[newlib-cygwin] upstream OpenBSD: arc4random: replace abort() with _exit()

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=db5e07368c10fb6c362343d94775ab0a3248d0e7

commit db5e07368c10fb6c362343d94775ab0a3248d0e7
Author: deraadt <deraadt@openbsd.org>
Date:   Sun Mar 24 17:56:54 2019 +0000

    upstream OpenBSD: arc4random: replace abort() with _exit()
    
    In the incredibly unbelievable circumstance where _rs_init() fails to
    allocate pages, don't call abort() because of corefile data leakage
    concerns, but simply _exit(). The reasoning is _rs_init() will only fail
    if someone finds a way to apply specific pressure against this failure
    point, for the purpose of leaking information into a core which they can
    read. We don't need a corefile in this instance to debug that. So take
    this "lever" away from whoever in the future wants to do that.

Diff:
---
 newlib/libc/stdlib/arc4random.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/newlib/libc/stdlib/arc4random.c b/newlib/libc/stdlib/arc4random.c
index 4f6dccd3c..8bb7a6671 100644
--- a/newlib/libc/stdlib/arc4random.c
+++ b/newlib/libc/stdlib/arc4random.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random.c,v 1.54 2015/09/13 08:31:47 guenther Exp $	*/
+/*	$OpenBSD: arc4random.c,v 1.55 2019/03/24 17:56:54 deraadt Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -75,7 +75,7 @@ _rs_init(u_char *buf, size_t n)
 
 	if (rs == NULL) {
 		if (_rs_allocate(&rs, &rsx) == -1)
-			abort();
+			_exit(1);
 	}
 
 	chacha_keysetup(&rsx->rs_chacha, buf, KEYSZ * 8, 0);