kasan: CONFIG_KASAN_INLINE enabled
audit: type=1400 audit(1538956085.837:3864): apparmor="DENIED" operation="change_onexec" info="label not found" error=-2 profile="unconfined" name="&=" pid=2495 comm="syz-executor4"
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 2497 Comm: syz-executor1 Not tainted 4.19.0-rc6+ #175
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:memcmp+0x28/0x160 lib/string.c:856
Code: 00 00 48 85 d2 0f 84 0a 01 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 f9 48 89 e5 48 c1 e9 03 41 54 53 48 89 fb 48 83 ec 18 <0f> b6 04 01 48 89 f9 83 e1 07 38 c8 7f 08 84 c0 0f 85 98 00 00 00
RSP: 0018:ffff8801d38e6f48 EFLAGS: 00010296
RAX: dffffc0000000000 RBX: 1ffff1003a71ce40 RCX: 03fffe20074e39c8
RDX: 0000000000000002 RSI: ffffffff883ba3c0 RDI: 1ffff1003a71ce40
RBP: ffff8801d38e6f70 R08: ffff880181a7a380 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002
R13: ffffffff883ba3c0 R14: 1fff79020e004140 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f5f1ab40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000002031e000 CR3: 00000001d7735000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 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
 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
 apparmor_setprocattr+0xa8b/0x1150 security/apparmor/lsm.c:656
 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]
 __ia32_sys_write+0x71/0xb0 fs/read_write.c:607
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f1eca9
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 0c 24 c3 8b 1c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f5f1a0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000000
RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
kobject: 'loop4' (000000004d47b574): kobject_uevent_env
kobject: 'loop4' (000000004d47b574): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop5' (0000000081dfe54e): kobject_uevent_env
kobject: 'loop5' (0000000081dfe54e): fill_kobj_path: path = '/devices/virtual/block/loop5'
audit: type=1400 audit(1538956086.567:3865): apparmor="DENIED" operation="change_onexec" info="label not found" error=-2 profile="unconfined" name="&=" pid=2517 comm="syz-executor5"
kobject: 'loop2' (000000008c64fa57): kobject_uevent_env
kobject: 'loop2' (000000008c64fa57): fill_kobj_path: path = '/devices/virtual/block/loop2'
---[ end trace 41c7b40e68bc42d6 ]---
kobject: 'loop5' (0000000081dfe54e): kobject_uevent_env
RIP: 0010:memcmp+0x28/0x160 lib/string.c:856
Code: 00 00 48 85 d2 0f 84 0a 01 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 f9 48 89 e5 48 c1 e9 03 41 54 53 48 89 fb 48 83 ec 18 <0f> b6 04 01 48 89 f9 83 e1 07 38 c8 7f 08 84 c0 0f 85 98 00 00 00
kobject: 'loop5' (0000000081dfe54e): fill_kobj_path: path = '/devices/virtual/block/loop5'
RSP: 0018:ffff8801d38e6f48 EFLAGS: 00010296
kobject: 'loop4' (000000004d47b574): kobject_uevent_env
kobject: 'loop4' (000000004d47b574): fill_kobj_path: path = '/devices/virtual/block/loop4'
RAX: dffffc0000000000 RBX: 1ffff1003a71ce40 RCX: 03fffe20074e39c8
kobject: 'loop2' (000000008c64fa57): kobject_uevent_env
kobject: 'loop2' (000000008c64fa57): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop3' (00000000b0519190): kobject_uevent_env
RDX: 0000000000000002 RSI: ffffffff883ba3c0 RDI: 1ffff1003a71ce40
kobject: 'loop3' (00000000b0519190): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop2' (000000008c64fa57): kobject_uevent_env
RBP: ffff8801d38e6f70 R08: ffff880181a7a380 R09: 0000000000000000
kobject: 'loop2' (000000008c64fa57): fill_kobj_path: path = '/devices/virtual/block/loop2'
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002
R13: ffffffff883ba3c0 R14: 1fff79020e004140 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f5f1ab40
kobject: 'loop5' (0000000081dfe54e): kobject_uevent_env
kobject: 'loop5' (0000000081dfe54e): fill_kobj_path: path = '/devices/virtual/block/loop5'
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000001d7735000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400