test: add a regression test for a bug in our mmap function.

.gitignore

@@ -39,6 +39,7 @@ test/zznop
 test/zzone
 test/bug-div0
 test/bug-memory
+test/bug-mmap
 test/bug-overflow
 # Test suite temporary files
 test/*.log

test/Makefile.am

@@ -1,14 +1,28 @@
 
-EXTRA_DIST = $(TESTS) functions.inc file-00 file-ff file-random file-text
+EXTRA_DIST = $(TESTS) \
+             functions.inc \
+             file-00 \
+             file-ff \
+             file-random \
+             file-text
 
-noinst_PROGRAMS = zzero zznop zzone bug-overflow bug-memory bug-div0
+noinst_PROGRAMS = zzero zznop zzone \
+                  bug-overflow \
+                  bug-memory \
+                  bug-div0 \
+                  bug-mmap
 
 TESTS = check-zzuf-A-autoinc \
         check-zzuf-f-fuzzing \
         check-zzuf-m-md5 \
         check-zzuf-M-max-memory \
         check-zzuf-r-ratio \
-        check-source check-win32 check-overflow check-div0 check-utils
+        check-source \
+        check-win32 \
+        check-overflow \
+        check-div0 \
+        check-utils \
+        check-mmap
 
 echo-sources: ; echo $(SOURCES)
 

test/bug-mmap.c

@@ -0,0 +1,43 @@
+/*
+ *  bug-mmap - regression test for a bug in zzuf
+ *
+ *  Copyright © 2002—2015 Sam Hocevar <sam@hocevar.net>
+ *            © 2015 Alexander Cherepanov <cherepan@mccme.ru>
+ *
+ *  This program is free software. It comes without any warranty, to
+ *  the extent permitted by applicable law. You can redistribute it
+ *  and/or modify it under the terms of the Do What the Fuck You Want
+ *  to Public License, Version 2, as published by the WTFPL Task Force.
+ *  See http://www.wtfpl.net/ for more details.
+ */
+
+#include "config.h"
+
+#define _BSD_SOURCE 1 /* for MAP_POPULATE */
+
+#if HAVE_SYS_MMAN_H
+#   include <sys/mman.h>
+#endif
+#if HAVE_SYS_TYPES_H
+#   include <sys/types.h>
+#endif
+#if HAVE_SYS_STAT_H
+#   include <sys/stat.h>
+#endif
+#if HAVE_UNISTD_H
+#   include <unistd.h>
+#endif
+#include <fcntl.h>
+#include <stdlib.h>
+
+int main(void)
+{
+#if defined _SC_PAGE_SIZE
+    int fd = open("/etc/hosts", O_RDONLY);
+    mmap(0, sysconf(_SC_PAGE_SIZE) * 2, PROT_READ,
+         MAP_PRIVATE | MAP_POPULATE, fd, 0);
+#endif
+
+    return EXIT_SUCCESS;
+}
+

test/check-mmap

@@ -0,0 +1,41 @@
+#!/bin/sh
+#
+#  check-mmap - check that zzuf handles mmap() properly
+#
+#  Copyright © 2002—2015 Sam Hocevar <sam@hocevar.net>
+#
+#  This program is free software. It comes without any warranty, to
+#  the extent permitted by applicable law. You can redistribute it
+#  and/or modify it under the terms of the Do What the Fuck You Want
+#  to Public License, Version 2, as published by the WTFPL Task Force.
+#  See http://www.wtfpl.net/ for more details.
+#
+
+. "$(dirname "$0")/functions.inc"
+
+ulimit -c 0
+
+PROGRAM="$DIR/bug-mmap"
+if [ ! -f "$PROGRAM" ]; then
+  echo "error: test/bug-mmap is missing"
+  exit 1
+fi
+
+start_test "zzuf buffer overflow test"
+
+new_test "bug-mmap"
+if ! $PROGRAM; then
+    fail_test " unexpected exit status $?"
+else
+    pass_test " OK"
+fi
+
+new_test "zzuf -qi -r0 bug-mmap"
+if ! $ZZUF -r0 -qi "$PROGRAM"; then
+    fail_test " unexpected exit status $?"
+else
+    pass_test " OK"
+fi
+
+stop_test
+