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Date: Fri, 22 May 2015 00:01:58 +0200
From: Borislav Petkov <bp@alien8.de>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
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        linux-kernel@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andy Lutomirski <luto@kernel.org>,
        Denys Vlasenko <dvlasenk@redhat.com>, Brian Gerst <brgerst@gmail.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v4 0/3] Compile-time stack frame pointer validation
Message-ID: <20150521220158.GH3689@pd.tnic>
References: <cover.1431966710.git.jpoimboe@redhat.com>
 <20150520103339.GA22205@gmail.com>
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 <20150520144810.GA10374@gmail.com>
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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 :-)

-- 
Regards/Gruss,
    Boris.

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