02 Nov, 2017

1 commit

• b24413180   License cleanup: add SPDX GPL-2.0 license identifier to files with no license ... Browse Code »

  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
  Reviewed-by: Philippe Ombredanne
  Reviewed-by: Thomas Gleixner
  Signed-off-by: Greg Kroah-Hartman

  Greg Kroah-Hartman

  2017-11-02 18:10:55 +0800  

09 Aug, 2016

1 commit

• ed58c0e9e   gcc-plugins: abort builds cleanly when not supported ... Browse Code »

  When the compiler doesn't support gcc plugins (either due to missing
  headers or too old a version), report the problem and abort the build
  instead of emitting a warning and letting the build founder with arcane
  compiler errors.

  Signed-off-by: Kees Cook

  Kees Cook

  2016-08-09 08:49:05 +0800  

08 Jun, 2016

1 commit

• 6b90bd4ba   GCC plugin infrastructure ... Browse Code »

  This patch allows to build the whole kernel with GCC plugins. It was ported from
  grsecurity/PaX. The infrastructure supports building out-of-tree modules and
  building in a separate directory. Cross-compilation is supported too.
  Currently the x86, arm, arm64 and uml architectures enable plugins.

  The directory of the gcc plugins is scripts/gcc-plugins. You can use a file or a directory
  there. The plugins compile with these options:
  * -fno-rtti: gcc is compiled with this option so the plugins must use it too
  * -fno-exceptions: this is inherited from gcc too
  * -fasynchronous-unwind-tables: this is inherited from gcc too
  * -ggdb: it is useful for debugging a plugin (better backtrace on internal
  errors)
  * -Wno-narrowing: to suppress warnings from gcc headers (ipa-utils.h)
  * -Wno-unused-variable: to suppress warnings from gcc headers (gcc_version
  variable, plugin-version.h)

  The infrastructure introduces a new Makefile target called gcc-plugins. It
  supports all gcc versions from 4.5 to 6.0. The scripts/gcc-plugin.sh script
  chooses the proper host compiler (gcc-4.7 can be built by either gcc or g++).
  This script also checks the availability of the included headers in
  scripts/gcc-plugins/gcc-common.h.

  The gcc-common.h header contains frequently included headers for GCC plugins
  and it has a compatibility layer for the supported gcc versions.

  The gcc-generate-*-pass.h headers automatically generate the registration
  structures for GIMPLE, SIMPLE_IPA, IPA and RTL passes.

  Note that 'make clean' keeps the *.so files (only the distclean or mrproper
  targets clean all) because they are needed for out-of-tree modules.

  Based on work created by the PaX Team.

  Signed-off-by: Emese Revfy
  Acked-by: Kees Cook
  Signed-off-by: Michal Marek

  Emese Revfy

  2016-06-08 04:57:10 +0800