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Eric Dumazet 989b0ff35f net: prevent mss overflow in skb_segment() 
commit 23d05d563b upstream.

Once again syzbot is able to crash the kernel in skb_segment() [1]

GSO_BY_FRAGS is a forbidden value, but unfortunately the following
computation in skb_segment() can reach it quite easily :

	mss = mss * partial_segs;

65535 = 3 * 5 * 17 * 257, so many initial values of mss can lead to
a bad final result.

Make sure to limit segmentation so that the new mss value is smaller
than GSO_BY_FRAGS.

[1]

general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077]
CPU: 1 PID: 5079 Comm: syz-executor993 Not tainted 6.7.0-rc4-syzkaller-00141-g1ae4cd3cbdd0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:skb_segment+0x181d/0x3f30 net/core/skbuff.c:4551
Code: 83 e3 02 e9 fb ed ff ff e8 90 68 1c f9 48 8b 84 24 f8 00 00 00 48 8d 78 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8a 21 00 00 48 8b 84 24 f8 00
RSP: 0018:ffffc900043473d0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000010046 RCX: ffffffff886b1597
RDX: 000000000000000e RSI: ffffffff886b2520 RDI: 0000000000000070
RBP: ffffc90004347578 R08: 0000000000000005 R09: 000000000000ffff
R10: 000000000000ffff R11: 0000000000000002 R12: ffff888063202ac0
R13: 0000000000010000 R14: 000000000000ffff R15: 0000000000000046
FS: 0000555556e7e380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020010000 CR3: 0000000027ee2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
udp6_ufo_fragment+0xa0e/0xd00 net/ipv6/udp_offload.c:109
ipv6_gso_segment+0x534/0x17e0 net/ipv6/ip6_offload.c:120
skb_mac_gso_segment+0x290/0x610 net/core/gso.c:53
__skb_gso_segment+0x339/0x710 net/core/gso.c:124
skb_gso_segment include/net/gso.h:83 [inline]
validate_xmit_skb+0x36c/0xeb0 net/core/dev.c:3626
__dev_queue_xmit+0x6f3/0x3d60 net/core/dev.c:4338
dev_queue_xmit include/linux/netdevice.h:3134 [inline]
packet_xmit+0x257/0x380 net/packet/af_packet.c:276
packet_snd net/packet/af_packet.c:3087 [inline]
packet_sendmsg+0x24c6/0x5220 net/packet/af_packet.c:3119
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0xd5/0x180 net/socket.c:745
__sys_sendto+0x255/0x340 net/socket.c:2190
__do_sys_sendto net/socket.c:2202 [inline]
__se_sys_sendto net/socket.c:2198 [inline]
__x64_sys_sendto+0xe0/0x1b0 net/socket.c:2198
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f8692032aa9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff8d685418 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8692032aa9
RDX: 0000000000010048 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00000000000f4240 R08: 0000000020000540 R09: 0000000000000014
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff8d685480
R13: 0000000000000001 R14: 00007fff8d685480 R15: 0000000000000003
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_segment+0x181d/0x3f30 net/core/skbuff.c:4551
Code: 83 e3 02 e9 fb ed ff ff e8 90 68 1c f9 48 8b 84 24 f8 00 00 00 48 8d 78 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8a 21 00 00 48 8b 84 24 f8 00
RSP: 0018:ffffc900043473d0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000010046 RCX: ffffffff886b1597
RDX: 000000000000000e RSI: ffffffff886b2520 RDI: 0000000000000070
RBP: ffffc90004347578 R08: 0000000000000005 R09: 000000000000ffff
R10: 000000000000ffff R11: 0000000000000002 R12: ffff888063202ac0
R13: 0000000000010000 R14: 000000000000ffff R15: 0000000000000046
FS: 0000555556e7e380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020010000 CR3: 0000000027ee2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Fixes: 3953c46c3a ("sk_buff: allow segmenting based on frag sizes")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20231212164621.4131800-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2024-02-23 09:12:51 +01:00
..
6lowpan
…
9p net: 9p: avoid freeing uninit memory in p9pdu_vreadf 2024-01-01 12:39:04 +00:00
802 mrp: introduce active flags to prevent UAF when applicant uninit 2022-12-31 13:33:02 +01:00
8021q vlan: skip nested type that is not IFLA_VLAN_QOS_MAPPING 2024-01-31 16:17:04 -08:00
appletalk appletalk: Fix Use-After-Free in atalk_ioctl 2023-12-20 17:00:19 +01:00
atm atm: Fix Use-After-Free in do_vcc_ioctl 2023-12-20 17:00:17 +01:00
ax25
…
batman-adv net: vlan: introduce skb_vlan_eth_hdr() 2023-12-20 17:00:16 +01:00
bluetooth Bluetooth: L2CAP: Fix possible multiple reject send 2024-02-05 20:12:53 +00:00
bpf Revert "bpf, test_run: fix &xdp_frame misplacement for LIVE_FRAMES" 2023-03-17 08:50:32 +01:00
bpfilter
…
bridge bridge: mcast: fix disabled snooping after long uptime 2024-02-05 20:13:01 +00:00
caif net: caif: Fix use-after-free in cfusbl_device_notify() 2023-03-17 08:50:24 +01:00
