Dear Kees,
Am 24.07.20 um 19:33 schrieb Kees Cook:
On Fri, Jul 24, 2020 at 09:45:18AM +0200, Paul Menzel wrote:
Am 24.07.20 um 00:32 schrieb Kees Cook:
On Thu, Jul 23, 2020 at 09:10:15PM +0000, Mazin Rezk wrote:
As Linux 5.8-rc7 is going to be released this Sunday, I wonder, if commit
3202fa62f ("slub: relocate freelist pointer to middle of object") should be
reverted for now to fix the regression for the users according to Linux’ no
regression policy. Once the AMDGPU/DRM driver issue is fixed, it can be
reapplied. I know it’s not optimal, but as some testing is going to be
involved for the fix, I’d argue it’s the best option for the users.
Well, the SLUB defense was already released in v5.7, so I'm not sure it
really helps for amdgpu_dm users seeing it there too.
In my opinion, it would help, as the stable release could pick up the
revert, ones it’s in Linus’ master branch.
There was a fix to disable the async path for this driver that worked
around the bug too, yes? That seems like a safer and more focused
change that doesn't revert the SLUB defense for all users, and would
actually provide a complete, I think, workaround whereas reverting
the SLUB change means the race still exists. For example, it would be
hit with slab poisoning, etc.
I do not know. If there is such a fix, that would be great. But if you
do not know, how should a normal user? ;-)
Kind regards,
Paul
Kind regards,
Paul
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