==================================================================
BUG: KASAN: use-after-free in bq_enqueue kernel/bpf/cpumap.c:749 [inline]
BUG: KASAN: use-after-free in cpu_map_enqueue+0xb4/0x370 kernel/bpf/cpumap.c:775
Read of size 8 at addr ffff8881108e2e08 by task syz.1.9357/22271
CPU: 0 PID: 22271 Comm: syz.1.9357 Not tainted 6.1.118-syzkaller-00015-g770852bf7d99 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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
bq_enqueue kernel/bpf/cpumap.c:749 [inline]
cpu_map_enqueue+0xb4/0x370 kernel/bpf/cpumap.c:775
__xdp_do_redirect_frame net/core/filter.c:4300 [inline]
xdp_do_redirect+0x5b0/0xc60 net/core/filter.c:4344
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: 0033:0x7f21d29847df
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:00007f21d3854000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f21d2b75fa0 RCX: 00007f21d29847df
RDX: 000000000000005e RSI: 0000000020000cc0 RDI: 00000000000000c8
RBP: 00007f21d2a01b08 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000005e R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f21d2b75fa0 R15: 00007ffd8d2c25e8
Allocated by task 21424:
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]
kmalloc_trace+0x44/0xa0 mm/slab_common.c:1033
kmalloc include/linux/slab.h:557 [inline]
kzalloc include/linux/slab.h:693 [inline]
alloc_fs_context+0x65/0x830 fs/fs_context.c:257
fs_context_for_mount+0x24/0x30 fs/fs_context.c:304
do_new_mount+0x15c/0xb30 fs/namespace.c:3035
path_mount+0x671/0x1070 fs/namespace.c:3386
do_mount fs/namespace.c:3399 [inline]
__do_sys_mount fs/namespace.c:3607 [inline]
__se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3584
__x64_sys_mount+0xbf/0xd0 fs/namespace.c:3584
x64_sys_call+0x49d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
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 21424:
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
put_fs_context+0x672/0x7c0 fs/fs_context.c:499
do_new_mount+0x3af/0xb30 fs/namespace.c:3060
path_mount+0x671/0x1070 fs/namespace.c:3386
do_mount fs/namespace.c:3399 [inline]
__do_sys_mount fs/namespace.c:3607 [inline]
__se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3584
__x64_sys_mount+0xbf/0xd0 fs/namespace.c:3584
x64_sys_call+0x49d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
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
insert_work+0x56/0x310 kernel/workqueue.c:1368
__queue_work+0x9b6/0xd70 kernel/workqueue.c:1527
queue_work_on+0x105/0x170 kernel/workqueue.c:1555
queue_work include/linux/workqueue.h:510 [inline]
schedule_work include/linux/workqueue.h:571 [inline]
__cpu_map_entry_replace kernel/bpf/cpumap.c:558 [inline]
cpu_map_free+0x1e7/0x2c0 kernel/bpf/cpumap.c:641
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
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
__cpu_map_entry_replace kernel/bpf/cpumap.c:556 [inline]
cpu_map_free+0x109/0x2c0 kernel/bpf/cpumap.c:641
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 ffff8881108e2e00
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 8 bytes inside of
192-byte region [ffff8881108e2e00, ffff8881108e2ec0)
The buggy address belongs to the physical page:
page:ffffea0004423880 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1108e2
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004250480 dead000000000003 ffff888100042c00
raw: 0000000000000000 0000000000100010 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 290, tgid 290 (syz-executor), ts 22325120740, free_ts 22317596801
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+0x2f41/0x2fc0 mm/page_alloc.c:4462
__alloc_pages+0x234/0x610 mm/page_alloc.c:5759
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+0x207/0x2a0 mm/slub.c:3462
kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1028
kmalloc include/linux/slab.h:557 [inline]
kzalloc include/linux/slab.h:693 [inline]
____ip_mc_inc_group+0x215/0x8d0 net/ipv4/igmp.c:1452
__ip_mc_inc_group net/ipv4/igmp.c:1487 [inline]
ip_mc_inc_group net/ipv4/igmp.c:1493 [inline]
ip_mc_up+0x10f/0x1e0 net/ipv4/igmp.c:1792
inetdev_event+0xc80/0x1110 net/ipv4/devinet.c:1590
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:455
__dev_notify_flags+0x304/0x610
dev_change_flags+0xf0/0x1a0 net/core/dev.c:8685
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+0xb2/0x5c0 mm/page_alloc.c:3607
free_the_page mm/page_alloc.c:798 [inline]
__free_pages+0x61/0xf0 mm/page_alloc.c:5848
__free_slab+0xce/0x1a0 mm/slub.c:2039
free_slab mm/slub.c:2054 [inline]
