Re: [PATCH v4 0/3] Compile-time stack frame pointer validation

Borislav Petkov
2015-05-21T22:02:05Z

On Thu, May 21, 2015 at 03:54:25PM -0500, Josh Poimboeuf wrote:
> stackvalidate: arch/x86/lib/memmove_64.o: return instruction outside of a function at .altinstr_replacement+0x5

That must be something like this:

0000000000000000 <.altinstr_replacement>:
0: 48 89 d1 mov %rdx,%rcx
3: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi)
5: c3 retq

right?

In any case, anything with alternatives is probably a false positive
because even if instructions appear outside of the containing function,
they get patched in and are actually inside. Jump offsets get fixed up
properly too. Should, at least :-)

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Regards/Gruss,
Boris.

ECO tip #101: Trim your mails when you reply.
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