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BUG: KASAN: stack-out-of-bounds in csd_lock_record+0xcb/0xe0 kernel/smp.c:118
Read of size 8 at addr ffffc90002dd7530 by task syz-executor.5/9631

CPU: 1 PID: 9631 Comm: syz-executor.5 Not tainted 5.8.0-rc3-next-20200703-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x436 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 csd_lock_record+0xcb/0xe0 kernel/smp.c:118
 flush_smp_call_function_queue+0x285/0x730 kernel/smp.c:391
 __sysvec_call_function_single+0x98/0x490 arch/x86/kernel/smp.c:248
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_call_function_single+0xe0/0x120 arch/x86/kernel/smp.c:243
 asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:604
RIP: 0010:tomoyo_update_domain+0x1ff/0x850 security/tomoyo/domain.c:125
Code: 00 00 48 8b 1b 48 3b 1c 24 0f 84 c6 03 00 00 e8 27 2c 11 fe 4c 8d 73 18 4c 89 f0 4c 89 f2 48 c1 e8 03 83 e2 07 42 0f b6 04 20 <38> d0 7f 08 84 c0 0f 85 3d 05 00 00 44 0f b6 6b 18 bf ff ff ff ff
RSP: 0018:ffffc90001f47328 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880945a6680 RCX: ffffc90013e05000
RDX: 0000000000000000 RSI: ffffffff8362dad9 RDI: 0000000000000000
RBP: ffffc90001f473d8 R08: 0000000000000000 R09: ffffffff8a057627
R10: 0000000000000002 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff8880945a6698 R15: 0000000000000002
 tomoyo_update_path_acl security/tomoyo/file.c:398 [inline]
 tomoyo_write_file+0x4b4/0x730 security/tomoyo/file.c:1022
 tomoyo_write_domain2+0xf6/0x1a0 security/tomoyo/common.c:1152
 tomoyo_add_entry security/tomoyo/common.c:2042 [inline]
 tomoyo_supervisor+0xba6/0xeb0 security/tomoyo/common.c:2103
 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline]
 tomoyo_path_permission security/tomoyo/file.c:587 [inline]
 tomoyo_path_permission+0x25c/0x360 security/tomoyo/file.c:573
 tomoyo_check_open_permission+0x30f/0x380 security/tomoyo/file.c:780
 tomoyo_file_open security/tomoyo/tomoyo.c:313 [inline]
 tomoyo_file_open+0xa3/0xd0 security/tomoyo/tomoyo.c:308
 security_file_open+0x52/0x3f0 security/security.c:1574
 do_dentry_open+0x358/0x11b0 fs/open.c:809
 do_open fs/namei.c:3249 [inline]
 path_openat+0x1bb9/0x2750 fs/namei.c:3366
 do_filp_open+0x17e/0x3c0 fs/namei.c:3393
 do_sys_openat2+0x16f/0x3b0 fs/open.c:1173
 do_sys_open fs/open.c:1189 [inline]
 ksys_open include/linux/syscalls.h:1398 [inline]
 __do_sys_creat fs/open.c:1257 [inline]
 __se_sys_creat fs/open.c:1255 [inline]
 __x64_sys_creat+0xc9/0x120 fs/open.c:1255
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:367
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007fccf8fdac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00000000004dbee0 RCX: 000000000045cb29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200001c0
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000000a1 R14: 00000000004c36b0 R15: 00007fccf8fdb6d4


Memory state around the buggy address:
 ffffc90002dd7400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90002dd7480: 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2 04 f2 00
>ffffc90002dd7500: 00 00 f2 00 00 00 f2 f2 f2 00 00 00 00 00 00 00
                                     ^
 ffffc90002dd7580: 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00
 ffffc90002dd7600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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