35 lines
1.3 KiB
Diff
35 lines
1.3 KiB
Diff
From: Andy Whitcroft <apw@canonical.com>
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Date: Thu, 23 Mar 2017 07:45:44 +0000
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Subject: [PATCH 2/2] xfrm_user: validate XFRM_MSG_NEWAE incoming ESN size
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harder
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Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2017-7184
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Kees Cook has pointed out that xfrm_replay_state_esn_len() is subject to
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wrapping issues. To ensure we are correctly ensuring that the two ESN
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structures are the same size compare both the overall size as reported
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by xfrm_replay_state_esn_len() and the internal length are the same.
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CVE-2017-7184
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Signed-off-by: Andy Whitcroft <apw@canonical.com>
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---
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net/xfrm/xfrm_user.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
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index 81c4112..87e0c22 100644
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--- a/net/xfrm/xfrm_user.c
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+++ b/net/xfrm/xfrm_user.c
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@@ -412,7 +412,11 @@ static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_es
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up = nla_data(rp);
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ulen = xfrm_replay_state_esn_len(up);
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- if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
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+ /* Check the overall length and the internal bitmap length to avoid
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+ * potential overflow. */
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+ if (nla_len(rp) < ulen ||
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+ xfrm_replay_state_esn_len(replay_esn) != ulen ||
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+ replay_esn->bmp_len != up->bmp_len)
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return -EINVAL;
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if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
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