tree 9d3fafd62a272838fb2d140db27b03b4960df97e
parent 921b1130a9c76a9c88f8568b33faab083072879e
author Benjamin LaHaise <bcrl@kvack.org> 1403631171 -0400
committer Paul Mackerras <paulus@samba.org> 1408429532 +1000

aio: fix kernel memory disclosure in io_getevents() introduced in v3.10

commit edfbbf388f293d70bf4b7c0bc38774d05e6f711a upstream.

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.

[jmoyer@redhat.com: backported to 3.10]
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Cc: Mateusz Guzik <mguzik@redhat.com>
Cc: Petr Matousek <pmatouse@redhat.com>
Cc: Kent Overstreet <kmo@daterainc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(cherry picked from commit d36db46c2cba973557eb6138d22210c4e0cf17d6)
Signed-off-by: Paul Mackerras <paulus@samba.org>