Benjamin LaHaise <bcrl@xxxxxxxxx> 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@xxxxxxxxxx>
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