================================================================== 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: 21448 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 net/socket.c:814 [inline] sock_recvmsg+0x1d6/0x230 net/socket.c:821 ___sys_recvmsg+0x41e/0x850 net/socket.c:2287 __sys_recvmsg net/socket.c:2336 [inline] __do_sys_recvmsg net/socket.c:2346 [inline] __se_sys_recvmsg net/socket.c:2343 [inline] __x64_sys_recvmsg+0x3a4/0x510 net/socket.c:2343 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:00007f3d783a3c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00007f3d783a46d4 RCX: 0000000000455ab9 RDX: 0000000040000000 RSI: 0000000020000780 RDI: 0000000000000015 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c0af6 R14: 00000000004d0ee8 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 ip6_datagram_dst_update+0xa13/0xf00 net/ipv6/datagram.c:91 __ip6_datagram_connect+0x161a/0x1b70 net/ipv6/datagram.c:250 ip6_datagram_connect net/ipv6/datagram.c:273 [inline] ip6_datagram_connect_v6_only+0x102/0x180 net/ipv6/datagram.c:285 inet_dgram_connect+0x33a/0x680 net/ipv4/af_inet.c:571 __sys_connect+0x45f/0x600 net/socket.c:1673 __do_sys_connect net/socket.c:1684 [inline] __se_sys_connect net/socket.c:1681 [inline] __x64_sys_connect+0xd8/0x120 net/socket.c:1681 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 195 of 202 is uninitialized Memory access starts at ffff8801b85b84ae ==================================================================