KASAN: use-after-free Read in __lock

[upstream] KASAN: use-after-free Read in __lock_sock
Status: upstream: reported syz repro on 2018/11/17 07:18
Reported-by: syzbot+9276d76e83e3bcde6c99@syzkaller.appspotmail.com
First: 66d, last: 3d11h

Sample crash report:

8021q: adding VLAN 0 to HW filter on device team0
8021q: adding VLAN 0 to HW filter on device team0
audit: type=1400 audit(1544033924.799:39): avc:  denied  { associate } for  pid=6234 comm="syz-executor3" name="syz3" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1
hrtimer: interrupt took 36373 ns
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x36d9/0x4c20 kernel/locking/lockdep.c:3218
Read of size 8 at addr ffff8881b0f54820 by task syz-executor2/7909

CPU: 0 PID: 7909 Comm: syz-executor2 Not tainted 4.20.0-rc5+ #142
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+0x244/0x39d lib/dump_stack.c:113
 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 __lock_acquire+0x36d9/0x4c20 kernel/locking/lockdep.c:3218
 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:168
 spin_lock_bh include/linux/spinlock.h:334 [inline]
 __lock_sock+0x203/0x350 net/core/sock.c:2253
 lock_sock_nested+0xfe/0x120 net/core/sock.c:2774
 lock_sock include/net/sock.h:1492 [inline]
 sctp_sock_dump+0x122/0xb20 net/sctp/diag.c:324
 sctp_for_each_transport+0x2b5/0x370 net/sctp/socket.c:5075
 sctp_diag_dump+0x3ac/0x660 net/sctp/diag.c:527
 __inet_diag_dump+0xa8/0x140 net/ipv4/inet_diag.c:1049
 inet_diag_dump+0x9b/0x110 net/ipv4/inet_diag.c:1065
 netlink_dump+0x606/0x1080 net/netlink/af_netlink.c:2244
 __netlink_dump_start+0x59a/0x7c0 net/netlink/af_netlink.c:2352
 netlink_dump_start include/linux/netlink.h:216 [inline]
 inet_diag_handler_cmd+0x2ce/0x3f0 net/ipv4/inet_diag.c:1170
 __sock_diag_cmd net/core/sock_diag.c:232 [inline]
 sock_diag_rcv_msg+0x31d/0x410 net/core/sock_diag.c:263
 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2477
 sock_diag_rcv+0x2a/0x40 net/core/sock_diag.c:274
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0x5a5/0x760 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:631
 sock_write_iter+0x35e/0x5c0 net/socket.c:900
 call_write_iter include/linux/fs.h:1857 [inline]
 do_iter_readv_writev+0x8b0/0xa80 fs/read_write.c:680
 do_iter_write+0x185/0x5f0 fs/read_write.c:959
 vfs_writev+0x1f1/0x360 fs/read_write.c:1004
 do_writev+0x11a/0x310 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 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:00007f75b80d7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000001 RSI: 000000002051c000 RDI: 000000000000000a
RBP: 000000000072c0e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f75b80d86d4
R13: 00000000004c3807 R14: 00000000004d9f50 R15: 00000000ffffffff

Allocated by task 7881:
 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
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554
 sk_prot_alloc+0x69/0x2e0 net/core/sock.c:1463
 sk_alloc+0x10d/0x1690 net/core/sock.c:1523
 inet_create+0x509/0x1070 net/ipv4/af_inet.c:321
 __sock_create+0x536/0x930 net/socket.c:1277
 sock_create net/socket.c:1317 [inline]
 __sys_socket+0x106/0x260 net/socket.c:1347
 __do_sys_socket net/socket.c:1356 [inline]
 __se_sys_socket net/socket.c:1354 [inline]
 __x64_sys_socket+0x73/0xb0 net/socket.c:1354
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 7908:
 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]
 kmem_cache_free+0x83/0x290 mm/slab.c:3760
 sk_prot_free net/core/sock.c:1504 [inline]
 __sk_destruct+0x728/0xa80 net/core/sock.c:1588
 sk_destruct+0x78/0x90 net/core/sock.c:1596
 __sk_free+0xcf/0x300 net/core/sock.c:1607
 sk_free+0x42/0x50 net/core/sock.c:1618
 sock_put include/net/sock.h:1693 [inline]
 sctp_close+0x8d4/0xad0 net/sctp/socket.c:1569
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428
 __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
 get_signal+0x1558/0x1980 kernel/signal.c:2347
 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
 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 ffff8881b0f54780
 which belongs to the cache SCTP(33:syz2) of size 1776
The buggy address is located 160 bytes inside of
 1776-byte region [ffff8881b0f54780, ffff8881b0f54e70)
The buggy address belongs to the page:
page:ffffea0006c3d500 count:1 mapcount:0 mapping:ffff8881d9391e40 index:0x0
flags: 0x2fffc0000000200(slab)
raw: 02fffc0000000200 ffffea0007310108 ffff8881cc327148 ffff8881d9391e40
raw: 0000000000000000 ffff8881b0f54000 0000000100000002 ffff8881c0f20580
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8881c0f20580

