==================================================================
BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:814 [inline]
BUG: KASAN: use-after-free in enqueue_timer+0xb7/0x300 kernel/time/timer.c:541
Write of size 8 at addr ffff8881eaa671c8 by task syz.2.928/3028
CPU: 1 PID: 3028 Comm: syz.2.928 Not tainted 5.4.274-syzkaller-00002-g6f97bd951d82 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1d8/0x241 lib/dump_stack.c:118
print_address_description+0x8c/0x600 mm/kasan/report.c:384
__kasan_report+0xf3/0x120 mm/kasan/report.c:516
kasan_report+0x30/0x60 mm/kasan/common.c:653
hlist_add_head include/linux/list.h:814 [inline]
enqueue_timer+0xb7/0x300 kernel/time/timer.c:541
__internal_add_timer kernel/time/timer.c:554 [inline]
internal_add_timer+0x240/0x430 kernel/time/timer.c:604
__mod_timer+0x6f1/0x13e0 kernel/time/timer.c:1065
br_hello_timer_expired+0x115/0x170 net/bridge/br_stp_timer.c:40
call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
expire_timers kernel/time/timer.c:1493 [inline]
__run_timers+0x879/0xbe0 kernel/time/timer.c:1817
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
__do_softirq+0x23b/0x6b7 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x195/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:538 [inline]
smp_apic_timer_interrupt+0x11a/0x460 arch/x86/kernel/apic/apic.c:1149
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:207 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp4+0x4/0x70 kernel/kcov.c:248
Code: 77 cf 89 f8 89 f6 48 c7 44 0a 08 02 00 00 00 48 89 44 0a 10 48 89 74 0a 18 4c 89 44 0a 20 49 ff c1 4c 89 09 c3 90 4c 8b 04 24 <65> 48 8b 05 24 50 9e 7e 65 8b 0d 29 50 9e 7e f7 c1 00 01 1f 00 74
RSP: 0018:ffff8881cf6ced40 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff8881cf6cee88 RBX: 0000000000000002 RCX: 0000000000040000
RDX: ffffc9000033f000 RSI: 0000000000000040 RDI: 0000000000000002
RBP: 0000000000000040 R08: ffffffff8153b472 R09: ffff8881cf6cedf0
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11039ed9dd1
R13: 0000000000000001 R14: dffffc0000000000 R15: 1ffff11039ed9dd2
stack_trace_consume_entry+0x162/0x240 kernel/stacktrace.c:94
arch_stack_walk+0x105/0x140 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
kasan_set_free_info mm/kasan/common.c:345 [inline]
__kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487
slab_free_hook mm/slub.c:1455 [inline]
slab_free_freelist_hook mm/slub.c:1494 [inline]
slab_free mm/slub.c:3080 [inline]
kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096
merge_or_add_vmap_area mm/vmalloc.c:727 [inline]
__purge_vmap_area_lazy+0x529/0x1610 mm/vmalloc.c:1290
_vm_unmap_aliases+0x2dd/0x370 mm/vmalloc.c:1707
change_page_attr_set_clr+0x304/0x1090 arch/x86/mm/pageattr.c:1713
change_page_attr_clear arch/x86/mm/pageattr.c:1770 [inline]
set_memory_ro+0xa1/0xe0 arch/x86/mm/pageattr.c:1903
bpf_jit_binary_lock_ro include/linux/filter.h:863 [inline]
bpf_int_jit_compile+0x877b/0x8c40 arch/x86/net/bpf_jit_comp.c:1195
bpf_prog_select_runtime+0x654/0x900 kernel/bpf/core.c:1782
bpf_prog_load kernel/bpf/syscall.c:1728 [inline]
__do_sys_bpf kernel/bpf/syscall.c:2891 [inline]
__se_sys_bpf+0x8193/0xbcb0 kernel/bpf/syscall.c:2849
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f50304a6ae9
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:00007f502f728048 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f5030634fa0 RCX: 00007f50304a6ae9
RDX: 0000000000000080 RSI: 0000000020000200 RDI: 0000000000000005
RBP: 00007f5030527746 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f5030634fa0 R15: 00007ffdca10b2b8
Allocated by task 350:
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
__kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
slab_post_alloc_hook mm/slab.h:584 [inline]
slab_alloc_node mm/slub.c:2829 [inline]
slab_alloc mm/slub.c:2837 [inline]
kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842
shmem_alloc_inode+0x16/0x30 mm/shmem.c:3719
alloc_inode fs/inode.c:231 [inline]
new_inode_pseudo+0x60/0x210 fs/inode.c:927
new_inode+0x25/0x1d0 fs/inode.c:956
shmem_get_inode+0x10b/0x620 mm/shmem.c:2252
shmem_mknod+0x54/0x1a0 mm/shmem.c:2844
lookup_open fs/namei.c:3379 [inline]
do_last fs/namei.c:3471 [inline]
path_openat+0x184a/0x34b0 fs/namei.c:3683
do_filp_open+0x20b/0x450 fs/namei.c:3713
do_sys_open+0x39c/0x810 fs/open.c:1123
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Freed by task 17:
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
kasan_set_free_info mm/kasan/common.c:345 [inline]
__kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487
slab_free_hook mm/slub.c:1455 [inline]
slab_free_freelist_hook mm/slub.c:1494 [inline]
slab_free mm/slub.c:3080 [inline]
kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096
__rcu_reclaim kernel/rcu/rcu.h:222 [inline]
rcu_do_batch+0x492/0xa00 kernel/rcu/tree.c:2167
rcu_core+0x4c8/0xcb0 kernel/rcu/tree.c:2387
__do_softirq+0x23b/0x6b7 kernel/softirq.c:292
The buggy address belongs to the object at ffff8881eaa67090
which belongs to the cache shmem_inode_cache of size 760
The buggy address is located 312 bytes inside of