discard_slab mm/slub.c:2060 [inline]
__unfreeze_partials+0x165/0x1a0 mm/slub.c:2609
put_cpu_partial+0xa9/0x100 mm/slub.c:2685
__slab_free+0x1c8/0x280 mm/slub.c:3563
do_slab_free mm/slub.c:3640 [inline]
___cache_free+0xc6/0xd0 mm/slub.c:3696
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0xc5/0x140 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:310
kasan_slab_alloc include/linux/kasan.h:202 [inline]
slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:768
slab_alloc_node mm/slub.c:3421 [inline]
__kmem_cache_alloc_node+0x193/0x2a0 mm/slub.c:3462
kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1028
kmalloc include/linux/slab.h:557 [inline]
kzalloc include/linux/slab.h:693 [inline]
ref_tracker_alloc+0x138/0x450 lib/ref_tracker.c:85
__netdev_tracker_alloc include/linux/netdevice.h:4076 [inline]
netdev_hold+0x92/0xe0 include/linux/netdevice.h:4105
Memory state around the buggy address:
ffff8881108e2d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8881108e2d80: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881108e2e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881108e2e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8881108e2f00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
general protection fault, probably for non-canonical address 0xe0e46d2d3edc0a81: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x07238969f6e05408-0x07238969f6e0540f]
CPU: 0 PID: 22271 Comm: syz.1.9357 Tainted: G B 6.1.118-syzkaller-00015-g770852bf7d99 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:bq_enqueue kernel/bpf/cpumap.c:751 [inline]
RIP: 0010:cpu_map_enqueue+0x113/0x370 kernel/bpf/cpumap.c:775
Code: e8 03 42 80 3c 30 00 74 08 48 89 df e8 86 ee 24 00 4c 8b 23 4f 8d 74 3c 58 4d 89 f5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 44 05 00 84 c0 0f 85 a8 01 00 00 4d 01 fc 41 8b 1e bf 08
RSP: 0018:ffffc90000f177a8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffffff8674a890 RCX: 0000000000080000
RDX: ffffc900069f1000 RSI: 00000000000341f0 RDI: 00000000000341f1
RBP: ffffc90000f177e0 R08: ffffffff81980bce R09: fffffbfff0f6e2fd
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6e00000
R13: 00e4712d3edc0a81 R14: 07238969f6e05408 R15: 072400e8000053b0
FS: 00007f21d38546c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3061cff8 CR3: 0000000135eb2000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000097 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
__xdp_do_redirect_frame net/core/filter.c:4300 [inline]
xdp_do_redirect+0x5b0/0xc60 net/core/filter.c:4344
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: 0033:0x7f21d29847df
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:00007f21d3854000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f21d2b75fa0 RCX: 00007f21d29847df
RDX: 000000000000005e RSI: 0000000020000cc0 RDI: 00000000000000c8
RBP: 00007f21d2a01b08 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000005e R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f21d2b75fa0 R15: 00007ffd8d2c25e8
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bq_enqueue kernel/bpf/cpumap.c:751 [inline]
RIP: 0010:cpu_map_enqueue+0x113/0x370 kernel/bpf/cpumap.c:775
Code: e8 03 42 80 3c 30 00 74 08 48 89 df e8 86 ee 24 00 4c 8b 23 4f 8d 74 3c 58 4d 89 f5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 44 05 00 84 c0 0f 85 a8 01 00 00 4d 01 fc 41 8b 1e bf 08
RSP: 0018:ffffc90000f177a8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffffff8674a890 RCX: 0000000000080000
RDX: ffffc900069f1000 RSI: 00000000000341f0 RDI: 00000000000341f1
RBP: ffffc90000f177e0 R08: ffffffff81980bce R09: fffffbfff0f6e2fd
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6e00000
R13: 00e4712d3edc0a81 R14: 07238969f6e05408 R15: 072400e8000053b0
FS: 00007f21d38546c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3061cff8 CR3: 0000000135eb2000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000097 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 03 42 80 3c call 0x3c804208
5: 30 00 xor %al,(%rax)
7: 74 08 je 0x11
9: 48 89 df mov %rbx,%rdi
c: e8 86 ee 24 00 call 0x24ee97
11: 4c 8b 23 mov (%rbx),%r12
14: 4f 8d 74 3c 58 lea 0x58(%r12,%r15,1),%r14
19: 4d 89 f5 mov %r14,%r13
1c: 49 c1 ed 03 shr $0x3,%r13
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 41 0f b6 44 05 00 movzbl 0x0(%r13,%rax,1),%eax <-- trapping instruction
30: 84 c0 test %al,%al
32: 0f 85 a8 01 00 00 jne 0x1e0
38: 4d 01 fc add %r15,%r12
3b: 41 8b 1e mov (%r14),%ebx
3e: bf .byte 0xbf
3f: 08 .byte 0x8