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BUG: KASAN: global-out-of-bounds in memcmp+0xe3/0x160 lib/string.c:861
Read of size 1 at addr ffffffff88000008 by task syz-executor5/17358

CPU: 0 PID: 17358 Comm: syz-executor5 Not tainted 4.19.0-rc8+ #286
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
 print_address_description.cold.8+0x58/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430
 memcmp+0xe3/0x160 lib/string.c:861
 strnstr+0x4b/0x70 lib/string.c:934
 __aa_lookupn_ns+0xc1/0x570 security/apparmor/policy_ns.c:209
 aa_lookupn_ns+0x88/0x1e0 security/apparmor/policy_ns.c:240
 aa_fqlookupn_profile+0x1b9/0x1010 security/apparmor/policy.c:468
ptrace attach of "/root/syz-executor2"[15765] was attempted by "/root/syz-executor2"[17371]
 fqlookupn_profile+0x80/0xc0 security/apparmor/label.c:1844
 aa_label_strn_parse+0xa3a/0x1230 security/apparmor/label.c:1908
 aa_label_parse+0x42/0x50 security/apparmor/label.c:1943
 aa_change_profile+0x513/0x3260 security/apparmor/domain.c:1362
ptrace attach of "/root/syz-executor2"[15765] was attempted by "/root/syz-executor2"[17374]
ptrace attach of "/root/syz-executor1"[15760] was attempted by "/root/syz-executor1"[17375]
 apparmor_setprocattr+0xaa4/0x1150 security/apparmor/lsm.c:658
 security_setprocattr+0x66/0xc0 security/security.c:1298
 proc_pid_attr_write+0x301/0x540 fs/proc/base.c:2569
 __vfs_write+0x119/0x9f0 fs/read_write.c:485
 vfs_write+0x1fc/0x560 fs/read_write.c:549
 ksys_write+0x101/0x260 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
kobject: 'loop2' (000000004b10cd19): kobject_uevent_env
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f0a7ad6dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
kobject: 'loop2' (000000004b10cd19): fill_kobj_path: path = '/devices/virtual/block/loop2'
RDX: 0000000000000009 RSI: 0000000020000280 RDI: 0000000000000003
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0a7ad6e6d4
R13: 00000000004c54ee R14: 00000000004d8e08 R15: 00000000ffffffff

The buggy address belongs to the variable:
 __start_rodata+0x8/0x1000

Memory state around the buggy address:
 ffffffff87ffff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff87ffff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffffff88000000: 00 fa fa fa fa fa fa fa 00 01 fa fa fa fa fa fa
                      ^
 ffffffff88000080: 00 00 00 07 fa fa fa fa 00 04 fa fa fa fa fa fa
 ffffffff88000100: 05 fa fa fa fa fa fa fa 00 00 00 00 05 fa fa fa
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