KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for

KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data (4)
Status: moderation: reported on 2020/12/11 10:03
Reported-by: syzbot+0843a6d7ab43b4fd4ad4@syzkaller.appspotmail.com
First crash: 201d, last: 5d13h

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data (3)	8	225d	336d	0/17	closed as invalid on 2020/06/18 14:24
upstream	KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data (2)	3	422d	430d	0/17	auto-closed as invalid on 2020/02/07 16:47
upstream	KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data	1	457d	457d	0/17	closed as invalid on 2019/11/19 13:44

Sample crash report:

==================================================================
BUG: KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data

write to 0xffff88810a7e3fd4 of 1 bytes by task 1515 on cpu 0:
 af_alg_sendmsg+0xad4/0xcb0 crypto/af_alg.c:968
 skcipher_sendmsg+0x71/0x80 crypto/algif_skcipher.c:47
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x352/0x4c0 net/socket.c:2345
 ___sys_sendmsg net/socket.c:2399 [inline]
 __sys_sendmsg+0x1ed/0x270 net/socket.c:2432
 __do_sys_sendmsg net/socket.c:2441 [inline]
 __se_sys_sendmsg net/socket.c:2439 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2439
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810a7e3fd4 of 1 bytes by task 1526 on cpu 1:
 af_alg_wait_for_data+0x1b0/0x3b0 crypto/af_alg.c:774
 _skcipher_recvmsg crypto/algif_skcipher.c:65 [inline]
 skcipher_recvmsg+0x17a/0x7f0 crypto/algif_skcipher.c:157
 sock_recvmsg_nosec net/socket.c:886 [inline]
 sock_recvmsg net/socket.c:904 [inline]
 __sys_recvfrom+0x1d7/0x2a0 net/socket.c:2032
 __do_sys_recvfrom net/socket.c:2050 [inline]
 __se_sys_recvfrom net/socket.c:2046 [inline]
 __x64_sys_recvfrom+0x74/0x90 net/socket.c:2046
 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: 1 PID: 1526 Comm: syz-executor.1 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (22):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Maintainers
ci2-upstream-kcsan-gce	2021/01/19 19:04	upstream	1e2a199f	63631df1	.config	log	report	info	davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/30 15:03	upstream	139711f0	ecb8c012	.config	log	report	info	davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/03 13:23	upstream	34816d20	59ad4022	.config	log	report	info	davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/11/02 22:33	upstream	495023e4	7f344fa6	.config	log	report	info	davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/26 10:17	upstream	3650b228	a7aac492	.config	log	report	info	davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/24 12:28	upstream	c9c9e6a4	54289b08	.config	log	report	info	davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/23 07:47	upstream	805c6d3c	287cd75a	.config	log	report	info	davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/19 08:20	upstream	92ab97ad	53ce8104	.config	log	report	info	davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/17 01:05	upstream	5925fa68	77507d02	.config	log	report	info	davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/12 04:59	upstream	e8878ab8	79fb24e2	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/21 06:57	upstream	da2968ff	1d75fe45	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/09 19:07	upstream	06a81c1c	70301872	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/07 06:54	upstream	d6efb3ac	cb436c69	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/31 09:28	upstream	e2c46b57	8df85ed9	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/30 19:46	upstream	83bdc727	b0947553	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/26 00:47	upstream	04300d66	1f7cc1ca	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/21 17:33	upstream	4fa640dc	e562dd8a	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/17 21:43	upstream	88825726	9c812472	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/14 15:55	upstream	0dc589da	6f458026	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/10 18:56	upstream	42f82040	56d01184	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/09 18:29	upstream	0bddd227	bc238812	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/07 23:50	upstream	aa27b32b	08fc4ef1	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org