linux-kernel - Re: [PATCH v3 16/51] x86/32: put real return address on stack in entry code

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:	Mon, 15 Aug 2016 11:04:42 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Andy Lutomirski <luto@...capital.net>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Brian Gerst <brgerst@...il.com>,
	Kees Cook <keescook@...omium.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Byungchul Park <byungchul.park@....com>,
	Nilay Vaish <nilayvaish@...il.com>
Subject: Re: [PATCH v3 16/51] x86/32: put real return address on stack in
 entry code

On 08/15/16 08:09, Josh Poimboeuf wrote:
> On Sun, Aug 14, 2016 at 12:31:47AM -0700, Andy Lutomirski wrote:
>> On Fri, Aug 12, 2016 at 7:28 AM, Josh Poimboeuf <jpoimboe@...hat.com> wrote:
>>> This standardizes the stacks of idle tasks to be consistent with other
>>> tasks on 32-bit.
>>
>> It might be nice to stick a ud2 or 1: hlt; jmp 1b or similar
>> afterwards to make it clear that initial_code can't return.
> 
> Yeah, I'll do something like that.
> 

"Standardizing the stack" how?  A zero on the stack terminates the stack
trace.

	-hpa