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45 lines
1.4 KiB
Diff
45 lines
1.4 KiB
Diff
From 7bab09631c2a303f87a7eb7e3d69e888673b9b7e Mon Sep 17 00:00:00 2001
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From: Vladis Dronov <vdronov@redhat.com>
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Date: Wed, 2 Aug 2017 19:50:14 +0200
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Subject: xfrm: policy: check policy direction value
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The 'dir' parameter in xfrm_migrate() is a user-controlled byte which is used
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as an array index. This can lead to an out-of-bound access, kernel lockup and
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DoS. Add a check for the 'dir' value.
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This fixes CVE-2017-11600.
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References: https://bugzilla.redhat.com/show_bug.cgi?id=1474928
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Fixes: 80c9abaabf42 ("[XFRM]: Extension for dynamic update of endpoint address(es)")
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Cc: <stable@vger.kernel.org> # v2.6.21-rc1
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Reported-by: "bo Zhang" <zhangbo5891001@gmail.com>
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Signed-off-by: Vladis Dronov <vdronov@redhat.com>
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Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
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---
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net/xfrm/xfrm_policy.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
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index ff61d85..6f5a0dad 100644
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--- a/net/xfrm/xfrm_policy.c
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+++ b/net/xfrm/xfrm_policy.c
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@@ -3308,9 +3308,15 @@ int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
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struct xfrm_state *x_new[XFRM_MAX_DEPTH];
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struct xfrm_migrate *mp;
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+ /* Stage 0 - sanity checks */
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if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
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goto out;
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+ if (dir >= XFRM_POLICY_MAX) {
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+ err = -EINVAL;
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+ goto out;
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+ }
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+
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/* Stage 1 - find policy */
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if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
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err = -ENOENT;
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--
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cgit v1.1
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