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46 lines
1.5 KiB
Diff
46 lines
1.5 KiB
Diff
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From d36db46c2cba973557eb6138d22210c4e0cf17d6 Mon Sep 17 00:00:00 2001
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From: Benjamin LaHaise <bcrl@kvack.org>
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Date: Tue, 24 Jun 2014 13:32:51 -0400
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Subject: aio: fix kernel memory disclosure in io_getevents() introduced in
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v3.10
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commit edfbbf388f293d70bf4b7c0bc38774d05e6f711a upstream.
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A kernel memory disclosure was introduced in aio_read_events_ring() in v3.10
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by commit a31ad380bed817aa25f8830ad23e1a0480fef797. The changes made to
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aio_read_events_ring() failed to correctly limit the index into
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ctx->ring_pages[], allowing an attacked to cause the subsequent kmap() of
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an arbitrary page with a copy_to_user() to copy the contents into userspace.
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This vulnerability has been assigned CVE-2014-0206. Thanks to Mateusz and
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Petr for disclosing this issue.
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This patch applies to v3.12+. A separate backport is needed for 3.10/3.11.
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[jmoyer@redhat.com: backported to 3.10]
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Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
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Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
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Cc: Mateusz Guzik <mguzik@redhat.com>
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Cc: Petr Matousek <pmatouse@redhat.com>
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Cc: Kent Overstreet <kmo@daterainc.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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fs/aio.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/fs/aio.c b/fs/aio.c
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index 8d2c997..ded94c4 100644
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--- a/fs/aio.c
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+++ b/fs/aio.c
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@@ -717,6 +717,8 @@ static long aio_read_events_ring(struct kioctx *ctx,
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if (head == ctx->tail)
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goto out;
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+ head %= ctx->nr_events;
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+
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while (ret < nr) {
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long avail;
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struct io_event *ev;
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--
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cgit v1.1
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