==================================================================
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 ffff8881127a7908 by task syz.6.260/1397
CPU: 1 PID: 1397 Comm: syz.6.260 Not tainted 6.1.129-syzkaller-00055-gca24c52e3c25 #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
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:4323 [inline]
xdp_do_redirect_frame+0x275/0x800 net/core/filter.c:4381
xdp_test_run_batch net/bpf/test_run.c:314 [inline]
bpf_test_run_xdp_live+0xc30/0x1f70 net/bpf/test_run.c:362
bpf_prog_test_run_xdp+0x7d1/0x1130 net/bpf/test_run.c:1393
bpf_prog_test_run+0x3b0/0x630 kernel/bpf/syscall.c:3670
__sys_bpf+0x59f/0x7f0 kernel/bpf/syscall.c:5025
__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
RIP: 0033:0x7f0facf8d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0fadde4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f0fad1a5fa0 RCX: 00007f0facf8d169
RDX: 0000000000000050 RSI: 00002000000000c0 RDI: 000000000000000a
RBP: 00007f0fad00e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f0fad1a5fa0 R15: 00007ffc5c2f2b08
Allocated by task 927:
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]
bpf_map_kmalloc_node+0xd0/0x2c0 kernel/bpf/syscall.c:454
__cpu_map_entry_alloc kernel/bpf/cpumap.c:445 [inline]
cpu_map_update_elem+0x28f/0xf50 kernel/bpf/cpumap.c:603
bpf_map_update_value+0x1a3/0x410 kernel/bpf/syscall.c:190
map_update_elem+0x500/0x680 kernel/bpf/syscall.c:1443
__sys_bpf+0x460/0x7f0 kernel/bpf/syscall.c:4995
__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 930:
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_cpu_map_entry+0x6e2/0x760 kernel/bpf/cpumap.c:161
cpu_map_kthread_run+0x2463/0x2520 kernel/bpf/cpumap.c:408
kthread+0x26d/0x300 kernel/kthread.c:386
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
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 ffff8881127a7900
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 8 bytes inside of
192-byte region [ffff8881127a7900, ffff8881127a79c0)
The buggy address belongs to the physical page:
page:ffffea000449e9c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1127a7
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 dead000000000122 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 919, tgid 917 (syz.5.137), ts 79529677716, free_ts 79507470639
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]
push_stack+0x8e/0x4f0 kernel/bpf/verifier.c:1227
check_cond_jmp_op kernel/bpf/verifier.c:10487 [inline]
do_check+0x9369/0xe040 kernel/bpf/verifier.c:12726
do_check_common+0x6ca/0xca0 kernel/bpf/verifier.c:14930
do_check_main kernel/bpf/verifier.c:14993 [inline]
bpf_check+0x6d12/0x17ed0 kernel/bpf/verifier.c:15570
bpf_prog_load+0x1304/0x1bf0 kernel/bpf/syscall.c:2626
__sys_bpf+0x52c/0x7f0 kernel/bpf/syscall.c:5007
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1545 [inline]
free_pcp_prepare mm/page_alloc.c:1619 [inline]
free_unref_page_prepare+0x9f1/0xa00 mm/page_alloc.c:3581
free_unref_page+0xb2/0x5c0 mm/page_alloc.c:3677
free_the_page mm/page_alloc.c:830 [inline]
__free_pages+0x61/0xf0 mm/page_alloc.c:5926
__vunmap+0x9c6/0xb80 mm/vmalloc.c:2729
__vfree mm/vmalloc.c:2778 [inline]
vfree+0x5c/0x80 mm/vmalloc.c:2809
kvfree+0x26/0x40 mm/util.c:637
bpf_map_area_free+0x15/0x20 kernel/bpf/syscall.c:351
dev_map_free+0x64a/0x6c0 kernel/bpf/devmap.c:-1
map_create+0x963/0xcf0 kernel/bpf/syscall.c:1208
__sys_bpf+0x2e6/0x7f0 kernel/bpf/syscall.c:4989
__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
Memory state around the buggy address:
ffff8881127a7800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881127a7880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8881127a7900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881127a7980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8881127a7a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
general protection fault, probably for non-canonical address 0xe0accd43bede007f: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x05668a1df6f003f8-0x05668a1df6f003ff]
CPU: 1 PID: 1397 Comm: syz.6.260 Tainted: G B 6.1.129-syzkaller-00055-gca24c52e3c25 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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 c6 1c 25 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:ffffc90001367600 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffffff8674f998 RCX: 0000000000080000
RDX: ffffc9000e791000 RSI: 0000000000030df3 RDI: 0000000000030df4
RBP: ffffc90001367638 R08: ffffffff819827ae R09: fffffbfff0f6e8fd
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6f00000
R13: 00acd143bede007f R14: 05668a1df6f003fa R15: 0567019c000003a2
FS: 00007f0fadde46c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f10d9bfef98 CR3: 000000012f818000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
__xdp_do_redirect_frame net/core/filter.c:4323 [inline]
xdp_do_redirect_frame+0x275/0x800 net/core/filter.c:4381
xdp_test_run_batch net/bpf/test_run.c:314 [inline]
bpf_test_run_xdp_live+0xc30/0x1f70 net/bpf/test_run.c:362
bpf_prog_test_run_xdp+0x7d1/0x1130 net/bpf/test_run.c:1393
bpf_prog_test_run+0x3b0/0x630 kernel/bpf/syscall.c:3670
__sys_bpf+0x59f/0x7f0 kernel/bpf/syscall.c:5025
__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
RIP: 0033:0x7f0facf8d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0fadde4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f0fad1a5fa0 RCX: 00007f0facf8d169
RDX: 0000000000000050 RSI: 00002000000000c0 RDI: 000000000000000a
RBP: 00007f0fad00e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f0fad1a5fa0 R15: 00007ffc5c2f2b08
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 c6 1c 25 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:ffffc90001367600 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffffff8674f998 RCX: 0000000000080000
RDX: ffffc9000e791000 RSI: 0000000000030df3 RDI: 0000000000030df4
RBP: ffffc90001367638 R08: ffffffff819827ae R09: fffffbfff0f6e8fd
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6f00000
R13: 00acd143bede007f R14: 05668a1df6f003fa R15: 0567019c000003a2
FS: 00007f0fadde46c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f10d9bfef98 CR3: 000000012f818000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
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 c6 1c 25 00 call 0x251cd7
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