random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) audit: type=1400 audit(1579650957.147:36): avc: denied { map } for pid=7369 comm="syz-executor521" path="/root/syz-executor521664430" dev="sda1" ino=16483 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 ipt_init_target+0x24e/0x290 net/sched/act_ipt.c:46 Read of size 1 at addr ffff88809fb90a1f by task syz-executor521/7369 CPU: 1 PID: 7369 Comm: syz-executor521 Not tainted 4.14.166-syzkaller #0 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+0x142/0x197 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:427 ipt_init_target+0x24e/0x290 net/sched/act_ipt.c:46 __tcf_ipt_init+0x48c/0xb50 net/sched/act_ipt.c:168 tcf_xt_init+0x4e/0x60 net/sched/act_ipt.c:210 tcf_action_init_1+0x53c/0xaa0 net/sched/act_api.c:682 tcf_action_init+0x2ab/0x480 net/sched/act_api.c:751 tcf_action_add net/sched/act_api.c:1079 [inline] tc_ctl_action+0x30a/0x548 net/sched/act_api.c:1131 rtnetlink_rcv_msg+0x3da/0xb70 net/core/rtnetlink.c:4306 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4318 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x44d/0x650 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xb9/0x140 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2103 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x440579 RSP: 002b:00007ffdc216e4b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440579 RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000401e00 R13: 0000000000401e90 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 7369: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc_track_caller+0x159/0x790 mm/slab.c:3735 kmemdup+0x27/0x60 mm/util.c:118 kmemdup include/linux/string.h:420 [inline] __tcf_ipt_init+0x463/0xb50 net/sched/act_ipt.c:164 tcf_xt_init+0x4e/0x60 net/sched/act_ipt.c:210 tcf_action_init_1+0x53c/0xaa0 net/sched/act_api.c:682 tcf_action_init+0x2ab/0x480 net/sched/act_api.c:751 tcf_action_add net/sched/act_api.c:1079 [inline] tc_ctl_action+0x30a/0x548 net/sched/act_api.c:1131 rtnetlink_rcv_msg+0x3da/0xb70 net/core/rtnetlink.c:4306 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4318 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x44d/0x650 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xb9/0x140 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2103 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 5391: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 kvfree+0x4d/0x60 mm/util.c:416 setxattr+0x1f8/0x350 fs/xattr.c:455 path_setxattr+0x11f/0x140 fs/xattr.c:472 SYSC_lsetxattr fs/xattr.c:494 [inline] SyS_lsetxattr+0x38/0x50 fs/xattr.c:490 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff88809fb90a00 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 31 bytes inside of 32-byte region [ffff88809fb90a00, ffff88809fb90a20) The buggy address belongs to the page: page:ffffea00027ee400 count:1 mapcount:0 mapping:ffff88809fb90000 index:0xffff88809fb90fc1 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff88809fb90000 ffff88809fb90fc1 000000010000003f raw: ffffea00027d0f20 ffffea00029549e0 ffff8880aa8001c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809fb90900: 00 04 fc fc fc fc fc fc 00 04 fc fc fc fc fc fc ffff88809fb90980: fb fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc >ffff88809fb90a00: 04 fc fc fc fc fc fc fc 00 00 fc fc fc fc fc fc ^ ffff88809fb90a80: 00 00 00 fc fc fc fc fc 00 07 fc fc fc fc fc fc ffff88809fb90b00: 00 fc fc fc fc fc fc fc 00 01 fc fc fc fc fc fc ==================================================================