audit: type=1400 audit(1517140809.891:7): avc: denied { map } for pid=3675 comm="syzkaller595958" path="/root/syzkaller595958577" 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 clusterip_config_init_nodelist net/ipv4/netfilter/ipt_CLUSTERIP.c:172 [inline] BUG: KASAN: slab-out-of-bounds in clusterip_config_init net/ipv4/netfilter/ipt_CLUSTERIP.c:227 [inline] BUG: KASAN: slab-out-of-bounds in clusterip_tg_check+0x150f/0x1570 net/ipv4/netfilter/ipt_CLUSTERIP.c:478 Read of size 2 at addr ffff8801bcb41e00 by task syzkaller595958/3675 CPU: 1 PID: 3675 Comm: syzkaller595958 Not tainted 4.15.0-rc9+ #212 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+0x194/0x257 lib/dump_stack.c:53 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_load2_noabort+0x14/0x20 mm/kasan/report.c:428 clusterip_config_init_nodelist net/ipv4/netfilter/ipt_CLUSTERIP.c:172 [inline] clusterip_config_init net/ipv4/netfilter/ipt_CLUSTERIP.c:227 [inline] clusterip_tg_check+0x150f/0x1570 net/ipv4/netfilter/ipt_CLUSTERIP.c:478 xt_check_target+0x22c/0x7d0 net/netfilter/x_tables.c:845 check_target net/ipv4/netfilter/ip_tables.c:518 [inline] find_check_entry.isra.8+0x8c8/0xcb0 net/ipv4/netfilter/ip_tables.c:559 translate_table+0xed1/0x1610 net/ipv4/netfilter/ip_tables.c:730 do_replace net/ipv4/netfilter/ip_tables.c:1146 [inline] do_ipt_set_ctl+0x370/0x5f0 net/ipv4/netfilter/ip_tables.c:1680 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1260 udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2401 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x440b49 RSP: 002b:00007ffdac3b5058 EFLAGS: 00000203 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000440b49 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 0000000000000320 R09: 0000000000000000 R10: 0000000020027000 R11: 0000000000000203 R12: 0000000000402470 R13: 0000000000402500 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 3675: 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 __do_kmalloc_node mm/slab.c:3672 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3679 kmalloc_node include/linux/slab.h:541 [inline] kvmalloc_node+0x99/0xd0 mm/util.c:397 kvmalloc include/linux/mm.h:541 [inline] xt_alloc_table_info+0x64/0xe0 net/netfilter/x_tables.c:1006 do_replace net/ipv4/netfilter/ip_tables.c:1135 [inline] do_ipt_set_ctl+0x29b/0x5f0 net/ipv4/netfilter/ip_tables.c:1680 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1260 udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2401 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 entry_SYSCALL_64_fastpath+0x29/0xa0 Freed by task 1821: 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:3488 [inline] kfree+0xd6/0x260 mm/slab.c:3803 free_pipe_info+0x1f8/0x2a0 fs/pipe.c:678 put_pipe_info+0xb0/0xd0 fs/pipe.c:561 pipe_release+0x1af/0x250 fs/pipe.c:582 __fput+0x327/0x7e0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x199/0x270 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264 entry_SYSCALL_64_fastpath+0x9e/0xa0 The buggy address belongs to the object at ffff8801bcb41b00 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 768 bytes inside of 1024-byte region [ffff8801bcb41b00, ffff8801bcb41f00) The buggy address belongs to the page: page:ffffea0006f2d000 count:1 mapcount:0 mapping:ffff8801bcb40000 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801bcb40000 0000000000000000 0000000100000007 raw: ffffea00076b86a0 ffffea0007663e20 ffff8801dac00ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801bcb41d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801bcb41d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801bcb41e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801bcb41e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801bcb41f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================