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BUG: KMSAN: kernel-infoleak in copy_to_user include/linux/uaccess.h:184 [inline]
BUG: KMSAN: kernel-infoleak in copy_siginfo_to_user+0xf0/0x150 kernel/signal.c:2854
CPU: 1 PID: 29514 Comm: syz-executor3 Not tainted 4.18.0-rc4+ #23
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+0x185/0x1e0 lib/dump_stack.c:113
 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:990
 kmsan_internal_check_memory+0x10e/0x210 mm/kmsan/kmsan.c:1048
 kmsan_copy_to_user+0x83/0xe0 mm/kmsan/kmsan_hooks.c:479
 copy_to_user include/linux/uaccess.h:184 [inline]
 copy_siginfo_to_user+0xf0/0x150 kernel/signal.c:2854
 ptrace_peek_siginfo kernel/ptrace.c:741 [inline]
 ptrace_request+0x232d/0x2790 kernel/ptrace.c:912
 arch_ptrace+0xbcc/0x12c0 arch/x86/kernel/ptrace.c:877
 __do_sys_ptrace kernel/ptrace.c:1145 [inline]
 __se_sys_ptrace+0x2f0/0x850 kernel/ptrace.c:1110
 __x64_sys_ptrace+0x11e/0x170 kernel/ptrace.c:1110
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455e29
Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
Unknown ioctl 8707
RSP: 002b:00007f629b710c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000065
RAX: ffffffffffffffda RBX: 00007f629b7116d4 RCX: 0000000000455e29
RDX: 0000000020000004 RSI: 0000000000000001 RDI: 0000000000004209
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000100 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c0db7 R14: 00000000004d0ec8 R15: 0000000000000000

Local variable description: ----kiov@ptrace_request
Variable was created at:
 ptrace_request+0x1bf/0x2790 kernel/ptrace.c:885
 arch_ptrace+0xbcc/0x12c0 arch/x86/kernel/ptrace.c:877

Bytes 0-15 of 128 are uninitialized
Memory access starts at ffff88012b84fca8
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