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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>
466 lines
13 KiB
C
466 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* This is a maximally equidistributed combined Tausworthe generator
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* based on code from GNU Scientific Library 1.5 (30 Jun 2004)
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*
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* lfsr113 version:
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*
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* x_n = (s1_n ^ s2_n ^ s3_n ^ s4_n)
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*
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* s1_{n+1} = (((s1_n & 4294967294) << 18) ^ (((s1_n << 6) ^ s1_n) >> 13))
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* s2_{n+1} = (((s2_n & 4294967288) << 2) ^ (((s2_n << 2) ^ s2_n) >> 27))
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* s3_{n+1} = (((s3_n & 4294967280) << 7) ^ (((s3_n << 13) ^ s3_n) >> 21))
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* s4_{n+1} = (((s4_n & 4294967168) << 13) ^ (((s4_n << 3) ^ s4_n) >> 12))
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*
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* The period of this generator is about 2^113 (see erratum paper).
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*
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* From: P. L'Ecuyer, "Maximally Equidistributed Combined Tausworthe
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* Generators", Mathematics of Computation, 65, 213 (1996), 203--213:
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* http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps
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* ftp://ftp.iro.umontreal.ca/pub/simulation/lecuyer/papers/tausme.ps
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*
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* There is an erratum in the paper "Tables of Maximally Equidistributed
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* Combined LFSR Generators", Mathematics of Computation, 68, 225 (1999),
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* 261--269: http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
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*
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* ... the k_j most significant bits of z_j must be non-zero,
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* for each j. (Note: this restriction also applies to the
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* computer code given in [4], but was mistakenly not mentioned
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* in that paper.)
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*
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* This affects the seeding procedure by imposing the requirement
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* s1 > 1, s2 > 7, s3 > 15, s4 > 127.
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*/
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#include <linux/types.h>
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#include <linux/percpu.h>
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#include <linux/export.h>
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#include <linux/jiffies.h>
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#include <linux/random.h>
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#include <linux/sched.h>
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#include <asm/unaligned.h>
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#ifdef CONFIG_RANDOM32_SELFTEST
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static void __init prandom_state_selftest(void);
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#else
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static inline void prandom_state_selftest(void)
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{
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}
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#endif
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static DEFINE_PER_CPU(struct rnd_state, net_rand_state) __latent_entropy;
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/**
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* prandom_u32_state - seeded pseudo-random number generator.
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* @state: pointer to state structure holding seeded state.
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*
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* This is used for pseudo-randomness with no outside seeding.
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* For more random results, use prandom_u32().
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*/
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u32 prandom_u32_state(struct rnd_state *state)
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{
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#define TAUSWORTHE(s, a, b, c, d) ((s & c) << d) ^ (((s << a) ^ s) >> b)
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state->s1 = TAUSWORTHE(state->s1, 6U, 13U, 4294967294U, 18U);
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state->s2 = TAUSWORTHE(state->s2, 2U, 27U, 4294967288U, 2U);
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state->s3 = TAUSWORTHE(state->s3, 13U, 21U, 4294967280U, 7U);
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state->s4 = TAUSWORTHE(state->s4, 3U, 12U, 4294967168U, 13U);
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return (state->s1 ^ state->s2 ^ state->s3 ^ state->s4);
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}
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EXPORT_SYMBOL(prandom_u32_state);
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/**
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* prandom_u32 - pseudo random number generator
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*
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* A 32 bit pseudo-random number is generated using a fast
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* algorithm suitable for simulation. This algorithm is NOT
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* considered safe for cryptographic use.
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*/
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u32 prandom_u32(void)
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{
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struct rnd_state *state = &get_cpu_var(net_rand_state);
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u32 res;
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res = prandom_u32_state(state);
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put_cpu_var(net_rand_state);
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return res;
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}
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EXPORT_SYMBOL(prandom_u32);
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/**
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* prandom_bytes_state - get the requested number of pseudo-random bytes
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*
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* @state: pointer to state structure holding seeded state.
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* @buf: where to copy the pseudo-random bytes to
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* @bytes: the requested number of bytes
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*
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* This is used for pseudo-randomness with no outside seeding.
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* For more random results, use prandom_bytes().
