===================================================== BUG: KMSAN: kernel-infoleak in kmsan_copy_to_user+0xa9/0xb0 mm/kmsan/kmsan_hooks.c:253 CPU: 1 PID: 12794 Comm: rsyslogd Not tainted 5.4.0-rc3+ #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+0x14a/0x2f0 mm/kmsan/kmsan_report.c:110 kmsan_internal_check_memory+0x187/0x4e0 mm/kmsan/kmsan.c:437 kmsan_copy_to_user+0xa9/0xb0 mm/kmsan/kmsan_hooks.c:253 _copy_to_user+0x16b/0x1f0 lib/usercopy.c:33 copy_to_user include/linux/uaccess.h:174 [inline] syslog_print kernel/printk/printk.c:1404 [inline] do_syslog+0x2da5/0x3090 kernel/printk/printk.c:1529 kmsg_read+0x142/0x1a0 fs/proc/kmsg.c:40 proc_reg_read+0x25f/0x360 fs/proc/inode.c:223 __vfs_read+0x1a9/0xc90 fs/read_write.c:425 vfs_read+0x359/0x6f0 fs/read_write.c:461 ksys_read+0x265/0x430 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read+0x92/0xb0 fs/read_write.c:595 __x64_sys_read+0x4a/0x70 fs/read_write.c:595 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x7fad60a371fd Code: d1 20 00 00 75 10 b8 00 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 5e fa ff ff 48 89 04 24 b8 00 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 a7 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fad5dfd6e30 EFLAGS: 00000293 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000001748650 RCX: 00007fad60a371fd RDX: 0000000000000fff RSI: 00007fad5f80b5a0 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000001733260 R09: 0000000004000001 R10: 0000000000000001 R11: 0000000000000293 R12: 000000000065e420 R13: 00007fad5dfd79c0 R14: 00007fad6107c040 R15: 0000000000000003 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_chain_origin+0xbd/0x170 mm/kmsan/kmsan.c:319 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:254 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:274 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 msg_print_text+0x871/0xa70 kernel/printk/printk.c:1336 syslog_print kernel/printk/printk.c:1385 [inline] do_syslog+0x2998/0x3090 kernel/printk/printk.c:1529 kmsg_read+0x142/0x1a0 fs/proc/kmsg.c:40 proc_reg_read+0x25f/0x360 fs/proc/inode.c:223 __vfs_read+0x1a9/0xc90 fs/read_write.c:425 vfs_read+0x359/0x6f0 fs/read_write.c:461 ksys_read+0x265/0x430 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read+0x92/0xb0 fs/read_write.c:595 __x64_sys_read+0x4a/0x70 fs/read_write.c:595 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_chain_origin+0xbd/0x170 mm/kmsan/kmsan.c:319 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:254 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:274 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 log_store+0xe7e/0x14d0 kernel/printk/printk.c:637 log_output kernel/printk/printk.c:1899 [inline] vprintk_store+0xc0c/0x11e0 kernel/printk/printk.c:1955 vprintk_emit+0x2fd/0x8d0 kernel/printk/printk.c:1984 vprintk_default+0x90/0xa0 kernel/printk/printk.c:2029 vprintk_func+0x635/0x810 kernel/printk/printk_safe.c:386 printk+0x180/0x1c3 kernel/printk/printk.c:2062 tipc_enable_bearer net/tipc/bearer.c:339 [inline] __tipc_nl_bearer_enable+0x16f7/0x1c80 net/tipc/bearer.c:963 tipc_nl_bearer_enable+0x6c/0xb0 net/tipc/bearer.c:971 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+0xf3e/0x1020 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+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_chain_origin+0xbd/0x170 mm/kmsan/kmsan.c:319 __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:179 string_nocheck lib/vsprintf.c:609 [inline] string+0x530/0x600 lib/vsprintf.c:668 vsnprintf+0x218f/0x3210 lib/vsprintf.c:2510 vscnprintf+0xc2/0x180 lib/vsprintf.c:2613 vprintk_store+0xef/0x11e0 kernel/printk/printk.c:1921 vprintk_emit+0x2fd/0x8d0 kernel/printk/printk.c:1984 vprintk_default+0x90/0xa0 kernel/printk/printk.c:2029 vprintk_func+0x635/0x810 kernel/printk/printk_safe.c:386 printk+0x180/0x1c3 kernel/printk/printk.c:2062 tipc_enable_bearer net/tipc/bearer.c:339 [inline] __tipc_nl_bearer_enable+0x16f7/0x1c80 net/tipc/bearer.c:963 tipc_nl_bearer_enable+0x6c/0xb0 net/tipc/bearer.c:971 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+0xf3e/0x1020 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+0xb6/0x160 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:151 [inline] kmsan_internal_poison_shadow+0x60/0x110 mm/kmsan/kmsan.c:134 kmsan_slab_alloc+0xaa/0x130 mm/kmsan/kmsan_hooks.c:88 slab_alloc_node mm/slub.c:2792 [inline] __kmalloc_node_track_caller+0xda2/0x13d0 mm/slub.c:4398 __kmalloc_reserve net/core/skbuff.c:141 [inline] __alloc_skb+0x306/0xa10 net/core/skbuff.c:209 alloc_skb include/linux/skbuff.h:1050 [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+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Bytes 78-103 of 129 are uninitialized Memory access of size 129 starts at ffff8881db9d2000 Data copied to user address 00007fad5f80b5a0 =====================================================