================================================================== BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:140 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x47b/0x2900 lib/iov_iter.c:571 CPU: 1 PID: 7109 Comm: syz-executor7 Not tainted 4.18.0-rc5+ #28 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+0x185/0x1e0 lib/dump_stack.c:113 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:982 kmsan_internal_check_memory+0x148/0x210 mm/kmsan/kmsan.c:1027 kmsan_copy_to_user+0x83/0xe0 mm/kmsan/kmsan_hooks.c:479 copyout lib/iov_iter.c:140 [inline] _copy_to_iter+0x47b/0x2900 lib/iov_iter.c:571 copy_to_iter include/linux/uio.h:106 [inline] skb_copy_datagram_iter+0x41f/0xfb0 net/core/datagram.c:431 skb_copy_datagram_msg include/linux/skbuff.h:3270 [inline] netlink_recvmsg+0x743/0x19d0 net/netlink/af_netlink.c:1959 sock_recvmsg_nosec net/socket.c:814 [inline] sock_recvmsg+0x1d6/0x230 net/socket.c:821 ___sys_recvmsg+0x41e/0x850 net/socket.c:2287 __sys_recvmmsg+0x610/0xf50 net/socket.c:2399 do_sys_recvmmsg+0x2b9/0x400 net/socket.c:2480 __do_sys_recvmmsg net/socket.c:2493 [inline] __se_sys_recvmmsg net/socket.c:2489 [inline] __x64_sys_recvmmsg+0x15d/0x1c0 net/socket.c:2489 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455ab9 Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007eff78f3dc68 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007eff78f3e6d4 RCX: 0000000000455ab9 RDX: 0000000000000004 RSI: 000000002000a640 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 000000002000a740 R09: 0000000000000000 R10: 0000000000002140 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c0aed R14: 00000000004d0ed0 R15: 0000000000000000 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline] kmsan_save_stack mm/kmsan/kmsan.c:271 [inline] kmsan_internal_chain_origin+0x13c/0x240 mm/kmsan/kmsan.c:573 kmsan_memcpy_origins+0x13d/0x1b0 mm/kmsan/kmsan.c:397 __msan_memcpy+0xe7/0x150 mm/kmsan/kmsan_instr.c:432 __nla_put lib/nlattr.c:569 [inline] nla_put+0x276/0x340 lib/nlattr.c:627 copy_to_user_policy_type net/xfrm/xfrm_user.c:1678 [inline] dump_one_policy+0xc29/0x1100 net/xfrm/xfrm_user.c:1708 xfrm_policy_walk+0x45a/0xd00 net/xfrm/xfrm_policy.c:1013 xfrm_dump_policy+0x1d4/0x2d0 net/xfrm/xfrm_user.c:1749 netlink_dump+0x9b5/0x1550 net/netlink/af_netlink.c:2226 __netlink_dump_start+0x1158/0x1290 net/netlink/af_netlink.c:2323 netlink_dump_start include/linux/netlink.h:214 [inline] xfrm_user_rcv_msg+0x8b8/0x9c0 net/xfrm/xfrm_user.c:2577 netlink_rcv_skb+0x394/0x640 net/netlink/af_netlink.c:2448 xfrm_netlink_rcv+0xb2/0xf0 net/xfrm/xfrm_user.c:2598 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x16da/0x17b0 net/netlink/af_netlink.c:1336 netlink_sendmsg+0x10c4/0x13d0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:641 [inline] sock_sendmsg net/socket.c:651 [inline] ___sys_sendmsg+0xed9/0x1350 net/socket.c:2125 __sys_sendmsg net/socket.c:2163 [inline] __do_sys_sendmsg net/socket.c:2172 [inline] __se_sys_sendmsg net/socket.c:2170 [inline] __x64_sys_sendmsg+0x3b0/0x520 net/socket.c:2170 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Local variable description: ----upt.i@dump_one_policy Variable was created at: dump_one_policy+0x7f/0x1100 net/xfrm/xfrm_user.c:1689 xfrm_policy_walk+0x45a/0xd00 net/xfrm/xfrm_policy.c:1013 Byte 189 of 196 is uninitialized Memory access starts at ffff880124b5a000 ==================================================================