==================================================================
BUG: KASAN: use-after-free in dev_map_generic_redirect+0x9f/0x7d0 kernel/bpf/devmap.c:665
Read of size 8 at addr ffff88812d475880 by task syz.5.666/1911
CPU: 0 PID: 1911 Comm: syz.5.666 Not tainted 6.1.112-syzkaller-00008-g38859a233e31 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0x158/0x4e0 mm/kasan/report.c:427
kasan_report+0x13c/0x170 mm/kasan/report.c:531
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351
dev_map_generic_redirect+0x9f/0x7d0 kernel/bpf/devmap.c:665
xdp_do_generic_redirect_map net/core/filter.c:4390 [inline]
xdp_do_generic_redirect+0x42e/0xb40 net/core/filter.c:4449
do_xdp_generic+0x53e/0x800 net/core/dev.c:4958
__netif_receive_skb_core+0x19ae/0x43d0 net/core/dev.c:5365
__netif_receive_skb_one_core net/core/dev.c:5542 [inline]
__netif_receive_skb+0x11c/0x530 net/core/dev.c:5658
netif_receive_skb_internal net/core/dev.c:5744 [inline]
netif_receive_skb+0xb0/0x480 net/core/dev.c:5803
tun_rx_batched+0x1c0/0x8f0 drivers/net/tun.c:1548
tun_get_user+0x287e/0x3a90 drivers/net/tun.c:1998
tun_chr_write_iter+0x129/0x210 drivers/net/tun.c:2044
call_write_iter include/linux/fs.h:2274 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0xaf6/0xed0 fs/read_write.c:584
ksys_write+0x199/0x2c0 fs/read_write.c:637
__do_sys_write fs/read_write.c:649 [inline]
__se_sys_write fs/read_write.c:646 [inline]
__x64_sys_write+0x7b/0x90 fs/read_write.c:646
x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd29137d1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48
RSP: 002b:00007fd2920bf000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd291535f80 RCX: 00007fd29137d1ff
RDX: 000000000000006a RSI: 0000000020000180 RDI: 00000000000000c8
RBP: 00007fd2913f1616 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000006a R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd291535f80 R15: 00007ffd31c13b48
</TASK>
Allocated by task 1814:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
____kasan_kmalloc mm/kasan/common.c:379 [inline]
__kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:388
kasan_kmalloc include/linux/kasan.h:212 [inline]
__do_kmalloc_node mm/slab_common.c:938 [inline]
__kmalloc_node+0xb4/0x1e0 mm/slab_common.c:945
kmalloc_node include/linux/slab.h:583 [inline]
bpf_map_kmalloc_node+0xd0/0x2c0 kernel/bpf/syscall.c:454
__dev_map_alloc_node+0x5c/0x4e0 kernel/bpf/devmap.c:848
__dev_map_update_elem kernel/bpf/devmap.c:913 [inline]
dev_map_update_elem+0x20e/0x3f0 kernel/bpf/devmap.c:932
bpf_map_update_value+0x23a/0x410 kernel/bpf/syscall.c:228
map_update_elem+0x500/0x680 kernel/bpf/syscall.c:1443
__sys_bpf+0x460/0x7f0 kernel/bpf/syscall.c:4990
__do_sys_bpf kernel/bpf/syscall.c:5106 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5104 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5104
x64_sys_call+0x87f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Freed by task 43:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
____kasan_slab_free+0x131/0x180 mm/kasan/common.c:241
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:249
kasan_slab_free include/linux/kasan.h:178 [inline]
slab_free_hook mm/slub.c:1745 [inline]
slab_free_freelist_hook mm/slub.c:1771 [inline]
slab_free mm/slub.c:3684 [inline]
__kmem_cache_free+0x218/0x3b0 mm/slub.c:3697
kfree+0x7a/0xf0 mm/slab_common.c:990
dev_map_free+0x596/0x6c0 kernel/bpf/devmap.c:238
bpf_map_free_deferred+0xf7/0x1b0 kernel/bpf/syscall.c:637
process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299
worker_thread+0xa60/0x1260 kernel/workqueue.c:2446
kthread+0x26d/0x300 kernel/kthread.c:386
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the object at ffff88812d475880
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
96-byte region [ffff88812d475880, ffff88812d4758e0)
The buggy address belongs to the physical page:
page:ffffea0004b51d40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12d475
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004272980 dead000000000006 ffff888100042900
raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 372, tgid 372 (udevd), ts 43466310185, free_ts 43445702322
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590
prep_new_page+0x1b/0x110 mm/page_alloc.c:2597
get_page_from_freelist+0x2980/0x2a10 mm/page_alloc.c:4439
__alloc_pages+0x234/0x610 mm/page_alloc.c:5728
alloc_slab_page+0x6c/0xf0
allocate_slab mm/slub.c:1962 [inline]
new_slab+0x90/0x3e0 mm/slub.c:2015
___slab_alloc+0x6f9/0xb80 mm/slub.c:3203
__slab_alloc+0x5d/0xa0 mm/slub.c:3302
slab_alloc_node mm/slub.c:3387 [inline]
__kmem_cache_alloc_node+0x1af/0x250 mm/slub.c:3460
kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1028
kmalloc include/linux/slab.h:557 [inline]
kzalloc include/linux/slab.h:693 [inline]
kernfs_get_open_node fs/kernfs/file.c:574 [inline]
kernfs_fop_open+0x70e/0xb10 fs/kernfs/file.c:742
do_dentry_open+0x891/0x1250 fs/open.c:884
vfs_open+0x73/0x80 fs/open.c:1015
do_open fs/namei.c:3627 [inline]
path_openat+0x2532/0x2d60 fs/namei.c:3784
do_filp_open+0x230/0x480 fs/namei.c:3811
do_sys_openat2+0x151/0x870 fs/open.c:1341
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1498 [inline]
free_pcp_prepare mm/page_alloc.c:1572 [inline]
free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3511
free_unref_page_list+0xf1/0x7b0 mm/page_alloc.c:3659
release_pages+0xf7f/0xfe0 mm/swap.c:1063
free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:315
tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:254 [inline]
tlb_flush_mmu mm/mmu_gather.c:261 [inline]
tlb_finish_mmu+0x1e0/0x3f0 mm/mmu_gather.c:361
exit_mmap+0x460/0xbe0 mm/mmap.c:3348
__mmput+0x95/0x310 kernel/fork.c:1298
mmput+0x56/0x170 kernel/fork.c:1321
exit_mm kernel/exit.c:568 [inline]
do_exit+0xb29/0x2b80 kernel/exit.c:864
do_group_exit+0x21a/0x2d0 kernel/exit.c:1027
__do_sys_exit_group kernel/exit.c:1038 [inline]
__se_sys_exit_group kernel/exit.c:1036 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036
x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Memory state around the buggy address:
ffff88812d475780: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff88812d475800: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff88812d475880: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff88812d475900: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
ffff88812d475980: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================