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b24413180f
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>
331 lines
7.9 KiB
C
331 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* security/tomoyo/realpath.c
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*
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* Copyright (C) 2005-2011 NTT DATA CORPORATION
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*/
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#include "common.h"
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#include <linux/magic.h>
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/**
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* tomoyo_encode2 - Encode binary string to ascii string.
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*
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* @str: String in binary format.
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* @str_len: Size of @str in byte.
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*
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* Returns pointer to @str in ascii format on success, NULL otherwise.
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*
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* This function uses kzalloc(), so caller must kfree() if this function
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* didn't return NULL.
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*/
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char *tomoyo_encode2(const char *str, int str_len)
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{
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int i;
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int len = 0;
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const char *p = str;
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char *cp;
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char *cp0;
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if (!p)
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return NULL;
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for (i = 0; i < str_len; i++) {
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const unsigned char c = p[i];
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if (c == '\\')
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len += 2;
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else if (c > ' ' && c < 127)
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len++;
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else
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len += 4;
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}
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len++;
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/* Reserve space for appending "/". */
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cp = kzalloc(len + 10, GFP_NOFS);
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if (!cp)
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return NULL;
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cp0 = cp;
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p = str;
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for (i = 0; i < str_len; i++) {
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const unsigned char c = p[i];
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if (c == '\\') {
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*cp++ = '\\';
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*cp++ = '\\';
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} else if (c > ' ' && c < 127) {
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*cp++ = c;
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} else {
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*cp++ = '\\';
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*cp++ = (c >> 6) + '0';
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*cp++ = ((c >> 3) & 7) + '0';
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*cp++ = (c & 7) + '0';
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}
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}
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return cp0;
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}
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/**
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* tomoyo_encode - Encode binary string to ascii string.
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*
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* @str: String in binary format.
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*
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* Returns pointer to @str in ascii format on success, NULL otherwise.
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*
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* This function uses kzalloc(), so caller must kfree() if this function
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* didn't return NULL.
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*/
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char *tomoyo_encode(const char *str)
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{
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return str ? tomoyo_encode2(str, strlen(str)) : NULL;
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}
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/**
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* tomoyo_get_absolute_path - Get the path of a dentry but ignores chroot'ed root.
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*
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* @path: Pointer to "struct path".
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* @buffer: Pointer to buffer to return value in.
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* @buflen: Sizeof @buffer.
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*
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* Returns the buffer on success, an error code otherwise.
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*
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* If dentry is a directory, trailing '/' is appended.
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*/
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static char *tomoyo_get_absolute_path(const struct path *path, char * const buffer,
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const int buflen)
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{
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char *pos = ERR_PTR(-ENOMEM);
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if (buflen >= 256) {
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/* go to whatever namespace root we are under */
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pos = d_absolute_path(path, buffer, buflen - 1);
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if (!IS_ERR(pos) && *pos == '/' && pos[1]) {
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struct inode *inode = d_backing_inode(path->dentry);
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if (inode && S_ISDIR(inode->i_mode)) {
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buffer[buflen - 2] = '/';
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buffer[buflen - 1] = '\0';
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}
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}
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}
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return pos;
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}
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/**
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* tomoyo_get_dentry_path - Get the path of a dentry.
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*
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* @dentry: Pointer to "struct dentry".
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* @buffer: Pointer to buffer to return value in.
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* @buflen: Sizeof @buffer.
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*
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* Returns the buffer on success, an error code otherwise.
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*
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* If dentry is a directory, trailing '/' is appended.
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*/
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static char *tomoyo_get_dentry_path(struct dentry *dentry, char * const buffer,
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const int buflen)
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{
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char *pos = ERR_PTR(-ENOMEM);
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if (buflen >= 256) {
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pos = dentry_path_raw(dentry, buffer, buflen - 1);
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if (!IS_ERR(pos) && *pos == '/' && pos[1]) {
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struct inode *inode = d_backing_inode(dentry);
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if (inode && S_ISDIR(inode->i_mode)) {
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buffer[buflen - 2] = '/';
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buffer[buflen - 1] = '\0';
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}
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}
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}
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return pos;
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}
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/**
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* tomoyo_get_local_path - Get the path of a dentry.
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*
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* @dentry: Pointer to "struct dentry".
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* @buffer: Pointer to buffer to return value in.
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* @buflen: Sizeof @buffer.
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*
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* Returns the buffer on success, an error code otherwise.
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*/
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static char *tomoyo_get_local_path(struct dentry *dentry, char * const buffer,
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const int buflen)
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{
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struct super_block *sb = dentry->d_sb;
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char *pos = tomoyo_get_dentry_path(dentry, buffer, buflen);
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if (IS_ERR(pos))
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return pos;
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/* Convert from $PID to self if $PID is current thread. */
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if (sb->s_magic == PROC_SUPER_MAGIC && *pos == '/') {
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char *ep;
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const pid_t pid = (pid_t) simple_strtoul(pos + 1, &ep, 10);
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if (*ep == '/' && pid && pid ==
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task_tgid_nr_ns(current, sb->s_fs_info)) {
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pos = ep - 5;
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if (pos < buffer)
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goto out;
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memmove(pos, "/self", 5);
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}
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goto prepend_filesystem_name;
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}
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/* Use filesystem name for unnamed devices. */
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if (!MAJOR(sb->s_dev))
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goto prepend_filesystem_name;
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{
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struct inode *inode = d_backing_inode(sb->s_root);
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/*
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* Use filesystem name if filesystem does not support rename()
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* operation.
