From: H.Merijn Brand <perl5@tux.freedom.nl>
Date: Tue, 22 Sep 2020 11:17:11 +0000 (+0200)
Subject: Trap SIGBUS when Configure checks for va_copy (#18148)
X-Git-Tag: v5.33.3~197
X-Git-Url: https://perl5.git.perl.org/perl5.git/commitdiff_plain/bec07c3af574f0f22a318c6273a2c4f29afc1251

Trap SIGBUS when Configure checks for va_copy (#18148)

On several systems the attempt to determine if we &quot;need va_copy() or
similar&quot; results in a SIGBUS instead of a SIGSEGV because the fault
happens pointing at an io device address.

While reviewing accounting logs during the OpenBSD system build, bluhm@
noticed a core dump and deraadt@ tracked it down.

While researching it was discovered that this is a fairly common case in
other systems as well.

Original diff by deraadt@
---

diff --git a/Configure b/Configure
index a01c409..e064b3f 100755
--- a/Configure
+++ b/Configure
@@ -21511,6 +21511,9 @@ int
 main(int ac, char **av)
 {
   signal(SIGSEGV, exit);
+#ifdef SIGBUS
+  signal(SIGBUS,  exit);
+#endif
 
   myprintf("%s%cs all right, then\n", "that", '\'');
   exit(0);