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*/
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void prandom_bytes_state(struct rnd_state *state, void *buf, size_t bytes)
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{
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u8 *ptr = buf;
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while (bytes >= sizeof(u32)) {
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put_unaligned(prandom_u32_state(state), (u32 *) ptr);
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ptr += sizeof(u32);
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bytes -= sizeof(u32);
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}
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if (bytes > 0) {
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u32 rem = prandom_u32_state(state);
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do {
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*ptr++ = (u8) rem;
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bytes--;
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rem >>= BITS_PER_BYTE;
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} while (bytes > 0);
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}
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}
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EXPORT_SYMBOL(prandom_bytes_state);
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/**
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* prandom_bytes - get the requested number of pseudo-random bytes
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* @buf: where to copy the pseudo-random bytes to
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* @bytes: the requested number of bytes
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*/
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void prandom_bytes(void *buf, size_t bytes)
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{
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struct rnd_state *state = &get_cpu_var(net_rand_state);
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prandom_bytes_state(state, buf, bytes);
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put_cpu_var(net_rand_state);
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}
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EXPORT_SYMBOL(prandom_bytes);
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static void prandom_warmup(struct rnd_state *state)
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{
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/* Calling RNG ten times to satisfy recurrence condition */
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prandom_u32_state(state);
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prandom_u32_state(state);
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prandom_u32_state(state);
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prandom_u32_state(state);
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prandom_u32_state(state);
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prandom_u32_state(state);
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prandom_u32_state(state);
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prandom_u32_state(state);
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prandom_u32_state(state);
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prandom_u32_state(state);
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}
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static u32 __extract_hwseed(void)
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{
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unsigned int val = 0;
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(void)(arch_get_random_seed_int(&val) ||
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arch_get_random_int(&val));
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return val;
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}
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static void prandom_seed_early(struct rnd_state *state, u32 seed,
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bool mix_with_hwseed)
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{
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#define LCG(x) ((x) * 69069U) /* super-duper LCG */
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#define HWSEED() (mix_with_hwseed ? __extract_hwseed() : 0)
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state->s1 = __seed(HWSEED() ^ LCG(seed), 2U);
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state->s2 = __seed(HWSEED() ^ LCG(state->s1), 8U);
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state->s3 = __seed(HWSEED() ^ LCG(state->s2), 16U);
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state->s4 = __seed(HWSEED() ^ LCG(state->s3), 128U);
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}
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/**
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* prandom_seed - add entropy to pseudo random number generator
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* @seed: seed value
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*
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* Add some additional seeding to the prandom pool.
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*/
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void prandom_seed(u32 entropy)
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{
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int i;
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/*
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* No locking on the CPUs, but then somewhat random results are, well,
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* expected.
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*/
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for_each_possible_cpu(i) {
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struct rnd_state *state = &per_cpu(net_rand_state, i);
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state->s1 = __seed(state->s1 ^ entropy, 2U);
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prandom_warmup(state);
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}
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}
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EXPORT_SYMBOL(prandom_seed);
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/*
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* Generate some initially weak seeding values to allow
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* to start the prandom_u32() engine.
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*/
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static int __init prandom_init(void)
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{
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int i;
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prandom_state_selftest();
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for_each_possible_cpu(i) {
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struct rnd_state *state = &per_cpu(net_rand_state, i);
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u32 weak_seed = (i + jiffies) ^ random_get_entropy();
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prandom_seed_early(state, weak_seed, true);
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prandom_warmup(state);
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}
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return 0;
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}
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core_initcall(prandom_init);
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static void __prandom_timer(unsigned long dontcare);
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static DEFINE_TIMER(seed_timer, __prandom_timer, 0, 0);
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static void __prandom_timer(unsigned long dontcare)
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{
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u32 entropy;
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unsigned long expires;
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get_random_bytes(&entropy, sizeof(entropy));
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prandom_seed(entropy);
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/* reseed every ~60 seconds, in [40 .. 80) interval with slack */
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expires = 40 + prandom_u32_max(40);
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seed_timer.expires = jiffies + msecs_to_jiffies(expires * MSEC_PER_SEC);
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add_timer(&seed_timer);
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}
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static void __init __prandom_start_seed_timer(void)
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{
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seed_timer.expires = jiffies + msecs_to_jiffies(40 * MSEC_PER_SEC);
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add_timer(&seed_timer);
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}
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void prandom_seed_full_state(struct rnd_state __percpu *pcpu_state)
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{
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int i;
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for_each_possible_cpu(i) {
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struct rnd_state *state = per_cpu_ptr(pcpu_state, i);
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u32 seeds[4];
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get_random_bytes(&seeds, sizeof(seeds));
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state->s1 = __seed(seeds[0], 2U);
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state->s2 = __seed(seeds[1], 8U);
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state->s3 = __seed(seeds[2], 16U);
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state->s4 = __seed(seeds[3], 128U);
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prandom_warmup(state);
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}
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}
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EXPORT_SYMBOL(prandom_seed_full_state);
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/*
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* Generate better values after random number generator
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* is fully initialized.
