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Re: [PATCH] x86, kasan: add KASAN checks to atomic operations

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On Mon, Mar 06, 2017 at 04:20:18PM +0000, Mark Rutland wrote:
> > >> So the problem is doing load/stores from asm bits, and GCC
> > >> (traditionally) doesn't try and interpret APP asm bits.
> > >>
> > >> However, could we not write a GCC plugin that does exactly that?
> > >> Something that interprets the APP asm bits and generates these KASAN
> > >> bits that go with it?

> I don't think there's much you'll be able to do within the compiler,
> assuming you mean to derive this from the asm block inputs and outputs.

Nah, I was thinking about a full asm interpreter.

> Those can hide address-generation (e.g. with per-cpu stuff), which the
> compiler may erroneously be detected as racing.
> 
> Those may also take fake inputs (e.g. the sp input to arm64's
> __my_cpu_offset()) which may confuse matters.
> 
> Parsing the assembly itself will be *extremely* painful due to the way
> that's set up for run-time patching.

Argh, yah, completely forgot about all that alternative and similar
nonsense :/

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[PATCH] x86, kasan: add KASAN checks to atomic operations Dmitry Vyukov <dvyukov@google.com> - 2017-03-06 14:00 +0100
  Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Dmitry Vyukov <dvyukov@google.com> - 2017-03-06 14:00 +0100
    Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Peter Zijlstra <peterz@infradead.org> - 2017-03-06 14:30 +0100
      Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Peter Zijlstra <peterz@infradead.org> - 2017-03-06 14:50 +0100
        Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Dmitry Vyukov <dvyukov@google.com> - 2017-03-06 15:30 +0100
          Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Peter Zijlstra <peterz@infradead.org> - 2017-03-06 16:40 +0100
          Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Peter Zijlstra <peterz@infradead.org> - 2017-03-06 16:50 +0100
            Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Mark Rutland <mark.rutland@arm.com> - 2017-03-06 17:20 +0100
          Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Mark Rutland <mark.rutland@arm.com> - 2017-03-06 17:40 +0100
            Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Dmitry Vyukov <dvyukov@google.com> - 2017-03-06 17:40 +0100
              Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Mark Rutland <mark.rutland@arm.com> - 2017-03-06 18:30 +0100
            Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Peter Zijlstra <peterz@infradead.org> - 2017-03-06 22:10 +0100
              Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Dmitry Vyukov <dvyukov@google.com> - 2017-03-08 16:30 +0100
                Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Dmitry Vyukov <dvyukov@google.com> - 2017-03-08 16:50 +0100
                Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Mark Rutland <mark.rutland@arm.com> - 2017-03-08 17:00 +0100
                Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Mark Rutland <mark.rutland@arm.com> - 2017-03-08 16:50 +0100
              Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Mark Rutland <mark.rutland@arm.com> - 2017-03-08 16:40 +0100
                Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Will Deacon <will.deacon@arm.com> - 2017-03-08 19:50 +0100
              Re: [PATCH] x86, kasan: add KASAN checks to atomic operations Dmitry Vyukov <dvyukov@google.com> - 2017-03-08 17:30 +0100

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