KASAN: use-after-free Read in sk_psock

KASAN: use-after-free Read in sk_psock_unlink
Status: upstream: reported syz repro on 2018/10/26 07:37
Reported-by: syzbot+3acd9f67a6a15766686e@syzkaller.appspotmail.com
First crash: 863d, last: 414d

Cause bisection: introduced by (bisect log) :
commit 48a3c64b4649b5b23a4ca756af93b4ee820ff883
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri Jun 29 14:11:03 2018 +0000

Merge tag 'drm-fixes-2018-06-29' of git://anongit.freedesktop.org/drm/drm

Crash: general protection fault in bpf_tcp_close (log)
Repro: syz .config

Fix bisection: failed (bisect log)

Sample crash report:

==================================================================
BUG: KASAN: use-after-free in sk_psock_unlink+0x370/0x440 net/core/sock_map.c:1000
Read of size 4 at addr ffff88809fac7c18 by task syz-executor.0/21304

CPU: 1 PID: 21304 Comm: syz-executor.0 Not tainted 5.5.0-rc6-syzkaller #0
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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:639
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134
 sk_psock_unlink+0x370/0x440 net/core/sock_map.c:1000
 tcp_bpf_remove+0x21/0x50 net/ipv4/tcp_bpf.c:539
 tcp_bpf_close+0x130/0x390 net/ipv4/tcp_bpf.c:579
 inet_release+0xed/0x200 net/ipv4/af_inet.c:427
 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:470
 __sock_release+0xce/0x280 net/socket.c:592
 sock_close+0x1e/0x30 net/socket.c:1270
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x414b91
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffd563b6120 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000414b91
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffd563b6200 R11: 0000000000000293 R12: 000000000075bf20
R13: 00000000000471f2 R14: 00000000007610a8 R15: 000000000075bf2c

