From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Scott Wood <scottwood@freescale.com>
Cc: linuxppc-dev@ozlabs.org, paulus@samba.org
Subject: Re: Executing from readablee, no-exec pages
Date: Sat, 07 Jul 2007 12:33:32 +1000 [thread overview]
Message-ID: <1183775612.3388.193.camel@localhost.localdomain> (raw)
In-Reply-To: <20070706164942.GA10806@ld0162-tx32.am.freescale.net>
> Well, it means that leaving VM_READ out of the check (except where the
> hardware PTE has an exec bit) isn't really buying us anything
> security-wise (especially since the primary reason for no-exec protection
> is to avoid code injections via stack overflow, and those pages will
> usually already be present), so it doesn't hurt much to let things keep
> working.
>
> At the least, I'd like it to keep working for a few more kernel releases
> (with a warning printed when a VM_EXEC-only test would have failed), so
> people have time to upgrade glibc.
I agree. Care to send a patch ? :-0
Ben.
next prev parent reply other threads:[~2007-07-07 2:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-05 21:55 Executing from readablee, no-exec pages Scott Wood
2007-07-05 22:38 ` Rodrigo Rubira Branco
2007-07-06 11:18 ` Johannes Berg
2007-07-06 13:36 ` Segher Boessenkool
2007-07-06 13:43 ` Johannes Berg
2007-07-06 13:24 ` Segher Boessenkool
2007-07-06 16:49 ` Scott Wood
2007-07-07 2:33 ` Benjamin Herrenschmidt [this message]
2007-07-06 14:42 ` David Woodhouse
2007-07-07 2:33 ` Benjamin Herrenschmidt
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