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BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:140 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x1ba8/0x2900 lib/iov_iter.c:571
CPU: 0 PID: 13198 Comm: syz-executor1 Not tainted 4.18.0-rc5+ #29
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+0x1ba8/0x2900 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+0x10a/0x140 net/socket.c:814
 ___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:00007fc5ff6fac68 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fc5ff6fb6d4 RCX: 0000000000455ab9
RDX: 0000000000000003 RSI: 0000000020002f40 RDI: 0000000000000015
RBP: 000000000072bea0 R08: 0000000020003040 R09: 0000000000000000
R10: 0000000000000100 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]
 build_acquire net/xfrm/xfrm_user.c:2850 [inline]
 xfrm_send_acquire+0x10a9/0x16e0 net/xfrm/xfrm_user.c:2873
 km_query net/xfrm/xfrm_state.c:1954 [inline]
 xfrm_state_find+0x3cb9/0x5200 net/xfrm/xfrm_state.c:1022
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1393 [inline]
 xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:1437 [inline]
 xfrm_resolve_and_create_bundle+0xc06/0x5270 net/xfrm/xfrm_policy.c:1832
 xfrm_lookup+0x647/0x3aa0 net/xfrm/xfrm_policy.c:2162
 xfrm_lookup_route+0xfa/0x360 net/xfrm/xfrm_policy.c:2282
 ip6_dst_lookup_flow+0x22e/0x290 net/ipv6/ip6_output.c:1083
 rawv6_sendmsg+0x1c38/0x5410 net/ipv6/raw.c:908
 inet_sendmsg+0x3fc/0x760 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:641 [inline]
 sock_sendmsg net/socket.c:651 [inline]
 sock_write_iter+0x408/0x4d0 net/socket.c:920
 call_write_iter include/linux/fs.h:1793 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x87e/0xb90 fs/read_write.c:487
 vfs_write+0x467/0x8c0 fs/read_write.c:549
 ksys_write fs/read_write.c:598 [inline]
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x1cf/0x400 fs/read_write.c:607
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Local variable description: ----upt.i.i@xfrm_send_acquire
Variable was created at:
 xfrm_send_acquire+0x80/0x16e0 net/xfrm/xfrm_user.c:2864
 km_query net/xfrm/xfrm_state.c:1954 [inline]
 xfrm_state_find+0x3cb9/0x5200 net/xfrm/xfrm_state.c:1022

Byte 231 of 238 is uninitialized
Memory access starts at ffff88011cf6188a
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