From: Joe Buck <Joe.Buck@synopsys.COM>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: "Richard Guenther" <richard.guenther@gmail.com>,
"David Daney" <ddaney@caviumnetworks.com>,
"gcc@gcc.gnu.org" <gcc@gcc.gnu.org>,
"Jamie Lokier" <jamie@shareable.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Subject: Re: [PATCH] ARM: Convert BUG() to use unreachable()
Date: Thu, 17 Dec 2009 19:14:00 -0000 [thread overview]
Message-ID: <20091217191401.GD10707@synopsys.com> (raw)
In-Reply-To: <20091217190613.GB4440@n2100.arm.linux.org.uk>
On Thu, Dec 17, 2009 at 11:06:13AM -0800, Russell King - ARM Linux wrote:
> On Thu, Dec 17, 2009 at 10:35:17AM -0800, Joe Buck wrote:
> > Besides, didn't I see a whole bunch of kernel security patches related
> > to null pointer dereferences lately? If page 0 can be mapped, you
> > suddenly won't get your trap.
>
> Page 0 can not be mapped on ARM kernels since the late 1990s, and this
> protection is independent of the generic kernel.
>
> Milage may vary on other architectures, but that's not a concern here.
I don't understand, though, why you would want to implement a generally
useful facility (make the kernel trap so you can do a post-mortem
analysis) in a way that's only safe for the ARM port.
next prev parent reply other threads:[~2009-12-17 19:14 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1260266138-17684-1-git-send-email-u.kleine-koenig@pengutronix.de>
[not found] ` <20091217150120.GD24967@shareable.org>
2009-12-17 17:12 ` David Daney
2009-12-17 17:17 ` Richard Guenther
2009-12-17 18:21 ` Russell King - ARM Linux
2009-12-17 18:35 ` Joe Buck
2009-12-17 19:06 ` Russell King - ARM Linux
2009-12-17 19:14 ` Joe Buck [this message]
2009-12-17 19:33 ` Russell King - ARM Linux
2009-12-17 19:34 ` David Daney
2009-12-17 19:38 ` Jamie Lokier
2009-12-17 19:49 ` Russell King - ARM Linux
2009-12-17 19:58 ` Russell King - ARM Linux
2009-12-17 19:05 ` Jamie Lokier
2009-12-21 19:31 ` Richard Henderson
2009-12-21 20:12 ` Russell King - ARM Linux
2009-12-22 13:52 ` Dave Korn
2009-12-22 14:12 ` Russell King - ARM Linux
2009-12-22 14:33 ` Dave Korn
2009-12-22 11:33 ` Paolo Bonzini
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