==================================================================
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 ffff8881dcba31c8 by task syz-executor.2/1914
CPU: 1 PID: 1914 Comm: syz-executor.2 Not tainted 5.4.276-syzkaller-04917-g58de09405d1e #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:memset+0x4/0x40 mm/kasan/common.c:105
Code: e8 09 00 00 c3 90 89 f6 48 8b 0c 24 31 d2 e9 93 22 00 00 0f 1f 00 89 f6 48 8b 0c 24 ba 01 00 00 00 e9 80 22 00 00 55 41 56 53 <48> 89 d3 41 89 f6 48 89 fd 48 8b 4c 24 18 48 89 d6 ba 01 00 00 00
RSP: 0018:ffff8881e249f120 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff8881e249f475 RBX: ffff8881e249f478 RCX: 1ffff1103c493e88
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff8881e249f490
RBP: ffff8881e249f430 R08: 0000000000000001 R09: ffff8881e249f490
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffffffff0c37ded
R13: ffffffff861bef68 R14: ffff8881e249f440 R15: dffffc0000000000
unwind_next_frame+0x1036/0x1ea0 arch/x86/kernel/unwind_orc.c:534
arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25
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_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]
__kmalloc_track_caller+0x100/0x2b0 mm/slub.c:4449
kstrdup mm/util.c:60 [inline]
kstrdup_const+0x51/0x90 mm/util.c:82
alloc_vfsmnt+0x97/0x440 fs/namespace.c:186
clone_mnt+0x6c/0xbc0 fs/namespace.c:1023
copy_tree+0x408/0xb50 fs/namespace.c:1802
copy_mnt_ns+0x12c/0x960 fs/namespace.c:3261
create_new_namespaces+0xd6/0x570 kernel/nsproxy.c:71
copy_namespaces+0x169/0x1b0 kernel/nsproxy.c:161
copy_process+0x12da/0x3230 kernel/fork.c:2055
_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
RIP: 0033:0x7fe41070da29
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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe410693078 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fe41081ff80 RCX: 00007fe41070da29
RDX: 0000000000000000 RSI: 0000000000002ae0 RDI: 0000000096020007
RBP: 00007fe4107692d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 000000000000000b R14: 00007fe41081ff80 R15: 00007ffe083a1808
Allocated by task 678:
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 ffff8881dcba3090
which belongs to the cache shmem_inode_cache of size 760
The buggy address is located 312 bytes inside of
760-byte region [ffff8881dcba3090, ffff8881dcba3388)
The buggy address belongs to the page:
page:ffffea000772e800 refcount:1 mapcount:0 mapping:ffff8881f5d06780 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5d06780
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:2921
__tun_chr_ioctl+0x8a9/0x1d00 drivers/net/tun.c:3184
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:
ffff8881dcba3080: fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881dcba3100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881dcba3180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881dcba3200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881dcba3280: 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 1d909f067 P4D 1d909f067 PUD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1914 Comm: syz-executor.2 Tainted: G B 5.4.276-syzkaller-04917-g58de09405d1e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010002
RAX: ffffffff8154d48a RBX: 0000000000000101 RCX: ffff8881ed141f80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881dcba31c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d0ce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa4a0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881dcba31c0
FS: 00007fe4106936c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ec825000 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: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:memset+0x4/0x40 mm/kasan/common.c:105
Code: e8 09 00 00 c3 90 89 f6 48 8b 0c 24 31 d2 e9 93 22 00 00 0f 1f 00 89 f6 48 8b 0c 24 ba 01 00 00 00 e9 80 22 00 00 55 41 56 53 <48> 89 d3 41 89 f6 48 89 fd 48 8b 4c 24 18 48 89 d6 ba 01 00 00 00
RSP: 0018:ffff8881e249f120 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff8881e249f475 RBX: ffff8881e249f478 RCX: 1ffff1103c493e88
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff8881e249f490
RBP: ffff8881e249f430 R08: 0000000000000001 R09: ffff8881e249f490
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffffffff0c37ded
R13: ffffffff861bef68 R14: ffff8881e249f440 R15: dffffc0000000000
unwind_next_frame+0x1036/0x1ea0 arch/x86/kernel/unwind_orc.c:534
arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25
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_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]
__kmalloc_track_caller+0x100/0x2b0 mm/slub.c:4449
kstrdup mm/util.c:60 [inline]
kstrdup_const+0x51/0x90 mm/util.c:82
alloc_vfsmnt+0x97/0x440 fs/namespace.c:186
clone_mnt+0x6c/0xbc0 fs/namespace.c:1023
copy_tree+0x408/0xb50 fs/namespace.c:1802
copy_mnt_ns+0x12c/0x960 fs/namespace.c:3261
create_new_namespaces+0xd6/0x570 kernel/nsproxy.c:71
copy_namespaces+0x169/0x1b0 kernel/nsproxy.c:161
copy_process+0x12da/0x3230 kernel/fork.c:2055
_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
RIP: 0033:0x7fe41070da29
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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe410693078 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fe41081ff80 RCX: 00007fe41070da29
RDX: 0000000000000000 RSI: 0000000000002ae0 RDI: 0000000096020007
RBP: 00007fe4107692d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 000000000000000b R14: 00007fe41081ff80 R15: 00007ffe083a1808
Modules linked in:
CR2: 0000000000000000
---[ end trace a7f47374f730c96b ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010002
RAX: ffffffff8154d48a RBX: 0000000000000101 RCX: ffff8881ed141f80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881dcba31c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d0ce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa4a0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881dcba31c0
FS: 00007fe4106936c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ec825000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 09 00 00 c3 call 0xc300000e
5: 90 nop
6: 89 f6 mov %esi,%esi
8: 48 8b 0c 24 mov (%rsp),%rcx
c: 31 d2 xor %edx,%edx
e: e9 93 22 00 00 jmp 0x22a6
13: 0f 1f 00 nopl (%rax)
16: 89 f6 mov %esi,%esi
18: 48 8b 0c 24 mov (%rsp),%rcx
1c: ba 01 00 00 00 mov $0x1,%edx
21: e9 80 22 00 00 jmp 0x22a6
26: 55 push %rbp
27: 41 56 push %r14
29: 53 push %rbx
* 2a: 48 89 d3 mov %rdx,%rbx <-- trapping instruction
2d: 41 89 f6 mov %esi,%r14d
30: 48 89 fd mov %rdi,%rbp
33: 48 8b 4c 24 18 mov 0x18(%rsp),%rcx
38: 48 89 d6 mov %rdx,%rsi
3b: ba 01 00 00 00 mov $0x1,%edx