==================================================================
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 ffff8881ccbff1c8 by task syz.2.602/2288
CPU: 0 PID: 2288 Comm: syz.2.602 Tainted: G W 5.4.276-syzkaller-00020-g4275fce9fe94 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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
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/0x460 arch/x86/kernel/apic/apic.c:1149
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:atomic64_read include/asm-generic/atomic-instrumented.h:836 [inline]
RIP: 0010:atomic_long_read include/asm-generic/atomic-long.h:28 [inline]
RIP: 0010:__mutex_owner kernel/locking/mutex.c:77 [inline]
RIP: 0010:mutex_spin_on_owner+0x235/0x2e0 kernel/locking/mutex.c:568
Code: 00 00 00 e8 3d 47 48 00 48 8b 44 24 28 80 3c 28 00 74 08 48 89 df e8 ca 73 48 00 48 f7 03 01 00 00 00 0f 85 8c 00 00 00 f3 90 <48> 89 df be 08 00 00 00 e8 0e 47 48 00 48 8b 44 24 28 80 3c 28 00
RSP: 0018:ffff8881e9d77910 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff8881f6f00000 RBX: ffffffff861875c0 RCX: ffffffff814ba934
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000010
RBP: dffffc0000000000 R08: dffffc0000000000 R09: ffffed1039f533f1
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881eb223f00
R13: ffffffff861875e0 R14: ffffffff861875d0 R15: dffffc0000000000
mutex_optimistic_spin kernel/locking/mutex.c:685 [inline]
__mutex_lock_common kernel/locking/mutex.c:973 [inline]
__mutex_lock+0x2dc/0x1060 kernel/locking/mutex.c:1114
mutex_lock+0xd6/0x110 kernel/locking/mutex.c:296
ppp_ioctl+0xd7/0x15d0 drivers/net/ppp/ppp_generic.c:598
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: 0033:0x7faa1ec02b99
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:00007faa1de63048 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007faa1ed91078 RCX: 00007faa1ec02b99
RDX: 0000000000000000 RSI: 0000000000004b47 RDI: 000000000000000d
RBP: 00007faa1ec8377e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007faa1ed91078 R15: 00007ffeb2df4168
The buggy address belongs to the page:
page:ffffea000732ffc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 0000000000000000 dead000000000122 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 2, migratetype Unmovable, gfp_mask 0x140dc0(GFP_USER|__GFP_COMP|__GFP_ZERO)
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]
kmalloc_order mm/slab_common.c:1342 [inline]
kmalloc_order_trace+0x2a/0x100 mm/slab_common.c:1358
kmalloc_large include/linux/slab.h:485 [inline]
kmalloc include/linux/slab.h:549 [inline]
kzalloc include/linux/slab.h:690 [inline]
bpf_check+0xf6/0xb340 kernel/bpf/verifier.c:9561
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
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:
ffff8881ccbff080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881ccbff100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881ccbff180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff8881ccbff200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881ccbff280: 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 1e17ca067 P4D 1e17ca067 PUD 1e17c9067 PMD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 2169 Comm: syz.3.561 Tainted: G B W 5.4.276-syzkaller-00020-g4275fce9fe94 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010202
RAX: ffffffff8154d48a RBX: 0000000000000101 RCX: ffff8881ce9e1f80
RDX: 0000000080000101 RSI: 0000000000000000 RDI: ffff8881ccbff1c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154d0ce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffe000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ccbff1c0
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dc687000 CR4: 00000000003406b0
DR0: 0000000020000240 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/0x460 arch/x86/kernel/apic/apic.c:1149
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x4d/0x80 kernel/locking/spinlock.c:191
Code: 74 0c 48 c7 c7 90 3b eb 85 e8 af 01 43 fd 48 83 3d 17 1f 9a 01 00 74 36 48 89 df e8 0d d7 fa fc 66 90 4c 89 34 24 ff 34 24 9d 01 00 00 00 e8 89 c3 f3 fc 65 8b 05 ee 70 b1 7b 85 c0 74 08 48
RSP: 0018:ffff8881e8886da0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: ffff8881e8e20cd8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000246 RDI: ffff8881e8e20cd8
RBP: 0000000000000000 R08: ffffffff844ebc91 R09: ffffed103d1c52ae
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffff8881d2e59940 R14: 0000000000000246 R15: dffffc0000000000
mark_buffer_dirty+0x1f9/0x3b0 fs/buffer.c:1113
__block_commit_write+0x185/0x220 fs/buffer.c:2053
block_write_end fs/buffer.c:2131 [inline]
generic_write_end+0xad/0x2f0 fs/buffer.c:2145
ext4_da_write_end+0x772/0xb90 fs/ext4/inode.c:3271
generic_perform_write+0x3d3/0x560 mm/filemap.c:3461
__generic_file_write_iter+0x224/0x530 mm/filemap.c:3579
ext4_file_write_iter+0x499/0x10e0 fs/ext4/file.c:270
call_write_iter include/linux/fs.h:1989 [inline]
new_sync_write fs/read_write.c:483 [inline]
__vfs_write+0x5d3/0x750 fs/read_write.c:496
__kernel_write+0x10f/0x350 fs/read_write.c:515
dump_emit+0x213/0x350 fs/coredump.c:838
elf_core_dump+0x3e1b/0x4740 fs/binfmt_elf.c:2352
do_coredump+0x20fb/0x2f00 fs/coredump.c:801
get_signal+0xd83/0x1440 kernel/signal.c:2729
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: 0033:0x7f8f7c51be77
Code: 98 1a 00 e8 1b f7 ff ff 48 8d 3d 91 98 1a 00 e8 0f f7 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 53 89 fb 48 83 ec 10 <64> 8b 04 25 94 ff ff ff 85 c0 74 2a 89 fe 31 c0 bf 3c 00 00 00 e8
RSP: 002b:00007f8f7b8ba160 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007f8f7c657b99
RDX: 00007f8f7b8ba180 RSI: 00007f8f7b8ba2b0 RDI: 000000000000000b
RBP: 00007f8f7c6d877e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007f8f7c7e5fa0 R15: 00007ffd23ed9af8
Modules linked in:
CR2: 0000000000000000
---[ end trace 298f4e1288a4ff2c ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010202
RAX: ffffffff8154d48a RBX: 0000000000000101 RCX: ffff8881ce9e1f80
RDX: 0000000080000101 RSI: 0000000000000000 RDI: ffff8881ccbff1c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154d0ce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffe000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ccbff1c0
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dc687000 CR4: 00000000003406b0
DR0: 0000000020000240 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 e8 add %ch,%al
4: 3d 47 48 00 48 cmp $0x48004847,%eax
9: 8b 44 24 28 mov 0x28(%rsp),%eax
d: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1)
11: 74 08 je 0x1b
13: 48 89 df mov %rbx,%rdi
16: e8 ca 73 48 00 call 0x4873e5
1b: 48 f7 03 01 00 00 00 testq $0x1,(%rbx)
22: 0f 85 8c 00 00 00 jne 0xb4
28: f3 90 pause
* 2a: 48 89 df mov %rbx,%rdi <-- trapping instruction
2d: be 08 00 00 00 mov $0x8,%esi
32: e8 0e 47 48 00 call 0x484745
37: 48 8b 44 24 28 mov 0x28(%rsp),%rax
3c: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1)