From: Steffen Klassert <steffen.klassert@secunet•com>
To: David Miller <davem@davemloft•net>
Cc: Herbert Xu <herbert@gondor•apana.org.au>,
Steffen Klassert <steffen.klassert@secunet•com>,
<netdev@vger•kernel.org>
Subject: [PATCH 04/11] af_key: fix buffer overread in parse_exthdrs()
Date: Thu, 11 Jan 2018 12:37:39 +0100 [thread overview]
Message-ID: <20180111113746.28186-5-steffen.klassert@secunet.com> (raw)
In-Reply-To: <20180111113746.28186-1-steffen.klassert@secunet.com>
From: Eric Biggers <ebiggers@google•com>
If a message sent to a PF_KEY socket ended with an incomplete extension
header (fewer than 4 bytes remaining), then parse_exthdrs() read past
the end of the message, into uninitialized memory. Fix it by returning
-EINVAL in this case.
Reproducer:
#include <linux/pfkeyv2.h>
#include <sys/socket.h>
#include <unistd.h>
int main()
{
int sock = socket(PF_KEY, SOCK_RAW, PF_KEY_V2);
char buf[17] = { 0 };
struct sadb_msg *msg = (void *)buf;
msg->sadb_msg_version = PF_KEY_V2;
msg->sadb_msg_type = SADB_DELETE;
msg->sadb_msg_len = 2;
write(sock, buf, 17);
}
Cc: stable@vger•kernel.org
Signed-off-by: Eric Biggers <ebiggers@google•com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet•com>
---
net/key/af_key.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 596499cc8b2f..d40861a048fe 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -516,6 +516,9 @@ static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void *
uint16_t ext_type;
int ext_len;
+ if (len < sizeof(*ehdr))
+ return -EINVAL;
+
ext_len = ehdr->sadb_ext_len;
ext_len *= sizeof(uint64_t);
ext_type = ehdr->sadb_ext_type;
--
2.14.1
next prev parent reply other threads:[~2018-01-11 11:37 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-11 11:37 pull request (net): ipsec 2018-01-11 Steffen Klassert
2018-01-11 11:37 ` [PATCH 01/11] xfrm: Forbid state updates from changing encap type Steffen Klassert
2018-01-11 11:37 ` [PATCH 02/11] xfrm: skip policies marked as dead while rehashing Steffen Klassert
2018-01-11 11:37 ` [PATCH 03/11] af_key: fix buffer overread in verify_address_len() Steffen Klassert
2018-01-11 11:37 ` Steffen Klassert [this message]
2018-01-11 11:37 ` [PATCH 05/11] xfrm: fix rcu usage in xfrm_get_type_offload Steffen Klassert
2018-01-11 11:37 ` [PATCH 06/11] xfrm: Use __skb_queue_tail in xfrm_trans_queue Steffen Klassert
2018-01-11 11:37 ` [PATCH 07/11] xfrm: Return error on unknown encap_type in init_state Steffen Klassert
2018-01-11 11:37 ` [PATCH 08/11] xfrm: don't call xfrm_policy_cache_flush while holding spinlock Steffen Klassert
2018-01-11 11:37 ` [PATCH 09/11] esp: Fix GRO when the headers not fully in the linear part of the skb Steffen Klassert
2018-01-11 11:37 ` [PATCH 10/11] af_key: Fix memory leak in key_notify_policy Steffen Klassert
2018-01-11 11:37 ` [PATCH 11/11] xfrm: Fix a race in the xdst pcpu cache Steffen Klassert
2018-01-12 15:33 ` pull request (net): ipsec 2018-01-11 David Miller
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