random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) ================================================================== BUG: KASAN: stack-out-of-bounds in strlen lib/string.c:481 [inline] BUG: KASAN: stack-out-of-bounds in strlcpy+0x101/0x120 lib/string.c:141 Read of size 1 at addr ffff8800b4167acc by task syzkaller894244/3330 CPU: 0 PID: 3330 Comm: syzkaller894244 Not tainted 4.4.107-g610c835 #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 2c8c0363512a7efd ffff8800b41679a8 ffffffff81d0457d ffffea0002d059c0 ffff8800b4167acc 0000000000000000 ffff8800b4167acc ffff8800b4167bb0 ffff8800b41679e0 ffffffff814fbb23 ffff8800b4167acc Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x124 lib/dump_stack.c:51 [] print_address_description+0x73/0x260 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report+0x285/0x370 mm/kasan/report.c:408 [] __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:426 [] strlen lib/string.c:481 [inline] [] strlcpy+0x101/0x120 lib/string.c:141 [] xt_copy_counters_from_user+0x152/0x2c0 net/netfilter/x_tables.c:793 [] do_add_counters+0x96/0x590 net/ipv6/netfilter/ip6_tables.c:1334 [] compat_do_ipt_set_ctl+0xbf/0x150 net/ipv4/netfilter/ip_tables.c:1725 [] compat_nf_sockopt net/netfilter/nf_sockopt.c:143 [inline] [] compat_nf_setsockopt+0x88/0x130 net/netfilter/nf_sockopt.c:155 [] compat_ip_setsockopt+0x9d/0xf0 net/ipv4/ip_sockglue.c:1255 [] compat_udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2164 [] compat_ipv6_setsockopt+0xb2/0x1e0 net/ipv6/ipv6_sockglue.c:926 [] inet_csk_compat_setsockopt+0x95/0x120 net/ipv4/inet_connection_sock.c:914 [] compat_tcp_setsockopt+0x3d/0x70 net/ipv4/tcp.c:2643 [] compat_sock_common_setsockopt+0xb2/0x140 net/core/sock.c:2670 [] C_SYSC_setsockopt net/compat.c:384 [inline] [] compat_SyS_setsockopt+0x149/0x290 net/compat.c:367 [] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline] [] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457 [] sysenter_flags_fixed+0xd/0x17 The buggy address belongs to the page: page:ffffea0002d059c0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x4000000000000000() page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8800b4167980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8800b4167a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8800b4167a80: 00 f1 f1 f1 f1 00 00 00 00 04 f2 f2 f2 00 00 00 ^ ffff8800b4167b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8800b4167b80: 00 00 f1 f1 f1 f1 00 00 00 00 00 f2 f2 f2 00 00 ==================================================================