linux-kernel - Re: [PATCH 1/2] x86, stackvalidate: Compile-time stack frame pointer validation

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Message-ID: <20150428121606.GX23123@twins.programming.kicks-ass.net>
Date:	Tue, 28 Apr 2015 14:16:06 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	x86@...nel.org, live-patching@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86, stackvalidate: Compile-time stack frame pointer
 validation

On Mon, Apr 27, 2015 at 08:56:27AM -0500, Josh Poimboeuf wrote:
> Frame pointer based stack traces aren't always reliable.  One big reason
> is that most asm functions don't set up the frame pointer.
> 
> Fix that by enforcing that all asm functions honor CONFIG_FRAME_POINTER.
> This is done with a new stackvalidate host tool which is automatically
> run for every compiled .S file and which validates that every asm
> function does the proper frame pointer setup.

Would it make sense (maybe as an additional CONFIG_*_DEBUG thing) to
also process the output of GCC with this tool? To both double check GCC
and to give the tool more input?
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