4 files changed, 163 insertions, 0 deletions
diff --git a/lib/libc/secure/Makefile.inc b/lib/libc/secure/Makefile.inc
new file mode 100644
index 0000000..6f18bde
--- /dev/null
+++ b/lib/libc/secure/Makefile.inc
@@ -0,0 +1,12 @@
+# $FreeBSD$
+#
+# libc sources related to security
+
+.PATH: ${LIBC_SRCTOP}/secure
+
+# Sources common to both syscall interfaces:
+SRCS+=	\
+	stack_protector.c \
+	stack_protector_compat.c
+
+SYM_MAPS+=    ${LIBC_SRCTOP}/secure/Symbol.map
diff --git a/lib/libc/secure/Symbol.map b/lib/libc/secure/Symbol.map
new file mode 100644
index 0000000..11bad3a
--- /dev/null
+++ b/lib/libc/secure/Symbol.map
@@ -0,0 +1,14 @@
+/*
+ * $FreeBSD$
+ */
+
+/*
+ * It'd be nice to have this automatically generated, but we don't
+ * know to what version they will eventually belong, so for now
+ * it has to be manual.
+ */
+FBSD_1.0 {
+	__chk_fail;
+	__stack_chk_fail;
+	__stack_chk_guard;
+};
diff --git a/lib/libc/secure/stack_protector.c b/lib/libc/secure/stack_protector.c
new file mode 100644
index 0000000..cd5f166
--- /dev/null
+++ b/lib/libc/secure/stack_protector.c
@@ -0,0 +1,117 @@
+/* $NetBSD: stack_protector.c,v 1.4 2006/11/22 17:23:25 christos Exp $	*/
+/* $OpenBSD: stack_protector.c,v 1.10 2006/03/31 05:34:44 deraadt Exp $	*/
+/*
+ * Copyright (c) 2002 Hiroaki Etoh, Federico G. Schwindt, and Miodrag Vallat.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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 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/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <link.h>
+#include <signal.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+extern int __sysctl(const int *name, u_int namelen, void *oldp,
+    size_t *oldlenp, void *newp, size_t newlen);
+
+long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0};
+static void __guard_setup(void) __attribute__((__constructor__, __used__));
+static void __fail(const char *);
+void __stack_chk_fail(void);
+void __chk_fail(void);
+
+/*LINTED used*/
+static void
+__guard_setup(void)
+{
+	static const int mib[2] = { CTL_KERN, KERN_ARND };
+	size_t len;
+	int error;
+
+	if (__stack_chk_guard[0] != 0)
+		return;
+	error = _elf_aux_info(AT_CANARY, __stack_chk_guard,
+	    sizeof(__stack_chk_guard));
+	if (error == 0 && __stack_chk_guard[0] != 0)
+		return;
+
+	len = sizeof(__stack_chk_guard);
+	if (__sysctl(mib, nitems(mib), __stack_chk_guard, &len, NULL, 0) ==
+	    -1 || len != sizeof(__stack_chk_guard)) {
+		/* If sysctl was unsuccessful, use the "terminator canary". */
+		((unsigned char *)(void *)__stack_chk_guard)[0] = 0;
+		((unsigned char *)(void *)__stack_chk_guard)[1] = 0;
+		((unsigned char *)(void *)__stack_chk_guard)[2] = '\n';
+		((unsigned char *)(void *)__stack_chk_guard)[3] = 255;
+	}
+}
+
+/*ARGSUSED*/
+static void
+__fail(const char *msg)
+{
+	struct sigaction sa;
+	sigset_t mask;
+
+	/* Immediately block all signal handlers from running code */
+	(void)sigfillset(&mask);
+	(void)sigdelset(&mask, SIGABRT);
+	(void)sigprocmask(SIG_BLOCK, &mask, NULL);
+
+	/* This may fail on a chroot jail... */
+	syslog(LOG_CRIT, "%s", msg);
+
+	(void)memset(&sa, 0, sizeof(sa));
+	(void)sigemptyset(&sa.sa_mask);
+	sa.sa_flags = 0;
+	sa.sa_handler = SIG_DFL;
+	(void)sigaction(SIGABRT, &sa, NULL);
+	(void)kill(getpid(), SIGABRT);
+	_exit(127);
+}
+
+void
+__stack_chk_fail(void)
+{
+	__fail("stack overflow detected; terminated");
+}
+
+void
+__chk_fail(void)
+{
+	__fail("buffer overflow detected; terminated");
+}
+
+#ifndef PIC
+__weak_reference(__stack_chk_fail, __stack_chk_fail_local);
+#endif
diff --git a/lib/libc/secure/stack_protector_compat.c b/lib/libc/secure/stack_protector_compat.c
new file mode 100644
index 0000000..cacb863
--- /dev/null
+++ b/lib/libc/secure/stack_protector_compat.c
@@ -0,0 +1,20 @@
+/*
+ * Written by Alexander Kabaev <kan@FreeBSD.org>
+ * The file is in public domain.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+void __stack_chk_fail(void);
+
+#ifdef PIC
+void
+__stack_chk_fail_local_hidden(void)
+{
+
+	__stack_chk_fail();
+}
+
+__sym_compat(__stack_chk_fail_local, __stack_chk_fail_local_hidden, FBSD_1.0);
+#endif