1. 02 Nov, 2017 1 commit
    • Greg Kroah-Hartman's avatar
      License cleanup: add SPDX GPL-2.0 license identifier to files with no license · b2441318
      Greg Kroah-Hartman authored
      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: default avatarKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b2441318
  2. 04 Aug, 2017 15 commits
  3. 18 May, 2017 1 commit
  4. 24 Apr, 2017 1 commit
  5. 10 Apr, 2017 1 commit
  6. 11 Feb, 2017 2 commits
  7. 03 Feb, 2017 8 commits
  8. 23 Jan, 2017 1 commit
  9. 12 Jan, 2017 4 commits
    • Ard Biesheuvel's avatar
      crypto: arm64/aes - reimplement bit-sliced ARM/NEON implementation for arm64 · 1abee99e
      Ard Biesheuvel authored
      This is a reimplementation of the NEON version of the bit-sliced AES
      algorithm. This code is heavily based on Andy Polyakov's OpenSSL version
      for ARM, which is also available in the kernel. This is an alternative for
      the existing NEON implementation for arm64 authored by me, which suffers
      from poor performance due to its reliance on the pathologically slow four
      register variant of the tbl/tbx NEON instruction.
      
      This version is about ~30% (*) faster than the generic C code, but only in
      cases where the input can be 8x interleaved (this is a fundamental property
      of bit slicing). For this reason, only the chaining modes ECB, XTS and CTR
      are implemented. (The significance of ECB is that it could potentially be
      used by other chaining modes)
      
      * Measured on Cortex-A57. Note that this is still an order of magnitude
        slower than the implementations that use the dedicated AES instructions
        introduced in ARMv8, but those are part of an optional extension, and so
        it is good to have a fallback.
      Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
      Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
      1abee99e
    • Ard Biesheuvel's avatar
      crypto: arm64/aes - add scalar implementation · bed593c0
      Ard Biesheuvel authored
      This adds a scalar implementation of AES, based on the precomputed tables
      that are exposed by the generic AES code. Since rotates are cheap on arm64,
      this implementation only uses the 4 core tables (of 1 KB each), and avoids
      the prerotated ones, reducing the D-cache footprint by 75%.
      
      On Cortex-A57, this code manages 13.0 cycles per byte, which is ~34% faster
      than the generic C code. (Note that this is still >13x slower than the code
      that uses the optional ARMv8 Crypto Extensions, which manages <1 cycles per
      byte.)
      Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
      Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
      bed593c0
    • Ard Biesheuvel's avatar
      crypto: arm64/aes-blk - expose AES-CTR as synchronous cipher as well · 293614ce
      Ard Biesheuvel authored
      In addition to wrapping the AES-CTR cipher into the async SIMD wrapper,
      which exposes it as an async skcipher that defers processing to process
      context, expose our AES-CTR implementation directly as a synchronous cipher
      as well, but with a lower priority.
      
      This makes the AES-CTR transform usable in places where synchronous
      transforms are required, such as the MAC802.11 encryption code, which
      executes in sotfirq context, where SIMD processing is allowed on arm64.
      Users of the async transform will keep the existing behavior.
      Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
      Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
      293614ce
    • Ard Biesheuvel's avatar
      crypto: arm64/chacha20 - implement NEON version based on SSE3 code · b7171ce9
      Ard Biesheuvel authored
      This is a straight port to arm64/NEON of the x86 SSE3 implementation
      of the ChaCha20 stream cipher. It uses the new skcipher walksize
      attribute to process the input in strides of 4x the block size.
      Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
      Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
      b7171ce9
  10. 28 Dec, 2016 1 commit
  11. 27 Dec, 2016 1 commit
  12. 07 Dec, 2016 2 commits
  13. 01 Dec, 2016 1 commit
  14. 30 Nov, 2016 1 commit