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
| ||
|
Date: Mon, 10 Jul 2017 14:29:45 -0400 From: Rik van Riel <riel@...hat.com> To: Michal Hocko <mhocko@...nel.org>, Kees Cook <keescook@...omium.org> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Andy Lutomirski <luto@...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>, Larry Woodman <lwoodman@...hat.com>, "Kirill A. Shutemov" <kirill@...temov.name>, Tony Luck <tony.luck@...el.com>, "James E.J. Bottomley" <jejb@...isc-linux.org>, Helge Diller <deller@....de>, James Hogan <james.hogan@...tec.com>, Laura Abbott <labbott@...hat.com>, Greg KH <greg@...ah.com>, "security@...nel.org" <security@...nel.org>, Qualys Security Advisory <qsa@...lys.com>, LKML <linux-kernel@...r.kernel.org>, Ximin Luo <infinity0@...ian.org> Subject: Re: [RFC][PATCH] exec: Use init rlimits for setuid exec On Mon, 2017-07-10 at 20:16 +0200, Michal Hocko wrote: > OK, I misread the code. 32b applications on 64b systems do top down > by > default and only if they override this by ADDR_COMPAT_LAYOUT > personality. For some reason I thought that 32b userspace goes a > different path and makes sure that they are always doing bottom up. > > Anyway even if somebody really needs to grow stack really large we > have > the personality to give them the legacy layout. I think what will happen when rlimit_stack is RLIMIT_INFINITY is that mmap_base will end up placing mm->mmap_base at 512MB (task_size / 6 * 5 below the top of address space) for 32 bit kernels, and we eventually fall back to a bottom-up search if the space below mmap_base is exhausted (if it ever is).
Powered by blists - more mailing lists