==================================================================
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 ffff8881e67b31c8 by task syz.5.304/1592
CPU: 1 PID: 1592 Comm: syz.5.304 Not tainted 5.4.290-syzkaller-00017-g6b07fcd94a6a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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
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:539 [inline]
smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:__dev_notify_flags+0x3c6/0x510 net/core/dev.c:8012
Code: 01 48 8b 5c 24 18 75 6a e8 f7 0f e3 fd be 04 00 00 00 48 c7 c7 20 73 76 87 4c 89 fa e8 c3 1c c2 fd 48 c7 44 24 20 0e 36 e0 45 <48> b8 00 00 00 00 00 fc ff df 48 c7 04 18 00 00 00 00 48 c7 44 18
RSP: 0018:ffff8881e1257820 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: 1ffff1103c24af08 RCX: ffff8881d58d2f40
RDX: 0000000000000000 RSI: 00000000ffffffdf RDI: 0000000000000000
RBP: ffff8881e1257940 R08: ffffffff814358a4 R09: ffffed103e97880a
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881e12578b0
R13: 0000000000008080 R14: 1ffff1103e978843 R15: ffff8881e12578a0
dev_change_flags+0xe7/0x190 net/core/dev.c:8034
dev_ifsioc+0x104/0xa60 net/core/dev_ioctl.c:226
dev_ioctl+0x505/0xb40 net/core/dev_ioctl.c:483
sock_do_ioctl+0x295/0x3a0 net/socket.c:1081
sock_ioctl+0x4a4/0x760 net/socket.c:1198
do_vfs_ioctl+0x742/0x1720 fs/ioctl.c:47
ksys_ioctl fs/ioctl.c:742 [inline]
__do_sys_ioctl fs/ioctl.c:749 [inline]
__se_sys_ioctl fs/ioctl.c:747 [inline]
__x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:747
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f341b4f0169
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:00007f3419b5a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f341b708fa0 RCX: 00007f341b4f0169
RDX: 0000400000000800 RSI: 0000000000008914 RDI: 0000000000000007
RBP: 00007f341b5712a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f341b708fa0 R15: 00007ffee829b3d8
The buggy address belongs to the page:
page:ffffea000799ecc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 ffffea0007238ac8 ffffea0007740b08 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x500dc0(GFP_USER|__GFP_ZERO|__GFP_ACCOUNT)
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_pages include/linux/gfp.h:503 [inline]
__alloc_pages_node include/linux/gfp.h:516 [inline]
alloc_pages_node include/linux/gfp.h:530 [inline]
__pte_alloc_one include/asm-generic/pgalloc.h:63 [inline]
pte_alloc_one+0x1b/0xb0 arch/x86/mm/pgtable.c:26
__pte_alloc+0x1d/0x1c0 mm/memory.c:440
copy_pte_range mm/memory.c:830 [inline]
copy_pmd_range mm/memory.c:906 [inline]
copy_pud_range mm/memory.c:940 [inline]
copy_p4d_range mm/memory.c:962 [inline]
copy_page_range+0x1c24/0x26f0 mm/memory.c:1024
dup_mmap kernel/fork.c:608 [inline]
dup_mm kernel/fork.c:1379 [inline]
copy_mm+0xb23/0x10d0 kernel/fork.c:1435
copy_process+0x1291/0x3230 kernel/fork.c:2052
_do_fork+0x197/0x900 kernel/fork.c:2399
__do_sys_clone kernel/fork.c:2557 [inline]
__se_sys_clone kernel/fork.c:2538 [inline]
__x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2538
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
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_pcp_prepare mm/page_alloc.c:1233 [inline]
free_unref_page_prepare+0x297/0x380 mm/page_alloc.c:3085
free_unref_page_list+0x10a/0x590 mm/page_alloc.c:3154
release_pages+0xad8/0xb20 mm/swap.c:842
tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:189 [inline]
tlb_flush_mmu mm/mmu_gather.c:196 [inline]
tlb_finish_mmu+0x177/0x320 mm/mmu_gather.c:277
exit_mmap+0x2dc/0x520 mm/mmap.c:3193
__mmput+0x8e/0x2c0 kernel/fork.c:1101
exit_mm kernel/exit.c:538 [inline]
do_exit+0xc08/0x2bc0 kernel/exit.c:848
do_group_exit+0x138/0x300 kernel/exit.c:984
get_signal+0xdb1/0x1440 kernel/signal.c:2738
do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Memory state around the buggy address:
