This is a note to let you know that I've just added the patch titled
aio: fix kernel memory disclosure in io_getevents() introduced in v3.10
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
aio-fix-kernel-memory-disclosure-in-io_getevents-introduced-in-v3.10.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From edfbbf388f293d70bf4b7c0bc38774d05e6f711a Mon Sep 17 00:00:00 2001
From: Benjamin LaHaise <bcrl@xxxxxxxxx>
Date: Tue, 24 Jun 2014 13:32:51 -0400
Subject: aio: fix kernel memory disclosure in io_getevents() introduced in v3.10
From: Benjamin LaHaise <bcrl@xxxxxxxxx>
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.
Signed-off-by: Benjamin LaHaise <bcrl@xxxxxxxxx>
Cc: Mateusz Guzik <mguzik@xxxxxxxxxx>
Cc: Petr Matousek <pmatouse@xxxxxxxxxx>
Cc: Kent Overstreet <kmo@xxxxxxxxxxxxx>
Cc: Jeff Moyer <jmoyer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/aio.c | 3 +++
1 file changed, 3 insertions(+)
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1063,6 +1063,9 @@ static long aio_read_events_ring(struct
if (head == tail)
goto out;
+ head %= ctx->nr_events;
+ tail %= ctx->nr_events;
+
while (ret < nr) {
long avail;
struct io_event *ev;
Patches currently in stable-queue which might be from bcrl@xxxxxxxxx are
queue-3.15/aio-fix-kernel-memory-disclosure-in-io_getevents-introduced-in-v3.10.patch
queue-3.15/aio-fix-aio-request-leak-when-events-are-reaped-by-userspace.patch
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