Commit d90c9024 authored May 05, 2017 by Steffen Klassert

af_key: Fix slab-out-of-bounds in pfkey_compile_policy.



The sadb_x_sec_len is stored in the unit 'byte divided by eight'.
So we have to multiply this value by eight before we can do
size checks. Otherwise we may get a slab-out-of-bounds when
we memcpy the user sec_ctx.

Fixes: df71837d ("[LSM-IPSec]: Security association restriction.")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

parent 9b3eb541

net/key/af_key.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -3285,7 +3285,7 @@ static struct xfrm_policy pfkey_compile_policy(struct sock sk, int opt,
		p += pol->sadb_x_policy_len*8;
		sec_ctx = (struct sadb_x_sec_ctx *)p;
		if (len < pol->sadb_x_policy_len*8 +
		sec_ctx->sadb_x_sec_len) {
		sec_ctx->sadb_x_sec_len*8) {
		*dir = -EINVAL;
		goto out;
		}

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