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Re: [PATCH v5 5/5] Add sancov plugin

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On Sun, Mar 6, 2016 at 3:07 PM, Emese Revfy <re.emese@gmail.com> wrote:
> The sancov gcc plugin inserts a __sanitizer_cov_trace_pc() call
> at the start of basic blocks.
>
> This plugin is a helper plugin for the kcov feature. It supports
> all gcc versions with plugin support (from gcc-4.5 on).
> It is based on the gcc commit "Add fuzzing coverage support" by Dmitry Vyukov
> (https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=231296).

Very cool! Dmitry, is this something you could put to good use?

> [...]
> diff --git a/tools/gcc/sancov_plugin.c b/tools/gcc/sancov_plugin.c
> new file mode 100644
> index 0000000..5a9179b
> --- /dev/null
> +++ b/tools/gcc/sancov_plugin.c
> @@ -0,0 +1,133 @@
> +/*
> + * Copyright 2011-2016 by Emese Revfy <re.emese@gmail.com>
> + * Licensed under the GPL v2, or (at your option) v3
> + *
> + * Homepage:
> + * https://github.com/ephox-gcc-plugins/sancov
> + *
> + * This plugin inserts a __sanitizer_cov_trace_pc() call at the start of basic blocks.
> + * It supports all gcc versions with plugin support (from gcc-4.5 on).
> + * It is based on the commit "Add fuzzing coverage support" by Dmitry Vyukov <dvyukov@google.com>.
> + *
> + * You can read about it more here:
> + *  https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=231296
> + *  http://lwn.net/Articles/674854/
> + *  https://github.com/google/syzkaller
> + *  https://lwn.net/Articles/677764/
> + *
> + * Usage:
> + * make run

Is this accurate? Wouldn't it just be selected from CONFIGs during kernel build?

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security

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[PATCH v5 0/5] Introduce GCC plugin infrastructure Emese Revfy <re.emese@gmail.com> - 2016-03-07 00:10 +0100
  [PATCH v5 3/5] Add Cyclomatic complexity GCC plugin Emese Revfy <re.emese@gmail.com> - 2016-03-07 00:10 +0100
    Re: [PATCH v5 3/5] Add Cyclomatic complexity GCC plugin Masahiro Yamada <yamada.masahiro@socionext.com> - 2016-03-11 07:30 +0100
      Re: [PATCH v5 3/5] Add Cyclomatic complexity GCC plugin Emese Revfy <re.emese@gmail.com> - 2016-03-14 22:10 +0100
  [PATCH v5 5/5] Add sancov plugin Emese Revfy <re.emese@gmail.com> - 2016-03-07 00:10 +0100
    Re: [PATCH v5 5/5] Add sancov plugin Kees Cook <keescook@chromium.org> - 2016-03-07 22:10 +0100
      Re: [PATCH v5 5/5] Add sancov plugin Emese Revfy <re.emese@gmail.com> - 2016-03-07 22:40 +0100
      Re: [PATCH v5 5/5] Add sancov plugin Dmitry Vyukov <dvyukov@google.com> - 2016-03-08 12:00 +0100
  [PATCH v5 1/5] Shared library support Emese Revfy <re.emese@gmail.com> - 2016-03-07 00:10 +0100
    Re: [PATCH v5 1/5] Shared library support Kees Cook <keescook@chromium.org> - 2016-03-07 22:10 +0100
      Re: [PATCH v5 1/5] Shared library support Emese Revfy <re.emese@gmail.com> - 2016-03-07 22:40 +0100
    Re: [PATCH v5 1/5] Shared library support Masahiro Yamada <yamada.masahiro@socionext.com> - 2016-03-11 07:30 +0100
      Re: [PATCH v5 1/5] Shared library support Emese Revfy <re.emese@gmail.com> - 2016-03-14 21:20 +0100
        Re: [PATCH v5 1/5] Shared library support Masahiro Yamada <yamada.masahiro@socionext.com> - 2016-03-16 09:00 +0100
  Re: [kernel-hardening] [PATCH v5 2/5] GCC plugin infrastructure David Brown <david.brown@linaro.org> - 2016-03-09 10:10 +0100
    Re: [kernel-hardening] [PATCH v5 2/5] GCC plugin infrastructure Kees Cook <keescook@chromium.org> - 2016-03-09 22:00 +0100
      Re: [kernel-hardening] [PATCH v5 2/5] GCC plugin infrastructure Emese Revfy <re.emese@gmail.com> - 2016-03-09 23:10 +0100
    Re: [kernel-hardening] [PATCH v5 2/5] GCC plugin infrastructure Emese Revfy <re.emese@gmail.com> - 2016-03-09 23:10 +0100
  Re: [PATCH v5 2/5] GCC plugin infrastructure Masahiro Yamada <yamada.masahiro@socionext.com> - 2016-03-11 07:30 +0100
    Re: [PATCH v5 2/5] GCC plugin infrastructure Emese Revfy <re.emese@gmail.com> - 2016-03-14 22:00 +0100
      Re: [PATCH v5 2/5] GCC plugin infrastructure Masahiro Yamada <yamada.masahiro@socionext.com> - 2016-03-16 08:50 +0100
        Re: [PATCH v5 2/5] GCC plugin infrastructure Emese Revfy <re.emese@gmail.com> - 2016-03-16 22:10 +0100
    Re: [PATCH v5 2/5] GCC plugin infrastructure "PaX Team" <pageexec@freemail.hu> - 2016-03-14 22:30 +0100
      Re: [PATCH v5 2/5] GCC plugin infrastructure Masahiro Yamada <yamada.masahiro@socionext.com> - 2016-03-16 08:40 +0100
        Re: [PATCH v5 2/5] GCC plugin infrastructure "PaX Team" <pageexec@freemail.hu> - 2016-03-16 14:00 +0100
          Re: [PATCH v5 2/5] GCC plugin infrastructure Masahiro Yamada <yamada.masahiro@socionext.com> - 2016-03-17 05:20 +0100

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