================================================================== BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:143 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x1a85/0x2700 lib/iov_iter.c:576 CPU: 1 PID: 18727 Comm: syz-executor2 Not tainted 4.20.0-rc3+ #102 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+0x32d/0x480 lib/dump_stack.c:113 kmsan_report+0x12c/0x290 mm/kmsan/kmsan.c:682 kmsan_internal_check_memory+0x9ce/0xa50 mm/kmsan/kmsan.c:768 kmsan_copy_to_user+0x78/0xd0 mm/kmsan/kmsan_hooks.c:634 copyout lib/iov_iter.c:143 [inline] _copy_to_iter+0x1a85/0x2700 lib/iov_iter.c:576 copy_to_iter include/linux/uio.h:143 [inline] skb_copy_datagram_iter+0x4e2/0x1070 net/core/datagram.c:431 skb_copy_datagram_msg include/linux/skbuff.h:3316 [inline] netlink_recvmsg+0x6f9/0x19d0 net/netlink/af_netlink.c:1975 sock_recvmsg_nosec net/socket.c:794 [inline] sock_recvmsg+0x1d1/0x230 net/socket.c:801 ___sys_recvmsg+0x4af/0x10f0 net/socket.c:2278 __sys_recvmmsg+0x65d/0x1170 net/socket.c:2390 do_sys_recvmmsg net/socket.c:2465 [inline] __do_sys_recvmmsg net/socket.c:2482 [inline] __se_sys_recvmmsg+0x1c7/0x350 net/socket.c:2478 __x64_sys_recvmmsg+0x62/0x80 net/socket.c:2478 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcf5c6c9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457569 RDX: 0000000000000001 RSI: 00000000200005c0 RDI: 0000000000000005 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcf5c6ca6d4 R13: 00000000004c3996 R14: 00000000004d5f20 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:245 [inline] kmsan_save_stack mm/kmsan/kmsan.c:260 [inline] kmsan_internal_chain_origin+0x13d/0x240 mm/kmsan/kmsan.c:468 kmsan_memcpy_memmove_metadata+0x1a9/0xf70 mm/kmsan/kmsan.c:343 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:361 __msan_memcpy+0x61/0x70 mm/kmsan/kmsan_instr.c:148 inet_diag_msg_sctpladdrs_fill net/sctp/diag.c:104 [inline] inet_sctp_diag_fill+0x1e70/0x2680 net/sctp/diag.c:217 sctp_sock_dump+0x7bf/0xe90 net/sctp/diag.c:337 sctp_for_each_transport+0x82d/0x9a0 net/sctp/socket.c:5091 sctp_diag_dump+0x532/0x6a0 net/sctp/diag.c:527 __inet_diag_dump net/ipv4/inet_diag.c:1049 [inline] inet_diag_dump+0x3e3/0x480 net/ipv4/inet_diag.c:1065 netlink_dump+0xc79/0x1c90 net/netlink/af_netlink.c:2244 __netlink_dump_start+0x10c4/0x11d0 net/netlink/af_netlink.c:2352 netlink_dump_start include/linux/netlink.h:216 [inline] inet_diag_handler_cmd+0x74e/0x7f0 net/ipv4/inet_diag.c:1170 sock_diag_rcv_msg+0x221/0x5f0 net/core/sock_diag.c:255 netlink_rcv_skb+0x394/0x640 net/netlink/af_netlink.c:2477 sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:274 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x1699/0x1740 net/netlink/af_netlink.c:1336 netlink_sendmsg+0x13c7/0x1440 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] sock_write_iter+0x3f4/0x4f0 net/socket.c:900 do_iter_readv_writev+0x822/0xac0 include/linux/fs.h:1851 do_iter_write+0x302/0xd80 fs/read_write.c:959 vfs_writev fs/read_write.c:1004 [inline] do_writev+0x3d0/0x870 fs/read_write.c:1039 __do_sys_writev fs/read_write.c:1112 [inline] __se_sys_writev+0x9b/0xb0 fs/read_write.c:1109 __x64_sys_writev+0x4a/0x70 fs/read_write.c:1109 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:245 [inline] kmsan_save_stack mm/kmsan/kmsan.c:260 [inline] kmsan_internal_chain_origin+0x13d/0x240 mm/kmsan/kmsan.c:468 kmsan_memcpy_memmove_metadata+0x1a9/0xf70 mm/kmsan/kmsan.c:343 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:361 __msan_memcpy+0x61/0x70 mm/kmsan/kmsan_instr.c:148 sctp_add_bind_addr+0xfb/0x590 net/sctp/bind_addr.c:163 sctp_do_bind+0xc16/0xdc0 net/sctp/socket.c:428 sctp_autobind net/sctp/socket.c:8063 [inline] __sctp_connect+0x10a4/0x1c30 net/sctp/socket.c:1168 sctp_connect net/sctp/socket.c:4533 [inline] sctp_inet_connect+0x402/0x520 net/sctp/socket.c:4549 __sys_connect+0x675/0x830 net/socket.c:1664 __do_sys_connect net/socket.c:1675 [inline] __se_sys_connect+0x8d/0xb0 net/socket.c:1672 __x64_sys_connect+0x4a/0x70 net/socket.c:1672 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Local variable description: ----autoaddr.i@__sctp_connect Variable was created at: __sctp_connect+0xc2/0x1c30 net/sctp/socket.c:1071 sctp_connect net/sctp/socket.c:4533 [inline] sctp_inet_connect+0x402/0x520 net/sctp/socket.c:4549 Byte 11 of 12 is uninitialized Memory access of size 12 starts at ffff88815bfda205 Data copied to user address 0000000020000380 ==================================================================