==================================================================
BUG: KASAN: slab-out-of-bounds in decode_session6+0xe6d/0x1530 net/xfrm/xfrm_policy.c:3369
Read of size 1 at addr ffff88804afb9359 by task systemd/1
CPU: 0 PID: 1 Comm: systemd Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247
__kasan_report mm/kasan/report.c:433 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:450
decode_session6+0xe6d/0x1530 net/xfrm/xfrm_policy.c:3369
__xfrm_decode_session+0x50/0xb0 net/xfrm/xfrm_policy.c:3456
xfrm_decode_session include/net/xfrm.h:1149 [inline]
xfrmi_xmit+0x16d/0x1770 net/xfrm/xfrm_interface.c:353
__netdev_start_xmit include/linux/netdevice.h:4614 [inline]
netdev_start_xmit include/linux/netdevice.h:4628 [inline]
xmit_one net/core/dev.c:3473 [inline]
dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3489
sch_direct_xmit+0x19f/0xbc0 net/sched/sch_generic.c:342
qdisc_restart net/sched/sch_generic.c:407 [inline]
__qdisc_run+0x4bc/0x1700 net/sched/sch_generic.c:415
__dev_xmit_skb net/core/dev.c:3758 [inline]
__dev_queue_xmit+0x2091/0x3630 net/core/dev.c:4077
neigh_connected_output+0x3b6/0x510 net/core/neighbour.c:1552
neigh_output include/net/neighbour.h:527 [inline]
ip6_finish_output2+0x571/0x14e0 net/ipv6/ip6_output.c:126
__ip6_finish_output net/ipv6/ip6_output.c:191 [inline]
__ip6_finish_output+0x61e/0xe80 net/ipv6/ip6_output.c:170
ip6_finish_output+0x32/0x200 net/ipv6/ip6_output.c:201
NF_HOOK_COND include/linux/netfilter.h:296 [inline]
ip6_output+0x1e4/0x530 net/ipv6/ip6_output.c:224
dst_output include/net/dst.h:450 [inline]
NF_HOOK include/linux/netfilter.h:307 [inline]
ndisc_send_skb+0xa99/0x17f0 net/ipv6/ndisc.c:508
ndisc_send_rs+0x12e/0x6f0 net/ipv6/ndisc.c:702
addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3898
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 6a 01 07 f8 48 89 ef e8 b2 77 07 f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 73 41 fa f7 65 8b 05 ac c5 ac 76 85 c0 74 0a 5b 5d c3 e8 60 31
RSP: 0018:ffffc90000c67df0 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff1b22e09
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff888010db8e48 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817ddbf8 R11: 00000000131b101c R12: ffff888010db8e00
R13: ffff888010dc44c0 R14: 00007fd8569c1590 R15: 0000000000000010
extract_crng drivers/char/random.c:1016 [inline]
extract_crng_user drivers/char/random.c:1072 [inline]
urandom_read_nowarn.constprop.0+0x142/0x680 drivers/char/random.c:1811
__do_sys_getrandom drivers/char/random.c:2008 [inline]
__se_sys_getrandom drivers/char/random.c:1983 [inline]
__x64_sys_getrandom+0x107/0x190 drivers/char/random.c:1983
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fd8551a9469
Code: 00 f3 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 8b 0d ff 49 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007fffa9d2ecd8 EFLAGS: 00000246 ORIG_RAX: 000000000000013e
RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00007fd8551a9469
RDX: 0000000000000001 RSI: 0000000000000010 RDI: 00007fd8569c1590
RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000110 R11: 0000000000000246 R12: 00007fd8569bb140
R13: 00007fd8569c1590 R14: 0000000000000000 R15: 0000000000000019
Allocated by task 8885:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
____kasan_kmalloc mm/kasan/common.c:472 [inline]
__kasan_krealloc+0x11f/0x170 mm/kasan/common.c:581
kasan_krealloc include/linux/kasan.h:289 [inline]
__do_krealloc mm/slab_common.c:1196 [inline]
krealloc+0x54/0xf0 mm/slab_common.c:1233
push_jmp_history kernel/bpf/verifier.c:2267 [inline]
is_state_visited kernel/bpf/verifier.c:11000 [inline]
do_check kernel/bpf/verifier.c:11140 [inline]
do_check_common+0x33c9/0xc8e0 kernel/bpf/verifier.c:13416
do_check_main kernel/bpf/verifier.c:13479 [inline]
bpf_check+0x7389/0xbef0 kernel/bpf/verifier.c:14046
bpf_prog_load+0xf4c/0x21e0 kernel/bpf/syscall.c:2343
