| Message ID | 1404204711-9150-1-git-send-email-luis.henriques@canonical.com |
|---|---|
| State | New |
| Headers | show |
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;
This is a note to let you know that I have just added a patch titled aio: fix kernel memory disclosure in io_getevents() introduced in v3.10 to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.11.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From aada2e8ea56c868a760a6501878fd4336ec0c178 Mon Sep 17 00:00:00 2001 From: Benjamin LaHaise <bcrl@kvack.org> Date: Tue, 24 Jun 2014 13:32:51 -0400 Subject: 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> Cc: Mateusz Guzik <mguzik@redhat.com> Cc: Petr Matousek <pmatouse@redhat.com> Cc: Kent Overstreet <kmo@daterainc.com> Cc: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- fs/aio.c | 2 ++ 1 file changed, 2 insertions(+) -- 1.9.1