ffff8881e67b3080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881e67b3100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881e67b3180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff8881e67b3200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881e67b3280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1e7510067 P4D 1e7510067 PUD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1499 Comm: syz.6.281 Tainted: G B 5.4.290-syzkaller-00017-g6b07fcd94a6a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154e8ca RBX: 0000000000000101 RCX: ffff8881e69e4ec0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e67b31c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa180
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e67b31c0
FS: 00007ff5ffca26c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e51c7000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
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:539 [inline]
smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:47 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:175 [inline]
RIP: 0010:unwind_next_frame+0x5ea/0x1ea0 arch/x86/kernel/unwind_orc.c:438
Code: 08 00 00 a9 00 04 00 00 0f 84 1e 12 00 00 e9 41 12 00 00 49 89 d6 49 89 d5 4c 89 f8 4c 29 e8 48 89 c1 48 c1 f9 02 48 c1 e8 3f <48> 01 c8 48 83 e0 fe 49 8d 5c 45 00 48 89 d8 48 c1 e8 03 48 b9 00
RSP: 0018:ffff8881c921eb20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffffffff86ba1d00 RCX: 0000000000000000
RDX: ffffffff8656e3f0 RSI: ffffffff86847888 RDI: ffffffff812fbdbc
RBP: ffff8881c921ee10 R08: 0000000000000001 R09: ffff8881c921ee70
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff818fe9f6
R13: ffffffff8656e3f0 R14: ffffffff8656e3f0 R15: ffffffff8656e3f0
arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
save_stack+0x95/0x880 mm/page_owner.c:122
__reset_page_owner+0x1f/0x100 mm/page_owner.c:149
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1176 [inline]
free_pcp_prepare mm/page_alloc.c:1233 [inline]
free_unref_page_prepare+0x297/0x380 mm/page_alloc.c:3085
free_unref_page_list+0x10a/0x590 mm/page_alloc.c:3154
release_pages+0xad8/0xb20 mm/swap.c:842
__pagevec_release+0xc3/0x150 mm/swap.c:862
pagevec_release include/linux/pagevec.h:88 [inline]
shmem_undo_range+0x8a5/0x1ad0 mm/shmem.c:875
shmem_truncate_range mm/shmem.c:997 [inline]
shmem_evict_inode+0x218/0x9a0 mm/shmem.c:1097
evict+0x4ea/0x960 fs/inode.c:610
__dentry_kill+0x429/0x630 fs/dcache.c:583
dentry_kill+0xb8/0x280 fs/dcache.c:677
dput+0x3c/0x80 fs/dcache.c:864
__fput+0x443/0x680 fs/file_table.c:294
task_work_run+0x140/0x170 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0xcaf/0x2bc0 kernel/exit.c:861
do_group_exit+0x138/0x300 kernel/exit.c:984
get_signal+0xdb1/0x1440 kernel/signal.c:2738
do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
ret_from_intr+0x1c/0x1c
RIP: 0033:0xe6
Code: Bad RIP value.
RSP: 002b:0000400000000198 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007ff601850fa0 RCX: 00007ff601638169
RDX: 0000400000000040 RSI: 0000400000000190 RDI: 0000000000006200
RBP: 00007ff6016b92a0 R08: 0000400000000280 R09: 0000400000000280
R10: 0000400000000240 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff601850fa0 R15: 00007ffdccc3d968
Modules linked in:
CR2: 0000000000000000
---[ end trace 652373d647fb2d23 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154e8ca RBX: 0000000000000101 RCX: ffff8881e69e4ec0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e67b31c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa180
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e67b31c0
FS: 00007ff5ffca26c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e51c7000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: 01 48 8b add %ecx,-0x75(%rax)
3: 5c pop %rsp
4: 24 18 and $0x18,%al
6: 75 6a jne 0x72
8: e8 f7 0f e3 fd call 0xfde31004
d: be 04 00 00 00 mov $0x4,%esi
12: 48 c7 c7 20 73 76 87 mov $0xffffffff87767320,%rdi
19: 4c 89 fa mov %r15,%rdx
1c: e8 c3 1c c2 fd call 0xfdc21ce4
21: 48 c7 44 24 20 0e 36 movq $0x45e0360e,0x20(%rsp)
28: e0 45
* 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction
31: fc ff df
34: 48 c7 04 18 00 00 00 movq $0x0,(%rax,%rbx,1)
3b: 00
3c: 48 rex.W
3d: c7 .byte 0xc7
3e: 44 rex.R
3f: 18 .byte 0x18