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BUG: KASAN: use-after-free in dev_map_generic_redirect+0xa8/0x59c kernel/bpf/devmap.c:668
Read of size 8 at addr ffff0000f0bde100 by task kworker/u4:4/519
CPU: 1 PID: 519 Comm: kworker/u4:4 Not tainted 6.1.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: wg-kex-wg2 wg_packet_handshake_send_worker
Call trace:
dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0x174/0x4c0 mm/kasan/report.c:427
kasan_report+0xd4/0x130 mm/kasan/report.c:531
__asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351
dev_map_generic_redirect+0xa8/0x59c kernel/bpf/devmap.c:668
xdp_do_generic_redirect_map net/core/filter.c:4416 [inline]
xdp_do_generic_redirect+0x3ec/0x6e4 net/core/filter.c:4475
do_xdp_generic+0x460/0x634 net/core/dev.c:4988
__netif_receive_skb_core+0x15d4/0x378c net/core/dev.c:5390
__netif_receive_skb_one_core net/core/dev.c:5567 [inline]
__netif_receive_skb+0x114/0x400 net/core/dev.c:5683
process_backlog+0x410/0x784 net/core/dev.c:6011
__napi_poll+0xb4/0x3f0 net/core/dev.c:6578
napi_poll net/core/dev.c:6645 [inline]
net_rx_action+0x5cc/0xd3c net/core/dev.c:6759
handle_softirqs+0x318/0xd58 kernel/softirq.c:578
__do_softirq+0x14/0x20 kernel/softirq.c:612
____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80
call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:893
do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85
do_softirq+0xf8/0x1ac kernel/softirq.c:479
__local_bh_enable_ip+0x298/0x470 kernel/softirq.c:403
__raw_read_unlock_bh include/linux/rwlock_api_smp.h:257 [inline]
_raw_read_unlock_bh+0x48/0x58 kernel/locking/spinlock.c:284
wg_socket_send_skb_to_peer+0x158/0x1a8 drivers/net/wireguard/socket.c:184
wg_socket_send_buffer_to_peer+0xec/0x144 drivers/net/wireguard/socket.c:200
wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
wg_packet_handshake_send_worker+0x1a8/0x2a4 drivers/net/wireguard/send.c:51
process_one_work+0x804/0x1484 kernel/workqueue.c:2292
worker_thread+0x8e4/0xfec kernel/workqueue.c:2439
kthread+0x250/0x2d8 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864
Allocated by task 5569:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:936 [inline]
__kmalloc_node+0xe0/0x1d0 mm/slab_common.c:943
kmalloc_node include/linux/slab.h:589 [inline]
bpf_map_kmalloc_node+0x21c/0x610 kernel/bpf/syscall.c:452
__dev_map_alloc_node+0x70/0x448 kernel/bpf/devmap.c:851
__dev_map_update_elem kernel/bpf/devmap.c:916 [inline]
dev_map_update_elem+0x1a8/0x388 kernel/bpf/devmap.c:935
bpf_map_update_value+0x5e8/0x844 kernel/bpf/syscall.c:226
map_update_elem+0x538/0x6b8 kernel/bpf/syscall.c:1463
__sys_bpf+0x2dc/0x654 kernel/bpf/syscall.c:5005
__do_sys_bpf kernel/bpf/syscall.c:5121 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5119 [inline]
__arm64_sys_bpf+0x80/0x98 kernel/bpf/syscall.c:5119
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Freed by task 1651:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516
____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236
__kasan_slab_free+0x18/0x28 mm/kasan/common.c:244
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook mm/slub.c:1750 [inline]
slab_free mm/slub.c:3661 [inline]
__kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674
kfree+0xcc/0x1b8 mm/slab_common.c:988
dev_map_free+0x4a4/0x5f0 kernel/bpf/devmap.c:238
bpf_map_free_deferred+0xbc/0xd0 kernel/bpf/syscall.c:635
process_one_work+0x804/0x1484 kernel/workqueue.c:2292
worker_thread+0x8e4/0xfec kernel/workqueue.c:2439
kthread+0x250/0x2d8 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864
The buggy address belongs to the object at ffff0000f0bde100
which belongs to the cache kmalloc-cg-128 of size 128
The buggy address is located 0 bytes inside of
128-byte region [ffff0000f0bde100, ffff0000f0bde180)
The buggy address belongs to the physical page:
page:000000006e670db5 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x130bde
memcg:ffff0000c4196d01
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 fffffc00033db6c0 dead000000000004 ffff0000c0002d80
raw: 0000000000000000 0000000000100010 00000001ffffffff ffff0000c4196d01
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff0000f0bde000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
ffff0000f0bde080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000f0bde100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff0000f0bde180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff0000f0bde200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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