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Eric Dumazet 2e03a92b24 net: do not allow gso_size to be set to GSO_BY_FRAGS 
[ Upstream commit b616be6b97688f2f2bd7c4a47ab32f27f94fb2a9 ]

One missing check in virtio_net_hdr_to_skb() allowed
syzbot to crash kernels again [1]

Do not allow gso_size to be set to GSO_BY_FRAGS (0xffff),
because this magic value is used by the kernel.

[1]
general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077]
CPU: 0 PID: 5039 Comm: syz-executor401 Not tainted 6.5.0-rc5-next-20230809-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:skb_segment+0x1a52/0x3ef0 net/core/skbuff.c:4500
Code: 00 00 00 e9 ab eb ff ff e8 6b 96 5d f9 48 8b 84 24 00 01 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 ea 21 00 00 48 8b 84 24 00 01
RSP: 0018:ffffc90003d3f1c8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 000000000001fffe RCX: 0000000000000000
RDX: 000000000000000e RSI: ffffffff882a3115 RDI: 0000000000000070
RBP: ffffc90003d3f378 R08: 0000000000000005 R09: 000000000000ffff
R10: 000000000000ffff R11: 5ee4a93e456187d6 R12: 000000000001ffc6
R13: dffffc0000000000 R14: 0000000000000008 R15: 000000000000ffff
FS: 00005555563f2380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020020000 CR3: 000000001626d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
udp6_ufo_fragment+0x9d2/0xd50 net/ipv6/udp_offload.c:109
ipv6_gso_segment+0x5c4/0x17b0 net/ipv6/ip6_offload.c:120
skb_mac_gso_segment+0x292/0x610 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+0x3a5/0xf10 net/core/dev.c:3625
__dev_queue_xmit+0x8f0/0x3d60 net/core/dev.c:4329
dev_queue_xmit include/linux/netdevice.h:3082 [inline]
packet_xmit+0x257/0x380 net/packet/af_packet.c:276
packet_snd net/packet/af_packet.c:3087 [inline]
packet_sendmsg+0x24c7/0x5570 net/packet/af_packet.c:3119
sock_sendmsg_nosec net/socket.c:727 [inline]
sock_sendmsg+0xd9/0x180 net/socket.c:750
____sys_sendmsg+0x6ac/0x940 net/socket.c:2496
___sys_sendmsg+0x135/0x1d0 net/socket.c:2550
__sys_sendmsg+0x117/0x1e0 net/socket.c:2579
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff27cdb34d9

Fixes: 3953c46c3a ("sk_buff: allow segmenting based on frag sizes")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Xin Long <lucien.xin@gmail.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230816142158.1779798-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-08-23 17:52:35 +02:00
..
acpi ACPI: sleep: Avoid breaking S3 wakeup due to might_sleep() 2023-06-28 11:12:22 +02:00
asm-generic word-at-a-time: use the same return type for has_zero regardless of endianness 2023-08-11 12:08:11 +02:00
clocksource clocksource/drivers/timer-ti-dm: Move struct omap_dm_timer fields to driver 2022-09-20 10:49:46 +02:00
crypto crypto: kpp - Add helper to set reqsize 2023-07-19 16:21:42 +02:00
drm drm/dp_mst: Clear MSG_RDY flag before sending new message 2023-07-27 08:50:52 +02:00
dt-bindings dt-bindings: clocks: imx8mp: Add ID for usb suspend clock 2022-12-31 13:33:09 +01:00
keys
kunit kunit: fix kunit_test_init_section_suites(...) 2023-02-09 11:28:08 +01:00
kvm KVM: arm64: vgic-v4: Make the doorbell request robust w.r.t preemption 2023-08-23 17:52:28 +02:00
linux net: do not allow gso_size to be set to GSO_BY_FRAGS 2023-08-23 17:52:35 +02:00
math-emu
media media: v4l2-mem2mem: add lock to protect parameter num_rdy 2023-08-23 17:52:23 +02:00
memory memory: renesas-rpc-if: Split-off private data from struct rpcif 2023-03-11 13:55:17 +01:00
misc
net sock: Fix misuse of sk_under_memory_pressure() 2023-08-23 17:52:35 +02:00
pcmcia
ras
rdma RDMA/cma: Always set static rate to 0 for RoCE 2023-06-21 16:00:59 +02:00
rv
scsi scsi: libsas: Add sas_ata_device_link_abort() 2023-05-11 23:03:20 +09:00
soc net: mscc: ocelot: don't keep PTP configuration of all ports in single structure 2023-07-19 16:22:01 +02:00
sound ASoC: Intel: avs: Account for UID of ACPI device 2023-06-21 16:00:53 +02:00
target scsi: target: Fix multiple LUN_RESET handling 2023-05-11 23:03:19 +09:00
trace tcp: add missing family to tcp_set_ca_state() tracepoint 2023-08-16 18:27:27 +02:00
uapi block: Fix a source code comment in include/uapi/linux/blkzoned.h 2023-08-03 10:24:04 +02:00
ufs scsi: ufs: exynos: Fix DMA alignment for PAGE_SIZE != 4096 2023-03-10 09:33:15 +01:00
vdso
video
xen ACPI: processor: Fix evaluating _PDC method when running as Xen dom0 2023-05-11 23:03:11 +09:00