==================================================================
BUG: KASAN: use-after-free in dev_map_enqueue+0x40/0x340 kernel/bpf/devmap.c:532
Read of size 8 at addr ffff888115683700 by task syz.7.9147/21608
CPU: 0 PID: 21608 Comm: syz.7.9147 Not tainted 6.1.129-syzkaller-00054-g3e6e324f5b47 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__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_enqueue+0x40/0x340 kernel/bpf/devmap.c:532
__xdp_do_redirect_frame net/core/filter.c:4319 [inline]
xdp_do_redirect+0x5ed/0xc60 net/core/filter.c:4367
tun_xdp_act+0xdb/0xc00 drivers/net/tun.c:1625
tun_build_skb drivers/net/tun.c:1715 [inline]
tun_get_user+0xb35/0x3a90 drivers/net/tun.c:1818
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: 0033:0x7f72e998bc1f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 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 4c 93 02 00 48
RSP: 002b:00007f72ea7f0000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f72e9ba5fa0 RCX: 00007f72e998bc1f
RDX: 000000000000006a RSI: 0000200000000180 RDI: 00000000000000c8
RBP: 00007f72e9a0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000006a R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f72e9ba5fa0 R15: 00007fffa1ef77c8
Allocated by task 21557:
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:589 [inline]
kvmalloc_node+0x221/0x640 mm/util.c:592
kvmalloc include/linux/slab.h:716 [inline]
kvmalloc_array include/linux/slab.h:734 [inline]
kvcalloc include/linux/slab.h:739 [inline]
bpf_check+0xd90/0x17ed0 kernel/bpf/verifier.c:15532
bpf_prog_load+0x1304/0x1bf0 kernel/bpf/syscall.c:2626
__sys_bpf+0x52c/0x7f0 kernel/bpf/syscall.c:5007
__do_sys_bpf kernel/bpf/syscall.c:5111 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5109 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5109
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 21557:
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:3686 [inline]
__kmem_cache_free+0x21d/0x410 mm/slub.c:3702
kfree+0x7a/0xf0 mm/slab_common.c:990
kvfree+0x35/0x40 mm/util.c:639
bpf_check+0x14933/0x17ed0 kernel/bpf/verifier.c:15576
bpf_prog_load+0x1304/0x1bf0 kernel/bpf/syscall.c:2626
__sys_bpf+0x52c/0x7f0 kernel/bpf/syscall.c:5007
__do_sys_bpf kernel/bpf/syscall.c:5111 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5109 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5109
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
Last potentially related work creation:
kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:486
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
kvfree_call_rcu+0x9f/0x800 kernel/rcu/tree.c:3445
kernfs_unlink_open_file+0x327/0x3d0 fs/kernfs/file.c:635
kernfs_fop_release+0x253/0x310 fs/kernfs/file.c:807
__fput+0x1e5/0x870 fs/file_table.c:320
____fput+0x15/0x20 fs/file_table.c:348
task_work_run+0x24d/0x2e0 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0x94/0xa0 kernel/entry/common.c:177
exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x26/0x130 kernel/entry/common.c:303
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Second to last potentially related work creation:
kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:486
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
__call_rcu_common kernel/rcu/tree.c:2807 [inline]
call_rcu+0xdc/0x10f0 kernel/rcu/tree.c:2926
tnode_free net/ipv4/fib_trie.c:496 [inline]
replace+0x19b/0x4b0 net/ipv4/fib_trie.c:522
inflate net/ipv4/fib_trie.c:624 [inline]
resize+0xbaf/0x1d60 net/ipv4/fib_trie.c:869
replace+0x352/0x4b0 net/ipv4/fib_trie.c:530
inflate net/ipv4/fib_trie.c:624 [inline]
resize+0xbaf/0x1d60 net/ipv4/fib_trie.c:869
trie_rebalance net/ipv4/fib_trie.c:1106 [inline]
fib_insert_node net/ipv4/fib_trie.c:1150 [inline]
fib_insert_alias+0xb20/0x1060 net/ipv4/fib_trie.c:1164
fib_table_insert+0xa01/0x20a0 net/ipv4/fib_trie.c:1378
fib_magic net/ipv4/fib_frontend.c:1104 [inline]
fib_add_ifaddr+0x43f/0x15e0 net/ipv4/fib_frontend.c:1126
fib_inetaddr_event+0x159/0x310 net/ipv4/fib_frontend.c:1440
notifier_call_chain kernel/notifier.c:87 [inline]
blocking_notifier_call_chain+0xbb/0x140 kernel/notifier.c:382
__inet_insert_ifa+0x8fb/0xb10 net/ipv4/devinet.c:569
inet_rtm_newaddr+0x8f7/0x1780 net/ipv4/devinet.c:971
rtnetlink_rcv_msg+0x9a5/0xca0 net/core/rtnetlink.c:6150
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2503
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6168
netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
netlink_unicast+0x906/0xab0 net/netlink/af_netlink.c:1338
netlink_sendmsg+0xa15/0xd30 net/netlink/af_netlink.c:1860
sock_sendmsg_nosec net/socket.c:716 [inline]
__sock_sendmsg net/socket.c:728 [inline]
__sys_sendto+0x480/0x600 net/socket.c:2143
__do_sys_sendto net/socket.c:2155 [inline]
__se_sys_sendto net/socket.c:2151 [inline]
__x64_sys_sendto+0xe5/0x100 net/socket.c:2151
x64_sys_call+0x15c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:45
