Messages in this thread | | | Date | 21 Mar 2005 20:37:03 +0100 | Date | Mon, 21 Mar 2005 20:37:03 +0100 | From | Andi Kleen <> | Subject | Re: [BUG?] x86_64 : Can not read /dev/kmem ? |
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Sorry for the late answer.
On Mon, Mar 14, 2005 at 11:37:19AM +0100, Eric Dumazet wrote: > > Hi Andi > > I tried to read /dev/kmem on x86_64 (linux-2.6.11) and got no success. > > read() or pread() returns EINVAL
Yes. I fixed this once for 2.4, but somehow the changes never made it into 2.6. The VFS code doesn't like negative offsets, and the kernel addresses are negative.
> > I tried mmap() too : mmap() calls succeed, but as soon the user process > dereference memory, we get :
Hmm, looks like a bug yes. I can reproduce it. Thanks for the report. Will investigate later.
-Andi
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