MS_NOSUID | MS_NOEXEC;
|
|
s->s_blocksize = 1024;
|
|
s->s_blocksize_bits = 10;
|
|
s->s_magic = PROC_SUPER_MAGIC;
|
|
s->s_op = &proc_sops;
|
|
s->s_time_gran = 1;
|
|
|
|
/*
|
|
* procfs isn't actually a stacking filesystem; however, there is
|
|
* too much magic going on inside it to permit stacking things on
|
|
* top of it
|
|
*/
|
|
s->s_stack_depth = FILESYSTEM_MAX_STACK_DEPTH;
|
|
|
|
pde_get(&proc_root);
|
|
root_inode = proc_get_inode(s, &proc_root);
|
|
if (!root_inode) {
|
|
pr_err("proc_fill_super: get root inode failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
s->s_root = d_make_root(root_inode);
|
|
if (!s->s_root) {
|
|
pr_err("proc_fill_super: allocate dentry failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = proc_setup_self(s);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
return proc_setup_thread_self(s);
|
|
}
|