__sys_bpf+0x674/0x5980 kernel/bpf/syscall.c:4633
__do_sys_bpf kernel/bpf/syscall.c:4737 [inline]
__se_sys_bpf kernel/bpf/syscall.c:4735 [inline]
__x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4735
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Last potentially related work creation:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
__kasan_record_aux_stack+0xf5/0x120 mm/kasan/generic.c:348
insert_work+0x48/0x370 kernel/workqueue.c:1354
__queue_work+0x5ca/0xee0 kernel/workqueue.c:1520
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1461 [inline]
__run_timers.part.0+0x49f/0xa20 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
The buggy address belongs to the object at ffff88804afb9000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 345 bytes to the right of
512-byte region [ffff88804afb9000, ffff88804afb9200)
The buggy address belongs to the page:
page:ffffea00012bee00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4afb8
head:ffffea00012bee00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010c41c80
raw: 0000000000000000 0000000080100010 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4646, ts 724595572267, free_ts 724016467027
prep_new_page mm/page_alloc.c:2418 [inline]
get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369
alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191
alloc_slab_page mm/slub.c:1793 [inline]
allocate_slab mm/slub.c:1930 [inline]
new_slab+0x32d/0x4a0 mm/slub.c:1993
___slab_alloc+0x918/0xfe0 mm/slub.c:3022
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109
slab_alloc_node mm/slub.c:3200 [inline]
slab_alloc mm/slub.c:3242 [inline]
kmem_cache_alloc_trace+0x289/0x2c0 mm/slub.c:3259
kmalloc include/linux/slab.h:590 [inline]
kzalloc include/linux/slab.h:724 [inline]
alloc_bprm+0x51/0x8f0 fs/exec.c:1503
kernel_execve+0x55/0x460 fs/exec.c:1943
call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:112
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1338 [inline]
free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389
free_unref_page_prepare mm/page_alloc.c:3309 [inline]
free_unref_page+0x19/0x690 mm/page_alloc.c:3388
__unfreeze_partials+0x343/0x360 mm/slub.c:2527
qlink_free mm/kasan/quarantine.c:146 [inline]
qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
__kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:259 [inline]
slab_post_alloc_hook mm/slab.h:519 [inline]
slab_alloc_node mm/slub.c:3234 [inline]
slab_alloc mm/slub.c:3242 [inline]
__kmalloc+0x1e7/0x340 mm/slub.c:4419
kmalloc include/linux/slab.h:595 [inline]
kzalloc include/linux/slab.h:724 [inline]
tomoyo_encode2.part.0+0xe9/0x3a0 security/tomoyo/realpath.c:45
tomoyo_encode2 security/tomoyo/realpath.c:31 [inline]
tomoyo_encode+0x28/0x50 security/tomoyo/realpath.c:80
tomoyo_path_perm+0x368/0x400 security/tomoyo/file.c:831
tomoyo_path_symlink+0x94/0xe0 security/tomoyo/tomoyo.c:199
security_path_symlink+0xdf/0x150 security/security.c:1165
do_symlinkat+0x106/0x2e0 fs/namei.c:4272
__do_sys_symlink fs/namei.c:4299 [inline]
__se_sys_symlink fs/namei.c:4297 [inline]
__x64_sys_symlink+0x75/0x90 fs/namei.c:4297
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Memory state around the buggy address:
ffff88804afb9200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88804afb9280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88804afb9300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88804afb9380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88804afb9400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 24 10 and $0x10,%al
2: e8 6a 01 07 f8 callq 0xf8070171
7: 48 89 ef mov %rbp,%rdi
a: e8 b2 77 07 f8 callq 0xf80777c1
f: 81 e3 00 02 00 00 and $0x200,%ebx
15: 75 25 jne 0x3c
17: 9c pushfq
18: 58 pop %rax
19: f6 c4 02 test $0x2,%ah
1c: 75 2d jne 0x4b
1e: 48 85 db test %rbx,%rbx
21: 74 01 je 0x24
23: fb sti
24: bf 01 00 00 00 mov $0x1,%edi
* 29: e8 73 41 fa f7 callq 0xf7fa41a1 <-- trapping instruction
2e: 65 8b 05 ac c5 ac 76 mov %gs:0x76acc5ac(%rip),%eax # 0x76acc5e1
35: 85 c0 test %eax,%eax
37: 74 0a je 0x43
39: 5b pop %rbx
3a: 5d pop %rbp
3b: c3 retq
3c: e8 .byte 0xe8
3d: 60 (bad)
3e: 31 .byte 0x31