add helper tool to cause a segfault for testing purposes.

`segfault-build` creates `segfault-run`. Running `segfault-run` results in
`segfault-run` terminating with a segfault. This is useful to test if
coredump files are being generated when an application crashes.

    sudo segfault-build

> /usr/sbin/segfault-build: SUCCESS. You can now run:
> segfault-run

    segfault-run

> Segmentation fault (core dumped)

    echo $?

> 139

auto-generated-man-pages/segfault-build.8

@@ -0,0 +1,16 @@
+.\" generated with Ronn-NG/v0.8.0
+.\" http://github.com/apjanke/ronn-ng/tree/0.8.0
+.TH "SEGFAULT\-BUILD" "8" "January 2020" "debug-misc" "debug-misc Manual"
+.SH "NAME"
+\fBsegfault\-build\fR \- create segfault\-run program
+.P
+.SH "SYNOPSIS"
+segfault\-build
+.SH "DESCRIPTION"
+Creates \fBsegfault\-run\fR\.
+.SH "RETURN VALUES"
+0 success\.
+.P
+Non\-zero otherwise\.
+.SH "AUTHOR"
+This man page has been written by Patrick Schleizer (adrelanos@riseup\.net)\.

debian/control

@@ -47,6 +47,13 @@ Description: Enables miscellaneous debug settings
  passwords. Package `security-misc` disables coredumps. Package `debug-misc`
  re-enables coredumps.
  .
+ Contains a helper tool to cause a segfault for testing purposes.
+ `segfault-build` creates `segfault-run`. Running `segfault-run` results in
+ `segfault-run` terminating with a segfault. This is useful to test if
+ coredump files are being generated when an application crashes.
+ `/usr/sbin/segfault-build`
+ `/usr/share/debug-misc/segfault.c`
+ .
  For better usability, to ease debugging in case of issues.
  .
  For better security, this package should only be installed on specific

debian/rules

@@ -8,5 +8,8 @@
 %:
 	dh $@ --with=config-package
 
+override_dh_installman:
+	dh_installman $(CURDIR)/auto-generated-man-pages/*
+
 override_dh_installchangelogs:
 	dh_installchangelogs changelog.upstream upstream

man/segfault-build.8.ronn

@@ -0,0 +1,25 @@
+segfault-build(8) -- create segfault-run program
+=============================================
+
+<span class="comment">
+# Copyright (C) 2012 - 2020 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
+# See the file COPYING for copying conditions.
+</span>
+
+## SYNOPSIS
+
+segfault-build
+
+## DESCRIPTION
+
+Creates `segfault-run`.
+
+## RETURN VALUES
+
+0 success.
+
+Non-zero otherwise.
+
+## AUTHOR
+
+This man page has been written by Patrick Schleizer (adrelanos@riseup.net).

usr/sbin/segfault-build

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+## Copyright (C) 2020 - 2020 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
+## See the file COPYING for copying conditions.
+
+if [ ! "$(id -u)" = "0" ]; then
+   echo "$0: ERROR: Needs to run as root. Run:
+sudo $0" >&2
+   exit 1
+fi
+
+if ! type -P gcc >/dev/null ; then
+   echo "$0: ERROR: gcc not installed. To install:
+
+   sudo apt update
+
+sudo apt --no-install-recommends install gcc" >&2
+   exit 1
+fi
+
+gcc /usr/share/debug-misc/segfault.c -g -o /usr/bin/segfault-run
+
+echo "$0: SUCCESS. You can now run:"
+echo "segfault-run"

usr/share/debug-misc/segfault.c

@@ -0,0 +1,5 @@
+int main(void)
+{
+    char *s = "hello world";
+    *s = 'H';
+}