can can: j1939: Fix UAF in j1939_sk_match_filter during setsockopt(SO_J1939_FILTER) 2024-02-23 09:12:47 +01:00
ceph libceph: use kernel_connect() 2023-10-19 23:08:56 +02:00
core net: prevent mss overflow in skb_segment() 2024-02-23 09:12:51 +01:00
dcb net: dcb: choose correct policy to parse DCB_ATTR_BCN 2023-08-11 12:08:17 +02:00
dccp dccp/tcp: Call security_inet_conn_request() after setting IPv6 addresses. 2023-11-20 11:52:16 +01:00
devlink devlink: remove reload failed checks in params get/set callbacks 2023-09-23 11:11:01 +02:00
dns_resolver keys, dns: Fix size check of V1 server-list header 2024-01-25 15:27:38 -08:00
dsa net: dsa: sja1105: always enable the send_meta options 2023-07-19 16:22:06 +02:00
ethernet
…
ethtool ethtool: netlink: Add missing ethnl_ops_begin/complete 2024-01-25 15:27:51 -08:00
hsr net: hsr: remove WARN_ONCE() in send_hsr_supervision_frame() 2024-02-23 09:12:37 +01:00
ieee802154
…
ife net: sched: ife: fix potential use-after-free 2024-01-01 12:38:56 +00:00
ipv4 inet: read sk->sk_family once in inet_recv_error() 2024-02-16 19:06:27 +01:00
ipv6 ipv6: Ensure natural alignment of const ipv6 loopback and router addresses 2024-02-05 20:13:01 +00:00
iucv net/iucv: Fix size of interrupt data 2023-03-22 13:33:50 +01:00
kcm kcm: Fix error handling for SOCK_DGRAM in kcm_sendmsg(). 2023-09-19 12:28:10 +02:00
key net: af_key: fix sadb_x_filter validation 2023-08-23 17:52:32 +02:00
l2tp udp: annotate data-races around udp->encap_type 2024-01-10 17:10:28 +01:00
l3mdev
…
lapb
…
llc llc: call sock_orphan() at release time 2024-02-05 20:13:01 +00:00
mac80211 wifi: mac80211: reload info pointer in ieee80211_tx_dequeue() 2024-02-23 09:12:44 +01:00
mac802154
…
mctp mctp: perform route lookups under a RCU read-side lock 2023-10-19 23:08:57 +02:00
mpls net: mpls: fix stale pointer if allocation fails during device rename 2023-02-22 12:59:53 +01:00
mptcp mptcp: check addrs list in userspace_pm_get_local_id 2024-02-23 09:12:36 +01:00
ncsi net/ncsi: Fix netlink major/minor version numbers 2024-01-25 15:27:24 -08:00
netfilter netfilter: ipset: Missing gc cancellations fixed 2024-02-23 09:12:50 +01:00
netlabel calipso: fix memory leak in netlbl_calipso_add_pass() 2024-01-25 15:27:20 -08:00
netlink netlink: fix potential sleeping issue in mqueue_flush_file 2024-01-31 16:17:05 -08:00
netrom netrom: Deny concurrent connect(). 2023-09-13 09:42:35 +02:00
nfc nfc: nci: free rx_data_reassembly skb on NCI device cleanup 2024-02-23 09:12:37 +01:00
nsh net: nsh: Use correct mac_offset to unwind gso skb in nsh_gso_segment() 2023-05-24 17:32:45 +01:00
openvswitch net: openvswitch: limit the number of recursions from action sets 2024-02-23 09:12:30 +01:00
packet packet: Move reference count in packet_sock to atomic_long_t 2023-12-13 18:39:20 +01:00
phonet
…
psample psample: Require 'CAP_NET_ADMIN' when joining "packets" group 2023-12-13 18:39:11 +01:00
qrtr net: qrtr: ns: Return 0 if server port is not present 2024-01-20 11:50:09 +01:00
rds net/rds: Fix UBSAN: array-index-out-of-bounds in rds_cmsg_recv 2024-01-31 16:17:04 -08:00
rfkill net: rfkill: gpio: set GPIO direction 2024-01-01 12:39:04 +00:00
rose net/rose: fix races in rose_kill_by_device() 2024-01-01 12:38:57 +00:00
rxrpc rxrpc: Fix response to PING RESPONSE ACKs to a dead call 2024-02-16 19:06:27 +01:00
sched net/sched: act_ct: fix skb leak and crash on ooo frags 2024-01-25 15:27:31 -08:00
sctp sctp: fix busy polling 2024-01-25 15:27:30 -08:00
smc net/smc: disable SEID on non-s390 archs where virtual ISM may be used 2024-02-05 20:12:54 +00:00
strparser
…
sunrpc SUNRPC: Fix a suspicious RCU usage warning 2024-02-05 20:12:49 +00:00
switchdev
…
tipc tipc: Check the bearer type before calling tipc_udp_nl_bearer_add() 2024-02-16 19:06:27 +01:00
tls tls: fix NULL deref on tls_sw_splice_eof() with empty record 2024-02-23 09:12:48 +01:00
unix af_unix: Call kfree_skb() for dead unix_(sk)->oob_skb in GC. 2024-02-16 19:06:27 +01:00
vmw_vsock virtio/vsock: fix logic which reduces credit update messages 2024-01-25 15:27:28 -08:00
wireless wifi: cfg80211: fix wiphy delayed work queueing 2024-02-23 09:12:44 +01:00
x25 net/x25: Fix to not accept on connected socket 2023-02-09 11:28:13 +01:00
xdp xsk: Skip polling event check for unbound socket 2023-12-13 18:39:08 +01:00
xfrm xfrm: Silence warnings triggerable by bad packets 2024-02-23 09:12:47 +01:00
Kconfig
…
Kconfig.debug
…
Makefile devlink: move code to a dedicated directory 2023-08-30 16:11:00 +02:00
compat.c use less confusing names for iov_iter direction initializers 2023-02-09 11:28:04 +01:00
devres.c
…
socket.c splice, net: Add a splice_eof op to file-ops and socket-ops 2024-01-10 17:10:27 +01:00
sysctl_net.c
…