Re: git: be04fec42638 - main - Import _FORTIFY_SOURCE implementation from NetBSD
Date: Sun, 19 May 2024 01:09:17 UTC
(sorry for top posting .. my mailer just sucks)Hi;
I used to like the limited static checking FORTIFY_SOURCE provides and when I ran it over FreeBSD it did find a couple of minor issues. It only works for GCC though.
I guess it doesn't really hurt to have FORTIFY_SOURCE around and NetBSD had the least intrusive implementation the last time I checked but I would certainly request it should never be activated by default, specially with clang. The GCC version has seen more development on glibc but I still think its a dead end.
What I would like to see working on FreeBSD is Safestack as a replacement for the stack protector, which we were so very slow to adopt even when it was originally developed in FreeBSD. I think other projects based on FreeBSD (Chimera and hardenedBSD) have been using it but I don't know the details.
This is just all my $0.02
Pedro.
On Saturday, May 18, 2024 at 05:54:42 PM GMT-5, Kyle Evans <kaevans@fastmail.com> wrote:
On May 18, 2024 13:42, Pedro Giffuni <pfg@freebsd.org> wrote:
Oh no .. please not...
We went into that in a GSoC:
https://wiki.freebsd.org/SummerOfCode2015/FreeBSDLibcSecurityExtensions
Ultimately it proved to be useless since stack-protector-strong.
Respectfully, I disagree with your conclusion here:
1.) _FORTIFY_SOURCE provides more granular detection of overflow; I don't have to overflow all the way into the canary at the end of the frame to be detected, so my minor bug now can be caught before something causes the stack frame to be rearranged and turn it into a security issue later
2.) __builtin_object_size doesn't work on heap objects, but it actually can work on subobjects from a heap allocation (e.g., &foo->name), so the coverage extends beyond the stack into starting to detect other kinds of overflow
While the security value over stack-protector-strong may be marginal (I won't debate this specifically), the feature still has value in general.
Thanks,
Kyle Evans
The NetBSD code was not well adapted to clang either.
Ask me more if you really want to dig into it, but we don't want this.
Pedro.
On Monday, May 13, 2024 at 12:24:13 AM GMT-5, Kyle Evans <kevans@freebsd.org> wrote:
The branch main has been updated by kevans:
URL: https://cgit.FreeBSD.org/src/commit/?id=be04fec42638f30f50b5b55fd8e3634c0fb89928
commit be04fec42638f30f50b5b55fd8e3634c0fb89928
Author: Kyle Evans <kevans@FreeBSD.org>
AuthorDate: 2024-05-13 05:23:49 +0000
Commit: Kyle Evans <kevans@FreeBSD.org>
CommitDate: 2024-05-13 05:23:49 +0000
Import _FORTIFY_SOURCE implementation from NetBSD
This is a mostly-unmodified copy of the various *_chk implementations
and headers from NetBSD, without yet modifying system headers to start
actually including them. A future commit will also apply the needed
bits to fix ssp/unistd.h.
