Messages in this thread | | | From | Jeff Moyer <> | Subject | Re: [PATCH 2/2] aio: fix kernel memory disclosure in io_getevents() introduced in v3.10 | Date | Tue, 24 Jun 2014 14:23:20 -0400 |
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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>
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