linux-kernel - Re: [PATCH v5 02/10] x86: Compile-time asm code validation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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/