Re: [PATCH] Fix mmap_kmem (was: [question] What's the difference between /dev/kmem and /dev/mem)
From: Andi Kleen (ak_at_suse.de)
Date: 08/12/05
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To: Linus Torvalds <torvalds@osdl.org> Date: 12 Aug 2005 18:54:49 +0200
Linus Torvalds <torvalds@osdl.org> writes:
>
> I'm actually more inclined to try to deprecate /dev/kmem.. I don't think
> anybody has ever really used it except for some rootkits.
I don't think that's true.
> So I'd be perfectly happy to fix this, but I'd be even happier if we made
> the whole kmem thing a config variable (maybe even default it to "off").
Acessing vmalloc in /dev/mem would be pretty awkward. Yes it doesn't
also work in mmap of /dev/kmem, but at least in read/write.
There are quite a lot of scripts that use it for kernel debugging
like dumping variables. And for that you really want to access modules
and vmalloc. And it's much easier to parse than /proc/kcore
In fact I have some patches queued to fix it for x86-64 again
(people who used such scripts on i386 are complaining)
-Andi
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- Previous message: Luca Falavigna: "Re: kexec and frame buffer"
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- Reply: Arjan van de Ven: "Re: [PATCH] Fix mmap_kmem (was: [question] What's the difference between /dev/kmem and /dev/mem)"
- Reply: Ingo Oeser: "Re: [PATCH] Fix mmap_kmem (was: [question] What's the difference between /dev/kmem and /dev/mem)"
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