linux-kernel - Re: [RFC] [PATCH 0/5 V2] Huge page backed user-space stacks

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]

Message-ID: <20080728212354.GB8450@us.ibm.com>
Date:	Mon, 28 Jul 2008 14:23:54 -0700
From:	Eric B Munson <ebmunson@...ibm.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, libhugetlbfs-devel@...ts.sourceforge.net
Subject: Re: [RFC] [PATCH 0/5 V2] Huge page backed user-space stacks

On Mon, 28 Jul 2008, Dave Hansen wrote:

> On Mon, 2008-07-28 at 12:17 -0700, Eric Munson wrote:
> > 
> > This patch stack introduces a personality flag that indicates the
> > kernel
> > should setup the stack as a hugetlbfs-backed region. A userspace
> > utility
> > may set this flag then exec a process whose stack is to be backed by
> > hugetlb pages.
> 
> I didn't see it mentioned here, but these stacks are fixed-size, right?
> They can't actually grow and are fixed in size at exec() time, right?
> 
> -- Dave

The stack VMA is a fixed size but the pages will be faulted in as needed.

-- 
Eric B Munson
IBM Linux Technology Center
ebmunson@...ibm.com


Download attachment "signature.asc" of type "application/pgp-signature" (190 bytes)