sanity checks on size arg to mmap.

2 files changed, 49 insertions, 0 deletions

diff --git a/regress/sys/uvm/mmap_size/Makefile b/regress/sys/uvm/mmap_size/Makefile
new file mode 100644
index 00000000000..2c5d809d386
--- /dev/null
+++ b/regress/sys/uvm/mmap_size/Makefile
@@ -0,0 +1,4 @@
+#	$OpenBSD: Makefile,v 1.1 2005/01/06 10:14:20 otto Exp $
+PROG=mmap_size
+
+.include <bsd.regress.mk>
diff --git a/regress/sys/uvm/mmap_size/mmap_size.c b/regress/sys/uvm/mmap_size/mmap_size.c
new file mode 100644
index 00000000000..5bd9b0980f2
--- /dev/null
+++ b/regress/sys/uvm/mmap_size/mmap_size.c
@@ -0,0 +1,45 @@
+/*	$OpenBSD: mmap_size.c,v 1.1 2005/01/06 10:14:20 otto Exp $	*/
+
+/*
+ * Public domain. 2005, Otto Moerbeek <otto@drijf.net>
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <err.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+void
+f(size_t sz)
+{
+	char *p;
+	p = mmap(NULL, sz, PROT_READ|PROT_WRITE,
+                    MAP_ANON|MAP_PRIVATE, -1, (off_t)0);	
+
+	if (p == MAP_FAILED)
+		return;
+
+	if (sz > 0) {
+		p[0] = 0;
+		p[sz / 2] = 0;
+		p[sz - 1] = 0;
+	}
+	munmap(p, sz);
+}
+
+int
+main()
+{
+	size_t i;
+
+	for (i = 0; i < 0x2000; i += 0x100) {
+		f(i);
+		f(-i);
+		f(SIZE_T_MAX/2 - 0x1000);
+	}	
+	return (0);
+}
+
+