==================================================================
BUG: KASAN: use-after-free in hlist_move_list include/linux/list.h:852 [inline]
BUG: KASAN: use-after-free in __collect_expired_timers kernel/time/timer.c:1484 [inline]
BUG: KASAN: use-after-free in collect_expired_timers kernel/time/timer.c:1719 [inline]
BUG: KASAN: use-after-free in __run_timers+0x4e6/0x700 kernel/time/timer.c:1783
Write of size 8 at addr ffff8881ce93b1c8 by task syz-executor.1/4625
CPU: 0 PID: 4625 Comm: syz-executor.1 Not tainted 5.4.210-syzkaller-00013-gdf2b5549c0ec #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1d8/0x241 lib/dump_stack.c:118
print_address_description+0x8c/0x630 mm/kasan/report.c:384
__kasan_report+0xf6/0x130 mm/kasan/report.c:516
kasan_report+0x30/0x60 mm/kasan/common.c:653
hlist_move_list include/linux/list.h:852 [inline]
__collect_expired_timers kernel/time/timer.c:1484 [inline]
collect_expired_timers kernel/time/timer.c:1719 [inline]
__run_timers+0x4e6/0x700 kernel/time/timer.c:1783
run_timer_softirq+0x46/0x80 kernel/time/timer.c:1800
__do_softirq+0x23e/0x643 kernel/softirq.c:292
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1083
do_softirq+0x121/0x160 kernel/softirq.c:337
__local_bh_enable_ip+0x6a/0x70 kernel/softirq.c:189
get_next_corpse net/netfilter/nf_conntrack_core.c:2066 [inline]
nf_ct_iterate_cleanup+0x2e7/0x380 net/netfilter/nf_conntrack_core.c:2089
nf_conntrack_cleanup_net_list+0x79/0x210 net/netfilter/nf_conntrack_core.c:2276
ops_exit_list net/core/net_namespace.c:177 [inline]
setup_net+0x684/0xa70 net/core/net_namespace.c:361
copy_net_ns+0x31a/0x510 net/core/net_namespace.c:479
create_new_namespaces+0x4e3/0x5f0 kernel/nsproxy.c:103
copy_namespaces+0x169/0x1b0 kernel/nsproxy.c:161
copy_process+0x12cd/0x3230 kernel/fork.c:2044
_do_fork+0x196/0x8d0 kernel/fork.c:2391
__do_sys_clone kernel/fork.c:2549 [inline]
__se_sys_clone kernel/fork.c:2530 [inline]
__x64_sys_clone+0x287/0x2f0 kernel/fork.c:2530
do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fe9e86e10d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe9e7454118 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fe9e8800f80 RCX: 00007fe9e86e10d9
RDX: 0000000000000000 RSI: 00002a452cb9d000 RDI: 0000000050000000
RBP: 00007fe9e873cae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffefcfa43ef R14: 00007fe9e7454300 R15: 0000000000022000
The buggy address belongs to the page:
page:ffffea00073a4ec0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 0000000000000000 ffffffff00000101 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 0x146dc0(GFP_USER|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__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+0x194/0x380 mm/page_alloc.c:2171
get_page_from_freelist+0x524/0x560 mm/page_alloc.c:3794
__alloc_pages_nodemask+0x372/0x860 mm/page_alloc.c:4857
__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/0xf0 mm/slab_common.c:1358
__kmalloc_node include/linux/slab.h:422 [inline]
kmalloc_node include/linux/slab.h:599 [inline]
kvmalloc_node+0x7e/0xf0 mm/util.c:596
kvmalloc include/linux/mm.h:759 [inline]
kvzalloc include/linux/mm.h:767 [inline]
alloc_netdev_mqs+0x86/0xc30 net/core/dev.c:9597
tun_set_iff+0x4f9/0x1050 drivers/net/tun.c:2825
__tun_chr_ioctl+0x88e/0x1ee0 drivers/net/tun.c:3160
do_vfs_ioctl+0x744/0x1730 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+0xcb/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
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+0x7fe/0x930 mm/page_alloc.c:1438
free_the_page mm/page_alloc.c:4919 [inline]
__free_pages+0x8f/0x250 mm/page_alloc.c:4925
kfree+0x1ef/0x260 mm/slub.c:4068
device_release+0x70/0x1a0 drivers/base/core.c:1776
kobject_cleanup lib/kobject.c:708 [inline]
kobject_release+0x20c/0x330 lib/kobject.c:739
netdev_run_todo+0xc1b/0xdb0 net/core/dev.c:9456
tun_detach drivers/net/tun.c:760 [inline]
tun_chr_close+0xc0/0xd0 drivers/net/tun.c:3534
__fput+0x261/0x680 fs/file_table.c:281
task_work_run+0x186/0x1b0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x1ba/0x1d0 arch/x86/entry/common.c:163
prepare_exit_to_usermode+0x17c/0x1d0 arch/x86/entry/common.c:194
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Memory state around the buggy address:
ffff8881ce93b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881ce93b100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881ce93b180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff8881ce93b200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881ce93b280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4625 Comm: syz-executor.1 Tainted: G B 5.4.210-syzkaller-00013-gdf2b5549c0ec #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:__hlist_del include/linux/list.h:773 [inline]
RIP: 0010:detach_timer kernel/time/timer.c:824 [inline]
RIP: 0010:expire_timers+0x146/0x400 kernel/time/timer.c:1452
Code: c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 02 f6 3d 00 4d 89 3e 4d 85 ff 74 2a e8 45 91 0f 00 49 83 c7 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 db f5 3d 00 4d 89 37 eb 0b 66 0f
RSP: 0018:ffff8881f6e09d68 EFLAGS: 00010802
RAX: 1bd5a00000000025 RBX: ffff8881ce93b1c0 RCX: ffff8881de24af40
RDX: 0000000080000102 RSI: 0000000000000008 RDI: ffff8881ce93b1c8
RBP: 1ffff11039d27639 R08: ffffffff8155ad61 R09: fffffbfff0d9270d
R10: fffffbfff0d9270d R11: 1ffffffff0d9270c R12: ffff8881ce93b1c8
R13: dffffc0000000000 R14: ffff8881f6e09e80 R15: dead00000000012a
FS: 00007fe9e7454700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe39b27fb8 CR3: 00000001e61a7000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__run_timers+0x5e0/0x700 kernel/time/timer.c:1787
run_timer_softirq+0x46/0x80 kernel/time/timer.c:1800
__do_softirq+0x23e/0x643 kernel/softirq.c:292
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1083
do_softirq+0x121/0x160 kernel/softirq.c:337
__local_bh_enable_ip+0x6a/0x70 kernel/softirq.c:189
get_next_corpse net/netfilter/nf_conntrack_core.c:2066 [inline]
nf_ct_iterate_cleanup+0x2e7/0x380 net/netfilter/nf_conntrack_core.c:2089
nf_conntrack_cleanup_net_list+0x79/0x210 net/netfilter/nf_conntrack_core.c:2276
ops_exit_list net/core/net_namespace.c:177 [inline]
setup_net+0x684/0xa70 net/core/net_namespace.c:361
copy_net_ns+0x31a/0x510 net/core/net_namespace.c:479
create_new_namespaces+0x4e3/0x5f0 kernel/nsproxy.c:103
copy_namespaces+0x169/0x1b0 kernel/nsproxy.c:161
copy_process+0x12cd/0x3230 kernel/fork.c:2044
_do_fork+0x196/0x8d0 kernel/fork.c:2391
__do_sys_clone kernel/fork.c:2549 [inline]
__se_sys_clone kernel/fork.c:2530 [inline]
__x64_sys_clone+0x287/0x2f0 kernel/fork.c:2530
do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fe9e86e10d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe9e7454118 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fe9e8800f80 RCX: 00007fe9e86e10d9
RDX: 0000000000000000 RSI: 00002a452cb9d000 RDI: 0000000050000000
RBP: 00007fe9e873cae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffefcfa43ef R14: 00007fe9e7454300 R15: 0000000000022000
Modules linked in:
---[ end trace 647ad41c27605cc5 ]---
RIP: 0010:__hlist_del include/linux/list.h:773 [inline]
RIP: 0010:detach_timer kernel/time/timer.c:824 [inline]
RIP: 0010:expire_timers+0x146/0x400 kernel/time/timer.c:1452
Code: c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 02 f6 3d 00 4d 89 3e 4d 85 ff 74 2a e8 45 91 0f 00 49 83 c7 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 db f5 3d 00 4d 89 37 eb 0b 66 0f
RSP: 0018:ffff8881f6e09d68 EFLAGS: 00010802
RAX: 1bd5a00000000025 RBX: ffff8881ce93b1c0 RCX: ffff8881de24af40
RDX: 0000000080000102 RSI: 0000000000000008 RDI: ffff8881ce93b1c8
RBP: 1ffff11039d27639 R08: ffffffff8155ad61 R09: fffffbfff0d9270d
R10: fffffbfff0d9270d R11: 1ffffffff0d9270c R12: ffff8881ce93b1c8
R13: dffffc0000000000 R14: ffff8881f6e09e80 R15: dead00000000012a
FS: 00007fe9e7454700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe39b27fb8 CR3: 00000001e61a7000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: c1 e8 03 shr $0x3,%eax
3: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
8: 74 08 je 0x12
a: 4c 89 f7 mov %r14,%rdi
d: e8 02 f6 3d 00 callq 0x3df614
12: 4d 89 3e mov %r15,(%r14)
15: 4d 85 ff test %r15,%r15
18: 74 2a je 0x44
1a: e8 45 91 0f 00 callq 0xf9164
1f: 49 83 c7 08 add $0x8,%r15
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ff mov %r15,%rdi
34: e8 db f5 3d 00 callq 0x3df614
39: 4d 89 37 mov %r14,(%r15)
3c: eb 0b jmp 0x49
3e: 66 data16
3f: 0f .byte 0xf