syzbot


WARNING in apparmor_cred_free

Status: fixed on 2019/03/06 07:43
Subsystems: apparmor
[Documentation on labels]
Reported-by: syzbot+69ca07954461f189e808@syzkaller.appspotmail.com
Fix commit: a5795fd38ee8 LSM: Check for NULL cred-security on free
First crash: 1904d, last: 1897d
Discussions (6)
Title Replies (including bot) Last reply
[PATCH 4.19 00/99] 4.19.17-stable review 109 (109) 2019/04/22 19:40
[PATCH 4.4 000/104] 4.4.172-stable review 111 (111) 2019/01/30 07:30
[PATCH 4.14 00/59] 4.14.95-stable review 65 (65) 2019/01/23 12:55
[PATCH 4.9 00/51] 4.9.152-stable review 56 (56) 2019/01/23 09:06
[PATCH 4.20 000/111] 4.20.4-stable review 120 (120) 2019/01/23 06:43
WARNING in apparmor_cred_free 9 (10) 2019/01/16 23:44

Sample crash report:
------------[ cut here ]------------
AppArmor WARN cred_label: ((!blob)): 
WARNING: CPU: 0 PID: 0 at security/apparmor/include/cred.h:30 cred_label security/apparmor/include/cred.h:30 [inline]
WARNING: CPU: 0 PID: 0 at security/apparmor/include/cred.h:30 apparmor_cred_free+0x12f/0x1a0 security/apparmor/lsm.c:62
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.0.0-rc1-next-20190111 #10
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+0x1db/0x2d0 lib/dump_stack.c:113
 panic+0x2cb/0x65c kernel/panic.c:214
 __warn.cold+0x20/0x48 kernel/panic.c:571
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:cred_label security/apparmor/include/cred.h:30 [inline]
RIP: 0010:apparmor_cred_free+0x12f/0x1a0 security/apparmor/lsm.c:62
Code: 7c 88 48 c7 c7 00 d0 7c 88 e8 fd 70 f2 fd 0f 0b eb a9 e8 54 3f 29 fe 48 c7 c6 c0 df 7c 88 48 c7 c7 00 d0 7c 88 e8 e1 70 f2 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 80 38 00 75 4a 4c 8b 2c 25 00
RSP: 0018:ffff8880ae6079f8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff81687fa6 RDI: 0000000000000006
RBP: ffff8880ae607a18 R08: ffffffff8987dec0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a86b3100
R13: ffff8880a86b3100 R14: ffff8880a86b3188 R15: dffffc0000000000
 security_cred_free+0x4b/0xf0 security/security.c:1490
 put_cred_rcu+0x21f/0x6e0 kernel/cred.c:118
 __rcu_reclaim kernel/rcu/rcu.h:240 [inline]
 rcu_do_batch kernel/rcu/tree.c:2486 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2799 [inline]
 rcu_core+0xc4a/0x1680 kernel/rcu/tree.c:2780
 __do_softirq+0x30b/0xb11 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x180/0x1d0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:native_safe_halt+0x2/0x10 arch/x86/include/asm/irqflags.h:58
Code: ff ff ff 48 89 c7 48 89 45 d8 e8 79 6f d0 f9 48 8b 45 d8 e9 ce fe ff ff 48 89 df e8 68 6f d0 f9 eb 82 90 90 90 90 90 90 fb f4 <c3> 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 f4 c3 90 90 90 90 90 90
RSP: 0018:ffffffff89807c60 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1325061 RBX: 1ffffffff1300f8f RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff8987e73c
RBP: ffffffff89807d20 R08: ffffffff8987dec0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff89807cf8 R14: 0000000000000000 R15: ffffffff899282f8
 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:555
 default_idle_call+0x36/0x90 kernel/sched/idle.c:93
 cpuidle_idle_call kernel/sched/idle.c:153 [inline]
 do_idle+0x386/0x5d0 kernel/sched/idle.c:262
 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:353
 rest_init+0x245/0x37b init/main.c:442
 arch_call_rest_init+0xe/0x1b
 start_kernel+0x882/0x8bd init/main.c:742
 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
 x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (109):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/01/11 07:35 linux-next b808822a75a3 80dde172 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2019/01/18 00:35 linux-next a37d50ca3b83 769e75ed .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/17 23:10 linux-next a37d50ca3b83 769e75ed .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/17 22:09 linux-next a37d50ca3b83 769e75ed .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/17 20:41 linux-next a37d50ca3b83 769e75ed .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/17 20:10 linux-next a37d50ca3b83 769e75ed .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/17 18:51 linux-next a37d50ca3b83 769e75ed .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/17 17:08 linux-next a37d50ca3b83 769e75ed .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/17 12:51 linux-next a37d50ca3b83 c2faf9b2 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/17 10:20 linux-next a37d50ca3b83 c2faf9b2 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/17 08:54 linux-next a37d50ca3b83 c2faf9b2 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/17 05:10 linux-next cbeb3db684f7 c2faf9b2 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/17 01:51 linux-next cbeb3db684f7 d538790b .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/16 20:46 linux-next cbeb3db684f7 d538790b .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/16 19:21 linux-next cbeb3db684f7 d538790b .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/16 15:34 linux-next cbeb3db684f7 d538790b .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/16 13:23 linux-next cbeb3db684f7 b47fa78d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/16 08:21 linux-next cbeb3db684f7 b47fa78d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/16 05:37 linux-next 5aa6589e17bd b47fa78d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/16 00:16 linux-next 5aa6589e17bd 79cb1a7c .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/15 22:57 linux-next 5aa6589e17bd 79cb1a7c .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/15 20:21 linux-next 5aa6589e17bd 79cb1a7c .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/15 18:47 linux-next 5aa6589e17bd 79cb1a7c .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/15 15:42 linux-next 5aa6589e17bd 79cb1a7c .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/15 13:07 linux-next 5aa6589e17bd ebacf5cb .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/15 11:00 linux-next 5aa6589e17bd ebacf5cb .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/15 10:21 linux-next 5aa6589e17bd ebacf5cb .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/15 09:19 linux-next 5aa6589e17bd ebacf5cb .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/15 08:06 linux-next 5aa6589e17bd ebacf5cb .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/15 02:51 linux-next 8ce4d582f564 ebacf5cb .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/14 20:14 linux-next 8ce4d582f564 95485883 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/14 17:59 linux-next 8ce4d582f564 95485883 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/14 16:39 linux-next 8ce4d582f564 95485883 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/14 15:24 linux-next 8ce4d582f564 95485883 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/14 12:46 linux-next 8ce4d582f564 95485883 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/14 11:54 linux-next 8ce4d582f564 95485883 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/14 11:48 linux-next 8ce4d582f564 95485883 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/14 11:30 linux-next 8ce4d582f564 95485883 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/14 11:25 linux-next 8ce4d582f564 95485883 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/14 11:24 linux-next 8ce4d582f564 95485883 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/14 11:01 linux-next 8ce4d582f564 95485883 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/14 10:52 linux-next 8ce4d582f564 95485883 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/14 04:26 linux-next b808822a75a3 c3f3344c .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/13 23:52 linux-next b808822a75a3 c3f3344c .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/13 21:15 linux-next b808822a75a3 c3f3344c .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.