test for mprotect() on the stack area: try force execable mapping on it first, and it should run a code on the stack fine; then lower the protection to non-exec and observe a sigfault. fail contraccordingly

2 files changed, 77 insertions, 0 deletions

diff --git a/regress/sys/kern/nxstack-mprotect/Makefile b/regress/sys/kern/nxstack-mprotect/Makefile
new file mode 100644
index 00000000000..29f277470d5
--- /dev/null
+++ b/regress/sys/kern/nxstack-mprotect/Makefile
@@ -0,0 +1,6 @@
+#	$OpenBSD: Makefile,v 1.1 2002/07/27 06:52:37 mickey Exp $
+
+PROG=	nxstack-mprotect
+LDSTATIC= ${STATIC}
+
+.include <bsd.regress.mk>
diff --git a/regress/sys/kern/nxstack-mprotect/nxstack-mprotect.c b/regress/sys/kern/nxstack-mprotect/nxstack-mprotect.c
new file mode 100644
index 00000000000..94ccd078624
--- /dev/null
+++ b/regress/sys/kern/nxstack-mprotect/nxstack-mprotect.c
@@ -0,0 +1,71 @@
+/*	$OpenBSD: nxstack-mprotect.c,v 1.1 2002/07/27 06:52:37 mickey Exp $	*/
+
+/*
+ * Copyright (c) 2002 Michael Shalayeff
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <stdio.h>
+#include <signal.h>
+#include <string.h>
+
+volatile sig_atomic_t fail;
+
+void
+testfly()
+{
+}
+
+void
+sigsegv(int sig)
+{
+	_exit(fail);
+}
+
+int
+main(void)
+{
+	u_int64_t buf[256];	/* assuming the testfly() will fit */
+
+	signal(SIGSEGV, sigsegv);
+	memcpy(buf, &testfly, sizeof(buf));
+
+	printf("making it execute\n");
+	/* here we must fail on segv since we said it gets executable */
+	fail = 1;
+	mprotect(buf, sizeof(buf), PROT_READ|PROT_WRITE|PROT_EXEC);
+	((void (*)(void))&buf)();
+
+	printf("making it catch a signal\n");
+	/* here we are successfull on segv and fail if it still executes */
+	fail = 0;
+	mprotect(buf, sizeof(buf), PROT_READ|PROT_WRITE);
+	((void (*)(void))&buf)();
+
+	exit(1);
+}