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*/
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static void __prandom_reseed(bool late)
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{
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unsigned long flags;
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static bool latch = false;
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static DEFINE_SPINLOCK(lock);
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/* Asking for random bytes might result in bytes getting
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* moved into the nonblocking pool and thus marking it
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* as initialized. In this case we would double back into
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* this function and attempt to do a late reseed.
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* Ignore the pointless attempt to reseed again if we're
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* already waiting for bytes when the nonblocking pool
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* got initialized.
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*/
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/* only allow initial seeding (late == false) once */
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if (!spin_trylock_irqsave(&lock, flags))
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return;
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if (latch && !late)
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goto out;
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latch = true;
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prandom_seed_full_state(&net_rand_state);
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out:
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spin_unlock_irqrestore(&lock, flags);
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}
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void prandom_reseed_late(void)
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{
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__prandom_reseed(true);
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}
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static int __init prandom_reseed(void)
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{
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__prandom_reseed(false);
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__prandom_start_seed_timer();
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return 0;
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}
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late_initcall(prandom_reseed);
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#ifdef CONFIG_RANDOM32_SELFTEST
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static struct prandom_test1 {
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u32 seed;
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u32 result;
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} test1[] = {
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{ 1U, 3484351685U },
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{ 2U, 2623130059U },
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{ 3U, 3125133893U },
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{ 4U, 984847254U },
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};
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static struct prandom_test2 {
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u32 seed;
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u32 iteration;
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u32 result;
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} test2[] = {
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/* Test cases against taus113 from GSL library. */
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{ 931557656U, 959U, 2975593782U },
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{ 1339693295U, 876U, 3887776532U },
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{ 1545556285U, 961U, 1615538833U },
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{ 601730776U, 723U, 1776162651U },
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{ 1027516047U, 687U, 511983079U },
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{ 416526298U, 700U, 916156552U },
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{ 1395522032U, 652U, 2222063676U },
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{ 366221443U, 617U, 2992857763U },
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{ 1539836965U, 714U, 3783265725U },
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{ 556206671U, 994U, 799626459U },
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{ 684907218U, 799U, 367789491U },
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{ 2121230701U, 931U, 2115467001U },
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{ 1668516451U, 644U, 3620590685U },
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{ 768046066U, 883U, 2034077390U },
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{ 1989159136U, 833U, 1195767305U },
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{ 536585145U, 996U, 3577259204U },
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{ 1008129373U, 642U, 1478080776U },
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{ 1740775604U, 939U, 1264980372U },
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{ 1967883163U, 508U, 10734624U },
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{ 1923019697U, 730U, 3821419629U },
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{ 442079932U, 560U, 3440032343U },
