Date: Fri, 19 Jan 2018 14:49:20 -0800 From: Kees Cook <keescook@...omium.org> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Kees Cook <keescook@...omium.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Michal Hocko <mhocko@...nel.org>, Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>, Hugh Dickins <hughd@...gle.com>, Oleg Nesterov <oleg@...hat.com>, "Jason A. Donenfeld" <Jason@...c4.com>, Rik van Riel <riel@...hat.com>, Laura Abbott <labbott@...hat.com>, Greg KH <greg@...ah.com>, Andy Lutomirski <luto@...nel.org>, Linux-MM <linux-mm@...ck.org>, linux-arch <linux-arch@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, kernel-hardening@...ts.openwall.com Subject: Re: [PATCH 0/3] exec: Pin stack limit during exec On Tue, Jan 9, 2018 at 12:23 PM, Kees Cook <keescook@...omium.org> wrote: > Attempts to solve problems with the stack limit changing during exec > continue to be frustrated. In addition to the specific issues > around the Stack Clash family of flaws, Andy Lutomirski pointed out > 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 >  04e35f4495dd ("exec: avoid RLIMIT_STACK races with prlimit()") >  779f4e1c6c7c ("Revert "exec: avoid RLIMIT_STACK races with prlimit()"") >  to security@...nel.org, "Subject: existing rlimit races?" -- Kees Cook Pixel Security
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.