Reviewed by: imp, pauamma_gundo.com (both previous versions), kib
Sponsored by: Stormshield
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D32306
---
etc/mtree/BSD.include.dist | 2 +
include/Makefile | 2 +-
include/ssp/Makefile | 6 ++
include/ssp/ssp.h | 91 ++++++++++++++++++++++++++
include/ssp/stdio.h | 93 ++++++++++++++++++++++++++
include/ssp/string.h | 129 ++++++++++++++++++++++++++++++++++++
include/ssp/strings.h | 67 +++++++++++++++++++
include/ssp/unistd.h | 54 +++++++++++++++
lib/libc/secure/Makefile.inc | 11 ++++
lib/libc/secure/Symbol.map | 18 +++++
lib/libc/secure/fgets_chk.c | 54 +++++++++++++++
lib/libc/secure/gets_chk.c | 74 +++++++++++++++++++++
lib/libc/secure/memcpy_chk.c | 53 +++++++++++++++
lib/libc/secure/memmove_chk.c | 47 +++++++++++++
lib/libc/secure/memset_chk.c | 46 +++++++++++++
lib/libc/secure/snprintf_chk.c | 56 ++++++++++++++++
lib/libc/secure/sprintf_chk.c | 61 +++++++++++++++++
lib/libc/secure/ssp_internal.h | 37 +++++++++++
lib/libc/secure/stpcpy_chk.c | 55 ++++++++++++++++
lib/libc/secure/stpncpy_chk.c | 53 +++++++++++++++
lib/libc/secure/strcat_chk.c | 60 +++++++++++++++++
lib/libc/secure/strcpy_chk.c | 54 +++++++++++++++
lib/libc/secure/strncat_chk.c | 70 ++++++++++++++++++++
lib/libc/secure/strncpy_chk.c | 53 +++++++++++++++
lib/libc/secure/vsnprintf_chk.c | 49 ++++++++++++++
lib/libc/secure/vsprintf_chk.c | 58 ++++++++++++++++
lib/libssp/Makefile | 20 +++++-
lib/libssp/Symbol.map | 12 ++--
lib/libssp/Versions.def | 5 ++
lib/libssp/__builtin_object_size.3 | 110 +++++++++++++++++++++++++++++++
lib/libssp/fortify_stubs.c | 131 -------------------------------------
lib/libssp/ssp.3 | 130 ++++++++++++++++++++++++++++++++++++
32 files changed, 1621 insertions(+), 140 deletions(-)
diff --git a/etc/mtree/BSD.include.dist b/etc/mtree/BSD.include.dist
index a6bd5880bf61..f8c83d6dde7a 100644
--- a/etc/mtree/BSD.include.dist
+++ b/etc/mtree/BSD.include.dist
@@ -372,6 +372,8 @@
mac_veriexec
..
..
+ ssp
+ ..
sys
disk
..
diff --git a/include/Makefile b/include/Makefile
index 19e6beb95203..32774419f162 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -4,7 +4,7 @@
PACKAGE=clibs
CLEANFILES= osreldate.h version
-SUBDIR= arpa protocols rpcsvc rpc xlocale
+SUBDIR= arpa protocols rpcsvc rpc ssp xlocale
.if ${MACHINE_CPUARCH} == "amd64"
SUBDIR+= i386
INCLUDE_SUBDIRS+= i386
diff --git a/include/ssp/Makefile b/include/ssp/Makefile
new file mode 100644
index 000000000000..dff19f43c920
--- /dev/null
+++ b/include/ssp/Makefile
@@ -0,0 +1,6 @@
+# $FreeBSD$
+
+INCS= ssp.h stdio.h string.h strings.h unistd.h
+INCSDIR= ${INCLUDEDIR}/ssp
+
+.include <bsd.prog.mk>
diff --git a/include/ssp/ssp.h b/include/ssp/ssp.h
new file mode 100644
index 000000000000..35a9aeee02df
--- /dev/null
+++ b/include/ssp/ssp.h
@@ -0,0 +1,91 @@
+/* $NetBSD: ssp.h,v 1.13 2015/09/03 20:43:47 plunky Exp $ */
+
+/*-
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2006, 2011 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.
