On Tue, Oct 24, 2017 at 5:20 PM, syzbot
<
bot+a9d6dccad76c3e1f6c...@syzkaller.appspotmail.com>
wrote:
This also happened on more recent commits, including linux-next
36ef71cae353f88fd6e095e2aaa3e5953af1685d (Oct 19), with a similar
signature:
==================================================================
BUG: KASAN: slab-out-of-bounds in
tipc_nametbl_lookup_dst_nodes+0x448/0x4b0 net/tipc/name_table.c:700
Read of size 4 at addr ffff8801c84aa050 by task syz-executor1/6930
CPU: 0 PID: 6930 Comm: syz-executor1 Not tainted 4.14.0-rc5-next-20171018+ #36
Hardware name: Google Google Compute Engine/Google Compute Engine,
BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:16 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:52
print_address_description+0x73/0x250 mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report+0x25b/0x340 mm/kasan/report.c:409
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
tipc_nametbl_lookup_dst_nodes+0x448/0x4b0 net/tipc/name_table.c:700
tipc_sendmcast+0x794/0xe70 net/tipc/socket.c:791
__tipc_sendmsg+0xebf/0x1b20 net/tipc/socket.c:1316
tipc_sendmsg+0x50/0x70 net/tipc/socket.c:1250
sock_sendmsg_nosec net/socket.c:632 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:642
___sys_sendmsg+0x755/0x890 net/socket.c:2048
__sys_sendmsg+0xe5/0x210 net/socket.c:2082
SYSC_sendmsg net/socket.c:2093 [inline]
SyS_sendmsg+0x2d/0x50 net/socket.c:2089
entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452719
RSP: 002b:00007fe17302fbe8 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452719
RDX: 0000000000000000 RSI: 0000000020316000 RDI: 0000000000000013
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ef1b0
R13: 00000000ffffffff R14: 00007fe1730306d4 R15: 0000000000000000
Allocated by task 3449:
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3614
kmalloc include/linux/slab.h:502 [inline]
kmalloc_array include/linux/slab.h:620 [inline]
kcalloc include/linux/slab.h:632 [inline]
tipc_subseq_alloc net/tipc/name_table.c:142 [inline]
tipc_nameseq_create+0xe8/0x540 net/tipc/name_table.c:153
tipc_nametbl_insert_publ+0xf77/0x17c0 net/tipc/name_table.c:477
tipc_nametbl_publish+0x2aa/0x4f0 net/tipc/name_table.c:762
tipc_net_start+0x26f/0x450 net/tipc/net.c:120
tipc_nl_net_set+0x4cf/0x770 net/tipc/net.c:245
__tipc_nl_compat_doit net/tipc/netlink_compat.c:316 [inline]
tipc_nl_compat_doit+0x431/0x660 net/tipc/netlink_compat.c:335
tipc_nl_compat_handle net/tipc/netlink_compat.c:1158 [inline]
tipc_nl_compat_recv+0xbe8/0x18f0 net/tipc/netlink_compat.c:1201
genl_family_rcv_msg+0x7b7/0xfb0 net/netlink/genetlink.c:598
genl_rcv_msg+0xb2/0x140 net/netlink/genetlink.c:623
netlink_rcv_skb+0x216/0x440 net/netlink/af_netlink.c:2409
genl_rcv+0x28/0x40 net/netlink/genetlink.c:634
netlink_unicast_kernel net/netlink/af_netlink.c:1273 [inline]
netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1299
netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1862
sock_sendmsg_nosec net/socket.c:632 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:642
sock_write_iter+0x31a/0x5d0 net/socket.c:911
call_write_iter include/linux/fs.h:1770 [inline]
new_sync_write fs/read_write.c:468 [inline]
__vfs_write+0x684/0x970 fs/read_write.c:481
vfs_write+0x189/0x510 fs/read_write.c:543
SYSC_write fs/read_write.c:588 [inline]
SyS_write+0xef/0x220 fs/read_write.c:580
entry_SYSCALL_64_fastpath+0x1f/0xbe
Freed by task 1921:
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3492 [inline]
kfree+0xca/0x250 mm/slab.c:3807
selinux_cred_free+0x48/0x70 security/selinux/hooks.c:3798
security_cred_free+0x48/0x80 security/security.c:994
put_cred_rcu+0x106/0x400 kernel/cred.c:117
__rcu_reclaim kernel/rcu/rcu.h:172 [inline]
rcu_do_batch kernel/rcu/tree.c:2676 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2897 [inline]
rcu_process_callbacks+0xd74/0x17d0 kernel/rcu/tree.c:2914
__do_softirq+0x2d7/0xb85 kernel/softirq.c:284
The buggy address belongs to the object at ffff8801c84aa040
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
32-byte region [ffff8801c84aa040, ffff8801c84aa060)
The buggy address belongs to the page:
page:ffffea0007212a80 count:1 mapcount:0 mapping:ffff8801c84aa000
index:0xffff8801c84aafc1
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801c84aa000 ffff8801c84aafc1 000000010000003c
raw: ffffea000721cf60 ffffea00072f2ba0 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801c84a9f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8801c84a9f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8801c84aa000: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
^
ffff8801c84aa080: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
ffff8801c84aa100: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================
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