From: David Woodhouse <dwmw2@infradead.org>
To: Scott Wood <scottwood@freescale.com>
Cc: linuxppc-dev@ozlabs.org, paulus@samba.org
Subject: Re: Executing from readablee, no-exec pages
Date: Fri, 06 Jul 2007 10:42:01 -0400 [thread overview]
Message-ID: <1183732922.2747.36.camel@shinybook.infradead.org> (raw)
In-Reply-To: <468D68D4.4050704@freescale.com>
On Thu, 2007-07-05 at 16:55 -0500, Scott Wood wrote:
> To maintain compatibility with these versions, we could change the test
> in do_page_fault() to include VM_READ as well as VM_EXEC on targets that
> don't have a separate exec-bit in hardware (are there any powerpc mmus
> that do?).
64-bit implementations since POWER4 have separate exec permissions,
don't they? So any userspace which tries to execute non-executable pages
is already broken when running on a ppc64 machine; I wouldn't worry too
much about letting it break on ppc32 too.
We already use vDSO signal trampolines even on the 32-bit kernel, right?
--
dwmw2
next prev parent reply other threads:[~2007-07-06 14:41 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
2007-07-06 14:42 ` David Woodhouse [this message]
2007-07-07 2:33 ` Benjamin Herrenschmidt
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