3.11.10.13 -stable review patch. If anyone has any objections, please let me
know.
------------------
From: Benjamin LaHaise <b...@kvack.org>
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.
[jmo...@redhat.com: backported to 3.10]
Signed-off-by: Benjamin LaHaise <b...@kvack.org>
Cc: Mateusz Guzik <mgu...@redhat.com>
Cc: Petr Matousek <pmato...@redhat.com>
Cc: Kent Overstreet <k...@daterainc.com>
Cc: Jeff Moyer <jmo...@redhat.com>
Signed-off-by: Luis Henriques <luis.henriq...@canonical.com>
---
fs/aio.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/aio.c b/fs/aio.c
index 48f02745b876..618021906aa9 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -719,6 +719,8 @@ 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;
--
1.9.1
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