================================================================== BUG: KMSAN: kernel-infoleak in _copy_to_user+0x16b/0x1f0 lib/usercopy.c:32 CPU: 0 PID: 10765 Comm: rsyslogd 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+0x189/0x4e0 mm/kmsan/kmsan.c:440 kmsan_copy_to_user+0xa9/0xb0 mm/kmsan/kmsan_hooks.c:259 _copy_to_user+0x16b/0x1f0 lib/usercopy.c:32 copy_to_user include/linux/uaccess.h:174 [inline] syslog_print kernel/printk/printk.c:1406 [inline] do_syslog+0x2e62/0x3160 kernel/printk/printk.c:1531 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+0xbc/0xf0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x7fc0730381fd 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:00007fc0705d7e30 EFLAGS: 00000293 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00000000007e74b0 RCX: 00007fc0730381fd RDX: 0000000000000fff RSI: 00007fc071e0c5a0 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00000000007d2260 R09: 0000000004000001 R10: 0000000000000001 R11: 0000000000000293 R12: 000000000065e420 R13: 00007fc0705d89c0 R14: 00007fc07367d040 R15: 0000000000000003 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:174 [inline] kmsan_internal_poison_shadow+0x58/0xb0 mm/kmsan/kmsan.c:134