================================================================== BUG: KMSAN: kernel-infoleak in _copy_to_user+0x16b/0x1f0 lib/usercopy.c:32 CPU: 1 PID: 22677 Comm: syz-executor.3 Not tainted 5.3.0-rc7+ #0 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+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan_report.c:109 kmsan_internal_check_memory+0x455/0x8d0 mm/kmsan/kmsan.c:524 kmsan_copy_to_user+0xa9/0xb0 mm/kmsan/kmsan_hooks.c:493 _copy_to_user+0x16b/0x1f0 lib/usercopy.c:32 copy_to_user include/linux/uaccess.h:174 [inline] syslog_print_all kernel/printk/printk.c:1474 [inline] do_syslog+0x2079/0x3160 kernel/printk/printk.c:1545 __do_sys_syslog kernel/printk/printk.c:1622 [inline] __se_sys_syslog+0x96/0xc0 kernel/printk/printk.c:1620 __x64_sys_syslog+0x4a/0x70 kernel/printk/printk.c:1620 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x4598e9 Code: fd b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4e499aec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000067 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004598e9 RDX: 37a8ec531be3c41f RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4e499af6d4 R13: 00000000004c8815 R14: 00000000004df6a8 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:189 [inline] kmsan_internal_chain_origin+0xcc/0x150 mm/kmsan/kmsan.c:347 kmsan_memcpy_memmove_metadata+0x819/0xa80 mm/kmsan/kmsan.c:280 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:300 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 msg_print_text+0x871/0xa70 kernel/printk/printk.c:1338 syslog_print_all kernel/printk/printk.c:1467 [inline] do_syslog+0x1eb6/0x3160 kernel/printk/printk.c:1545 __do_sys_syslog kernel/printk/printk.c:1622 [inline] __se_sys_syslog+0x96/0xc0 kernel/printk/printk.c:1620 __x64_sys_syslog+0x4a/0x70 kernel/printk/printk.c:1620 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:189 [inline] kmsan_internal_chain_origin+0xcc/0x150 mm/kmsan/kmsan.c:347 kmsan_memcpy_memmove_metadata+0x819/0xa80 mm/kmsan/kmsan.c:280 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:300 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 log_store+0xe7e/0x14d0 kernel/printk/printk.c:639 log_output kernel/printk/printk.c:1901 [inline] vprintk_store+0xc0c/0x11e0 kernel/printk/printk.c:1956 vprintk_emit+0x313/0x8f0 kernel/printk/printk.c:1985 vprintk_default+0x90/0xa0 kernel/printk/printk.c:2030 vprintk_func+0x635/0x810 kernel/printk/printk_safe.c:386 printk+0x180/0x1c3 kernel/printk/printk.c:2063 tipc_enable_bearer net/tipc/bearer.c:339 [inline] __tipc_nl_bearer_enable+0x16f7/0x1c80 net/tipc/bearer.c:899 tipc_nl_bearer_enable+0x6c/0xb0 net/tipc/bearer.c:907 genl_family_rcv_msg net/netlink/genetlink.c:629 [inline] genl_rcv_msg+0x16c5/0x1f20 net/netlink/genetlink.c:654 netlink_rcv_skb+0x431/0x620 net/netlink/af_netlink.c:2477 genl_rcv+0x63/0x80 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0xf6c/0x1050 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x110f/0x1330 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] ___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311 __sys_sendmsg net/socket.c:2356 [inline] __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2363 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2363 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:189 [inline] kmsan_internal_chain_origin+0xcc/0x150 mm/kmsan/kmsan.c:347 __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:190 string_nocheck lib/vsprintf.c:609 [inline] string+0x530/0x600 lib/vsprintf.c:668 vsnprintf+0x218f/0x3210 lib/vsprintf.c:2503 vscnprintf+0xc2/0x180 lib/vsprintf.c:2606 vprintk_store+0xef/0x11e0 kernel/printk/printk.c:1923 vprintk_emit+0x313/0x8f0 kernel/printk/printk.c:1985 vprintk_default+0x90/0xa0 kernel/printk/printk.c:2030 vprintk_func+0x635/0x810 kernel/printk/printk_safe.c:386 printk+0x180/0x1c3 kernel/printk/printk.c:2063 tipc_enable_bearer net/tipc/bearer.c:339 [inline] __tipc_nl_bearer_enable+0x16f7/0x1c80 net/tipc/bearer.c:899 tipc_nl_bearer_enable+0x6c/0xb0 net/tipc/bearer.c:907 genl_family_rcv_msg net/netlink/genetlink.c:629 [inline] genl_rcv_msg+0x16c5/0x1f20 net/netlink/genetlink.c:654 netlink_rcv_skb+0x431/0x620 net/netlink/af_netlink.c:2477 genl_rcv+0x63/0x80 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0xf6c/0x1050 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x110f/0x1330 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] ___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311 __sys_sendmsg net/socket.c:2356 [inline] __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2363 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2363 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:189 [inline] kmsan_internal_poison_shadow+0x58/0xb0 mm/kmsan/kmsan.c:148 kmsan_slab_alloc+0xaa/0x120 mm/kmsan/kmsan_hooks.c:175 slab_alloc_node mm/slub.c:2790 [inline] __kmalloc_node_track_caller+0xb55/0x1320 mm/slub.c:4388 __kmalloc_reserve net/core/skbuff.c:141 [inline] __alloc_skb+0x306/0xa10 net/core/skbuff.c:209 alloc_skb include/linux/skbuff.h:1056 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1174 [inline] netlink_sendmsg+0x783/0x1330 net/netlink/af_netlink.c:1892 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] ___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311 __sys_sendmsg net/socket.c:2356 [inline] __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2363 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2363 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Bytes 78-103 of 129 are uninitialized Memory access of size 129 starts at ffff88802d373000 Data copied to user address 000000002003f186 ==================================================================