+ */
+#ifndef _SSP_SSP_H_
+#define _SSP_SSP_H_
+
+#include <sys/cdefs.h>
+
+#if !defined(__cplusplus)
+# if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && \
+ (__OPTIMIZE__ > 0 || defined(__clang__))
+# if _FORTIFY_SOURCE > 1
+# define __SSP_FORTIFY_LEVEL 2
+# else
+# define __SSP_FORTIFY_LEVEL 1
+# endif
+# else
+# define __SSP_FORTIFY_LEVEL 0
+# endif
+#else
+# define __SSP_FORTIFY_LEVEL 0
+#endif
+
+#define __ssp_var(type) __CONCAT(__ssp_ ## type, __COUNTER__)
+
+/* __ssp_real is used by the implementation in libc */
+#if __SSP_FORTIFY_LEVEL == 0
+#define __ssp_real_(fun) fun
+#else
+#define __ssp_real_(fun) __ssp_real_ ## fun
+#endif
+#define __ssp_real(fun) __ssp_real_(fun)
+
+#define __ssp_inline static __inline __attribute__((__always_inline__))
+
+#define __ssp_bos(ptr) __builtin_object_size(ptr, __SSP_FORTIFY_LEVEL > 1)
+#define __ssp_bos0(ptr) __builtin_object_size(ptr, 0)
+
+#define __ssp_check(buf, len, bos) \
+ if (bos(buf) != (size_t)-1 && len > bos(buf)) \
+ __chk_fail()
+#define __ssp_redirect_raw(rtype, fun, symbol, args, call, cond, bos) \
+rtype __ssp_real_(fun) args __RENAME(symbol); \
+__ssp_inline rtype fun args __RENAME(__ssp_protected_ ## fun); \
+__ssp_inline rtype fun args { \
+ if (cond) \
+ __ssp_check(__buf, __len, bos); \
+ return __ssp_real_(fun) call; \
+}
+
+#define __ssp_redirect(rtype, fun, args, call) \
+ __ssp_redirect_raw(rtype, fun, fun, args, call, 1, __ssp_bos)
+#define __ssp_redirect0(rtype, fun, args, call) \
+ __ssp_redirect_raw(rtype, fun, fun, args, call, 1, __ssp_bos0)
+
+__BEGIN_DECLS
+void __stack_chk_fail(void) __dead2;
+void __chk_fail(void) __dead2;
+__END_DECLS
+
+#endif /* _SSP_SSP_H_ */
diff --git a/include/ssp/stdio.h b/include/ssp/stdio.h
new file mode 100644
index 000000000000..72e3236eac80
--- /dev/null
+++ b/include/ssp/stdio.h
@@ -0,0 +1,93 @@
+/* $NetBSD: stdio.h,v 1.5 2011/07/17 20:54:34 joerg Exp $ */
+
+/*-
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * 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.
+ */
+#ifndef _SSP_STDIO_H_
+#define _SSP_STDIO_H_
+
+#include <ssp/ssp.h>
+
+__BEGIN_DECLS
+int __sprintf_chk(char *__restrict, int, size_t, const char *__restrict, ...)
+ __printflike(4, 5);
+int __vsprintf_chk(char *__restrict, int, size_t, const char *__restrict,
+ __va_list)
+ __printflike(4, 0);
+int __snprintf_chk(char *__restrict, size_t, int, size_t,
+ const char *__restrict, ...)
+ __printflike(5, 6);
+int __vsnprintf_chk(char *__restrict, size_t, int, size_t,
+ const char *__restrict, __va_list)
+ __printflike(5, 0);
+char *__gets_chk(char *, size_t);
+char *__fgets_chk(char *, int, size_t, FILE *);
+__END_DECLS
+
+#if __SSP_FORTIFY_LEVEL > 0
+
+#define sprintf(str, ...) ({ \
+ char *_ssp_str = (str); \
+ __builtin___sprintf_chk(_ssp_str, 0, __ssp_bos(_ssp_str), \
+ __VA_ARGS__); \
+})
+
+#define vsprintf(str, fmt, ap) ({ \
+ char *_ssp_str = (str); \
+ __builtin___vsprintf_chk(_ssp_str, 0, __ssp_bos(_ssp_str), fmt, \
+ ap); \
+})
+
+#define snprintf(str, len, ...) ({ \
+ char *_ssp_str = (str); \
+ __builtin___snprintf_chk(_ssp_str, len, 0, __ssp_bos(_ssp_str), \
+ __VA_ARGS__); \
+})
+
+#define vsnprintf(str, len, fmt, ap) ({ \
+ char *_ssp_str = (str); \
+ __builtin___vsnprintf_chk(_ssp_str, len, 0, __ssp_bos(_ssp_str), \
+ fmt, ap); \
+})
+
+#define gets(str) ({ \
+ char *_ssp_str = (str); \
+ __gets_chk(_ssp_str, __ssp_bos(_ssp_str)); \
+})
+
+#define fgets(str, len, fp) ({ \
+ char *_ssp_str = (str); \
+ __fgets_chk(_ssp_str, len, __ssp_bos(_ssp_str), fp); \
+})
+
+#endif /* __SSP_FORTIFY_LEVEL > 0 */
+
+#endif /* _SSP_STDIO_H_ */
diff --git a/include/ssp/string.h b/include/ssp/string.h
new file mode 100644
index 000000000000..996020fda778
--- /dev/null
+++ b/include/ssp/string.h
@@ -0,0 +1,129 @@
+/* $NetBSD: string.h,v 1.14 2020/09/05 13:37:59 mrg Exp $ */
+
+/*-
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * 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.
