| Message ID | tencent_6BA2BE4A64DD6CD5B66D9D8079789829000A@qq.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | mac802154: Fix uninit-value access in ieee802154_hdr_push_sechdr | expand |
diff --git a/net/mac802154/iface.c b/net/mac802154/iface.c index c0e2da5072be..c99b6e40a5db 100644 --- a/net/mac802154/iface.c +++ b/net/mac802154/iface.c @@ -368,7 +368,6 @@ static int ieee802154_header_create(struct sk_buff *skb, memset(&hdr.fc, 0, sizeof(hdr.fc)); hdr.fc.type = cb->type; - hdr.fc.security_enabled = cb->secen; hdr.fc.ack_request = cb->ackreq; hdr.seq = atomic_inc_return(&dev->ieee802154_ptr->dsn) & 0xFF;
The syzkaller reported an issue: BUG: KMSAN: uninit-value in ieee802154_hdr_push_sechdr net/ieee802154/header_ops.c:54 [inline] BUG: KMSAN: uninit-value in ieee802154_hdr_push+0x971/0xb90 net/ieee802154/header_ops.c:108 ieee802154_hdr_push_sechdr net/ieee802154/header_ops.c:54 [inline] ieee802154_hdr_push+0x971/0xb90 net/ieee802154/header_ops.c:108 ieee802154_header_create+0x9c0/0xc00 net/mac802154/iface.c:396 wpan_dev_hard_header include/net/cfg802154.h:494 [inline] dgram_sendmsg+0xd1d/0x1500 net/ieee802154/socket.c:677 ieee802154_sock_sendmsg+0x91/0xc0 net/ieee802154/socket.c:96 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg net/socket.c:748 [inline] ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2494 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2548 __sys_sendmsg+0x225/0x3c0 net/socket.c:2577 __compat_sys_sendmsg net/compat.c:346 [inline] __do_compat_sys_sendmsg net/compat.c:353 [inline] __se_compat_sys_sendmsg net/compat.c:350 [inline] We found hdr->key_id_mode is uninitialized in mac802154_set_header_security() which indicates hdr.fc.security_enabled should be 0. However, it is set to be cb->secen before. Later, ieee802154_hdr_push_sechdr is invoked, causing KMSAN complains uninit-value issue. Since mac802154_set_header_security() sets hdr.fc.security_enabled based on the variables ieee802154_sub_if_data *sdata and ieee802154_mac_cb *cb in a collaborative manner. Therefore, we should not set security_enabled prior to mac802154_set_header_security(). Fixed it by removing the line that sets the hdr.fc.security_enabled. Syzkaller don't provide repro, and I provide a syz repro like: r0 = syz_init_net_socket$802154_dgram(0x24, 0x2, 0x0) setsockopt$WPAN_SECURITY(r0, 0x0, 0x1, &(0x7f0000000000)=0x2, 0x4) setsockopt$WPAN_SECURITY(r0, 0x0, 0x1, &(0x7f0000000080), 0x4) sendmsg$802154_dgram(r0, &(0x7f0000000100)={&(0x7f0000000040)={0x24, @short}, 0x14, &(0x7f00000000c0)={0x0}}, 0x0) Fixes: 32edc40ae65c ("ieee802154: change _cb handling slightly") Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com> --- net/mac802154/iface.c | 1 - 1 file changed, 1 deletion(-)