From: Joe.Buck@synopsys.COM (Joe Buck)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: Convert BUG() to use unreachable()
Date: Thu, 17 Dec 2009 11:14:01 -0800 [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: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-08 9:55 [PATCH] ARM: Convert BUG() to use unreachable() Uwe Kleine-König
2009-12-10 17:50 ` Russell King - ARM Linux
[not found] ` <4B213627.5000007@caviumnetworks.com>
2009-12-16 13:58 ` Uwe Kleine-König
2009-12-17 15:01 ` Jamie Lokier
[not found] ` <4B2A65C6.7080009@caviumnetworks.com>
2009-12-17 17:17 ` Richard Guenther
2009-12-17 18:17 ` 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 19:38 ` Jamie Lokier
2009-12-17 19:48 ` Russell King - ARM Linux
2009-12-17 19:58 ` Russell King - ARM Linux
2009-12-17 19:04 ` Jamie Lokier
2009-12-21 19:30 ` Richard Henderson
2009-12-21 20:10 ` Russell King - ARM Linux
2009-12-22 14:09 ` Dave Korn
2009-12-22 14:12 ` Russell King - ARM Linux
2009-12-22 14:49 ` Dave Korn
2009-12-22 11:33 ` Paolo Bonzini
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