On Wed, Aug 30, 2017 at 09:08:43PM +0200, Dmitry Vyukov wrote:

On Wed, Aug 30, 2017 at 8:23 PM, Mark Rutland [off-list ref] wrote:

quoted

On Wed, Aug 30, 2017 at 06:23:29PM +0200, Dmitry Vyukov wrote:

quoted

From: Victor Chibotaru <redacted>

Enables kcov to collect comparison operands from instrumented code.
This is done by using Clang's -fsanitize=trace-cmp instrumentation
(currently not available for GCC).

quoted

quoted

Clang instrumentation:
https://clang.llvm.org/docs/SanitizerCoverage.html#tracing-data-flow

How stable is this?

The comment at the end says "This interface is a subject to change."

The intention is that this is not subject to change anymore (since we
are using it in kernel).
I've mailed change to docs: https://reviews.llvm.org/D37303

Ok; thanks for confirming.

FWIW, there is patch in flight that adds this instrumentation to gcc:
https://groups.google.com/forum/#!topic/syzkaller/CSLynn6nI-A
It seems to be stalled on review phase, though.

Let's hope it gets unblocked soon. :)

Thanks,
Mark.

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