Memory state around the buggy address:
 ffff8881b0f54700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881b0f54780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881b0f54800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff8881b0f54880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881b0f54900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

All crashes (10):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	Maintainers
ci-upstream-kasan-gce-selinux-root	2018/12/05 18:31	upstream	0072a0c1	ac6c0578	.config	log	report	syz	davem@davemloft.net, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, marcelo.leitner@gmail.com, netdev@vger.kernel.org, nhorman@tuxdriver.com, vyasevich@gmail.com
ci-upstream-linux-next-kasan-gce-root	2018/12/05 19:10	linux-next	442b8cea	ac6c0578	.config	log	report	syz	davem@davemloft.net, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, marcelo.leitner@gmail.com, netdev@vger.kernel.org, nhorman@tuxdriver.com, vyasevich@gmail.com
ci-upstream-kasan-gce	2018/11/14 05:47	upstream	ccda4af0	5f5f6d14	.config	log	report		davem@davemloft.net, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, marcelo.leitner@gmail.com, netdev@vger.kernel.org, nhorman@tuxdriver.com, vyasevich@gmail.com
ci-upstream-kasan-gce-selinux-root	2019/01/14 21:32	upstream	37198768	ebacf5cb	.config	log	report		davem@davemloft.net, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, marcelo.leitner@gmail.com, netdev@vger.kernel.org, nhorman@tuxdriver.com, vyasevich@gmail.com
ci-upstream-kasan-gce-selinux-root	2018/12/05 17:43	upstream	0072a0c1	ac6c0578	.config	log	report		davem@davemloft.net, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, marcelo.leitner@gmail.com, netdev@vger.kernel.org, nhorman@tuxdriver.com, vyasevich@gmail.com
ci-upstream-kasan-gce-selinux-root	2018/11/16 20:45	upstream	e6a2562f	b08ee62a	.config	log	report		davem@davemloft.net, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, marcelo.leitner@gmail.com, netdev@vger.kernel.org, nhorman@tuxdriver.com, vyasevich@gmail.com
ci-upstream-net-this-kasan-gce	2018/11/14 17:44	net	db8ddde7	5f5f6d14	.config	log	report		asmadeus@codewreck.org, davem@davemloft.net, edumazet@google.com, ktkhai@virtuozzo.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, tom@quantonium.net, viro@ZenIV.linux.org.uk
ci-upstream-net-kasan-gce	2018/11/13 07:01	net-next	261501d9	74dbb806	.config	log	report		davem@davemloft.net, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, marcelo.leitner@gmail.com, netdev@vger.kernel.org, nhorman@tuxdriver.com, vyasevich@gmail.com
ci-upstream-net-kasan-gce	2018/12/30 19:21	net-next	b71acb0e	9942de5f	.config	log	report		asmadeus@codewreck.org, davem@davemloft.net, edumazet@google.com, ktkhai@virtuozzo.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, stephen@networkplumber.org, tom@quantonium.net
ci-upstream-net-kasan-gce	2018/11/14 08:36	net-next	3e536cff	5f5f6d14	.config	log	report		davem@davemloft.net, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, marcelo.leitner@gmail.com, netdev@vger.kernel.org, nhorman@tuxdriver.com, vyasevich@gmail.com