================================================================== BUG: KMSAN: kernel-infoleak in _copy_to_user+0x15d/0x1f0 lib/usercopy.c:31 CPU: 0 PID: 4398 Comm: syz-executor001 Not tainted 4.19.0-rc3+ #45 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+0x14b/0x190 lib/dump_stack.c:113 kmsan_report+0x183/0x2b0 mm/kmsan/kmsan.c:956 kmsan_internal_check_memory+0xfe/0x1f0 mm/kmsan/kmsan.c:1014 kmsan_copy_to_user+0x73/0xb0 mm/kmsan/kmsan_hooks.c:479 _copy_to_user+0x15d/0x1f0 lib/usercopy.c:31 copy_to_user include/linux/uaccess.h:183 [inline] copy_siginfo_to_user+0x81/0x130 kernel/signal.c:2897 ptrace_peek_siginfo kernel/ptrace.c:741 [inline] ptrace_request+0x2278/0x2680 kernel/ptrace.c:912 arch_ptrace+0xbdd/0x11a0 arch/x86/kernel/ptrace.c:877 __do_sys_ptrace kernel/ptrace.c:1145 [inline] __se_sys_ptrace+0x2a2/0x7e0 kernel/ptrace.c:1110 __x64_sys_ptrace+0x56/0x70 kernel/ptrace.c:1110 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x440df9 Code: e8 cc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffe8af43578 EFLAGS: 00000286 ORIG_RAX: 0000000000000065 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440df9 RDX: 0000000020000004 RSI: 0000000000000001 RDI: 0000000000004209 RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000000020000100 R11: 0000000000000286 R12: 000000000000b922 R13: 0000000000401dd0 R14: 0000000000000000 R15: 0000000000000000 Local variable description: ----kiov@ptrace_request Variable was created at: ptrace_request+0x19f/0x2680 kernel/ptrace.c:885 arch_ptrace+0xbdd/0x11a0 arch/x86/kernel/ptrace.c:877 Bytes 0-15 of 128 are uninitialized Memory access starts at ffff8801b751fca0 ==================================================================