================================================================== BUG: KMSAN: uninit-value in netlink_rcv_skb+0x3d9/0x5f0 net/netlink/af_netlink.c:2444 CPU: 1 PID: 12209 Comm: syz-executor4 Not tainted 4.18.0-rc8+ #34 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+0x17c/0x1c0 lib/dump_stack.c:113 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:982 __msan_warning+0x70/0xc0 mm/kmsan/kmsan_instr.c:645 netlink_rcv_skb+0x3d9/0x5f0 net/netlink/af_netlink.c:2444 xfrm_netlink_rcv+0xb2/0xf0 net/xfrm/xfrm_user.c:2602 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x1492/0x1740 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x114c/0x1350 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:642 [inline] sock_sendmsg net/socket.c:652 [inline] kernel_sendmsg+0x22a/0x2d0 net/socket.c:660 sock_no_sendpage+0x1bd/0x250 net/core/sock.c:2643 kernel_sendpage net/socket.c:3334 [inline] sock_sendpage+0x1ef/0x2e0 net/socket.c:867 pipe_to_sendpage+0x31d/0x430 fs/splice.c:452 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x49f/0xf30 fs/splice.c:627 splice_from_pipe fs/splice.c:662 [inline] generic_splice_sendpage+0x1c2/0x2a0 fs/splice.c:833 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x19e/0x200 fs/splice.c:1019 splice_direct_to_actor+0x746/0xfb0 fs/splice.c:974 do_splice_direct+0x332/0x540 fs/splice.c:1062 do_sendfile+0x1090/0x1df0 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64+0x1c2/0x380 fs/read_write.c:1487 __x64_sys_sendfile64+0x11e/0x170 fs/read_write.c:1487 do_syscall_64+0x15b/0x220 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457089 Code: fd b4 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 b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f90d0c6ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f90d0c6f6d4 RCX: 0000000000457089 RDX: 0000000020000000 RSI: 0000000000000004 RDI: 0000000000000003 RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d3cb0 R14: 00000000004c8769 R15: 0000000000000001 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+0x128/0x210 mm/kmsan/kmsan.c:573 kmsan_memcpy_origins+0x13d/0x1b0 mm/kmsan/kmsan.c:397 __msan_memcpy+0xda/0x130 mm/kmsan/kmsan_instr.c:432 _copy_from_iter_full+0xe09/0x1450 lib/iov_iter.c:730 copy_from_iter_full include/linux/uio.h:124 [inline] memcpy_from_msg include/linux/skbuff.h:3315 [inline] netlink_sendmsg+0xef2/0x1350 net/netlink/af_netlink.c:1893 sock_sendmsg_nosec net/socket.c:642 [inline] sock_sendmsg net/socket.c:652 [inline] kernel_sendmsg+0x22a/0x2d0 net/socket.c:660 sock_no_sendpage+0x1bd/0x250 net/core/sock.c:2643 kernel_sendpage net/socket.c:3334 [inline] sock_sendpage+0x1ef/0x2e0 net/socket.c:867 pipe_to_sendpage+0x31d/0x430 fs/splice.c:452 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x49f/0xf30 fs/splice.c:627 splice_from_pipe fs/splice.c:662 [inline] generic_splice_sendpage+0x1c2/0x2a0 fs/splice.c:833 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x19e/0x200 fs/splice.c:1019 splice_direct_to_actor+0x746/0xfb0 fs/splice.c:974 do_splice_direct+0x332/0x540 fs/splice.c:1062 do_sendfile+0x1090/0x1df0 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64+0x1c2/0x380 fs/read_write.c:1487 __x64_sys_sendfile64+0x11e/0x170 fs/read_write.c:1487 do_syscall_64+0x15b/0x220 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline] kmsan_internal_alloc_meta_for_pages+0x146/0x700 mm/kmsan/kmsan.c:694 kmsan_alloc_page+0x75/0xd0 mm/kmsan/kmsan_hooks.c:250 __alloc_pages_nodemask+0xf6b/0x5c80 mm/page_alloc.c:4409 alloc_pages_current+0x6b1/0x970 mm/mempolicy.c:2093 alloc_pages include/linux/gfp.h:494 [inline] push_pipe+0x660/0xc10 lib/iov_iter.c:521 __pipe_get_pages lib/iov_iter.c:1158 [inline] pipe_get_pages lib/iov_iter.c:1192 [inline] iov_iter_get_pages+0x1378/0x1810 lib/iov_iter.c:1203 __bio_iov_iter_get_pages block/bio.c:924 [inline] bio_iov_iter_get_pages+0x1de/0xd90 block/bio.c:971 __blkdev_direct_IO_simple fs/block_dev.c:222 [inline] blkdev_direct_IO+0x1fb6/0x2c70 fs/block_dev.c:432 generic_file_read_iter+0x79a/0x4430 mm/filemap.c:2341 blkdev_read_iter+0x20d/0x270 fs/block_dev.c:1934 call_read_iter include/linux/fs.h:1787 [inline] generic_file_splice_read+0x629/0x960 fs/splice.c:308 do_splice_to fs/splice.c:881 [inline] splice_direct_to_actor+0x4af/0xfb0 fs/splice.c:953 do_splice_direct+0x332/0x540 fs/splice.c:1062 do_sendfile+0x1090/0x1df0 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64+0x1c2/0x380 fs/read_write.c:1487 __x64_sys_sendfile64+0x11e/0x170 fs/read_write.c:1487 do_syscall_64+0x15b/0x220 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ==================================================================