Messages in this thread | | | Date | Tue, 24 Jun 2014 14:39:18 -0400 | From | Benjamin LaHaise <> | Subject | Re: [PATCH 2/2] aio: fix kernel memory disclosure in io_getevents() introduced in v3.10 |
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On Tue, Jun 24, 2014 at 02:23:20PM -0400, Jeff Moyer wrote: > Benjamin LaHaise <bcrl@kvack.org> writes: > > > A kernel memory disclosure was introduced in aio_read_events_ring() in v3.10 > > by commit a31ad380bed817aa25f8830ad23e1a0480fef797. The changes made to > > aio_read_events_ring() failed to correctly limit the index into > > ctx->ring_pages[], allowing an attacked to cause the subsequent kmap() of > > an arbitrary page with a copy_to_user() to copy the contents into userspace. > > This vulnerability has been assigned CVE-2014-0206. Thanks to Mateusz and > > Petr for disclosing this issue. > > > > This patch applies to v3.12+. A separate backport is needed for 3.10/3.11. > > Note that a 3.10 backport will need to remove this line from free_ioctx > as well: > atomic_sub(avail, &ctx->reqs_active); > > Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Can you post the backport for 3.10 so the -stable folks have something they can use that was tested? Cheers,
-ben -- "Thought is the essence of where you are now."
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