+ */
+#ifndef _SSP_STRING_H_
+#define _SSP_STRING_H_
+
+#include <ssp/ssp.h>
+
+__BEGIN_DECLS
+void *__memcpy_chk(void *, const void *, size_t, size_t);
+void *__memmove_chk(void *, const void *, size_t, size_t);
+void *__memset_chk(void *, int, size_t, size_t);
+char *__stpcpy_chk(char *, const char *, size_t);
+char *__stpncpy_chk(char *, const char *, size_t, size_t);
+char *__strcat_chk(char *, const char *, size_t);
+char *__strcpy_chk(char *, const char *, size_t);
+char *__strncat_chk(char *, const char *, size_t, size_t);
+char *__strncpy_chk(char *, const char *, size_t, size_t);
+__END_DECLS
+
+#if __SSP_FORTIFY_LEVEL > 0
+
+#define __ssp_bos_check3_typed_var(fun, dsttype, dsrvar, dst, srctype, srcvar, \
+ src, lenvar, len) ({ \
+ srctype srcvar = (src); \
+ dsttype dstvar = (dst); \
+ size_t lenvar = (len); \
+ ((__ssp_bos0(dstvar) != (size_t)-1) ? \
+ __builtin___ ## fun ## _chk(dstvar, srcvar, lenvar, \
+ __ssp_bos0(dstvar)) : \
+ __ ## fun ## _ichk(dstvar, srcvar, lenvar)); \
+})
+
+#define __ssp_bos_check3_typed(fun, dsttype, dst, srctype, src, len) \
+ __ssp_bos_check3_typed_var(fun, dsttype, __ssp_var(dstv), dst, \
+ srctype, __ssp_var(srcv), src, __ssp_var(lenv), len)
+
+#define __ssp_bos_check3(fun, dst, src, len) \
+ __ssp_bos_check3_typed_var(fun, void *, __ssp_var(dstv), dst, \
+ const void *, __ssp_var(srcv), src, __ssp_var(lenv), len)
+
+#define __ssp_bos_check2_var(fun, dstvar, dst, srcvar, src) ({ \
+ const void *srcvar = (src); \
+ void *dstvar = (dst); \
+ ((__ssp_bos0(dstvar) != (size_t)-1) ? \
+ __builtin___ ## fun ## _chk(dstvar, srcvar, \
+ __ssp_bos0(dstvar)) : \
+ __ ## fun ## _ichk(dstvar, srcvar)); \
+})
+
+#define __ssp_bos_check2(fun, dst, src) \
+ __ssp_bos_check2_var(fun, __ssp_var(dstv), dst, __ssp_var(srcv), src)
+
+#define __ssp_bos_icheck3_restrict(fun, type1, type2) \
+static __inline type1 __ ## fun ## _ichk(type1 __restrict, type2 __restrict, size_t); \
+static __inline __attribute__((__always_inline__)) type1 \
+__ ## fun ## _ichk(type1 __restrict dst, type2 __restrict src, size_t len) { \
+ return __builtin___ ## fun ## _chk(dst, src, len, __ssp_bos0(dst)); \
+}
+
+#define __ssp_bos_icheck3(fun, type1, type2) \
+static __inline type1 __ ## fun ## _ichk(type1, type2, size_t); \
+static __inline __attribute__((__always_inline__)) type1 \
+__ ## fun ## _ichk(type1 dst, type2 src, size_t len) { \
+ return __builtin___ ## fun ## _chk(dst, src, len, __ssp_bos0(dst)); \
+}
+
+#define __ssp_bos_icheck2_restrict(fun, type1, type2) \
+static __inline type1 __ ## fun ## _ichk(type1, type2); \
+static __inline __attribute__((__always_inline__)) type1 \
+__ ## fun ## _ichk(type1 __restrict dst, type2 __restrict src) { \
+ return __builtin___ ## fun ## _chk(dst, src, __ssp_bos0(dst)); \
+}
+
+__BEGIN_DECLS
+__ssp_bos_icheck3_restrict(memcpy, void *, const void *)
