L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html for details.
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BUG: KMSAN: uninit-value in aa_fqlookupn_profile+0x336/0x730 security/apparmor/policy.c:467
CPU: 1 PID: 8209 Comm: syz-executor0 Not tainted 4.19.0+ #82
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+0x32d/0x480 lib/dump_stack.c:113
bridge0: mtu less than device minimum
 kmsan_report+0x19f/0x300 mm/kmsan/kmsan.c:911
 __msan_warning+0x76/0xd0 mm/kmsan/kmsan_instr.c:415
 aa_fqlookupn_profile+0x336/0x730 security/apparmor/policy.c:467
 fqlookupn_profile security/apparmor/label.c:1841 [inline]
 aa_label_strn_parse+0x17bb/0x1e70 security/apparmor/label.c:1908
 aa_label_parse+0x11f/0x130 security/apparmor/label.c:1943
 aa_change_profile+0x959/0x3da0 security/apparmor/domain.c:1362
 apparmor_setprocattr+0xba4/0x13a0 security/apparmor/lsm.c:651
 security_setprocattr+0x139/0x210 security/security.c:1298
 proc_pid_attr_write+0x407/0x4f0 fs/proc/base.c:2569
 __vfs_write+0x1f4/0xb80 fs/read_write.c:485
 vfs_write+0x4a3/0x8f0 fs/read_write.c:549
 ksys_write fs/read_write.c:598 [inline]
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write+0x17a/0x370 fs/read_write.c:607
 __x64_sys_write+0x4a/0x70 fs/read_write.c:607
 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457569
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:00007f9e19ac4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 00000000000001de RSI: 0000000020000040 RDI: 0000000000000003
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9e19ac56d4
R13: 00000000004c585a R14: 00000000004d9558 R15: 00000000ffffffff

Local variable description: ----ns_name@aa_fqlookupn_profile
Variable was created at:
 aa_fqlookupn_profile+0x79/0x730 security/apparmor/policy.c:460
 fqlookupn_profile security/apparmor/label.c:1841 [inline]
 aa_label_strn_parse+0x17bb/0x1e70 security/apparmor/label.c:1908
binder: 8220:8222 ioctl c018620c 20000040 returned -22
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