![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>
666 lines
14 KiB
C
666 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Many of the syscalls used in this file expect some of the arguments
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* to be __user pointers not __kernel pointers. To limit the sparse
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* noise, turn off sparse checking for this file.
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*/
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#ifdef __CHECKER__
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#undef __CHECKER__
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#warning "Sparse checking disabled for this file"
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#endif
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/delay.h>
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#include <linux/string.h>
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#include <linux/dirent.h>
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#include <linux/syscalls.h>
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#include <linux/utime.h>
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#include <linux/file.h>
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static ssize_t __init xwrite(int fd, const char *p, size_t count)
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{
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ssize_t out = 0;
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/* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */
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while (count) {
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ssize_t rv = sys_write(fd, p, count);
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if (rv < 0) {
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if (rv == -EINTR || rv == -EAGAIN)
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continue;
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return out ? out : rv;
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} else if (rv == 0)
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break;
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p += rv;
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out += rv;
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count -= rv;
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}
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return out;
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}
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static __initdata char *message;
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static void __init error(char *x)
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{
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if (!message)
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message = x;
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}
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/* link hash */
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#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
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static __initdata struct hash {
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int ino, minor, major;
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umode_t mode;
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struct hash *next;
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char name[N_ALIGN(PATH_MAX)];
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} *head[32];
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static inline int hash(int major, int minor, int ino)
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{
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unsigned long tmp = ino + minor + (major << 3);
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tmp += tmp >> 5;
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return tmp & 31;
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}
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static char __init *find_link(int major, int minor, int ino,
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umode_t mode, char *name)
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{
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struct hash **p, *q;
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for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
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if ((*p)->ino != ino)
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continue;
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if ((*p)->minor != minor)
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continue;
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if ((*p)->major != major)
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continue;
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if (((*p)->mode ^ mode) & S_IFMT)
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continue;
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return (*p)->name;
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}
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q = kmalloc(sizeof(struct hash), GFP_KERNEL);
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if (!q)
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panic("can't allocate link hash entry");
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q->major = major;
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q->minor = minor;
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q->ino = ino;
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q->mode = mode;
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strcpy(q->name, name);
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q->next = NULL;
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*p = q;
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return NULL;
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}
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static void __init free_hash(void)
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{
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struct hash **p, *q;
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for (p = head; p < head + 32; p++) {
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while (*p) {
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q = *p;
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*p = q->next;
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kfree(q);
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}
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}
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}
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static long __init do_utime(char *filename, time_t mtime)
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{
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struct timespec64 t[2];
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t[0].tv_sec = mtime;
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t[0].tv_nsec = 0;
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t[1].tv_sec = mtime;
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t[1].tv_nsec = 0;
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return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW);
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}
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static __initdata LIST_HEAD(dir_list);
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struct dir_entry {
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struct list_head list;
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char *name;
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time_t mtime;
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};
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static void __init dir_add(const char *name, time_t mtime)
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{
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struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL);
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if (!de)
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panic("can't allocate dir_entry buffer");
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INIT_LIST_HEAD(&de->list);
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de->name = kstrdup(name, GFP_KERNEL);
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de->mtime = mtime;
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list_add(&de->list, &dir_list);
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}
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static void __init dir_utime(void)
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{
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struct dir_entry *de, *tmp;
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list_for_each_entry_safe(de, tmp, &dir_list, list) {
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list_del(&de->list);
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do_utime(de->name, de->mtime);
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kfree(de->name);
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kfree(de);
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}
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}
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static __initdata time_t mtime;
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/* cpio header parsing */
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static __initdata unsigned long ino, major, minor, nlink;
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static __initdata umode_t mode;
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static __initdata unsigned long body_len, name_len;
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static __initdata uid_t uid;
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static __initdata gid_t gid;
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static __initdata unsigned rdev;
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static void __init parse_header(char *s)
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{
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unsigned long parsed[12];
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char buf[9];
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int i;
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buf[8] = '\0';
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for (i = 0, s += 6; i < 12; i++, s += 8) {
