KASAN: use-after-free Read in generic_gcmaes

KASAN: use-after-free Read in generic_gcmaes_encrypt
Status: closed as invalid on 2020/06/28 17:44
Reported-by: syzbot+6d3612ba5e254e387153@syzkaller.appspotmail.com
First crash: 1047d, last: 475d

Cause bisection: introduced by (bisect log) :
commit a42055e8d2c30d4decfc13ce943d09c7b9dad221
Author: Vakul Garg <vakul.garg@nxp.com>
Date: Fri Sep 21 04:16:13 2018 +0000

net/tls: Add support for async encryption of records for performance

Crash: KASAN: use-after-free Read in generic_gcmaes_encrypt (log)
Repro: C syz .config

Fix bisection: failed (bisect log)

Sample crash report:

sshd (7864) used greatest stack depth: 15736 bytes left
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
==================================================================
BUG: KASAN: use-after-free in memcpy include/linux/string.h:352 [inline]
BUG: KASAN: use-after-free in generic_gcmaes_encrypt+0xc6/0x190 arch/x86/crypto/aesni-intel_glue.c:1272
Read of size 12 at addr ffff8881d7bf1c00 by task kworker/1:1/22

CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 4.20.0+ #389
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt padata_parallel_worker
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113
 print_address_description.cold.8+0x9/0x1ff 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
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 memcpy+0x23/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:352 [inline]
 generic_gcmaes_encrypt+0xc6/0x190 arch/x86/crypto/aesni-intel_glue.c:1272
 crypto_aead_encrypt include/crypto/aead.h:364 [inline]
 gcmaes_wrapper_encrypt+0x162/0x200 arch/x86/crypto/aesni-intel_glue.c:1124
 crypto_aead_encrypt include/crypto/aead.h:364 [inline]
 pcrypt_aead_enc+0xcb/0x190 crypto/pcrypt.c:143
 padata_parallel_worker+0x49d/0x760 kernel/padata.c:86
 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x440 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Allocated by task 7886:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620
 kmalloc include/linux/slab.h:546 [inline]
 tls_set_sw_offload+0xcb3/0x1390 net/tls/tls_sw.c:1947
 do_tls_setsockopt_conf net/tls/tls_main.c:467 [inline]
 do_tls_setsockopt net/tls/tls_main.c:514 [inline]
 tls_setsockopt+0x689/0x770 net/tls/tls_main.c:533
 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2978
 __sys_setsockopt+0x1ba/0x3c0 net/socket.c:1902
 __do_sys_setsockopt net/socket.c:1913 [inline]
 __se_sys_setsockopt net/socket.c:1910 [inline]
 __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1910
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 7886:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xcf/0x230 mm/slab.c:3817
 tls_sk_proto_close+0x5fa/0x750 net/tls/tls_main.c:277
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:458
 __sock_release+0xd7/0x250 net/socket.c:579
 sock_close+0x19/0x20 net/socket.c:1141
 __fput+0x385/0xa30 fs/file_table.c:278
 ____fput+0x15/0x20 fs/file_table.c:309
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8881d7bf1c00
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8881d7bf1c00, ffff8881d7bf1c20)
The buggy address belongs to the page:
page:ffffea00075efc40 count:1 mapcount:0 mapping:ffff8881da8001c0 index:0xffff8881d7bf1fc1
flags: 0x2fffc0000000200(slab)
raw: 02fffc0000000200 ffffea0006e29f08 ffffea000763cd08 ffff8881da8001c0
raw: ffff8881d7bf1fc1 ffff8881d7bf1000 000000010000001c 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d7bf1b00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8881d7bf1b80: fb fb fb fb fc fc fc fc 00 01 fc fc fc fc fc fc
>ffff8881d7bf1c00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
                   ^
 ffff8881d7bf1c80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8881d7bf1d00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================