+__ssp_bos_icheck3(memmove, void *, const void *)
+__ssp_bos_icheck3(memset, void *, int)
+__ssp_bos_icheck2_restrict(stpcpy, char *, const char *)
+__ssp_bos_icheck3_restrict(stpncpy, char *, const char *)
+__ssp_bos_icheck2_restrict(strcpy, char *, const char *)
+__ssp_bos_icheck2_restrict(strcat, char *, const char *)
+__ssp_bos_icheck3_restrict(strncpy, char *, const char *)
+__ssp_bos_icheck3_restrict(strncat, char *, const char *)
+__END_DECLS
+
+#define memcpy(dst, src, len) __ssp_bos_check3(memcpy, dst, src, len)
+#define memmove(dst, src, len) __ssp_bos_check3(memmove, dst, src, len)
+#define memset(dst, val, len) \
+ __ssp_bos_check3_typed(memset, void *, dst, int, val, len)
+#define stpcpy(dst, src) __ssp_bos_check2(stpcpy, dst, src)
+#define stpncpy(dst, src, len) __ssp_bos_check3(stpncpy, dst, src, len)
+#define strcpy(dst, src) __ssp_bos_check2(strcpy, dst, src)
+#define strcat(dst, src) __ssp_bos_check2(strcat, dst, src)
+#define strncpy(dst, src, len) __ssp_bos_check3(strncpy, dst, src, len)
+#define strncat(dst, src, len) __ssp_bos_check3(strncat, dst, src, len)
+
+#endif /* __SSP_FORTIFY_LEVEL > 0 */
+#endif /* _SSP_STRING_H_ */
diff --git a/include/ssp/strings.h b/include/ssp/strings.h
new file mode 100644
index 000000000000..06c9c7cc0a09
--- /dev/null
+++ b/include/ssp/strings.h
@@ -0,0 +1,67 @@
+/* $NetBSD: strings.h,v 1.3 2008/04/28 20:22:54 martin Exp $ */
+
+/*-
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2007 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.
+ */
+#ifndef _SSP_STRINGS_H_
+#define _SSP_STRINGS_H_
+
+#include <ssp/ssp.h>
+#include <string.h>
+
+#if __SSP_FORTIFY_LEVEL > 0
+
+#define _ssp_bcopy(srcvar, src, dstvar, dst, lenvar, len) ({ \
+ const void *srcvar = (src); \
+ void *dstvar = (dst); \
+ size_t lenvar = (len); \
+ ((__ssp_bos0(dstvar) != (size_t)-1) ? \
+ __builtin___memmove_chk(dstvar, srcvar, lenvar, \
+ __ssp_bos0(dstvar)) : \
+ __memmove_ichk(dstvar, srcvar, lenvar)); \
+})
+
+#define bcopy(src, dst, len) \
+ _ssp_bcopy(__ssp_var(srcv), src, __ssp_var(dstv), dst, __ssp_var(lenv), len)
+
+#define _ssp_bzero(dstvar, dst, lenvar, len) ({ \
+ void *dstvar = (dst); \
+ size_t lenvar = (len); \
+ ((__ssp_bos0(dstvar) != (size_t)-1) ? \
+ __builtin___memset_chk(dstvar, 0, lenvar, \
+ __ssp_bos0(dstvar)) : \
+ __memset_ichk(dstvar, 0, lenvar)); \
+})
+
+#define bzero(dst, len) _ssp_bzero(__ssp_var(dstv), dst, __ssp_var(lenv), len)
+
+#endif /* __SSP_FORTIFY_LEVEL > 0 */
+#endif /* _SSP_STRINGS_H_ */
diff --git a/include/ssp/unistd.h b/include/ssp/unistd.h
new file mode 100644
index 000000000000..2414e2baa96b
--- /dev/null
+++ b/include/ssp/unistd.h
@@ -0,0 +1,54 @@
+/* $NetBSD: unistd.h,v 1.7 2015/06/25 18:41:03 joerg Exp $ */
+
+/*-
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * 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.
