ssp: add Object Size Checking for string.h

The implementation is from NetBSD, with the addition of mempcpy (a GNU
extension) for parity with glibc and libssp.

Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>

10 files changed, 533 insertions, 0 deletions

diff --git a/newlib/libc/ssp/memcpy_chk.c b/newlib/libc/ssp/memcpy_chk.c
new file mode 100644
index 000000000..63f536dc5
--- /dev/null
+++ b/newlib/libc/ssp/memcpy_chk.c
@@ -0,0 +1,54 @@
+/*	$NetBSD: memcpy_chk.c,v 1.7 2015/05/13 19:57:16 joerg Exp $	*/
+
+/*-
+ * Copyright (c) 2006 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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>
+__RCSID("$NetBSD: memcpy_chk.c,v 1.7 2015/05/13 19:57:16 joerg Exp $");
+
+/*LINTLIBRARY*/
+
+#include <ssp/ssp.h>
+#include <string.h>
+
+#undef memcpy
+
+void *__memcpy_chk(void * __restrict, const void * __restrict, size_t, size_t);
+
+void *
+__memcpy_chk(void * __restrict dst, const void * __restrict src, size_t len,
+    size_t slen)
+{
+	if (len > slen)
+		__chk_fail();
+
+	if (__ssp_overlap((const char *)src, (const char *)dst, len))
+		__chk_fail();
+
+	return memcpy(dst, src, len);
+}
diff --git a/newlib/libc/ssp/memmove_chk.c b/newlib/libc/ssp/memmove_chk.c
new file mode 100644
index 000000000..f8f03d778
--- /dev/null
+++ b/newlib/libc/ssp/memmove_chk.c
@@ -0,0 +1,50 @@
+/*	$NetBSD: memmove_chk.c,v 1.5 2014/09/17 00:39:28 joerg Exp $	*/
+
+/*-
+ * Copyright (c) 2006 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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>
+__RCSID("$NetBSD: memmove_chk.c,v 1.5 2014/09/17 00:39:28 joerg Exp $");
+
+/*LINTLIBRARY*/
+
+#include <ssp/ssp.h>
+#include <string.h>
+
+#undef memmove
+
+void *__memmove_chk(void *, void *src, size_t, size_t);
+
+void *
+__memmove_chk(void *dst, void *src, size_t len,
+    size_t slen)
+{
+	if (len > slen)
+		__chk_fail();
+	return memmove(dst, src, len);
+}
diff --git a/newlib/libc/ssp/mempcpy_chk.c b/newlib/libc/ssp/mempcpy_chk.c
new file mode 100644
index 000000000..fc2ccf894
--- /dev/null
+++ b/newlib/libc/ssp/mempcpy_chk.c
@@ -0,0 +1,21 @@
+#define _GNU_SOURCE
+#include <sys/cdefs.h>
+#include <ssp/ssp.h>
+#include <string.h>
+
+#undef mempcpy
+
+void *__mempcpy_chk(void * __restrict, const void * __restrict, size_t, size_t);
+
+void *
+__mempcpy_chk(void * __restrict dst, const void * __restrict src, size_t len,
+    size_t slen)
+{
+	if (len > slen)
+		__chk_fail();
+
+	if (__ssp_overlap((const char *)src, (const char *)dst, len))
+		__chk_fail();
+
+	return mempcpy(dst, src, len);
+}
diff --git a/newlib/libc/ssp/memset_chk.c b/newlib/libc/ssp/memset_chk.c
new file mode 100644
index 000000000..0e303b9eb
--- /dev/null
+++ b/newlib/libc/ssp/memset_chk.c
@@ -0,0 +1,49 @@
+/*	$NetBSD: memset_chk.c,v 1.5 2014/09/17 00:39:28 joerg Exp $	*/
+
+/*-
+ * Copyright (c) 2006 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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>
