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Date: Thu, 11 Jun 2015 08:10:50 +0200 From: Ingo Molnar <mingo@...nel.org> To: Josh Poimboeuf <jpoimboe@...hat.com> Cc: Andy Lutomirski <luto@...capital.net>, Michal Marek <mmarek@...e.cz>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Andi Kleen <andi@...stfloor.org>, live-patching@...r.kernel.org, X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Peter Zijlstra <peterz@...radead.org> Subject: Re: [PATCH v5 02/10] x86: Compile-time asm code validation * Josh Poimboeuf <jpoimboe@...hat.com> wrote: > > I imagine that an automatic CFI annotation adder would walk through functions > > one instruction at a time and keep track of the frame state. If so, then it > > could verify that common jump targets had identical state and continue walking > > through them and annotating. I think this would get this case right, and it > > might be necessary anyway to handle jumps within functions. > > This would definitely add complexity to both asmvalidate and the CFI generator. > In fact it sounds like it would push the CFI generator out of its current awk > script territory and more into complex C code territory. I'd count that as a plus: awk isn't a common skillset while C is, and properly written it doesn't have to be _that_ complex. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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