Crashes (921):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-kasan-gce-root	2018/12/26 20:50	upstream	5694cecdb092	8a41a0ad	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2018/12/26 19:27	upstream	5694cecdb092	8a41a0ad	.config	log	report	syz	C
ci-upstream-kasan-gce	2018/12/25 15:52	upstream	8fe28cb58bcb	8a41a0ad	.config	log	report	syz	C
ci-upstream-kasan-gce	2018/12/04 10:00	upstream	0072a0c14d5b	03f94a45	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2018/12/04 09:19	upstream	0072a0c14d5b	03f94a45	.config	log	report	syz	C
ci-upstream-net-this-kasan-gce	2018/12/25 15:44	net	38355a5f9a22	8a41a0ad	.config	log	report	syz	C
ci-upstream-net-kasan-gce	2018/09/23 09:32	net-next	739d0def85ca	37079712	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2018/12/28 13:26	linux-next	6a1d293238c1	fc6ae81a	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2018/12/04 18:20	upstream	0072a0c14d5b	6ad0ae61	.config	log	report	syz
ci-upstream-kasan-gce-root	2018/12/04 09:11	upstream	0072a0c14d5b	03f94a45	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2018/12/04 09:12	linux-next	442b8cea2477	03f94a45	.config	log	report	syz
ci-upstream-kasan-gce	2019/01/27 19:28	upstream	ba6069759381	c73f090a	.config	log	report
ci-upstream-kasan-gce	2019/01/27 13:17	upstream	ba6069759381	c73f090a	.config	log	report
ci-upstream-kasan-gce-smack-root	2019/01/26 04:19	upstream	ba6069759381	ebf7a37c	.config	log	report
ci-upstream-kasan-gce-root	2019/01/24 15:01	upstream	30bac164aca7	ce1ccf97	.config	log	report
ci-upstream-kasan-gce-root	2019/01/21 21:39	upstream	49a57857aeea	badbbeee	.config	log	report
ci-upstream-kasan-gce	2019/01/20 22:35	upstream	6e693b3ffecb	fd37a550	.config	log	report
ci-upstream-kasan-gce	2019/01/20 12:29	upstream	b0efca46b570	353f32ea	.config	log	report
ci-upstream-kasan-gce-root	2019/01/18 12:07	upstream	a3a80255d58d	5bf17c30	.config	log	report
ci-upstream-kasan-gce-selinux-root	2019/01/05 17:41	upstream	3fed6ae4b027	53be0a37	.config	log	report
ci-upstream-kasan-gce-386	2019/01/19 03:33	upstream	d7393226d15a	2103a236	.config	log	report
ci-upstream-net-this-kasan-gce	2019/01/30 03:38	net	abfd04f738c2	aa432daf	.config	log	report
ci-upstream-net-this-kasan-gce	2019/01/29 22:35	net	abfd04f738c2	aa432daf	.config	log	report
ci-upstream-net-this-kasan-gce	2019/01/28 15:44	net	abfd04f738c2	629c2a27	.config	log	report
ci-upstream-net-this-kasan-gce	2019/01/27 22:23	net	abfd04f738c2	c73f090a	.config	log	report
ci-upstream-net-this-kasan-gce	2019/01/27 11:21	net	abfd04f738c2	c73f090a	.config	log	report
ci-upstream-net-this-kasan-gce	2019/01/27 07:32	net	abfd04f738c2	c73f090a	.config	log	report
ci-upstream-net-this-kasan-gce	2019/01/25 21:02	net	6eea3527e68a	b5d78bce	.config	log	report
ci-upstream-net-this-kasan-gce	2019/01/23 01:42	net	56cb4e503499	b1ff06b2	.config	log	report
ci-upstream-net-this-kasan-gce	2019/01/22 01:19	net	49a57857aeea	badbbeee	.config	log	report
ci-upstream-net-this-kasan-gce	2019/01/21 11:25	net	6436408e814b	badbbeee	.config	log	report
ci-upstream-net-this-kasan-gce	2019/01/21 06:19	net	6436408e814b	fd37a550	.config	log	report
ci-upstream-net-this-kasan-gce	2019/01/19 09:05	net	8a7fa0c35027	2103a236	.config	log	report
ci-upstream-net-kasan-gce	2019/01/29 19:36	net-next	085c4c7dd2b6	aa432daf	.config	log	report
ci-upstream-net-kasan-gce	2019/01/29 15:24	net-next	085c4c7dd2b6	aa432daf	.config	log	report
ci-upstream-net-kasan-gce	2019/01/29 12:17	net-next	085c4c7dd2b6	aa432daf	.config	log	report
ci-upstream-net-kasan-gce	2019/01/28 18:15	net-next	085c4c7dd2b6	629c2a27	.config	log	report
ci-upstream-net-kasan-gce	2019/01/28 11:41	net-next	085c4c7dd2b6	629c2a27	.config	log	report
ci-upstream-net-kasan-gce	2019/01/27 16:36	net-next	085c4c7dd2b6	c73f090a	.config	log	report
ci-upstream-net-kasan-gce	2019/01/26 20:09	net-next	f859a4484703	c73f090a	.config	log	report
ci-upstream-net-kasan-gce	2019/01/26 15:16	net-next	f859a4484703	c73f090a	.config	log	report
ci-upstream-net-kasan-gce	2019/01/26 02:55	net-next	30e5c2c6bf28	ebf7a37c	.config	log	report
ci-upstream-net-kasan-gce	2019/01/25 12:54	net-next	556b2710a1ca	b5d78bce	.config	log	report
ci-upstream-net-kasan-gce	2019/01/24 18:42	net-next	254764e55652	ce1ccf97	.config	log	report
ci-upstream-net-kasan-gce	2019/01/24 06:34	net-next	33a0efa4baec	56558f63	.config	log	report
ci-upstream-net-kasan-gce	2019/01/24 05:01	net-next	33a0efa4baec	56558f63	.config	log	report
ci-upstream-net-kasan-gce	2019/01/22 16:13	net-next	fa7f3a8d56b3	985f75cc	.config	log	report
ci-upstream-net-kasan-gce	2019/01/22 14:13	net-next	fa7f3a8d56b3	985f75cc	.config	log	report
ci-upstream-net-kasan-gce	2019/01/21 03:45	net-next	4e15cbe82996	fd37a550	.config	log	report
ci-upstream-net-kasan-gce	2019/01/21 01:54	net-next	4e15cbe82996	fd37a550	.config	log	report
ci-upstream-net-kasan-gce	2019/01/20 17:11	net-next	4e15cbe82996	fd37a550	.config	log	report
ci-upstream-net-kasan-gce	2019/01/20 08:51	net-next	133bbb18ab1a	353f32ea	.config	log	report
ci-upstream-net-kasan-gce	2019/01/19 23:22	net-next	133bbb18ab1a	8aa587b0	.config	log	report
ci-upstream-net-kasan-gce	2019/01/19 17:40	net-next	f04d402f2f00	8aa587b0	.config	log	report
ci-upstream-net-kasan-gce	2019/01/19 11:38	net-next	f04d402f2f00	2103a236	.config	log	report
ci-upstream-net-kasan-gce	2019/01/19 01:54	net-next	435f3f267780	2103a236	.config	log	report
ci-upstream-net-kasan-gce	2019/01/18 23:59	net-next	435f3f267780	2103a236	.config	log	report
ci-upstream-net-kasan-gce	2019/01/17 19:50	net-next	44543f1dd2a3	769e75ed	.config	log	report
ci-upstream-net-kasan-gce	2018/09/22 19:16	net-next	bd4d08daeb95	37079712	.config	log	report