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memcpy(buf, s, 8);
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parsed[i] = simple_strtoul(buf, NULL, 16);
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}
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ino = parsed[0];
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mode = parsed[1];
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uid = parsed[2];
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gid = parsed[3];
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nlink = parsed[4];
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mtime = parsed[5];
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body_len = parsed[6];
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major = parsed[7];
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minor = parsed[8];
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rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
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name_len = parsed[11];
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}
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/* FSM */
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static __initdata enum state {
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Start,
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Collect,
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GotHeader,
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SkipIt,
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GotName,
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CopyFile,
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GotSymlink,
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Reset
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} state, next_state;
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static __initdata char *victim;
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static unsigned long byte_count __initdata;
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static __initdata loff_t this_header, next_header;
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static inline void __init eat(unsigned n)
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{
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victim += n;
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this_header += n;
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byte_count -= n;
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}
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static __initdata char *vcollected;
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static __initdata char *collected;
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static long remains __initdata;
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static __initdata char *collect;
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static void __init read_into(char *buf, unsigned size, enum state next)
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{
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if (byte_count >= size) {
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collected = victim;
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eat(size);
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state = next;
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} else {
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collect = collected = buf;
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remains = size;
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next_state = next;
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state = Collect;
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}
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}
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static __initdata char *header_buf, *symlink_buf, *name_buf;
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static int __init do_start(void)
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{
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read_into(header_buf, 110, GotHeader);
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return 0;
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}
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static int __init do_collect(void)
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{
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unsigned long n = remains;
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if (byte_count < n)
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n = byte_count;
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memcpy(collect, victim, n);
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eat(n);
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collect += n;
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if ((remains -= n) != 0)
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return 1;
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state = next_state;
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return 0;
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}
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static int __init do_header(void)
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{
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if (memcmp(collected, "070707", 6)==0) {
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error("incorrect cpio method used: use -H newc option");
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return 1;
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}
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if (memcmp(collected, "070701", 6)) {
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error("no cpio magic");
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return 1;
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}
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parse_header(collected);
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next_header = this_header + N_ALIGN(name_len) + body_len;
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next_header = (next_header + 3) & ~3;
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state = SkipIt;
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if (name_len <= 0 || name_len > PATH_MAX)
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return 0;
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if (S_ISLNK(mode)) {
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if (body_len > PATH_MAX)
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return 0;
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collect = collected = symlink_buf;
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remains = N_ALIGN(name_len) + body_len;
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next_state = GotSymlink;
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state = Collect;
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return 0;
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}
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if (S_ISREG(mode) || !body_len)
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read_into(name_buf, N_ALIGN(name_len), GotName);
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return 0;
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}
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static int __init do_skip(void)
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{
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if (this_header + byte_count < next_header) {
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eat(byte_count);
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return 1;
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} else {
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eat(next_header - this_header);
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state = next_state;
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return 0;
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}
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}
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static int __init do_reset(void)
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{
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while (byte_count && *victim == '\0')
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eat(1);
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if (byte_count && (this_header & 3))
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error("broken padding");
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return 1;
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}
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static int __init maybe_link(void)
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{
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if (nlink >= 2) {
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char *old = find_link(major, minor, ino, mode, collected);
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if (old)
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return (sys_link(old, collected) < 0) ? -1 : 1;
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}
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return 0;
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}
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static void __init clean_path(char *path, umode_t fmode)
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{
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struct kstat st;
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if (!vfs_lstat(path, &st) && (st.mode ^ fmode) & S_IFMT) {
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if (S_ISDIR(st.mode))
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sys_rmdir(path);
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else
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sys_unlink(path);
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}
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}
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static __initdata int wfd;
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static int __init do_name(void)
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{
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state = SkipIt;
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next_state = Reset;
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if (strcmp(collected, "TRAILER!!!") == 0) {
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free_hash();
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return 0;