+__RCSID("$NetBSD: memset_chk.c,v 1.5 2014/09/17 00:39:28 joerg Exp $");
+
+/*LINTLIBRARY*/
+
+#include <ssp/ssp.h>
+#include <string.h>
+
+#undef memset
+
+void *__memset_chk(void * __restrict, int, size_t, size_t);
+
+void *
+__memset_chk(void * __restrict dst, int val, size_t len, size_t slen)
+{
+	if (len > slen)
+		__chk_fail();
+	return memset(dst, val, len);
+}
diff --git a/newlib/libc/ssp/stpcpy_chk.c b/newlib/libc/ssp/stpcpy_chk.c
new file mode 100644
index 000000000..ed1d74ad7
--- /dev/null
+++ b/newlib/libc/ssp/stpcpy_chk.c
@@ -0,0 +1,58 @@
+/*	$NetBSD: stpcpy_chk.c,v 1.6 2015/05/09 15:42:21 christos Exp $	*/
+
+/*-
+ * Copyright (c) 2013 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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>
+__RCSID("$NetBSD: stpcpy_chk.c,v 1.6 2015/05/09 15:42:21 christos Exp $");
+
+/*LINTLIBRARY*/
+
+#include <ssp/ssp.h>
+#include <string.h>
+
+#undef memcpy
+
+#if !__GNUC_PREREQ__(4, 8)
+char *__stpcpy_chk(char * __restrict, const char * __restrict, size_t);
+#endif
+
+char *
+__stpcpy_chk(char * __restrict dst, const char * __restrict src, size_t slen)
+{
+	size_t len = strlen(src);
+
+	if (len >= slen)
+		__chk_fail();
+
+	if (__ssp_overlap(src, dst, len))
+		__chk_fail();
+
+	(void)memcpy(dst, src, len + 1);
+	return dst + len;
+}
diff --git a/newlib/libc/ssp/stpncpy_chk.c b/newlib/libc/ssp/stpncpy_chk.c
new file mode 100644
index 000000000..756626153
--- /dev/null
+++ b/newlib/libc/ssp/stpncpy_chk.c
@@ -0,0 +1,56 @@
+/*	$NetBSD: stpncpy_chk.c,v 1.3 2015/05/09 15:42:21 christos Exp $	*/
+
+/*-
+ * Copyright (c) 2013 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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>
+__RCSID("$NetBSD: stpncpy_chk.c,v 1.3 2015/05/09 15:42:21 christos Exp $");
+
+/*LINTLIBRARY*/
+
+#include <ssp/ssp.h>
+#include <string.h>
+
+#undef stpncpy
+
+#if !__GNUC_PREREQ__(4, 8)
+char *__stpncpy_chk(char * __restrict, const char * __restrict, size_t, size_t);
+#endif
+
+char *
+__stpncpy_chk(char * __restrict dst, const char * __restrict src, size_t len,
+    size_t slen)
+{
+	if (len > slen)
+		__chk_fail();
+
+	if (__ssp_overlap(src, dst, len))
+		__chk_fail();
+
+	return stpncpy(dst, src, len);
+}
diff --git a/newlib/libc/ssp/strcat_chk.c b/newlib/libc/ssp/strcat_chk.c
new file mode 100644
index 000000000..d57f9559b
--- /dev/null
+++ b/newlib/libc/ssp/strcat_chk.c
@@ -0,0 +1,62 @@
+/*	$NetBSD: strcat_chk.c,v 1.5 2014/09/17 00:39:28 joerg Exp $	*/
+
+/*-
+ * Copyright (c) 2006 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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>
+__RCSID("$NetBSD: strcat_chk.c,v 1.5 2014/09/17 00:39:28 joerg Exp $");
+
+/*LINTLIBRARY*/
+
+#include <ssp/ssp.h>
+#include <string.h>
+
+char *__strcat_chk(char * __restrict, const char * __restrict, size_t);
+
+char *
+__strcat_chk(char * __restrict dst, const char * __restrict src, size_t slen)
+{
+	char *d;
+
+	for (d = dst; *d; d++) {
+		if (slen-- == 0)
+			__chk_fail();
+	}
+
+	while (*src) {
