================================================================== 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: 1 PID: 10098 Comm: syz-executor5 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+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 net/socket.c:814 [inline] sock_recvmsg net/socket.c:821 [inline] sock_read_iter+0x45e/0x4f0 net/socket.c:898 do_iter_readv_writev+0x81a/0xac0 include/linux/fs.h:1787 do_iter_read+0x303/0xd80 fs/read_write.c:922 vfs_readv fs/read_write.c:986 [inline] do_readv+0x2aa/0x630 fs/read_write.c:1019 __do_sys_readv fs/read_write.c:1106 [inline] __se_sys_readv fs/read_write.c:1103 [inline] __x64_sys_readv+0xe1/0x120 fs/read_write.c:1103 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:00007f6827d20c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 00007f6827d216d4 RCX: 0000000000455ab9 RDX: 000000000000000a RSI: 00000000200016c0 RDI: 0000000000000015 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c094d R14: 00000000004d0df8 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 net/ipv6/ip6_output.c:1083 [inline] ip6_sk_dst_lookup_flow+0xf87/0x1240 net/ipv6/ip6_output.c:1115 udpv6_sendmsg+0x3b33/0x4870 net/ipv6/udp.c:1357 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] __sys_sendto+0x798/0x8e0 net/socket.c:1797 __do_sys_sendto net/socket.c:1809 [inline] __se_sys_sendto net/socket.c:1805 [inline] __x64_sys_sendto+0x1a1/0x210 net/socket.c:1805 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 202 of 209 is uninitialized Memory access starts at ffff8801190af8a7 ==================================================================