KCSAN: data-race in tomoyo_domain_quota_is_ok / tomoyo_merge_path

KCSAN: data-race in tomoyo_domain_quota_is_ok / tomoyo_merge_path_acl (4)
Status: fixed on 2021/04/09 19:46
Reported-by: syzbot+0789a72b46fd91431bd8@syzkaller.appspotmail.com
Fix commit: 5797e861e402 tomoyo: ignore data race while checking quota
First crash: 338d, last: 217d

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in tomoyo_domain_quota_is_ok / tomoyo_merge_path_acl	2	682d	695d	0/22	closed as invalid on 2019/11/19 13:54
upstream	KCSAN: data-race in tomoyo_domain_quota_is_ok / tomoyo_merge_path_acl (3)	5	382d	444d	0/22	auto-closed as invalid on 2020/10/05 09:28
upstream	KCSAN: data-race in tomoyo_domain_quota_is_ok / tomoyo_merge_path_acl (2)	15	463d	665d	0/22	closed as invalid on 2020/06/18 14:24

Sample crash report:

==================================================================
BUG: KCSAN: data-race in tomoyo_domain_quota_is_ok / tomoyo_merge_path_acl

write to 0xffff8881077d121a of 2 bytes by task 8454 on cpu 1:
 tomoyo_merge_path_acl+0x4c/0x70 security/tomoyo/file.c:372
 tomoyo_update_domain+0x337/0x3a0 security/tomoyo/domain.c:131
 tomoyo_update_path_acl security/tomoyo/file.c:398 [inline]
 tomoyo_write_file+0x210/0x910 security/tomoyo/file.c:1022
 tomoyo_write_domain2 security/tomoyo/common.c:1152 [inline]
 tomoyo_add_entry security/tomoyo/common.c:2042 [inline]
 tomoyo_supervisor+0xace/0xb40 security/tomoyo/common.c:2103
 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline]
 tomoyo_path_permission security/tomoyo/file.c:587 [inline]
 tomoyo_check_open_permission+0x2d0/0x370 security/tomoyo/file.c:780
 tomoyo_file_open+0xd3/0xf0 security/tomoyo/tomoyo.c:313
 security_file_open+0x3f/0x90 security/security.c:1576
 do_dentry_open+0x22d/0x890 fs/open.c:804
 vfs_open+0x43/0x50 fs/open.c:931
 do_open fs/namei.c:3254 [inline]
 path_openat+0x1847/0x20a0 fs/namei.c:3371
 do_filp_open+0xbd/0x1d0 fs/namei.c:3398
 do_sys_openat2+0xa3/0x250 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_openat fs/open.c:1204 [inline]
 __se_sys_openat fs/open.c:1199 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1199
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881077d121a of 2 bytes by task 8457 on cpu 0:
 tomoyo_domain_quota_is_ok+0xd7/0x2d0 security/tomoyo/util.c:1064
 tomoyo_supervisor+0x1f4/0xb40 security/tomoyo/common.c:2089
 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline]
 tomoyo_path_number_perm+0x227/0x2d0 security/tomoyo/file.c:734
 tomoyo_path_chmod+0x23/0x30 security/tomoyo/tomoyo.c:342
 security_path_chmod+0x92/0xe0 security/security.c:1153
 chmod_common+0xe6/0x280 fs/open.c:578
 do_fchmodat fs/open.c:621 [inline]
 __do_sys_fchmodat fs/open.c:634 [inline]
 __se_sys_fchmodat fs/open.c:631 [inline]
 __x64_sys_fchmodat+0x9b/0x120 fs/open.c:631
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8457 Comm: syz-fuzzer Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (12):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/02/12 06:03	upstream	291009f656e8	a5f86b15	.config	log	report	info	KCSAN: data-race in tomoyo_domain_quota_is_ok / tomoyo_merge_path_acl
ci2-upstream-kcsan-gce	2021/02/05 18:57	upstream	dd86e7fa07a3	23a562df	.config	log	report	info	KCSAN: data-race in tomoyo_domain_quota_is_ok / tomoyo_merge_path_acl
ci2-upstream-kcsan-gce	2021/01/24 04:35	upstream	e1ae4b0be158	52e37319	.config	log	report	info	KCSAN: data-race in tomoyo_domain_quota_is_ok / tomoyo_merge_path_acl
ci2-upstream-kcsan-gce	2021/01/13 13:07	upstream	e609571b5ffa	a945f0a3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/11 12:09	upstream	7c53f6b671f4	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/31 02:20	upstream	f6e1ea196492	5cc121d6	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/30 07:23	upstream	139711f033f6	0fa352f2	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/22 04:33	upstream	8653b778e454	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/24 04:57	upstream	d5beb3140f91	1ab681a4	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/21 11:02	upstream	27bba9c532a8	c7ec2d19	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/21 14:47	upstream	c4d6fe731176	99c64d5c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/13 21:12	upstream	6ad4bf6ea160	fc7735a2	.config	log	report	info