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}
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clean_path(collected, mode);
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if (S_ISREG(mode)) {
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int ml = maybe_link();
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if (ml >= 0) {
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int openflags = O_WRONLY|O_CREAT;
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if (ml != 1)
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openflags |= O_TRUNC;
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wfd = sys_open(collected, openflags, mode);
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if (wfd >= 0) {
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sys_fchown(wfd, uid, gid);
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sys_fchmod(wfd, mode);
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if (body_len)
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sys_ftruncate(wfd, body_len);
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vcollected = kstrdup(collected, GFP_KERNEL);
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state = CopyFile;
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}
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}
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} else if (S_ISDIR(mode)) {
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sys_mkdir(collected, mode);
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sys_chown(collected, uid, gid);
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sys_chmod(collected, mode);
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dir_add(collected, mtime);
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} else if (S_ISBLK(mode) || S_ISCHR(mode) ||
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S_ISFIFO(mode) || S_ISSOCK(mode)) {
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if (maybe_link() == 0) {
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sys_mknod(collected, mode, rdev);
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sys_chown(collected, uid, gid);
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sys_chmod(collected, mode);
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do_utime(collected, mtime);
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}
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}
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return 0;
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}
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static int __init do_copy(void)
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{
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if (byte_count >= body_len) {
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if (xwrite(wfd, victim, body_len) != body_len)
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error("write error");
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sys_close(wfd);
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do_utime(vcollected, mtime);
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kfree(vcollected);
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eat(body_len);
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state = SkipIt;
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return 0;
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} else {
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if (xwrite(wfd, victim, byte_count) != byte_count)
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error("write error");
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body_len -= byte_count;
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eat(byte_count);
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return 1;
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}
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}
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static int __init do_symlink(void)
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{
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collected[N_ALIGN(name_len) + body_len] = '\0';
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clean_path(collected, 0);
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sys_symlink(collected + N_ALIGN(name_len), collected);
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sys_lchown(collected, uid, gid);
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do_utime(collected, mtime);
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state = SkipIt;
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next_state = Reset;
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return 0;
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}
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static __initdata int (*actions[])(void) = {
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[Start] = do_start,
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[Collect] = do_collect,
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[GotHeader] = do_header,
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[SkipIt] = do_skip,
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[GotName] = do_name,
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[CopyFile] = do_copy,
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[GotSymlink] = do_symlink,
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[Reset] = do_reset,
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};
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static long __init write_buffer(char *buf, unsigned long len)
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{
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byte_count = len;
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victim = buf;
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while (!actions[state]())
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;
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return len - byte_count;
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}
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static long __init flush_buffer(void *bufv, unsigned long len)
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{
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char *buf = (char *) bufv;
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long written;
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long origLen = len;
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if (message)
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return -1;
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while ((written = write_buffer(buf, len)) < len && !message) {
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char c = buf[written];
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if (c == '0') {
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buf += written;
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len -= written;
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state = Start;
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} else if (c == 0) {
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buf += written;
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len -= written;
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state = Reset;
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} else
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error("junk in compressed archive");
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}
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return origLen;
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}
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static unsigned long my_inptr; /* index of next byte to be processed in inbuf */
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#include <linux/decompress/generic.h>
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static char * __init unpack_to_rootfs(char *buf, unsigned long len)
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{
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long written;
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decompress_fn decompress;
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const char *compress_name;
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static __initdata char msg_buf[64];
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header_buf = kmalloc(110, GFP_KERNEL);
|
|
symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
|
|
name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
|
|
|
|
if (!header_buf || !symlink_buf || !name_buf)
|
|
panic("can't allocate buffers");
|
|
|
|
state = Start;
|
|
this_header = 0;
|
|
message = NULL;
|
|
while (!message && len) {
|
|
loff_t saved_offset = this_header;
|
|
if (*buf == '0' && !(this_header & 3)) {
|
|
state = Start;
|
|
written = write_buffer(buf, len);
|
|
buf += written;
|
|
len -= written;
|
|
continue;
|
|
}
|
|
if (!*buf) {
|
|
buf++;
|
|
len--;
|
|
this_header++;
|
|
continue;
|
|
}
|
|
this_header = 0;
|
|
decompress = decompress_method(buf, len, &compress_name);
|
|
pr_debug("Detected %s compressed data\n", compress_name);
|
|
if (decompress) {
|
|
int res = decompress(buf, len, NULL, flush_buffer, NULL,
|
|
&my_inptr, error);
|
|
if (res)
|
|
error("decompressor failed");
|
|
} else if (compress_name) {
|
|
if (!message) {
|
|
snprintf(msg_buf, sizeof msg_buf,
|
|
"compression method %s not configured",
|
|
compress_name);
|
|
message = msg_buf;
|
|
}
|
|
} else
|
|
error("junk in compressed archive");
|
|
if (state != Reset)
|
|
error("junk in compressed archive");
|
|
this_header = saved_offset + my_inptr;
|
|
buf += my_inptr;
|
|
len -= my_inptr;
|
|
}
|
|
dir_utime();
|
|
kfree(name_buf);
|
|
kfree(symlink_buf);
|
|
kfree(header_buf);
|
|
return message;
|
|
}
|
|
|
|
static int __initdata do_retain_initrd;
|
|
|
|
static int __init retain_initrd_param(char *str)
|
|
{
|
|
if (*str)
|
|
return 0;
|
|
do_retain_initrd = 1;
|
|
return 1;
|
|
}
|
|
__setup("retain_initrd", retain_initrd_param);
|
|
|
|
extern char __initramfs_start[];
|
|
extern unsigned long __initramfs_size;
|
|
#include <linux/initrd.h>
|
|
#include <linux/kexec.h>
|
|
|
|
static void __init free_initrd(void)
|
|
{
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
|
|
unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
|
|
#endif
|
|
if (do_retain_initrd)
|
|
goto skip;
|
|
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
/*
|
|
* If the initrd region is overlapped with crashkernel reserved region,
|
|
* free only memory that is not part of crashkernel region.
