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Re: [GIT PULL] gcc-plugins updates for v4.13-rc1

From Andrey Ryabinin <ryabinin.a.a@gmail.com>
Newsgroups linux.kernel
Subject Re: [GIT PULL] gcc-plugins updates for v4.13-rc1
Date 2017-07-06 00:50 +0200
Message-ID <u01hn-42Z-3@gated-at.bofh.it> (permalink)
References (1 earlier) <tZXQu-1WT-19@gated-at.bofh.it> <tZZpg-2RM-19@gated-at.bofh.it> <u00bF-3nZ-33@gated-at.bofh.it> <u00lk-3rk-23@gated-at.bofh.it> <u00v1-3uT-29@gated-at.bofh.it>
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2017-07-06 0:56 GMT+03:00 Linus Torvalds <torvalds@linux-foundation.org>:
> On Wed, Jul 5, 2017 at 2:48 PM, Arnd Bergmann <arnd@arndb.de> wrote:
>>
>> This particular example should be handled by
>> scripts/gcc-plugins/structleak_plugin.c, right?
>
> .. probably. But we have a ton of other uses that just pass in
> "result" pointers (not structs), which admittedly don't have the
> padding issue, but do have the exact same issue otherwise.
>
> We have those random "initialize to zero by hand", and I wouldn't
> actually worry about most of the common cases. KASAN will find them
> anyway.
>

KASAN doesn't find "use-of-unitialized memory" bugs. It can find only
use-after-free
and out-of-bounds accesses.

MemorySanitizer (aka KMSAN) is supposed to detect uses of unitialized memory.
It's still in WIP stage, but have some trophies already (just grep for
KMSAN in git log)


> It tends to be the random odd ioctl-like things that nobody finds
> because it's only uninitialized for some silly error case that never
> triggers (or some unusual driver that needs to be loaded).
>
>                  Linus

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Thread

[GIT PULL] gcc-plugins updates for v4.13-rc1 Kees Cook <keescook@chromium.org> - 2017-07-05 07:10 +0200
  Re: [GIT PULL] gcc-plugins updates for v4.13-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-07-05 21:10 +0200
    Re: [GIT PULL] gcc-plugins updates for v4.13-rc1 Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-07-05 22:50 +0200
      Re: [GIT PULL] gcc-plugins updates for v4.13-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-07-05 23:40 +0200
        Re: [GIT PULL] gcc-plugins updates for v4.13-rc1 Arnd Bergmann <arnd@arndb.de> - 2017-07-05 23:50 +0200
          Re: [GIT PULL] gcc-plugins updates for v4.13-rc1 Kees Cook <keescook@chromium.org> - 2017-07-06 00:00 +0200
          Re: [GIT PULL] gcc-plugins updates for v4.13-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-07-06 00:00 +0200
            Re: [GIT PULL] gcc-plugins updates for v4.13-rc1 Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-07-06 00:30 +0200
              Re: [GIT PULL] gcc-plugins updates for v4.13-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-07-06 00:40 +0200
            Re: [GIT PULL] gcc-plugins updates for v4.13-rc1 Andrey Ryabinin <ryabinin.a.a@gmail.com> - 2017-07-06 00:50 +0200
    Re: [GIT PULL] gcc-plugins updates for v4.13-rc1 Arnd Bergmann <arnd@arndb.de> - 2017-07-05 23:20 +0200
    Re: [GIT PULL] gcc-plugins updates for v4.13-rc1 Kees Cook <keescook@chromium.org> - 2017-07-05 23:50 +0200

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