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{ 1961302714U, 845U, 841962572U },
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{ 2030205964U, 962U, 1325144227U },
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{ 1160407529U, 507U, 240940858U },
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{ 635482502U, 779U, 4200489746U },
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{ 1252788931U, 699U, 867195434U },
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{ 1961817131U, 719U, 668237657U },
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{ 1071468216U, 983U, 917876630U },
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{ 1281848367U, 932U, 1003100039U },
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{ 582537119U, 780U, 1127273778U },
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{ 1973672777U, 853U, 1071368872U },
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{ 1896756996U, 762U, 1127851055U },
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{ 847917054U, 500U, 1717499075U },
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{ 1240520510U, 951U, 2849576657U },
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{ 1685071682U, 567U, 1961810396U },
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{ 1516232129U, 557U, 3173877U },
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{ 1208118903U, 612U, 1613145022U },
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{ 1817269927U, 693U, 4279122573U },
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{ 1510091701U, 717U, 638191229U },
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{ 365916850U, 807U, 600424314U },
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{ 399324359U, 702U, 1803598116U },
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{ 1318480274U, 779U, 2074237022U },
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{ 697758115U, 840U, 1483639402U },
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{ 1696507773U, 840U, 577415447U },
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{ 2081979121U, 981U, 3041486449U },
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{ 955646687U, 742U, 3846494357U },
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{ 1250683506U, 749U, 836419859U },
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{ 595003102U, 534U, 366794109U },
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{ 47485338U, 558U, 3521120834U },
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{ 619433479U, 610U, 3991783875U },
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{ 704096520U, 518U, 4139493852U },
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{ 1712224984U, 606U, 2393312003U },
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{ 1318233152U, 922U, 3880361134U },
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|
{ 855572992U, 761U, 1472974787U },
|
|
{ 64721421U, 703U, 683860550U },
|
|
{ 678931758U, 840U, 380616043U },
|
|
{ 692711973U, 778U, 1382361947U },
|
|
{ 677703619U, 530U, 2826914161U },
|
|
{ 92393223U, 586U, 1522128471U },
|
|
{ 1222592920U, 743U, 3466726667U },
|
|
{ 358288986U, 695U, 1091956998U },
|
|
{ 1935056945U, 958U, 514864477U },
|
|
{ 735675993U, 990U, 1294239989U },
|
|
{ 1560089402U, 897U, 2238551287U },
|
|
{ 70616361U, 829U, 22483098U },
|
|
{ 368234700U, 731U, 2913875084U },
|
|
{ 20221190U, 879U, 1564152970U },
|
|
{ 539444654U, 682U, 1835141259U },
|
|
{ 1314987297U, 840U, 1801114136U },
|
|
{ 2019295544U, 645U, 3286438930U },
|
|
{ 469023838U, 716U, 1637918202U },
|
|
{ 1843754496U, 653U, 2562092152U },
|
|
{ 400672036U, 809U, 4264212785U },
|
|
{ 404722249U, 965U, 2704116999U },
|
|
{ 600702209U, 758U, 584979986U },
|
|
{ 519953954U, 667U, 2574436237U },
|
|
{ 1658071126U, 694U, 2214569490U },
|
|
{ 420480037U, 749U, 3430010866U },
|
|
{ 690103647U, 969U, 3700758083U },
|
|
{ 1029424799U, 937U, 3787746841U },
|
|
{ 2012608669U, 506U, 3362628973U },
|
|
{ 1535432887U, 998U, 42610943U },
|
|
{ 1330635533U, 857U, 3040806504U },
|
|
{ 1223800550U, 539U, 3954229517U },
|
|
{ 1322411537U, 680U, 3223250324U },
|
|
{ 1877847898U, 945U, 2915147143U },
|
|
{ 1646356099U, 874U, 965988280U },
|
|
{ 805687536U, 744U, 4032277920U },
|
|
{ 1948093210U, 633U, 1346597684U },
|
|
{ 392609744U, 783U, 1636083295U },
|
|
{ 690241304U, 770U, 1201031298U },
|
|
{ 1360302965U, 696U, 1665394461U },
|
|
{ 1220090946U, 780U, 1316922812U },
|
|
{ 447092251U, 500U, 3438743375U },
|
|
{ 1613868791U, 592U, 828546883U },
|
|
{ 523430951U, 548U, 2552392304U },
|
|
{ 726692899U, 810U, 1656872867U },
|
|
{ 1364340021U, 836U, 3710513486U },
|
|
{ 1986257729U, 931U, 935013962U },
|
|
{ 407983964U, 921U, 728767059U },
|
|
};
|
|
|
|
static void __init prandom_state_selftest(void)
|
|
{
|
|
int i, j, errors = 0, runs = 0;
|
|
bool error = false;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(test1); i++) {
|
|
struct rnd_state state;
|
|
|
|
prandom_seed_early(&state, test1[i].seed, false);
|
|
prandom_warmup(&state);
|
|
|
|
if (test1[i].result != prandom_u32_state(&state))
|
|
error = true;
|
|
}
|
|
|
|
if (error)
|
|
pr_warn("prandom: seed boundary self test failed\n");
|
|
else
|
|
pr_info("prandom: seed boundary self test passed\n");
|
|
|
|
for (i = 0; i < ARRAY_SIZE(test2); i++) {
|
|
struct rnd_state state;
|
|
|
|
prandom_seed_early(&state, test2[i].seed, false);
|
|
prandom_warmup(&state);
|
|
|
|
for (j = 0; j < test2[i].iteration - 1; j++)
|
|
prandom_u32_state(&state);
|
|
|
|
if (test2[i].result != prandom_u32_state(&state))
|
|
errors++;
|
|
|
|
runs++;
|
|
cond_resched();
|
|
}
|
|
|
|
if (errors)
|
|
pr_warn("prandom: %d/%d self tests failed\n", errors, runs);
|
|
else
|
|
pr_info("prandom: %d self tests passed\n", runs);
|
|
}
|
|
#endif
|