+ */
+#ifndef _SSP_UNISTD_H_
+#define _SSP_UNISTD_H_
+
+#include <ssp/ssp.h>
+
+#if __SSP_FORTIFY_LEVEL > 0
+__BEGIN_DECLS
+
+__ssp_redirect0(ssize_t, read, (int __fd, void *__buf, size_t __len), \
+ (__fd, __buf, __len));
+
+__ssp_redirect(ssize_t, readlink, (const char *__restrict __path, \
+ char *__restrict __buf, size_t __len), (__path, __buf, __len));
+
+__ssp_redirect_raw(char *, getcwd, getcwd, (char *__buf, size_t __len),
+ (__buf, __len), __buf != 0, __ssp_bos);
+
+__END_DECLS
+
+#endif /* __SSP_FORTIFY_LEVEL > 0 */
+#endif /* _SSP_UNISTD_H_ */
diff --git a/lib/libc/secure/Makefile.inc b/lib/libc/secure/Makefile.inc
index 8574c5a05dc5..3b1ad879c715 100644
--- a/lib/libc/secure/Makefile.inc
+++ b/lib/libc/secure/Makefile.inc
@@ -3,6 +3,17 @@
.PATH: ${LIBC_SRCTOP}/secure
+# _FORTIFY_SOURCE
+SRCS+= gets_chk.c fgets_chk.c memcpy_chk.c memmove_chk.c memset_chk.c \
+ snprintf_chk.c sprintf_chk.c stpcpy_chk.c stpncpy_chk.c \
+ strcat_chk.c strcpy_chk.c strncat_chk.c strncpy_chk.c \
+ vsnprintf_chk.c vsprintf_chk.c
+
+CFLAGS.snprintf_chk.c+= -Wno-unused-parameter
+CFLAGS.sprintf_chk.c+= -Wno-unused-parameter
+CFLAGS.vsnprintf_chk.c+= -Wno-unused-parameter
+CFLAGS.vsprintf_chk.c+= -Wno-unused-parameter
+
# Sources common to both syscall interfaces:
SRCS+= stack_protector.c \
stack_protector_compat.c
diff --git a/lib/libc/secure/Symbol.map b/lib/libc/secure/Symbol.map
index 641f451b5421..7859fcee3821 100644
--- a/lib/libc/secure/Symbol.map
+++ b/lib/libc/secure/Symbol.map
@@ -3,3 +3,21 @@ FBSD_1.0 {
__stack_chk_fail;
__stack_chk_guard;
};
+
+FBSD_1.8 {
+ __gets_chk;
+ __fgets_chk;
+ __memcpy_chk;
+ __memmove_chk;
+ __memset_chk;
+ __snprintf_chk;
+ __sprintf_chk;
+ __stpcpy_chk;
+ __stpncpy_chk;
+ __strcat_chk;
+ __strcpy_chk;
+ __strncat_chk;
+ __strncpy_chk;
+ __vsnprintf_chk;
+ __vsprintf_chk;
+};
diff --git a/lib/libc/secure/fgets_chk.c b/lib/libc/secure/fgets_chk.c
new file mode 100644
index 000000000000..72aa1d816ce1
--- /dev/null
+++ b/lib/libc/secure/fgets_chk.c
@@ -0,0 +1,54 @@
+/*-
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * 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: fgets_chk.c,v 1.6 2009/02/05 05:41:51 lukem Exp $");
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <ssp/stdio.h>
+#include <ssp/string.h>
+#undef fgets
+
+char *
+__fgets_chk(char * __restrict buf, int len, size_t slen, FILE *fp)
+{
+ if (slen >= (size_t)INT_MAX)
+ return (fgets(buf, len, fp));
+
+ if (len >= 0 && (size_t)len > slen)
+ __chk_fail();
+
+ return (fgets(buf, len, fp));
+}
diff --git a/lib/libc/secure/gets_chk.c b/lib/libc/secure/gets_chk.c
new file mode 100644
index 000000000000..18c1e2d18f43
--- /dev/null
+++ b/lib/libc/secure/gets_chk.c
@@ -0,0 +1,74 @@
+/*-
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * 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: gets_chk.c,v 1.7 2013/10/04 20:49:16 christos Exp $");
