Re: my slab cache broken on sparc64

David S. Miller (davem@redhat.com)
Fri, 03 May 2002 14:05:07 -0700 (PDT)


From: "Holzrichter, Bruce" <bruce.holzrichter@monster.com>
Date: Fri, 3 May 2002 14:18:55 -0500

I am trying to troubleshoot why in 2.5.13, (Though I also saw this in 2.5.7)
on my UltraSparc, why my slabcache is broken. Has anyone else seen this?

The technique used by the slabcache to verify to pointer
is %100 non-portable and totally wrong.

get_user() MUST be used only on "user pointers", it is being
used on a kernel pointer here.

It would work if the access was surrounded by:

old_fs = get_fs();
set_fs(KERNEL_DS);
... get_user(kernel_pointer) ...
set_fs (old_fs);

But it is not.
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