audit: type=1400 audit(1519570733.003:6): avc: denied { map } for pid=4230 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1519570739.302:7): avc: denied { map } for pid=4244 comm="syzkaller742220" path="/root/syzkaller742220966" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 ================================================================== BUG: KASAN: slab-out-of-bounds in sock_net_uid include/net/sock.h:1732 [inline] BUG: KASAN: slab-out-of-bounds in ip6_route_me_harder+0x9d8/0xc00 net/ipv6/netfilter.c:26 Read of size 4 at addr ffff8801b0ae61a8 by task syzkaller742220/4244 CPU: 0 PID: 4244 Comm: syzkaller742220 Not tainted 4.16.0-rc2+ #328 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23b/0x360 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 sock_net_uid include/net/sock.h:1732 [inline] ip6_route_me_harder+0x9d8/0xc00 net/ipv6/netfilter.c:26 ip6t_mangle_out net/ipv6/netfilter/ip6table_mangle.c:63 [inline] ip6table_mangle_hook+0x636/0x920 net/ipv6/netfilter/ip6table_mangle.c:77 nf_hook_entry_hookfn include/linux/netfilter.h:120 [inline] nf_hook_slow+0xba/0x1a0 net/netfilter/core.c:483 nf_hook include/linux/netfilter.h:243 [inline] NF_HOOK include/linux/netfilter.h:286 [inline] ip6_xmit+0x10ec/0x2260 net/ipv6/ip6_output.c:277 tcp_v6_send_synack+0x57b/0xaa0 net/ipv6/tcp_ipv6.c:490 tcp_conn_request+0x26fd/0x3660 net/ipv4/tcp_input.c:6336 tcp_v6_conn_request+0x212/0x270 net/ipv6/tcp_ipv6.c:1021 tcp_rcv_state_process+0x8f5/0x4920 net/ipv4/tcp_input.c:5845 tcp_v6_do_rcv+0x739/0x1250 net/ipv6/tcp_ipv6.c:1331 tcp_v6_rcv+0x24a1/0x2d70 net/ipv6/tcp_ipv6.c:1510 ip6_input_finish+0x37e/0x17a0 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:288 [inline] ip6_input+0xdb/0x560 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:449 [inline] ip6_rcv_finish+0x297/0x8c0 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:288 [inline] ipv6_rcv+0xf37/0x1fa0 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4554 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4619 process_backlog+0x203/0x740 net/core/dev.c:5299 napi_poll net/core/dev.c:5697 [inline] net_rx_action+0x792/0x1910 net/core/dev.c:5763 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1011 do_softirq.part.19+0x14d/0x190 kernel/softirq.c:329 do_softirq kernel/softirq.c:177 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:182 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:726 [inline] ip6_finish_output2+0xba0/0x23a0 net/ipv6/ip6_output.c:121 ip6_finish_output+0x69b/0xaf0 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:277 [inline] ip6_output+0x1eb/0x840 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:443 [inline] NF_HOOK include/linux/netfilter.h:288 [inline] ip6_xmit+0xe1f/0x2260 net/ipv6/ip6_output.c:277 inet6_csk_xmit+0x2fc/0x580 net/ipv6/inet6_connection_sock.c:139 tcp_transmit_skb+0x1b12/0x3960 net/ipv4/tcp_output.c:1176 tcp_send_syn_data net/ipv4/tcp_output.c:3487 [inline] tcp_connect+0x1f45/0x40f0 net/ipv4/tcp_output.c:3526 tcp_v6_connect+0x2083/0x26c0 net/ipv6/tcp_ipv6.c:306 __inet_stream_connect+0x2d4/0xf00 net/ipv4/af_inet.c:620 tcp_sendmsg_fastopen net/ipv4/tcp.c:1168 [inline] tcp_sendmsg_locked+0x264e/0x3c70 net/ipv4/tcp.c:1214 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1463 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 SYSC_sendto+0x361/0x5c0 net/socket.c:1747 SyS_sendto+0x40/0x50 net/socket.c:1715 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x441e79 RSP: 002b:00007fff72bb92f8 EFLAGS: 00000212 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000441e79 RDX: 0000000000000000 RSI: 00000000204e8000 RDI: 0000000000000004 RBP: 00000000006cc018 R08: 000000002007f000 R09: 000000000000001c R10: 0000000020000001 R11: 0000000000000212 R12: 00000000004037a0 R13: 0000000000403830 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 4242: 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:552 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3541 getname_flags+0xcb/0x580 fs/namei.c:138 getname+0x19/0x20 fs/namei.c:209 do_sys_open+0x2e7/0x6d0 fs/open.c:1053 SYSC_open fs/open.c:1077 [inline] SyS_open+0x2d/0x40 fs/open.c:1072 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 4242: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3485 [inline] kmem_cache_free+0x83/0x2a0 mm/slab.c:3743 putname+0xee/0x130 fs/namei.c:258 do_sys_open+0x31b/0x6d0 fs/open.c:1068 SYSC_open fs/open.c:1077 [inline] SyS_open+0x2d/0x40 fs/open.c:1072 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8801b0ae6e80 which belongs to the cache names_cache of size 4096 The buggy address is located 3288 bytes to the left of 4096-byte region [ffff8801b0ae6e80, ffff8801b0ae7e80) The buggy address belongs to the page: page:ffffea0006c2b980 count:1 mapcount:0 mapping:ffff8801b0ae6e80 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801b0ae6e80 0000000000000000 0000000100000001 raw: ffffea0006c2b820 ffffea0006c2dd20 ffff8801da5d6600 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b0ae6080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801b0ae6100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801b0ae6180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801b0ae6200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801b0ae6280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================