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BUG: KMSAN: kernel-infoleak in _copy_to_user+0x15d/0x1f0 lib/usercopy.c:31
CPU: 0 PID: 5960 Comm: syz-executor5 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: 0033:0x4572d9
Code: fd b4 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 b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd106967c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000065
RAX: ffffffffffffffda RBX: 00007fd1069686d4 RCX: 00000000004572d9
RDX: 0000000020000004 RSI: 0000000000000001 RDI: 0000000000004209
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000100 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d4478 R14: 00000000004c8d0b 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 ffff88014401fca0
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