==================================================================
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 ffff8881d85d31c8 by task syz.1.165/871
CPU: 1 PID: 871 Comm: syz.1.165 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:p4d_none arch/x86/include/asm/pgtable.h:906 [inline]
RIP: 0010:p4d_none_or_clear_bad include/asm-generic/pgtable.h:578 [inline]
RIP: 0010:vunmap_p4d_range mm/vmalloc.c:119 [inline]
RIP: 0010:vunmap_page_range+0x10c/0x530 mm/vmalloc.c:136
Code: c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 4c 89 f3 4c 89 34 24 74 0d 48 8b 3c 24 e8 bb 34 05 00 48 8b 1c 24 48 8b 2b <48> 89 ee 48 83 e6 9f 31 ff e8 f6 52 d5 ff 48 89 e8 48 83 e0 9f 0f
RSP: 0018:ffff8881ed78f1e8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff0bc1d92 RBX: ffffffff85e0ec90 RCX: dffffc0000000000
RDX: ffff8881f31c1f80 RSI: ffffc90000054fff RDI: ffffc97fffffffff
RBP: 00000001f5cb8067 R08: ffffffff818eec40 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff8881d9a69248
R13: ffffc90000055000 R14: ffffffff85e0ec90 R15: ffffc90000053000
unmap_vmap_area mm/vmalloc.c:1196 [inline]
free_unmap_vmap_area mm/vmalloc.c:1354 [inline]
remove_vm_area+0x196/0x1c0 mm/vmalloc.c:2164
vm_remove_mappings mm/vmalloc.c:2191 [inline]
__vunmap+0x1bb/0x890 mm/vmalloc.c:2251
bpf_check+0x8a9d/0xb340 kernel/bpf/verifier.c:9729
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
RIP: 0033:0x7f97cc23cd39
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:00007f97cb4be048 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f97cc3cafa0 RCX: 00007f97cc23cd39
RDX: 0000000000000048 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 00007f97cc2bd766 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f97cc3cafa0 R15: 00007ffd81fdb928
Allocated by task 757:
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
getname_flags+0xb8/0x4e0 fs/namei.c:141
do_sys_open+0x357/0x810 fs/open.c:1117
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Freed by task 757:
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
getname_flags+0x23e/0x4e0 fs/namei.c:154
do_sys_open+0x357/0x810 fs/open.c:1117
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
The buggy address belongs to the object at ffff8881d85d2200
which belongs to the cache names_cache of size 4096
The buggy address is located 4040 bytes inside of
4096-byte region [ffff8881d85d2200, ffff8881d85d3200)
The buggy address belongs to the page:
page:ffffea0007617400 refcount:1 mapcount:0 mapping:ffff8881f5d04a00 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5d04a00
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, 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
getname_flags+0xb8/0x4e0 fs/namei.c:141
do_sys_open+0x357/0x810 fs/open.c:1117
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
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:
ffff8881d85d3080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881d85d3100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881d85d3180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881d85d3200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881d85d3280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1d8ea3067 P4D 1d8ea3067 PUD 1d8ea6067 PMD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 875 Comm: syz.4.167 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:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154d7aa RBX: 0000000000000101 RCX: ffff8881f31c3f00
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881d85d31c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff98e8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d85d31c0
FS: 00007fe8513866c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001edbad000 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: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:preempt_schedule_irq+0xc2/0x140 kernel/sched/core.c:4558
Code: 4c 89 e7 e8 90 e1 43 fd f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 4d bf 01 00 00 00 e8 04 a2 f4 fc fb bf 01 00 00 00 b9 e6 ff ff fa bf 01 00 00 00 e8 6e a3 f4 fc 65 48 8b 1d a6 4d
RSP: 0018:ffff8881edba79c0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff1103e63890f RBX: 1ffff1103db74f3c RCX: ffffffff84511c00
RDX: ffffc90001548000 RSI: 0000000000004431 RDI: 0000000000000001
RBP: ffff8881edba7a48 R08: ffffffff82316d59 R09: ffffed103edeb135
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881edba79e0
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff1103db74f38
retint_kernel+0x1b/0x1b
RIP: 0010:__kasan_kmalloc+0x1de/0x210 mm/kasan/common.c:78
Code: 84 c3 75 10 20 d1 75 0c 48 ff c3 48 39 de 75 d1 89 f3 eb 02 ff c3 48 8d 7c 24 20 89 de 44 89 f2 e8 27 35 b4 00 43 89 44 2c 04 <65> 48 8b 04 25 28 00 00 00 48 3b 84 24 20 02 00 00 75 12 4c 89 e0
RSP: 0018:ffff8881edba7b00 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 00000000982000ef RBX: 0000000000000006 RCX: 35d47040f1a8c800
RDX: 0000000000000cc0 RSI: ffff8881edba7b44 RDI: 00000000fbf6a7ad
RBP: ffff8881edba7d60 R08: 0000000000000003 R09: ffffffff846031dc
R10: ffffffff84800000 R11: dffffc0000000000 R12: ffff8881ecedc400
R13: 0000000000001000 R14: 0000000000000cc0 R15: ffff8881edba7b20
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
getname_flags+0xb8/0x4e0 fs/namei.c:141
do_sys_open+0x357/0x810 fs/open.c:1117
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7fe852104d39
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:00007fe851386048 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fe852292fa0 RCX: 00007fe852104d39
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffffffffff
RBP: 00007fe852185766 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fe852292fa0 R15: 00007ffc90e9dd78
Modules linked in:
CR2: 0000000000000000
---[ end trace 9634030ede66862b ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154d7aa RBX: 0000000000000101 RCX: ffff8881f31c3f00
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881d85d31c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff98e8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d85d31c0
FS: 00007fe8513866c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001edbad000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: c1 e8 03 shr $0x3,%eax
3: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
a: fc ff df
d: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1)
11: 4c 89 f3 mov %r14,%rbx
14: 4c 89 34 24 mov %r14,(%rsp)
18: 74 0d je 0x27
1a: 48 8b 3c 24 mov (%rsp),%rdi
1e: e8 bb 34 05 00 call 0x534de
23: 48 8b 1c 24 mov (%rsp),%rbx
27: 48 8b 2b mov (%rbx),%rbp
* 2a: 48 89 ee mov %rbp,%rsi <-- trapping instruction
2d: 48 83 e6 9f and $0xffffffffffffff9f,%rsi
31: 31 ff xor %edi,%edi
33: e8 f6 52 d5 ff call 0xffd5532e
38: 48 89 e8 mov %rbp,%rax
3b: 48 83 e0 9f and $0xffffffffffffff9f,%rax
3f: 0f .byte 0xf