Allocated by task 21306:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3551
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:670 [inline]
 sock_hash_alloc net/core/sock_map.c:809 [inline]
 sock_hash_alloc+0x1e3/0x5b0 net/core/sock_map.c:793
 find_and_alloc_map kernel/bpf/syscall.c:123 [inline]
 map_create kernel/bpf/syscall.c:654 [inline]
 __do_sys_bpf+0x478/0x3810 kernel/bpf/syscall.c:3012
 __se_sys_bpf kernel/bpf/syscall.c:2989 [inline]
 __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2989
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 2749:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:335 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3757
 sock_hash_free+0x322/0x490 net/core/sock_map.c:872
 bpf_map_free_deferred+0xb3/0x100 kernel/bpf/syscall.c:327
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2264
 worker_thread+0x98/0xe40 kernel/workqueue.c:2410
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff88809fac7c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff88809fac7c00, ffff88809fac7e00)
The buggy address belongs to the page:
page:ffffea00027eb1c0 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0xffff88809fac7400
raw: 00fffe0000000200 ffffea00029fd748 ffffea000277f608 ffff8880aa400a80
raw: ffff88809fac7400 ffff88809fac7000 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809fac7b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809fac7b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88809fac7c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88809fac7c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809fac7d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (84):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro
ci-upstream-kasan-gce-selinux-root	2020/01/18 01:09	upstream	ab7541c3	3de7aabb	.config	log	report	syz
ci-upstream-kasan-gce-selinux-root	2019/09/13 19:01	upstream	505a8ec7	40fa42bc	.config	log	report	syz
ci-upstream-kasan-gce-root	2019/08/07 05:23	upstream	f4eb1423	c6f01e54	.config	log	report	syz
ci-upstream-kasan-gce-selinux-root	2019/08/07 04:44	upstream	f4eb1423	c6f01e54	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2019/08/07 02:38	upstream	f4eb1423	c6f01e54	.config	log	report	syz
ci-upstream-kasan-gce-root	2019/07/31 20:57	upstream	4010b622	c692b5bd	.config	log	report	syz
ci-upstream-kasan-gce-selinux-root	2019/07/31 20:33	upstream	4010b622	c692b5bd	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2019/07/31 13:42	upstream	629f8205	7c7ded69	.config	log	report	syz
ci-upstream-kasan-gce-root	2019/07/26 08:18	upstream	6789f873	732bc5a0	.config	log	report	syz
ci-upstream-kasan-gce-root	2019/07/19 08:57	upstream	3bfe1fc4	7bb222f7	.config	log	report	syz
ci-upstream-kasan-gce-selinux-root	2019/07/13 00:41	upstream	d7d170a8	baa5258a	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2019/07/10 13:26	upstream	e9a83bd2	f62e1e85	.config	log	report	syz
ci-upstream-kasan-gce-selinux-root	2019/07/01 22:00	upstream	6fbc7275	907bf746	.config	log	report	syz
ci-upstream-kasan-gce-root	2019/07/01 20:47	upstream	6fbc7275	907bf746	.config	log	report	syz
ci-upstream-kasan-gce-root	2019/07/01 09:14	upstream	6fbc7275	699d6448	.config	log	report	syz
ci-upstream-kasan-gce-selinux-root	2019/06/26 09:08	upstream	249155c2	0a8d1a96	.config	log	report	syz
ci-upstream-kasan-gce-selinux-root	2019/06/21 15:30	upstream	abf02e29	34bf9440	.config	log	report	syz
ci-upstream-kasan-gce-selinux-root	2019/06/19 03:59	upstream	29f785ff	e3f76baa	.config	log	report	syz
ci-upstream-kasan-gce-selinux-root	2019/06/18 05:54	upstream	9e0babf2	442206d7	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2019/06/16 13:14	upstream	e01e060f	442206d7	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2019/06/11 21:52	upstream	01ccc3ad	5b5826d0	.config	log	report	syz
ci-upstream-net-this-kasan-gce	2019/07/31 10:44	net	107e47cc	7c7ded69	.config	log	report	syz
ci-upstream-net-this-kasan-gce	2019/07/27 16:15	net	107e47cc	c85e1c5b	.config	log	report	syz
ci-upstream-net-this-kasan-gce	2019/06/26 06:00	net	904d88d7	0a8d1a96	.config	log	report	syz
ci-upstream-net-this-kasan-gce	2019/06/16 10:37	net	ef7bfa84	442206d7	.config	log	report	syz
ci-upstream-net-this-kasan-gce	2019/06/15 12:35	net	35fc07ae	442206d7	.config	log	report	syz
ci-upstream-net-this-kasan-gce	2019/06/11 13:28	net	dce5cccc	5b5826d0	.config	log	report	syz
ci-upstream-net-this-kasan-gce	2019/06/05 17:50	net	f4cfcfbd	bfb4a51e	.config	log	report	syz
ci-upstream-net-this-kasan-gce	2019/05/25 10:52	net	ce8d24f9	85c57315	.config	log	report	syz
ci-upstream-net-kasan-gce	2020/01/17 15:04	net-next	6bc80380	3de7aabb	.config	log	report	syz
ci-upstream-net-kasan-gce	2019/10/13 08:33	net-next	524900a2	426631dd	.config	log	report	syz
ci-upstream-net-kasan-gce	2019/09/17 04:42	net-next	990925fa	51ca0454	.config	log	report	syz
ci-upstream-net-kasan-gce	2019/07/18 23:50	net-next	192f0f8e	7bb222f7	.config	log	report	syz
