CVE-2024-26862

In the Linux kernel, the following vulnerability has been resolved: packet:
annotate data-races around ignore_outgoing ignore_outgoing is read
locklessly from dev_queue_xmit_nit() and packet_getsockopt() Add
appropriate READ_ONCE()/WRITE_ONCE() annotations. syzbot reported: BUG:
KCSAN: data-race in dev_queue_xmit_nit / packet_setsockopt write to
0xffff888107804542 of 1 bytes by task 22618 on cpu 0:
packet_setsockopt+0xd83/0xfd0 net/packet/af_packet.c:4003
do_sock_setsockopt net/socket.c:2311 [inline] __sys_setsockopt+0x1d8/0x250
net/socket.c:2334 __do_sys_setsockopt net/socket.c:2343 [inline]
__se_sys_setsockopt net/socket.c:2340 [inline]
__x64_sys_setsockopt+0x66/0x80 net/socket.c:2340 do_syscall_64+0xd3/0x1d0
entry_SYSCALL_64_after_hwframe+0x6d/0x75 read to 0xffff888107804542 of 1
bytes by task 27 on cpu 1: dev_queue_xmit_nit+0x82/0x620
net/core/dev.c:2248 xmit_one net/core/dev.c:3527 [inline]
dev_hard_start_xmit+0xcc/0x3f0 net/core/dev.c:3547
__dev_queue_xmit+0xf24/0x1dd0 net/core/dev.c:4335 dev_queue_xmit
include/linux/netdevice.h:3091 [inline] batadv_send_skb_packet+0x264/0x300
net/batman-adv/send.c:108 batadv_send_broadcast_skb+0x24/0x30
net/batman-adv/send.c:127 batadv_iv_ogm_send_to_if
net/batman-adv/bat_iv_ogm.c:392 [inline] batadv_iv_ogm_emit
net/batman-adv/bat_iv_ogm.c:420 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x3f0/0x4b0
net/batman-adv/bat_iv_ogm.c:1700 process_one_work kernel/workqueue.c:3254
[inline] process_scheduled_works+0x465/0x990 kernel/workqueue.c:3335
worker_thread+0x526/0x730 kernel/workqueue.c:3416 kthread+0x1d1/0x210
kernel/kthread.c:388 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 value changed:
0x00 -> 0x01 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 27
Comm: kworker/u8:1 Tainted: G W 6.8.0-syzkaller-08073-g480e035fc4c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 02/29/2024 Workqueue: bat_events
batadv_iv_send_outstanding_bat_ogm_packet