760-byte region [ffff8881eaa67090, ffff8881eaa67388)
The buggy address belongs to the page:
page:ffffea0007aa9900 refcount:1 mapcount:0 mapping:ffff8881f5d07400 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5d07400
raw: 0000000000000000 0000000000120012 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL)
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook mm/page_alloc.c:2165 [inline]
prep_new_page+0x18f/0x370 mm/page_alloc.c:2171
get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
__alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893
alloc_slab_page+0x39/0x3c0 mm/slub.c:343
allocate_slab mm/slub.c:1683 [inline]
new_slab+0x97/0x440 mm/slub.c:1749
new_slab_objects mm/slub.c:2505 [inline]
___slab_alloc+0x2fe/0x490 mm/slub.c:2667
__slab_alloc+0x62/0xa0 mm/slub.c:2707
slab_alloc_node mm/slub.c:2792 [inline]
slab_alloc mm/slub.c:2837 [inline]
kmem_cache_alloc+0x109/0x250 mm/slub.c:2842
shmem_alloc_inode+0x16/0x30 mm/shmem.c:3719
alloc_inode fs/inode.c:231 [inline]
new_inode_pseudo+0x60/0x210 fs/inode.c:927
new_inode+0x25/0x1d0 fs/inode.c:956
shmem_get_inode+0x10b/0x620 mm/shmem.c:2252
shmem_mknod+0x54/0x1a0 mm/shmem.c:2844
lookup_open fs/namei.c:3379 [inline]
do_last fs/namei.c:3471 [inline]
path_openat+0x184a/0x34b0 fs/namei.c:3683
do_filp_open+0x20b/0x450 fs/namei.c:3713
do_sys_open+0x39c/0x810 fs/open.c:1123
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1176 [inline]
__free_pages_ok+0x847/0x950 mm/page_alloc.c:1438
free_the_page mm/page_alloc.c:4955 [inline]
__free_pages+0x91/0x140 mm/page_alloc.c:4961
bpf_check+0x8aaa/0xb340 kernel/bpf/verifier.c:9731
bpf_prog_load kernel/bpf/syscall.c:1724 [inline]
__do_sys_bpf kernel/bpf/syscall.c:2891 [inline]
__se_sys_bpf+0x8139/0xbcb0 kernel/bpf/syscall.c:2849
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Memory state around the buggy address:
ffff8881eaa67080: fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881eaa67100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881eaa67180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881eaa67200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881eaa67280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 0 Comm: swapper/1 Tainted: G B 5.4.274-syzkaller-00002-g6f97bd951d82 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010002
RAX: ffffffff8154d7aa RBX: 0000000000000101 RCX: ffff8881f5dc8fc0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881eaa671c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa0b8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881eaa671c0
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e03b3000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
expire_timers kernel/time/timer.c:1488 [inline]
__run_timers+0x8a5/0xbe0 kernel/time/timer.c:1817
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
__do_softirq+0x23b/0x6b7 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x195/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:538 [inline]
smp_apic_timer_interrupt+0x11a/0x460 arch/x86/kernel/apic/apic.c:1149
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:default_idle+0x1f/0x30 arch/x86/kernel/process.c:573
Code: 90 90 90 90 90 90 90 90 90 90 90 e8 9b 73 e0 fd bf 01 00 00 00 89 c6 e8 4f ba d7 fc 0f 1f 44 00 00 0f 00 2d d3 c6 53 00 fb f4 7c 73 e0 fd bf ff ff ff ff 89 c6 e9 30 ba d7 fc 41 57 41 56 53
RSP: 0018:ffff8881f5dffd78 EFLAGS: 000002d2 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffff8881f5dc8fc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff8881f5dffe80 R08: ffffffff82316ca1 R09: ffffed103ebb91f9
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff864b6be8
R13: ffff8881f5dc8fc0 R14: 1ffff1103ebb91f8 R15: 0000000000000001
default_idle_call kernel/sched/idle.c:94 [inline]
cpuidle_idle_call kernel/sched/idle.c:154 [inline]
do_idle+0x248/0x660 kernel/sched/idle.c:264
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:356
start_secondary+0x3a5/0x460 arch/x86/kernel/smpboot.c:277
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241
Modules linked in:
CR2: 0000000000000000
---[ end trace 7a0588fa663b0e4e ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010002
RAX: ffffffff8154d7aa RBX: 0000000000000101 RCX: ffff8881f5dc8fc0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881eaa671c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa0b8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881eaa671c0
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e03b3000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 77 cf ja 0xffffffd1
2: 89 f8 mov %edi,%eax
4: 89 f6 mov %esi,%esi
6: 48 c7 44 0a 08 02 00 movq $0x2,0x8(%rdx,%rcx,1)
d: 00 00
f: 48 89 44 0a 10 mov %rax,0x10(%rdx,%rcx,1)
14: 48 89 74 0a 18 mov %rsi,0x18(%rdx,%rcx,1)
19: 4c 89 44 0a 20 mov %r8,0x20(%rdx,%rcx,1)
1e: 49 ff c1 inc %r9
21: 4c 89 09 mov %r9,(%rcx)
24: c3 ret
25: 90 nop
26: 4c 8b 04 24 mov (%rsp),%r8
* 2a: 65 48 8b 05 24 50 9e mov %gs:0x7e9e5024(%rip),%rax # 0x7e9e5056 <-- trapping instruction
31: 7e
32: 65 8b 0d 29 50 9e 7e mov %gs:0x7e9e5029(%rip),%ecx # 0x7e9e5062
39: f7 c1 00 01 1f 00 test $0x1f0100,%ecx
3f: 74 .byte 0x74