================================================================== BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:140 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x471/0x2640 lib/iov_iter.c:571 CPU: 0 PID: 9584 Comm: syz-executor3 Not tainted 4.19.0-rc8+ #70 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+0x306/0x460 lib/dump_stack.c:113 kmsan_report+0x1a2/0x2e0 mm/kmsan/kmsan.c:917 kmsan_internal_check_memory+0x374/0x460 mm/kmsan/kmsan.c:997 kmsan_copy_to_user+0x89/0xe0 mm/kmsan/kmsan_hooks.c:552 copyout lib/iov_iter.c:140 [inline] _copy_to_iter+0x471/0x2640 lib/iov_iter.c:571 copy_to_iter include/linux/uio.h:106 [inline] skb_copy_datagram_iter+0x4c3/0x1040 net/core/datagram.c:431 skb_copy_datagram_msg include/linux/skbuff.h:3279 [inline] tipc_recvmsg+0xd12/0x1c20 net/tipc/socket.c:1749 sock_recvmsg_nosec net/socket.c:794 [inline] sock_recvmsg net/socket.c:801 [inline] sock_read_iter+0x45a/0x4e0 net/socket.c:878 call_read_iter include/linux/fs.h:1802 [inline] new_sync_read fs/read_write.c:406 [inline] __vfs_read+0x874/0xb00 fs/read_write.c:418 vfs_read+0x36f/0x6a0 fs/read_write.c:452 ksys_read fs/read_write.c:578 [inline] __do_sys_read fs/read_write.c:588 [inline] __se_sys_read+0x183/0x370 fs/read_write.c:586 __x64_sys_read+0x4a/0x70 fs/read_write.c:586 do_syscall_64+0xbe/0x100 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:00007fa72cb75c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 000000000000fd4b RSI: 0000000020000100 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa72cb766d4 R13: 00000000004c2603 R14: 00000000004d4c80 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:255 [inline] kmsan_save_stack mm/kmsan/kmsan.c:270 [inline] kmsan_internal_chain_origin+0x136/0x240 mm/kmsan/kmsan.c:572 kmsan_memcpy_origins+0x13d/0x1b0 mm/kmsan/kmsan.c:396 __msan_memcpy+0xcf/0x150 mm/kmsan/kmsan_instr.c:286 tipc_group_create_event+0x672/0xb90 net/tipc/group.c:689 tipc_group_proto_rcv+0x26a5/0x38f0 net/tipc/group.c:769 tipc_sk_proto_rcv net/tipc/socket.c:1957 [inline] tipc_sk_filter_rcv+0x2953/0x3d20 net/tipc/socket.c:2123 tipc_sk_enqueue net/tipc/socket.c:2204 [inline] tipc_sk_rcv+0xcbe/0x2b10 net/tipc/socket.c:2248 tipc_node_xmit+0x2f1/0xa00 net/tipc/node.c:1361 tipc_node_xmit_skb net/tipc/node.c:1410 [inline] tipc_node_distr_xmit+0x40d/0x680 net/tipc/node.c:1425 tipc_sk_rcv+0x1e52/0x2b10 net/tipc/socket.c:2252 tipc_topsrv_kern_evt net/tipc/topsrv.c:618 [inline] tipc_conn_send_to_sock net/tipc/topsrv.c:291 [inline] tipc_conn_send_work+0x82e/0xe20 net/tipc/topsrv.c:311 process_one_work+0x19c4/0x24f0 kernel/workqueue.c:2153 worker_thread+0x206d/0x2b30 kernel/workqueue.c:2296 kthread+0x59c/0x5d0 kernel/kthread.c:247 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:416 Local variable description: ----evt.sroa.11@tipc_group_create_event Variable was created at: tipc_group_create_event+0xbf/0xb90 net/tipc/group.c:664 tipc_group_proto_rcv+0x26a5/0x38f0 net/tipc/group.c:769 Bytes 32-47 of 48 are uninitialized Memory access of size 48 starts at ffff88011e81d4bc ==================================================================