+		if (slen-- == 0)
+			__chk_fail();
+		*d++ = *src++;
+	}
+
+	if (slen-- == 0)
+		__chk_fail();
+
+	*d = '\0';
+	return dst;
+}
diff --git a/newlib/libc/ssp/strcpy_chk.c b/newlib/libc/ssp/strcpy_chk.c
new file mode 100644
index 000000000..cef160a62
--- /dev/null
+++ b/newlib/libc/ssp/strcpy_chk.c
@@ -0,0 +1,55 @@
+/*	$NetBSD: strcpy_chk.c,v 1.8 2015/05/09 15:42:21 christos Exp $	*/
+
+/*-
+ * Copyright (c) 2006 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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>
+__RCSID("$NetBSD: strcpy_chk.c,v 1.8 2015/05/09 15:42:21 christos Exp $");
+
+/*LINTLIBRARY*/
+
+#include <ssp/ssp.h>
+#include <string.h>
+
+#undef memcpy
+
+char *__strcpy_chk(char * __restrict, const char * __restrict, size_t);
+
+char *
+__strcpy_chk(char * __restrict dst, const char * __restrict src, size_t slen)
+{
+	size_t len = strlen(src) + 1;
+
+	if (len > slen)
+		__chk_fail();
+
+	if (__ssp_overlap(src, dst, len))
+		__chk_fail();
+
+	return memcpy(dst, src, len);
+}
diff --git a/newlib/libc/ssp/strncat_chk.c b/newlib/libc/ssp/strncat_chk.c
new file mode 100644
index 000000000..5ce5a9ef6
--- /dev/null
+++ b/newlib/libc/ssp/strncat_chk.c
@@ -0,0 +1,73 @@
+/*	$NetBSD: strncat_chk.c,v 1.5 2014/09/17 00:39:28 joerg Exp $	*/
+
+/*-
+ * Copyright (c) 2006 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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>
+__RCSID("$NetBSD: strncat_chk.c,v 1.5 2014/09/17 00:39:28 joerg Exp $");
+
+/*LINTLIBRARY*/
+
+#include <ssp/ssp.h>
+#include <string.h>
+#include <stdio.h>
+
+char *__strncat_chk(char * __restrict, const char * __restrict, size_t,
+    size_t);
+
+char *
+__strncat_chk(char * __restrict dst, const char * __restrict src, size_t len,
+    size_t slen)
+{
+	char *d;
+
+	if (len == 0)
+		return dst;
+
+	if (len > slen)
+		__chk_fail();
+
+	for (d = dst; *d; d++) {
+		if (slen-- == 0)
+			__chk_fail();
+	}
+
+	do {
+		if ((*d = *src++) == '\0')
+			break;
+		if (slen-- == 0)
+			__chk_fail();
+		d++;
+	} while (--len != 0);
+
+	if (slen-- == 0)
+		__chk_fail();
+
+	*d = '\0';
+	return dst;
+}
diff --git a/newlib/libc/ssp/strncpy_chk.c b/newlib/libc/ssp/strncpy_chk.c
new file mode 100644
index 000000000..591157a25
--- /dev/null
+++ b/newlib/libc/ssp/strncpy_chk.c
@@ -0,0 +1,55 @@
+/*	$NetBSD: strncpy_chk.c,v 1.6 2015/05/09 15:42:21 christos Exp $	*/
+
+/*-
+ * Copyright (c) 2006 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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>
+__RCSID("$NetBSD: strncpy_chk.c,v 1.6 2015/05/09 15:42:21 christos Exp $");
+
+/*LINTLIBRARY*/
+
+#include <ssp/ssp.h>
+#include <string.h>
+
+#undef strncpy
+
+char *__strncpy_chk(char * __restrict, const char * __restrict, size_t,
+    size_t);
+
+char *
+__strncpy_chk(char * __restrict dst, const char * __restrict src, size_t len,
+    size_t slen)
+{
+	if (len > slen)
+		__chk_fail();
+
+	if (__ssp_overlap(src, dst, len))
+		__chk_fail();
+
+	return strncpy(dst, src, len);
+}