From: Ulrich Drepper <drepper@redhat.com>
To: davidm@hpl.hp.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: Non-Exec stack patches
Date: Tue, 23 Mar 2004 17:20:12 -0800 [thread overview]
Message-ID: <4060E24C.9000507@redhat.com> (raw)
In-Reply-To: <16480.55450.730214.175997@napali.hpl.hp.com>
David Mosberger wrote:
> I guess I never quiet understood why an entire program header is
> needed for this, but that's just me.
This just means you haven't looked at the problem.
First, the ELF bits are limited and very crowded on some archs. There
is no central assignment so conflicts will happen.
And one single bit does not cut it. If you'd take a look, the
PT_GNU_STACK entry's permissions field specifies what permissions the
stack must have, not the presence of the field. So at least two bits
are needed which only adds to the problems of finding appropriate bits.
--
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
next prev parent reply other threads:[~2004-03-24 1:33 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-23 23:12 Non-Exec stack patches Kurt Garloff
2004-03-23 23:22 ` Ingo Molnar
2004-03-23 23:49 ` Andrew Morton
2004-03-24 0:21 ` Kurt Garloff
2004-03-24 0:38 ` David Mosberger
2004-03-24 1:20 ` Ulrich Drepper [this message]
2004-03-24 1:41 ` David Mosberger
2004-03-24 2:01 ` Ulrich Drepper
2004-03-24 7:09 ` David Mosberger
2004-03-24 7:00 ` Jakub Jelinek
2004-03-24 7:16 ` David Mosberger
2004-03-24 7:28 ` Jakub Jelinek
2004-03-24 7:45 ` David Mosberger
2004-03-24 16:29 ` John Reiser
2004-03-24 17:12 ` David Mosberger
2004-03-24 17:24 ` Jakub Jelinek
2004-03-24 18:01 ` David Mosberger
2004-03-24 19:02 ` John Reiser
2004-03-24 19:18 ` David Mosberger
2004-03-24 0:41 ` Andrew Morton
2004-03-24 0:41 ` Ingo Molnar
2004-03-24 10:53 ` Kurt Garloff
[not found] <1D3lO-3dh-13@gated-at.bofh.it>
[not found] ` <1D3YZ-3Gl-1@gated-at.bofh.it>
2004-03-24 6:01 ` Andi Kleen
2004-03-24 10:23 ` Stefan Smietanowski
2004-03-24 11:27 ` Andi Kleen
2004-03-24 22:03 ` Kurt Garloff
[not found] <20040324002149.GT4677@tpkurt.garloff.de.suse.lists.linux.kernel>
[not found] ` <16480.55450.730214.175997@napali.hpl.hp.com.suse.lists.linux.kernel>
[not found] ` <4060E24C.9000507@redhat.com.suse.lists.linux.kernel>
[not found] ` <16480.59229.808025.231875@napali.hpl.hp.com.suse.lists.linux.kernel>
[not found] ` <20040324070020.GI31589@devserv.devel.redhat.com.suse.lists.linux.kernel>
[not found] ` <16481.13780.673796.20976@napali.hpl.hp.com.suse.lists.linux.kernel>
[not found] ` <20040324072840.GK31589@devserv.devel.redhat.com.suse.lists.linux.kernel>
[not found] ` <16481.15493.591464.867776@napali.hpl.hp.com.suse.lists.linux.kernel>
[not found] ` <4061B764.5070008@BitWagon.com.suse.lists.linux.kernel>
[not found] ` <16481.49534.124281.434663@napali.hpl.hp.com.suse.lists.linux.kernel>
[not found] ` <20040324172454.GP31589@devserv.devel.redhat.com.suse.lists.linux.kernel>
2004-03-24 17:49 ` Andi Kleen
2004-03-24 17:54 ` Jakub Jelinek
-- strict thread matches above, loose matches on Subject: below --
2004-04-14 7:28 Siddha, Suresh B
2004-04-14 8:23 ` Jamie Lokier
2004-04-14 9:47 ` Jamie Lokier
2004-04-14 18:30 ` Kurt Garloff
2004-04-14 20:54 ` Jeff Dike
2004-04-14 8:45 Siddha, Suresh B
2004-04-14 9:38 ` Jamie Lokier
2004-04-14 19:14 Siddha, Suresh B
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