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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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>
203 lines
5.4 KiB
C
203 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* security/tomoyo/memory.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 <linux/hash.h>
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#include <linux/slab.h>
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#include "common.h"
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/**
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* tomoyo_warn_oom - Print out of memory warning message.
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*
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* @function: Function's name.
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*/
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void tomoyo_warn_oom(const char *function)
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{
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/* Reduce error messages. */
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static pid_t tomoyo_last_pid;
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const pid_t pid = current->pid;
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if (tomoyo_last_pid != pid) {
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printk(KERN_WARNING "ERROR: Out of memory at %s.\n",
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function);
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tomoyo_last_pid = pid;
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}
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if (!tomoyo_policy_loaded)
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panic("MAC Initialization failed.\n");
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}
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/* Memoy currently used by policy/audit log/query. */
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unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT];
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/* Memory quota for "policy"/"audit log"/"query". */
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unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT];
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/**
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* tomoyo_memory_ok - Check memory quota.
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*
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* @ptr: Pointer to allocated memory.
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*
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* Returns true on success, false otherwise.
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*
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* Returns true if @ptr is not NULL and quota not exceeded, false otherwise.
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*
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* Caller holds tomoyo_policy_lock mutex.
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*/
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bool tomoyo_memory_ok(void *ptr)
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{
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if (ptr) {
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const size_t s = ksize(ptr);
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tomoyo_memory_used[TOMOYO_MEMORY_POLICY] += s;
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if (!tomoyo_memory_quota[TOMOYO_MEMORY_POLICY] ||
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tomoyo_memory_used[TOMOYO_MEMORY_POLICY] <=
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tomoyo_memory_quota[TOMOYO_MEMORY_POLICY])
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return true;
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tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= s;
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}
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tomoyo_warn_oom(__func__);
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return false;
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}
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/**
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* tomoyo_commit_ok - Check memory quota.
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*
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* @data: Data to copy from.
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* @size: Size in byte.
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*
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* Returns pointer to allocated memory on success, NULL otherwise.
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* @data is zero-cleared on success.
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*
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* Caller holds tomoyo_policy_lock mutex.
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*/
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void *tomoyo_commit_ok(void *data, const unsigned int size)
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{
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void *ptr = kzalloc(size, GFP_NOFS);
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if (tomoyo_memory_ok(ptr)) {
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memmove(ptr, data, size);
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memset(data, 0, size);
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return ptr;
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}
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kfree(ptr);
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return NULL;
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}
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/**
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* tomoyo_get_group - Allocate memory for "struct tomoyo_path_group"/"struct tomoyo_number_group".
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*
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* @param: Pointer to "struct tomoyo_acl_param".
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* @idx: Index number.
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*
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* Returns pointer to "struct tomoyo_group" on success, NULL otherwise.
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*/
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struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param,
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const u8 idx)
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{
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struct tomoyo_group e = { };
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struct tomoyo_group *group = NULL;
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struct list_head *list;
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const char *group_name = tomoyo_read_token(param);
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bool found = false;
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if (!tomoyo_correct_word(group_name) || idx >= TOMOYO_MAX_GROUP)
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return NULL;
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e.group_name = tomoyo_get_name(group_name);
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if (!e.group_name)
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return NULL;
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if (mutex_lock_interruptible(&tomoyo_policy_lock))
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goto out;
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list = ¶m->ns->group_list[idx];
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list_for_each_entry(group, list, head.list) {
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if (e.group_name != group->group_name ||
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atomic_read(&group->head.users) == TOMOYO_GC_IN_PROGRESS)
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continue;
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atomic_inc(&group->head.users);
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found = true;
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break;
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}
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if (!found) {
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struct tomoyo_group *entry = tomoyo_commit_ok(&e, sizeof(e));
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if (entry) {
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INIT_LIST_HEAD(&entry->member_list);
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atomic_set(&entry->head.users, 1);
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list_add_tail_rcu(&entry->head.list, list);
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group = entry;
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found = true;
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}
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}
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mutex_unlock(&tomoyo_policy_lock);
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out:
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tomoyo_put_name(e.group_name);
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return found ? group : NULL;
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}
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/*
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* tomoyo_name_list is used for holding string data used by TOMOYO.
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* Since same string data is likely used for multiple times (e.g.
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* "/lib/libc-2.5.so"), TOMOYO shares string data in the form of
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* "const struct tomoyo_path_info *".
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*/
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struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
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/**
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* tomoyo_get_name - Allocate permanent memory for string data.
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*
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* @name: The string to store into the permernent memory.
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*
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* Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise.
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*/
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const struct tomoyo_path_info *tomoyo_get_name(const char *name)
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{
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struct tomoyo_name *ptr;
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unsigned int hash;
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int len;
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struct list_head *head;
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if (!name)
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return NULL;
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len = strlen(name) + 1;
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hash = full_name_hash(NULL, (const unsigned char *) name, len - 1);
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head = &tomoyo_name_list[hash_long(hash, TOMOYO_HASH_BITS)];
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if (mutex_lock_interruptible(&tomoyo_policy_lock))
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return NULL;
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list_for_each_entry(ptr, head, head.list) {
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if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name) ||
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atomic_read(&ptr->head.users) == TOMOYO_GC_IN_PROGRESS)
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continue;
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atomic_inc(&ptr->head.users);
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goto out;
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}
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ptr = kzalloc(sizeof(*ptr) + len, GFP_NOFS);
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if (tomoyo_memory_ok(ptr)) {
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ptr->entry.name = ((char *) ptr) + sizeof(*ptr);
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memmove((char *) ptr->entry.name, name, len);
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atomic_set(&ptr->head.users, 1);
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tomoyo_fill_path_info(&ptr->entry);
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list_add_tail(&ptr->head.list, head);
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} else {
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kfree(ptr);
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ptr = NULL;
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}
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out:
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mutex_unlock(&tomoyo_policy_lock);
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return ptr ? &ptr->entry : NULL;
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}
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/* Initial namespace.*/
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struct tomoyo_policy_namespace tomoyo_kernel_namespace;
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/**
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* tomoyo_mm_init - Initialize mm related code.
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*/
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void __init tomoyo_mm_init(void)
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{
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int idx;
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for (idx = 0; idx < TOMOYO_MAX_HASH; idx++)
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INIT_LIST_HEAD(&tomoyo_name_list[idx]);
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tomoyo_kernel_namespace.name = "<kernel>";
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tomoyo_init_policy_namespace(&tomoyo_kernel_namespace);
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tomoyo_kernel_domain.ns = &tomoyo_kernel_namespace;
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INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list);
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tomoyo_kernel_domain.domainname = tomoyo_get_name("<kernel>");
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list_add_tail_rcu(&tomoyo_kernel_domain.list, &tomoyo_domain_list);
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}
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