From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Bernhard Walle <bwalle@suse.de>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: [PATCH 2/2] Add dev.mem.restricted sysctl
Date: Sun, 16 Nov 2008 00:12:37 +0000 [thread overview]
Message-ID: <20081116001237.77e60caf@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <20081116010914.1285b884@kopernikus.site>
> Well, I think that option makes sense to protect the system
> from processes that *accidentally* read/write to the wrong memory
> location (like the X server that always runs as root).
Older X drivers very carefully only map the memory they need. They also
unmap and remap as well as using iopl/ioperm ranges to avoid such
accidents. Newer ones are all DMA command chains and stuff so it won't
make one iota of difference.
next prev parent reply other threads:[~2008-11-16 0:12 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-16 0:03 [RFC] " Bernhard Walle
2008-11-16 0:03 ` [PATCH 1/2] Unify devmem_is_allowed across architectures Bernhard Walle
2008-11-16 0:03 ` [PATCH 2/2] Add dev.mem.restricted sysctl Bernhard Walle
2008-11-16 0:07 ` Alan Cox
2008-11-16 0:09 ` Bernhard Walle
2008-11-16 0:12 ` Alan Cox [this message]
2008-11-16 0:11 ` Bernhard Walle
2008-11-16 0:33 ` Alexey Dobriyan
2008-11-16 9:28 ` Bernhard Walle
2008-11-16 10:13 ` Alexey Dobriyan
2008-11-16 3:49 ` Arjan van de Ven
2008-11-16 9:30 ` Bernhard Walle
2008-11-16 9:36 ` Arjan van de Ven
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