From: Benjamin LaHaise <[email protected]> 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.
[[email protected]: backported to 3.10] Signed-off-by: Benjamin LaHaise <[email protected]> Signed-off-by: Jeff Moyer <[email protected]> Cc: Mateusz Guzik <[email protected]> Cc: Petr Matousek <[email protected]> Cc: Kent Overstreet <[email protected]> Cc: [email protected] --- aio.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/aio.c b/fs/aio.c index e66b948..872fd26 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -717,6 +717,8 @@ static long aio_read_events_ring(struct kioctx *ctx, if (head == ctx->tail) goto out; + head %= ctx->nr_events; + while (ret < nr) { long avail; struct io_event *ev; -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