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*/
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if (!inode->i_op->rename)
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goto prepend_filesystem_name;
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}
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/* Prepend device name. */
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{
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char name[64];
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int name_len;
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const dev_t dev = sb->s_dev;
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name[sizeof(name) - 1] = '\0';
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snprintf(name, sizeof(name) - 1, "dev(%u,%u):", MAJOR(dev),
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MINOR(dev));
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name_len = strlen(name);
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pos -= name_len;
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if (pos < buffer)
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goto out;
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memmove(pos, name, name_len);
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return pos;
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}
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/* Prepend filesystem name. */
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prepend_filesystem_name:
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{
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const char *name = sb->s_type->name;
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const int name_len = strlen(name);
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pos -= name_len + 1;
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if (pos < buffer)
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goto out;
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memmove(pos, name, name_len);
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pos[name_len] = ':';
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}
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return pos;
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out:
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return ERR_PTR(-ENOMEM);
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}
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/**
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* tomoyo_get_socket_name - Get the name of a socket.
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*
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* @path: Pointer to "struct path".
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* @buffer: Pointer to buffer to return value in.
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* @buflen: Sizeof @buffer.
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*
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* Returns the buffer.
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*/
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static char *tomoyo_get_socket_name(const struct path *path, char * const buffer,
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const int buflen)
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{
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struct inode *inode = d_backing_inode(path->dentry);
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struct socket *sock = inode ? SOCKET_I(inode) : NULL;
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struct sock *sk = sock ? sock->sk : NULL;
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if (sk) {
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snprintf(buffer, buflen, "socket:[family=%u:type=%u:"
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"protocol=%u]", sk->sk_family, sk->sk_type,
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sk->sk_protocol);
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} else {
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snprintf(buffer, buflen, "socket:[unknown]");
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}
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return buffer;
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}
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/**
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* tomoyo_realpath_from_path - Returns realpath(3) of the given pathname but ignores chroot'ed root.
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*
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* @path: Pointer to "struct path".
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*
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* Returns the realpath of the given @path on success, NULL otherwise.
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*
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* If dentry is a directory, trailing '/' is appended.
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* Characters out of 0x20 < c < 0x7F range are converted to
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* \ooo style octal string.
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* Character \ is converted to \\ string.
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*
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* These functions use kzalloc(), so the caller must call kfree()
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* if these functions didn't return NULL.
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*/
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char *tomoyo_realpath_from_path(const struct path *path)
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{
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char *buf = NULL;
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char *name = NULL;
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unsigned int buf_len = PAGE_SIZE / 2;
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struct dentry *dentry = path->dentry;
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struct super_block *sb;
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if (!dentry)
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return NULL;
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sb = dentry->d_sb;
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while (1) {
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char *pos;
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struct inode *inode;
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buf_len <<= 1;
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kfree(buf);
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buf = kmalloc(buf_len, GFP_NOFS);
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if (!buf)
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break;
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/* To make sure that pos is '\0' terminated. */
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buf[buf_len - 1] = '\0';
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/* Get better name for socket. */
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if (sb->s_magic == SOCKFS_MAGIC) {
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pos = tomoyo_get_socket_name(path, buf, buf_len - 1);
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goto encode;
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}
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/* For "pipe:[\$]". */
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if (dentry->d_op && dentry->d_op->d_dname) {
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pos = dentry->d_op->d_dname(dentry, buf, buf_len - 1);
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goto encode;
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}
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inode = d_backing_inode(sb->s_root);
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/*
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* Get local name for filesystems without rename() operation
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* or dentry without vfsmount.
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*/
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if (!path->mnt ||
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(!inode->i_op->rename))
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pos = tomoyo_get_local_path(path->dentry, buf,
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buf_len - 1);
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/* Get absolute name for the rest. */
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else {
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pos = tomoyo_get_absolute_path(path, buf, buf_len - 1);
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/*
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* Fall back to local name if absolute name is not
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* available.
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*/
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if (pos == ERR_PTR(-EINVAL))
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pos = tomoyo_get_local_path(path->dentry, buf,
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buf_len - 1);
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}
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encode:
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if (IS_ERR(pos))
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continue;
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name = tomoyo_encode(pos);
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break;
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}
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kfree(buf);
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if (!name)
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tomoyo_warn_oom(__func__);
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return name;
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}
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/**
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* tomoyo_realpath_nofollow - Get realpath of a pathname.
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*
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* @pathname: The pathname to solve.
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*
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* Returns the realpath of @pathname on success, NULL otherwise.
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*/
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char *tomoyo_realpath_nofollow(const char *pathname)
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{
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struct path path;
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if (pathname && kern_path(pathname, 0, &path) == 0) {
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char *buf = tomoyo_realpath_from_path(&path);
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path_put(&path);
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return buf;
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}
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return NULL;
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}
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