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
The buggy address belongs to the object at ffff888115683700
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
96-byte region [ffff888115683700, ffff888115683760)
The buggy address belongs to the physical page:
page:ffffea000455a0c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115683
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004a1c280 dead000000000002 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 111, tgid 111 (udevadm), ts 5525361964, free_ts 0
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x213/0x220 mm/page_alloc.c:2637
prep_new_page+0x1b/0x110 mm/page_alloc.c:2644
get_page_from_freelist+0x3a98/0x3b10 mm/page_alloc.c:4539
__alloc_pages+0x234/0x610 mm/page_alloc.c:5837
alloc_slab_page+0x6c/0xf0 include/linux/gfp.h:-1
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+0x207/0x2a0 mm/slub.c:3462
kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1028
kmalloc include/linux/slab.h:563 [inline]
kzalloc include/linux/slab.h:699 [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:3625 [inline]
path_openat+0x2532/0x2d60 fs/namei.c:3782
do_filp_open+0x230/0x480 fs/namei.c:3809
do_sys_openat2+0x151/0x870 fs/open.c:1341
page_owner free stack trace missing
Memory state around the buggy address:
ffff888115683600: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888115683680: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
>ffff888115683700: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff888115683780: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888115683800: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
general protection fault, probably for non-canonical address 0xe0e87c29c00004a1: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x0744014e00002508-0x0744014e0000250f]
CPU: 0 PID: 21608 Comm: syz.7.9147 Tainted: G B 6.1.129-syzkaller-00054-g3e6e324f5b47 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__xdp_enqueue kernel/bpf/devmap.c:481 [inline]
RIP: 0010:dev_map_enqueue+0x91/0x340 kernel/bpf/devmap.c:534
Code: d0 00 00 00 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef e8 5f a0 25 00 bb 20 02 00 00 49 03 5d 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 40 a0 25 00 48 83 3b 00 0f 84 eb
RSP: 0018:ffffc90000dd77a0 EFLAGS: 00010202
RAX: 00e88029c00004a1 RBX: 0744014e0000250a RCX: ffffffff8197a441
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888133130318
RBP: ffffc90000dd77e0 R08: ffffffff8144b443 R09: fffffbfff0f6e8fd
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888133130318 R14: ffff888133130248 R15: ffff888115438000
FS: 00007f72ea7f06c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c275fdc CR3: 000000011fb15000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__xdp_do_redirect_frame net/core/filter.c:4319 [inline]
xdp_do_redirect+0x5ed/0xc60 net/core/filter.c:4367
tun_xdp_act+0xdb/0xc00 drivers/net/tun.c:1625
tun_build_skb drivers/net/tun.c:1715 [inline]
tun_get_user+0xb35/0x3a90 drivers/net/tun.c:1818
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: 0033:0x7f72e998bc1f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 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 4c 93 02 00 48
RSP: 002b:00007f72ea7f0000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f72e9ba5fa0 RCX: 00007f72e998bc1f
RDX: 000000000000006a RSI: 0000200000000180 RDI: 00000000000000c8
RBP: 00007f72e9a0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000006a R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f72e9ba5fa0 R15: 00007fffa1ef77c8
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__xdp_enqueue kernel/bpf/devmap.c:481 [inline]
RIP: 0010:dev_map_enqueue+0x91/0x340 kernel/bpf/devmap.c:534
Code: d0 00 00 00 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef e8 5f a0 25 00 bb 20 02 00 00 49 03 5d 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 40 a0 25 00 48 83 3b 00 0f 84 eb
RSP: 0018:ffffc90000dd77a0 EFLAGS: 00010202
RAX: 00e88029c00004a1 RBX: 0744014e0000250a RCX: ffffffff8197a441
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888133130318
RBP: ffffc90000dd77e0 R08: ffffffff8144b443 R09: fffffbfff0f6e8fd
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888133130318 R14: ffff888133130248 R15: ffff888115438000
FS: 00007f72ea7f06c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c275fdc CR3: 000000011fb15000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: d0 00 rolb (%rax)
2: 00 00 add %al,(%rax)
4: 4c 89 e8 mov %r13,%rax
7: 48 c1 e8 03 shr $0x3,%rax
b: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
10: 74 08 je 0x1a
12: 4c 89 ef mov %r13,%rdi
15: e8 5f a0 25 00 call 0x25a079
1a: bb 20 02 00 00 mov $0x220,%ebx
1f: 49 03 5d 00 add 0x0(%r13),%rbx
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 48 89 df mov %rbx,%rdi
34: e8 40 a0 25 00 call 0x25a079
39: 48 83 3b 00 cmpq $0x0,(%rbx)
3d: 0f .byte 0xf
3e: 84 eb test %ch,%bl