================================================================== 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: 0 PID: 29371 Comm: syz-executor4 Not tainted 4.20.0-rc3+ #100 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+0x32a/0xa50 mm/kmsan/kmsan.c:742 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_recvmsg net/socket.c:2327 [inline] __do_sys_recvmsg net/socket.c:2337 [inline] __se_sys_recvmsg+0x2fa/0x450 net/socket.c:2334 __x64_sys_recvmsg+0x4a/0x70 net/socket.c:2334 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:00007ff78f1b9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 0000000000000040 RSI: 0000000020001200 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff78f1ba6d4 R13: 00000000004c399f R14: 00000000004d5f38 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 __nla_put lib/nlattr.c:744 [inline] nla_put+0x20a/0x2d0 lib/nlattr.c:802 copy_to_user_state_extra+0xf9d/0x1e80 net/xfrm/xfrm_user.c:906 dump_one_state+0x33a/0x5b0 net/xfrm/xfrm_user.c:968 xfrm_state_walk+0x451/0x1340 net/xfrm/xfrm_state.c:1868 xfrm_dump_sa+0x275/0x780 net/xfrm/xfrm_user.c:1028 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] xfrm_user_rcv_msg+0x9b3/0xae0 net/xfrm/xfrm_user.c:2650 netlink_rcv_skb+0x394/0x640 net/netlink/af_netlink.c:2477 xfrm_netlink_rcv+0xb2/0xf0 net/xfrm/xfrm_user.c:2671 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] __sys_sendto+0x8d5/0xae0 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto+0x107/0x130 net/socket.c:1796 __x64_sys_sendto+0x6e/0x90 net/socket.c:1796 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:245 [inline] kmsan_internal_poison_shadow+0x6d/0x130 mm/kmsan/kmsan.c:169 kmsan_kmalloc+0xa1/0x100 mm/kmsan/kmsan_hooks.c:186 __kmalloc+0x14c/0x4d0 mm/slub.c:3816 kmalloc include/linux/slab.h:551 [inline] pfkey_msg2xfrm_state net/key/af_key.c:1219 [inline] pfkey_add+0x2c7e/0x3bd0 net/key/af_key.c:1524 pfkey_process net/key/af_key.c:2844 [inline] pfkey_sendmsg+0x166d/0x1a70 net/key/af_key.c:3683 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] ___sys_sendmsg+0xdbc/0x11d0 net/socket.c:2116 __sys_sendmmsg+0x56b/0xa90 net/socket.c:2211 __do_sys_sendmmsg net/socket.c:2240 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2237 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2237 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Bytes 216-275 of 3572 are uninitialized Memory access of size 3572 starts at ffff88810d26e024 Data copied to user address 0000000020000100 ==================================================================