==================================================================
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 ffff8881e10fb1c8 by task syz.1.585/2211
CPU: 0 PID: 2211 Comm: syz.1.585 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
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:format_decode+0x1ad/0x1f10 lib/vsprintf.c:2334
Code: 48 ba 00 00 00 00 00 fc ff df 4c 8d a4 24 80 00 00 00 e9 67 03 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b 44 24 28 0f b6 04 10 <84> c0 0f 85 ff 13 00 00 4c 89 64 24 48 4c 89 e3 48 81 e3 00 ff ff
RSP: 0018:ffff8881ebf0f520 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff864853e0 RDI: 0000000000000000
RBP: ffff8881ebf0f610 R08: 0000000000000001 R09: ffffffff844c4104
R10: ffff8881df6faf40 R11: 0000000000000002 R12: 0000000000000000
R13: 1ffff1103d7e1eb4 R14: 1ffff1103d7e1eb0 R15: ffffffff852ea860
vsnprintf+0x152/0x1c70 lib/vsprintf.c:2553
add_uevent_var+0x1c0/0x440 lib/kobject_uevent.c:665
kobject_uevent_env+0x31e/0x710 lib/kobject_uevent.c:542
rx_queue_add_kobject net/core/net-sysfs.c:988 [inline]
net_rx_queue_update_kobjects+0x1c2/0x420 net/core/net-sysfs.c:1010
register_queue_kobjects net/core/net-sysfs.c:1632 [inline]
netdev_register_kobject+0x222/0x310 net/core/net-sysfs.c:1858
register_netdevice+0xbc5/0x12a0 net/core/dev.c:9190
tun_set_iff+0x7f7/0xdc0 drivers/net/tun.c:2917
__tun_chr_ioctl+0x8a9/0x1d00 drivers/net/tun.c:3182
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: 0033:0x7fb8d5ef0d39
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:00007fb8d5172048 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb8d607efa0 RCX: 00007fb8d5ef0d39
RDX: 0000000020000200 RSI: 00000000400454ca RDI: 0000000000000004
RBP: 00007fb8d5f71766 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fb8d607efa0 R15: 00007ffe24e58838
Allocated by task 162:
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 ffff8881e10fb090
which belongs to the cache shmem_inode_cache of size 760
The buggy address is located 312 bytes inside of
760-byte region [ffff8881e10fb090, ffff8881e10fb388)
The buggy address belongs to the page:
page:ffffea0007843e00 refcount:1 mapcount:0 mapping:ffff8881f5d07900 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5d07900
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
device_release+0x6b/0x190 drivers/base/core.c:1776
kobject_cleanup lib/kobject.c:716 [inline]
kobject_release lib/kobject.c:747 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1e6/0x2f0 lib/kobject.c:764
tun_set_iff+0x870/0xdc0 drivers/net/tun.c:2919
__tun_chr_ioctl+0x8a9/0x1d00 drivers/net/tun.c:3182
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
Memory state around the buggy address:
ffff8881e10fb080: fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881e10fb100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881e10fb180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881e10fb200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881e10fb280: 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 1e7382067 P4D 1e7382067 PUD 1f34d7067 PMD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 2211 Comm: syz.1.585 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:ffff8881f6e09d18 EFLAGS: 00010206
RAX: ffffffff8154d7aa RBX: 0000000000000100 RCX: ffff8881df6faf40
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881e10fb1c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffba80
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e10fb1c0
FS: 00007fb8d51726c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d90b4000 CR4: 00000000003406b0
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: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:format_decode+0x1ad/0x1f10 lib/vsprintf.c:2334
Code: 48 ba 00 00 00 00 00 fc ff df 4c 8d a4 24 80 00 00 00 e9 67 03 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b 44 24 28 0f b6 04 10 <84> c0 0f 85 ff 13 00 00 4c 89 64 24 48 4c 89 e3 48 81 e3 00 ff ff
RSP: 0018:ffff8881ebf0f520 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff864853e0 RDI: 0000000000000000
RBP: ffff8881ebf0f610 R08: 0000000000000001 R09: ffffffff844c4104
R10: ffff8881df6faf40 R11: 0000000000000002 R12: 0000000000000000
R13: 1ffff1103d7e1eb4 R14: 1ffff1103d7e1eb0 R15: ffffffff852ea860
vsnprintf+0x152/0x1c70 lib/vsprintf.c:2553
add_uevent_var+0x1c0/0x440 lib/kobject_uevent.c:665
kobject_uevent_env+0x31e/0x710 lib/kobject_uevent.c:542
rx_queue_add_kobject net/core/net-sysfs.c:988 [inline]
net_rx_queue_update_kobjects+0x1c2/0x420 net/core/net-sysfs.c:1010
register_queue_kobjects net/core/net-sysfs.c:1632 [inline]
netdev_register_kobject+0x222/0x310 net/core/net-sysfs.c:1858
register_netdevice+0xbc5/0x12a0 net/core/dev.c:9190
tun_set_iff+0x7f7/0xdc0 drivers/net/tun.c:2917
__tun_chr_ioctl+0x8a9/0x1d00 drivers/net/tun.c:3182
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: 0033:0x7fb8d5ef0d39
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:00007fb8d5172048 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb8d607efa0 RCX: 00007fb8d5ef0d39
RDX: 0000000020000200 RSI: 00000000400454ca RDI: 0000000000000004
RBP: 00007fb8d5f71766 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fb8d607efa0 R15: 00007ffe24e58838
Modules linked in:
CR2: 0000000000000000
---[ end trace bcd4b025a034612f ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010206
RAX: ffffffff8154d7aa RBX: 0000000000000100 RCX: ffff8881df6faf40
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881e10fb1c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffba80
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e10fb1c0
FS: 00007fb8d51726c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d90b4000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
7: fc ff df
a: 4c 8d a4 24 80 00 00 lea 0x80(%rsp),%r12
11: 00
12: e9 67 03 00 00 jmp 0x37e
17: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
1e: fc ff df
21: 48 8b 44 24 28 mov 0x28(%rsp),%rax
26: 0f b6 04 10 movzbl (%rax,%rdx,1),%eax
* 2a: 84 c0 test %al,%al <-- trapping instruction
2c: 0f 85 ff 13 00 00 jne 0x1431
32: 4c 89 64 24 48 mov %r12,0x48(%rsp)
37: 4c 89 e3 mov %r12,%rbx
3a: 48 rex.W
3b: 81 .byte 0x81
3c: e3 00 jrcxz 0x3e
3e: ff (bad)
3f: ff .byte 0xff