|
|
*/
|
|
if (initrd_start < crashk_end && initrd_end > crashk_start) {
|
|
/*
|
|
* Initialize initrd memory region since the kexec boot does
|
|
* not do.
|
|
*/
|
|
memset((void *)initrd_start, 0, initrd_end - initrd_start);
|
|
if (initrd_start < crashk_start)
|
|
free_initrd_mem(initrd_start, crashk_start);
|
|
if (initrd_end > crashk_end)
|
|
free_initrd_mem(crashk_end, initrd_end);
|
|
} else
|
|
#endif
|
|
free_initrd_mem(initrd_start, initrd_end);
|
|
skip:
|
|
initrd_start = 0;
|
|
initrd_end = 0;
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_RAM
|
|
#define BUF_SIZE 1024
|
|
static void __init clean_rootfs(void)
|
|
{
|
|
int fd;
|
|
void *buf;
|
|
struct linux_dirent64 *dirp;
|
|
int num;
|
|
|
|
fd = sys_open("/", O_RDONLY, 0);
|
|
WARN_ON(fd < 0);
|
|
if (fd < 0)
|
|
return;
|
|
buf = kzalloc(BUF_SIZE, GFP_KERNEL);
|
|
WARN_ON(!buf);
|
|
if (!buf) {
|
|
sys_close(fd);
|
|
return;
|
|
}
|
|
|
|
dirp = buf;
|
|
num = sys_getdents64(fd, dirp, BUF_SIZE);
|
|
while (num > 0) {
|
|
while (num > 0) {
|
|
struct kstat st;
|
|
int ret;
|
|
|
|
ret = vfs_lstat(dirp->d_name, &st);
|
|
WARN_ON_ONCE(ret);
|
|
if (!ret) {
|
|
if (S_ISDIR(st.mode))
|
|
sys_rmdir(dirp->d_name);
|
|
else
|
|
sys_unlink(dirp->d_name);
|
|
}
|
|
|
|
num -= dirp->d_reclen;
|
|
dirp = (void *)dirp + dirp->d_reclen;
|
|
}
|
|
dirp = buf;
|
|
memset(buf, 0, BUF_SIZE);
|
|
num = sys_getdents64(fd, dirp, BUF_SIZE);
|
|
}
|
|
|
|
sys_close(fd);
|
|
kfree(buf);
|
|
}
|
|
#endif
|
|
|
|
static int __init populate_rootfs(void)
|
|
{
|
|
/* Load the built in initramfs */
|
|
char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
|
|
if (err)
|
|
panic("%s", err); /* Failed to decompress INTERNAL initramfs */
|
|
/* If available load the bootloader supplied initrd */
|
|
if (initrd_start && !IS_ENABLED(CONFIG_INITRAMFS_FORCE)) {
|
|
#ifdef CONFIG_BLK_DEV_RAM
|
|
int fd;
|
|
printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
|
|
err = unpack_to_rootfs((char *)initrd_start,
|
|
initrd_end - initrd_start);
|
|
if (!err) {
|
|
free_initrd();
|
|
goto done;
|
|
} else {
|
|
clean_rootfs();
|
|
unpack_to_rootfs(__initramfs_start, __initramfs_size);
|
|
}
|
|
printk(KERN_INFO "rootfs image is not initramfs (%s)"
|
|
"; looks like an initrd\n", err);
|
|
fd = sys_open("/initrd.image",
|
|
O_WRONLY|O_CREAT, 0700);
|
|
if (fd >= 0) {
|
|
ssize_t written = xwrite(fd, (char *)initrd_start,
|
|
initrd_end - initrd_start);
|
|
|
|
if (written != initrd_end - initrd_start)
|
|
pr_err("/initrd.image: incomplete write (%zd != %ld)\n",
|
|
written, initrd_end - initrd_start);
|
|
|
|
sys_close(fd);
|
|
free_initrd();
|
|
}
|
|
done:
|
|
/* empty statement */;
|
|
#else
|
|
printk(KERN_INFO "Unpacking initramfs...\n");
|
|
err = unpack_to_rootfs((char *)initrd_start,
|
|
initrd_end - initrd_start);
|
|
if (err)
|
|
printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
|
|
free_initrd();
|
|
#endif
|
|
}
|
|
flush_delayed_fput();
|
|
/*
|
|
* Try loading default modules from initramfs. This gives
|
|
* us a chance to load before device_initcalls.
|
|
*/
|
|
load_default_modules();
|
|
|
|
return 0;
|
|
}
|
|
rootfs_initcall(populate_rootfs);
|