===================================================== BUG: KMSAN: kernel-infoleak in kmsan_copy_to_user+0x9c/0xb0 mm/kmsan/kmsan_hooks.c:251 CPU: 1 PID: 20323 Comm: syz-executor.1 Tainted: G W 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x24c/0x2e0 lib/dump_stack.c:120 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:121 kmsan_internal_check_memory+0x469/0x500 mm/kmsan/kmsan.c:433 kmsan_copy_to_user+0x9c/0xb0 mm/kmsan/kmsan_hooks.c:251 instrument_copy_to_user include/linux/instrumented.h:121 [inline] copyout lib/iov_iter.c:189 [inline] _copy_to_iter+0x6b2/0x3da0 lib/iov_iter.c:661 copy_to_iter include/linux/uio.h:145 [inline] simple_copy_to_iter+0xf6/0x150 net/core/datagram.c:519 __skb_datagram_iter+0x2cb/0x1210 net/core/datagram.c:425 skb_copy_datagram_iter+0xd8/0x200 net/core/datagram.c:533 skb_copy_datagram_msg include/linux/skbuff.h:3602 [inline] packet_recvmsg+0x764/0x2060 net/packet/af_packet.c:3417 sock_recvmsg_nosec net/socket.c:888 [inline] sock_recvmsg net/socket.c:906 [inline] sock_read_iter+0x59a/0x620 net/socket.c:979 do_iter_readv_writev+0xa99/0xc30 include/linux/fs.h:2108 do_iter_read+0x396/0x1100 fs/read_write.c:801 vfs_readv fs/read_write.c:921 [inline] do_readv+0x41a/0x7e0 fs/read_write.c:958 __do_sys_readv fs/read_write.c:1049 [inline] __se_sys_readv+0x9b/0xb0 fs/read_write.c:1046 __x64_sys_readv+0x4a/0x70 fs/read_write.c:1046 do_syscall_64+0xb3/0x180 arch/x86/entry/common.c:53 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbec78b6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000001 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 0000000000a9fb1f R14: 00007fbec78b6300 R15: 0000000000022000 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:120 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:288 kmsan_memcpy_memmove_metadata+0x25e/0x2d0 mm/kmsan/kmsan.c:225 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:245 __msan_memcpy+0x46/0x60 mm/kmsan/kmsan_instr.c:110 skb_copy_from_linear_data include/linux/skbuff.h:3723 [inline] __pskb_copy_fclone+0x530/0x1920 net/core/skbuff.c:1614 __pskb_copy include/linux/skbuff.h:1171 [inline] pskb_copy include/linux/skbuff.h:3194 [inline] tipc_clone_to_loopback+0x1a8/0x980 net/tipc/bearer.c:754 tipc_loopback_trace net/tipc/bearer.h:253 [inline] tipc_topsrv_kern_evt net/tipc/topsrv.c:615 [inline] tipc_conn_send_to_sock net/tipc/topsrv.c:283 [inline] tipc_conn_send_work+0xf24/0x1030 net/tipc/topsrv.c:303 process_one_work+0x1219/0x1fe0 kernel/workqueue.c:2276 worker_thread+0x10ec/0x2340 kernel/workqueue.c:2422 kthread+0x521/0x560 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:120 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:288 kmsan_memcpy_memmove_metadata+0x25e/0x2d0 mm/kmsan/kmsan.c:225 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:245 __msan_memcpy+0x46/0x60 mm/kmsan/kmsan_instr.c:110 tipc_topsrv_kern_evt net/tipc/topsrv.c:612 [inline] tipc_conn_send_to_sock net/tipc/topsrv.c:283 [inline] tipc_conn_send_work+0x824/0x1030 net/tipc/topsrv.c:303 process_one_work+0x1219/0x1fe0 kernel/workqueue.c:2276 worker_thread+0x10ec/0x2340 kernel/workqueue.c:2422 kthread+0x521/0x560 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:120 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:288 kmsan_memcpy_memmove_metadata+0x25e/0x2d0 mm/kmsan/kmsan.c:225 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:245 __msan_memcpy+0x46/0x60 mm/kmsan/kmsan_instr.c:110 tipc_topsrv_queue_evt+0x3af/0x770 net/tipc/topsrv.c:329 tipc_sub_send_event net/tipc/subscr.c:63 [inline] tipc_sub_report_overlap+0xa60/0xc30 net/tipc/subscr.c:102 tipc_service_insert_publ net/tipc/name_table.c:366 [inline] tipc_nametbl_insert_publ+0x22cc/0x2580 net/tipc/name_table.c:491 tipc_nametbl_publish+0x268/0x570 net/tipc/name_table.c:776 tipc_sk_publish net/tipc/socket.c:2906 [inline] tipc_sk_join net/tipc/socket.c:3084 [inline] tipc_setsockopt+0x253a/0x29e0 net/tipc/socket.c:3191 __sys_setsockopt+0x94c/0xd80 net/socket.c:2104 __do_sys_setsockopt net/socket.c:2115 [inline] __se_sys_setsockopt+0xdd/0x100 net/socket.c:2112 __x64_sys_setsockopt+0x62/0x80 net/socket.c:2112 do_syscall_64+0xb3/0x180 arch/x86/entry/common.c:53 entry_SYSCALL_64_after_hwframe+0x44/0xae Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:120 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:288 kmsan_memcpy_memmove_metadata+0x25e/0x2d0 mm/kmsan/kmsan.c:225 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:245 __msan_memcpy+0x46/0x60 mm/kmsan/kmsan_instr.c:110 tipc_sub_subscribe+0x49d/0xc80 net/tipc/subscr.c:156 tipc_conn_rcv_sub+0x2b9/0x7b0 net/tipc/topsrv.c:375 tipc_topsrv_kern_subscr+0x455/0x570 net/tipc/topsrv.c:579 tipc_group_create+0x663/0x9b0 net/tipc/group.c:190 tipc_sk_join net/tipc/socket.c:3074 [inline] tipc_setsockopt+0x1a94/0x29e0 net/tipc/socket.c:3191 __sys_setsockopt+0x94c/0xd80 net/socket.c:2104 __do_sys_setsockopt net/socket.c:2115 [inline] __se_sys_setsockopt+0xdd/0x100 net/socket.c:2112 __x64_sys_setsockopt+0x62/0x80 net/socket.c:2112 do_syscall_64+0xb3/0x180 arch/x86/entry/common.c:53 entry_SYSCALL_64_after_hwframe+0x44/0xae Local variable ----sub@tipc_topsrv_kern_subscr created at: tipc_topsrv_kern_subscr+0xe5/0x570 net/tipc/topsrv.c:562 tipc_topsrv_kern_subscr+0xe5/0x570 net/tipc/topsrv.c:562 Bytes 98-101 of 102 are uninitialized Memory access of size 102 starts at ffff888166e1e8c2 Data copied to user address 000000002000010a =====================================================