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Date: Fri, 19 Jan 2018 20:12:40 -0500
From: David Windsor <>
To: Kees Cook <>
Cc: Andrew Morton <>,
 Linus Torvalds <>,
 Michal Hocko <>, Ben Hutchings <>,
 Willy Tarreau <>, Hugh Dickins <>,
 Oleg Nesterov <>, "Jason A. Donenfeld" <>,
 Rik van Riel <>, Laura Abbott <>,
 Greg KH <>, Andy Lutomirski <>,
 Linux-MM <>, linux-arch <>,
 LKML <>,
Subject: Re: Re: [PATCH 0/3] exec: Pin stack limit during exec

I have some spare cycles; is there any more relevant information outside of this thread?


> On Jan 19, 2018, at 5:49 PM, Kees Cook <> wrote:
>> On Tue, Jan 9, 2018 at 12:23 PM, Kees Cook <> wrote:
>> Attempts to solve problems with the stack limit changing during exec
>> continue to be frustrated[1][2]. In addition to the specific issues
>> around the Stack Clash family of flaws, Andy Lutomirski pointed out[3]
>> other places during exec where the stack limit is used and is assumed
>> to be unchanging. Given the many places it gets used and the fact that
>> it can be manipulated/raced via setrlimit() and prlimit(), I think the
>> only way to handle this is to move away from the "current" view of the
>> stack limit and instead attach it to the bprm, and plumb this down into
>> the functions that need to know the stack limits. This series implements
>> the approach. I'd be curious to hear feedback on alternatives.
> Friendly ping -- looking for some people with spare cycles to look
> this over. If people want, I can toss it into -next as part of my kspp
> tree. It's been living happily in 0-day for  2 weeks...
> Thanks!
> -Kees
>> [1] 04e35f4495dd ("exec: avoid RLIMIT_STACK races with prlimit()")
>> [2] 779f4e1c6c7c ("Revert "exec: avoid RLIMIT_STACK races with prlimit()"")
>> [3] to, "Subject: existing rlimit races?"
> -- 
> Kees Cook
> Pixel Security

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