ci-upstream-net-kasan-gce	2019/06/25 11:55	net-next	7d30a7f6	82c13b6b	.config	log	report	syz
ci-upstream-net-kasan-gce	2019/05/22 14:44	net-next	f49aa1de	84b9d384	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2019/09/01 18:45	linux-next	6d028043	bad3cce2	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2019/08/20 17:43	linux-next	54c851a8	cfc9868f	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2019/07/31 19:49	linux-next	ce96e791	c692b5bd	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2019/06/28 19:53	linux-next	48568d8c	7509bf36	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2019/06/25 03:52	linux-next	9ffadb46	82c13b6b	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2019/06/15 22:27	linux-next	f4788d37	442206d7	.config	log	report	syz
ci-upstream-kasan-gce-selinux-root	2020/01/16 11:29	upstream	f5ae2ea6	f9b69507	.config	log	report
ci-upstream-kasan-gce-selinux-root	2020/01/08 01:33	upstream	ae608821	6738e0b3	.config	log	report
ci-upstream-kasan-gce-selinux-root	2019/10/25 06:34	upstream	39a38bcb	d01bb02a	.config	log	report
ci-upstream-kasan-gce-selinux-root	2019/09/20 12:58	upstream	574cc453	d96e88f3	.config	log	report
ci-upstream-kasan-gce-selinux-root	2019/08/10 11:09	upstream	7f20fd23	acb51638	.config	log	report
ci-upstream-kasan-gce-root	2019/07/29 08:31	upstream	a9815a4f	c85e1c5b	.config	log	report
ci-upstream-kasan-gce-smack-root	2019/06/30 01:40	upstream	72825454	7509bf36	.config	log	report
ci-upstream-kasan-gce-smack-root	2019/06/27 10:44	upstream	249155c2	7509bf36	.config	log	report
ci-upstream-kasan-gce-selinux-root	2019/06/23 09:44	upstream	abf02e29	34bf9440	.config	log	report
ci-upstream-kasan-gce-selinux-root	2019/06/22 23:22	upstream	abf02e29	34bf9440	.config	log	report
ci-upstream-kasan-gce-smack-root	2019/06/22 17:11	upstream	abf02e29	34bf9440	.config	log	report
ci-upstream-kasan-gce-root	2019/06/22 13:32	upstream	abf02e29	34bf9440	.config	log	report
ci-upstream-kasan-gce-root	2019/06/22 09:58	upstream	abf02e29	34bf9440	.config	log	report
ci-upstream-kasan-gce-selinux-root	2019/06/19 07:34	upstream	bed3c0d8	34bf9440	.config	log	report
ci-upstream-kasan-gce-smack-root	2019/06/17 14:56	upstream	9e0babf2	442206d7	.config	log	report
ci-upstream-kasan-gce-smack-root	2019/06/09 17:00	upstream	d1fdb6d8	0159583c	.config	log	report
ci-upstream-kasan-gce-smack-root	2019/06/04 16:06	upstream	788a0249	e41a20c5	.config	log	report
ci-upstream-kasan-gce-smack-root	2019/06/04 08:04	upstream	788a0249	ce07a7ae	.config	log	report
ci-upstream-kasan-gce-selinux-root	2019/05/27 10:44	upstream	cd6c84d8	562efd79	.config	log	report
ci-upstream-kasan-gce-selinux-root	2019/01/20 13:41	upstream	6e693b3f	353f32ea	.config	log	report
ci-upstream-kasan-gce-smack-root	2018/12/14 10:51	upstream	65e08c5e	fe7127be	.config	log	report
ci-upstream-kasan-gce-smack-root	2018/12/02 04:15	upstream	4b783176	5a581673	.config	log	report
ci-upstream-kasan-gce-selinux-root	2018/11/27 00:56	upstream	6f8b52ba	ac912200	.config	log	report
ci-upstream-kasan-gce-root	2018/11/14 12:30	upstream	ccda4af0	5f5f6d14	.config	log	report
ci-upstream-kasan-gce-root	2018/11/14 07:52	upstream	ccda4af0	5f5f6d14	.config	log	report
ci-upstream-net-this-kasan-gce	2019/07/10 21:18	net	e858faf5	ff7bf04c	.config	log	report
ci-upstream-net-kasan-gce	2019/09/04 20:28	net-next	2c1f9e26	040fda58	.config	log	report
ci-upstream-net-kasan-gce	2019/08/29 23:08	net-next	d00ee466	fd37b39e	.config	log	report
ci-upstream-net-kasan-gce	2019/06/08 13:19	net-next	a6cdeeb1	cf9c3a50	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2019/11/07 10:06	linux-next	c68c5373	d797d201	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2019/09/22 08:33	linux-next	b5b3bd89	d96e88f3	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2019/08/31 02:30	linux-next	ed2393ca	fd37b39e	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2019/07/12 12:31	linux-next	2c51253c	baa5258a	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2019/07/01 13:45	linux-next	48a8a5f9	907bf746	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2019/06/26 05:24	linux-next	90203176	0a8d1a96	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2019/06/22 06:29	linux-next	dc636f5d	34bf9440	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2019/06/20 17:31	linux-next	dc636f5d	34bf9440	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2019/06/18 01:45	linux-next	a125097c	442206d7	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2019/06/16 08:30	linux-next	f4788d37	442206d7	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2019/06/10 06:59	linux-next	3f310e51	0159583c	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2019/06/08 02:13	linux-next	3f310e51	cf9c3a50	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2018/12/08 09:08	linux-next	74c4a24d	65ed2472	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2018/10/25 20:12	linux-next	8c60c36d	a8292de9	.config	log	report