KASAN: global-out-of-bounds Read in __aa_lookupn_ns

Status: closed as dup on 2018/09/28 15:01
Subsystems: apparmor
[Documentation on labels]
Reported-by: syzbot+71b6643475f707f93fdc@syzkaller.appspotmail.com
First crash: 2860d, last: 2833d
▶ ▼ Duplicate of
Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported
KASAN: stack-out-of-bounds Read in __aa_lookupn_ns apparmor 17 C 52 2828d 2859d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
KASAN: global-out-of-bounds Read in __aa_lookupn_ns 4 (5) 2018/09/28 15:01

Sample crash report:
==================================================================
BUG: KASAN: global-out-of-bounds in memcmp+0xe3/0x160 lib/string.c:861
Read of size 1 at addr ffffffff88000008 by task syz-executor3/16911

CPU: 1 PID: 16911 Comm: syz-executor3 Not tainted 4.19.0+ #298
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+0x1c4/0x2b6 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
 fqlookupn_profile+0x80/0xc0 security/apparmor/label.c:1844
 aa_label_strn_parse+0xa3a/0x1230 security/apparmor/label.c:1908
IPVS: ftp: loaded support on port[0] = 21
 aa_label_parse+0x42/0x50 security/apparmor/label.c:1943
 aa_change_profile+0x513/0x3260 security/apparmor/domain.c:1362
 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
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:00007fea23bdac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000009 RSI: 0000000020000040 RDI: 0000000000000005
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fea23bdb6d4
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
==================================================================

Crashes (26):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/10/23 04:59 upstream ca9eb48fe01f ecb386fe .config console log report ci-upstream-kasan-gce
2018/10/22 06:05 upstream 467e050e9760 ecb386fe .config console log report ci-upstream-kasan-gce
2018/10/19 03:42 upstream fa520c47eaa1 9aba67b5 .config console log report ci-upstream-kasan-gce-root
2018/10/16 22:13 upstream b955a910d7fd 1ba7fd7e .config console log report ci-upstream-kasan-gce
2018/10/14 11:20 upstream 3a27203102eb caf12900 .config console log report ci-upstream-kasan-gce
2018/10/11 22:00 upstream 0778a9f2dd92 ba6ddb43 .config console log report ci-upstream-kasan-gce-root
2018/10/11 21:40 upstream 9dcd936c5312 ba6ddb43 .config console log report ci-upstream-kasan-gce
2018/10/11 18:48 upstream 9dcd936c5312 ba6ddb43 .config console log report ci-upstream-kasan-gce
2018/10/11 17:29 upstream 9dcd936c5312 5f818b4b .config console log report ci-upstream-kasan-gce-root
2018/10/07 03:25 upstream c1d84a1b42ef 8b311eaf .config console log report ci-upstream-kasan-gce-root
2018/10/06 20:16 upstream 091a1eaa0e30 8b311eaf .config console log report ci-upstream-kasan-gce-root
2018/10/05 19:51 upstream b2e45b46d85b 8b311eaf .config console log report ci-upstream-kasan-gce-root
2018/10/05 16:24 upstream befad944e231 8b311eaf .config console log report ci-upstream-kasan-gce-root
2018/10/02 21:10 upstream 1d2ba7fee28b a316a2af .config console log report ci-upstream-kasan-gce
2018/10/02 18:46 upstream 1d2ba7fee28b a316a2af .config console log report ci-upstream-kasan-gce
2018/09/30 18:02 upstream 291d0e5d81e1 41e4b329 .config console log report ci-upstream-kasan-gce
2018/09/28 11:53 upstream ad0371482b1e 8bb1f0fc .config console log report ci-upstream-kasan-gce
2018/09/25 09:53 upstream 02214bfc89c7 0e7547d7 .config console log report ci-upstream-kasan-gce
2018/09/25 07:43 upstream 02214bfc89c7 0e7547d7 .config console log report ci-upstream-kasan-gce-root
2018/10/01 21:17 linux-next 4794a36bf08d e06f7713 .config console log report ci-upstream-linux-next-kasan-gce-root
2018/10/01 08:29 linux-next 4794a36bf08d 48a50c6b .config console log report ci-upstream-linux-next-kasan-gce-root
2018/10/01 01:13 linux-next 4794a36bf08d 41e4b329 .config console log report ci-upstream-linux-next-kasan-gce-root
2018/09/30 22:24 linux-next 4794a36bf08d 41e4b329 .config console log report ci-upstream-linux-next-kasan-gce-root
2018/09/29 09:22 linux-next 4794a36bf08d 41e4b329 .config console log report ci-upstream-linux-next-kasan-gce-root
2018/09/28 02:18 linux-next 9e27e2c2d003 0c2fa87b .config console log report ci-upstream-linux-next-kasan-gce-root
2018/09/26 06:05 linux-next 8b7a6ebdd4a5 b7e11289 .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.