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authorPavel Skripkin <paskripkin@gmail.com>2021-07-25 00:11:59 +0300
committerDavid S. Miller <davem@davemloft.net>2021-07-27 13:05:56 +0100
commitc7c9d2102c9c098916ab9e0ab248006107d00d6c (patch)
tree5ddc2a37ffd3d60faf85893f4ab06045e44d5327 /include
parentfcef709c2c4baf758950bd7395e4b10527b81e2c (diff)
net: llc: fix skb_over_panic
Syzbot reported skb_over_panic() in llc_pdu_init_as_xid_cmd(). The problem was in wrong LCC header manipulations. Syzbot's reproducer tries to send XID packet. llc_ui_sendmsg() is doing following steps: 1. skb allocation with size = len + header size len is passed from userpace and header size is 3 since addr->sllc_xid is set. 2. skb_reserve() for header_len = 3 3. filling all other space with memcpy_from_msg() Ok, at this moment we have fully loaded skb, only headers needs to be filled. Then code comes to llc_sap_action_send_xid_c(). This function pushes 3 bytes for LLC PDU header and initializes it. Then comes llc_pdu_init_as_xid_cmd(). It initalizes next 3 bytes *AFTER* LLC PDU header and call skb_push(skb, 3). This looks wrong for 2 reasons: 1. Bytes rigth after LLC header are user data, so this function was overwriting payload. 2. skb_push(skb, 3) call can cause skb_over_panic() since all free space was filled in llc_ui_sendmsg(). (This can happen is user passed 686 len: 686 + 14 (eth header) + 3 (LLC header) = 703. SKB_DATA_ALIGN(703) = 704) So, in this patch I added 2 new private constansts: LLC_PDU_TYPE_U_XID and LLC_PDU_LEN_U_XID. LLC_PDU_LEN_U_XID is used to correctly reserve header size to handle LLC + XID case. LLC_PDU_TYPE_U_XID is used by llc_pdu_header_init() function to push 6 bytes instead of 3. And finally I removed skb_push() call from llc_pdu_init_as_xid_cmd(). This changes should not affect other parts of LLC, since after all steps we just transmit buffer. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reported-and-tested-by: syzbot+5e5a981ad7cc54c4b2b4@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin <paskripkin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/llc_pdu.h31
1 files changed, 23 insertions, 8 deletions
diff --git a/include/net/llc_pdu.h b/include/net/llc_pdu.h
index c0f0a13ed818..49aa79c7b278 100644
--- a/include/net/llc_pdu.h
+++ b/include/net/llc_pdu.h
@@ -15,9 +15,11 @@
#include <linux/if_ether.h>
/* Lengths of frame formats */
-#define LLC_PDU_LEN_I 4 /* header and 2 control bytes */
-#define LLC_PDU_LEN_S 4
-#define LLC_PDU_LEN_U 3 /* header and 1 control byte */
+#define LLC_PDU_LEN_I 4 /* header and 2 control bytes */
+#define LLC_PDU_LEN_S 4
+#define LLC_PDU_LEN_U 3 /* header and 1 control byte */
+/* header and 1 control byte and XID info */
+#define LLC_PDU_LEN_U_XID (LLC_PDU_LEN_U + sizeof(struct llc_xid_info))
/* Known SAP addresses */
#define LLC_GLOBAL_SAP 0xFF
#define LLC_NULL_SAP 0x00 /* not network-layer visible */
@@ -50,9 +52,10 @@
#define LLC_PDU_TYPE_U_MASK 0x03 /* 8-bit control field */
#define LLC_PDU_TYPE_MASK 0x03
-#define LLC_PDU_TYPE_I 0 /* first bit */
-#define LLC_PDU_TYPE_S 1 /* first two bits */
-#define LLC_PDU_TYPE_U 3 /* first two bits */
+#define LLC_PDU_TYPE_I 0 /* first bit */
+#define LLC_PDU_TYPE_S 1 /* first two bits */
+#define LLC_PDU_TYPE_U 3 /* first two bits */
+#define LLC_PDU_TYPE_U_XID 4 /* private type for detecting XID commands */
#define LLC_PDU_TYPE_IS_I(pdu) \
((!(pdu->ctrl_1 & LLC_PDU_TYPE_I_MASK)) ? 1 : 0)
@@ -230,9 +233,18 @@ static inline struct llc_pdu_un *llc_pdu_un_hdr(struct sk_buff *skb)
static inline void llc_pdu_header_init(struct sk_buff *skb, u8 type,
u8 ssap, u8 dsap, u8 cr)
{
- const int hlen = type == LLC_PDU_TYPE_U ? 3 : 4;
+ int hlen = 4; /* default value for I and S types */
struct llc_pdu_un *pdu;
+ switch (type) {
+ case LLC_PDU_TYPE_U:
+ hlen = 3;
+ break;
+ case LLC_PDU_TYPE_U_XID:
+ hlen = 6;
+ break;
+ }
+
skb_push(skb, hlen);
skb_reset_network_header(skb);
pdu = llc_pdu_un_hdr(skb);
@@ -374,7 +386,10 @@ static inline void llc_pdu_init_as_xid_cmd(struct sk_buff *skb,
xid_info->fmt_id = LLC_XID_FMT_ID; /* 0x81 */
xid_info->type = svcs_supported;
xid_info->rw = rx_window << 1; /* size of receive window */
- skb_put(skb, sizeof(struct llc_xid_info));
+
+ /* no need to push/put since llc_pdu_header_init() has already
+ * pushed 3 + 3 bytes
+ */
}
/**