random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) ================================================================== BUG: KASAN: slab-out-of-bounds in nla_strlcpy+0x13d/0x150 lib/nlattr.c:314 Read of size 1 at addr ffff8801acfbd01d by task syz-executor759/4538 CPU: 1 PID: 4538 Comm: syz-executor759 Not tainted 4.17.0-rc6+ #64 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 nla_strlcpy+0x13d/0x150 lib/nlattr.c:314 nfnl_acct_new+0x574/0xc50 net/netfilter/nfnetlink_acct.c:118 nfnetlink_rcv_msg+0xdb5/0xff0 net/netfilter/nfnetlink.c:212 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2448 nfnetlink_rcv+0x1fe/0x1ba0 net/netfilter/nfnetlink.c:513 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x58b/0x740 net/netlink/af_netlink.c:1336 netlink_sendmsg+0x9f0/0xfa0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:639 sock_write_iter+0x35a/0x5a0 net/socket.c:908 call_write_iter include/linux/fs.h:1784 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x64d/0x960 fs/read_write.c:487 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x43fcf9 RSP: 002b:00007ffecfa84e08 EFLAGS: 00000213 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcf9 RDX: 000000000000001f RSI: 0000000020390000 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401620 R13: 00000000004016b0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 4528: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554 skb_clone+0x1ed/0x4f0 net/core/skbuff.c:1282 dev_queue_xmit_nit+0x44a/0xc50 net/core/dev.c:1987 xmit_one net/core/dev.c:3048 [inline] dev_hard_start_xmit+0x16b/0xc10 net/core/dev.c:3068 sch_direct_xmit+0x4de/0x11e0 net/sched/sch_generic.c:327 qdisc_restart net/sched/sch_generic.c:393 [inline] __qdisc_run+0x611/0x19e0 net/sched/sch_generic.c:401 qdisc_run include/net/pkt_sched.h:118 [inline] __dev_xmit_skb net/core/dev.c:3247 [inline] __dev_queue_xmit+0x1417/0x3900 net/core/dev.c:3555 dev_queue_xmit+0x17/0x20 net/core/dev.c:3620 neigh_hh_output include/net/neighbour.h:473 [inline] neigh_output include/net/neighbour.h:481 [inline] ip_finish_output2+0x1046/0x1840 net/ipv4/ip_output.c:229 ip_finish_output+0x828/0xf80 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:276 [inline] ip_output+0x21b/0x850 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124 ip_queue_xmit+0x9d7/0x1f70 net/ipv4/ip_output.c:504 tcp_transmit_skb+0x1bea/0x3ec0 net/ipv4/tcp_output.c:1168 tcp_send_ack+0x4a1/0x690 net/ipv4/tcp_output.c:3611 tcp_cleanup_rbuf+0x409/0x730 net/ipv4/tcp.c:1589 tcp_recvmsg+0xae7/0x34a0 net/ipv4/tcp.c:2155 inet_recvmsg+0x179/0x6b0 net/ipv4/af_inet.c:830 sock_recvmsg_nosec net/socket.c:802 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:809 sock_read_iter+0x381/0x550 net/socket.c:886 call_read_iter include/linux/fs.h:1778 [inline] new_sync_read fs/read_write.c:406 [inline] __vfs_read+0x696/0xa50 fs/read_write.c:418 vfs_read+0x17f/0x3d0 fs/read_write.c:452 ksys_read+0xf9/0x250 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 4528: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 kfree_skbmem+0x13c/0x210 net/core/skbuff.c:582 __kfree_skb net/core/skbuff.c:642 [inline] kfree_skb+0x19d/0x560 net/core/skbuff.c:659 packet_rcv_spkt+0x126/0x730 net/packet/af_packet.c:1847 dev_queue_xmit_nit+0x90c/0xc50 net/core/dev.c:2019 xmit_one net/core/dev.c:3048 [inline] dev_hard_start_xmit+0x16b/0xc10 net/core/dev.c:3068 sch_direct_xmit+0x4de/0x11e0 net/sched/sch_generic.c:327 qdisc_restart net/sched/sch_generic.c:393 [inline] __qdisc_run+0x611/0x19e0 net/sched/sch_generic.c:401 qdisc_run include/net/pkt_sched.h:118 [inline] __dev_xmit_skb net/core/dev.c:3247 [inline] __dev_queue_xmit+0x1417/0x3900 net/core/dev.c:3555 dev_queue_xmit+0x17/0x20 net/core/dev.c:3620 neigh_hh_output include/net/neighbour.h:473 [inline] neigh_output include/net/neighbour.h:481 [inline] ip_finish_output2+0x1046/0x1840 net/ipv4/ip_output.c:229 ip_finish_output+0x828/0xf80 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:276 [inline] ip_output+0x21b/0x850 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124 ip_queue_xmit+0x9d7/0x1f70 net/ipv4/ip_output.c:504 tcp_transmit_skb+0x1bea/0x3ec0 net/ipv4/tcp_output.c:1168 tcp_send_ack+0x4a1/0x690 net/ipv4/tcp_output.c:3611 tcp_cleanup_rbuf+0x409/0x730 net/ipv4/tcp.c:1589 tcp_recvmsg+0xae7/0x34a0 net/ipv4/tcp.c:2155 inet_recvmsg+0x179/0x6b0 net/ipv4/af_inet.c:830 sock_recvmsg_nosec net/socket.c:802 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:809 sock_read_iter+0x381/0x550 net/socket.c:886 call_read_iter include/linux/fs.h:1778 [inline] new_sync_read fs/read_write.c:406 [inline] __vfs_read+0x696/0xa50 fs/read_write.c:418 vfs_read+0x17f/0x3d0 fs/read_write.c:452 ksys_read+0xf9/0x250 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801acfbd080 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 99 bytes to the left of 232-byte region [ffff8801acfbd080, ffff8801acfbd168) The buggy address belongs to the page: page:ffffea0006b3ef40 count:1 mapcount:0 mapping:ffff8801acfbd080 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801acfbd080 0000000000000000 000000010000000c raw: ffffea0006b20d20 ffffea000766d960 ffff8801d9bdd6c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801acfbcf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801acfbcf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801acfbd000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801acfbd080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801acfbd100: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ==================================================================