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <ssp/stdio.h>
+#include <ssp/string.h>
+
+char *__gets_unsafe(char *);
+
+char *
+__gets_chk(char * __restrict buf, size_t slen)
+{
+ char *abuf;
+ size_t len;
+
+ if (slen >= (size_t)INT_MAX)
+ return (__gets_unsafe(buf));
+
+ if ((abuf = malloc(slen + 1)) == NULL)
+ return (__gets_unsafe(buf));
+
+ if (fgets(abuf, (int)(slen + 1), stdin) == NULL) {
+ free(abuf);
+ return (NULL);
+ }
+
+ len = strlen(abuf);
+ if (len > 0 && abuf[len - 1] == '\n')
+ --len;
+
+ if (len >= slen)
+ __chk_fail();
+
+ (void)memcpy(buf, abuf, len);
+
+ buf[len] = '\0';
+ free(abuf);
+ return (buf);
+}
diff --git a/lib/libc/secure/memcpy_chk.c b/lib/libc/secure/memcpy_chk.c
new file mode 100644
index 000000000000..99cf2d5f13ff
--- /dev/null
+++ b/lib/libc/secure/memcpy_chk.c
@@ -0,0 +1,53 @@
+/*-
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * 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 $");
+
+#include <string.h>
+
+#include <ssp/string.h>
+#undef memcpy
+
+#include "ssp_internal.h"
+
+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/lib/libc/secure/memmove_chk.c b/lib/libc/secure/memmove_chk.c
new file mode 100644
index 000000000000..07f965d608fc
--- /dev/null
+++ b/lib/libc/secure/memmove_chk.c
@@ -0,0 +1,47 @@
+/*-
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * 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 1.6 2020/09/05 13:37:59 mrg Exp $");
+
+#include <string.h>
+
+#include <ssp/string.h>
+#undef memmove
+
+void *
+__memmove_chk(void *dst, const void *src, size_t len,
+ size_t slen)
+{
+ if (len > slen)
+ __chk_fail();
+ return (memmove(dst, src, len));
+}
diff --git a/lib/libc/secure/memset_chk.c b/lib/libc/secure/memset_chk.c
new file mode 100644
index 000000000000..f337be98b46d
--- /dev/null
+++ b/lib/libc/secure/memset_chk.c
@@ -0,0 +1,46 @@
+/*-
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * 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 $");
+
+#include <string.h>
+
+#include <ssp/string.h>
+#undef memset
+
+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/lib/libc/secure/snprintf_chk.c b/lib/libc/secure/snprintf_chk.c
new file mode 100644
index 000000000000..52ef874ede5b
--- /dev/null
+++ b/lib/libc/secure/snprintf_chk.c
@@ -0,0 +1,56 @@
+/*-
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * 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: snprintf_chk.c,v 1.5 2008/04/28 20:23:00 martin Exp $");
+
+#include <stdarg.h>
+#include <stdio.h>
+
+#include <ssp/stdio.h>
+#undef vsnprintf
+
+int
+__snprintf_chk(char * __restrict buf, size_t len, int flags, size_t slen,
+ const char * __restrict fmt, ...)
+{
+ va_list ap;
+ int rv;
+
+ if (len > slen)
+ __chk_fail();
+
+ va_start(ap, fmt);
+ rv = vsnprintf(buf, len, fmt, ap);
+ va_end(ap);
+
+ return (rv);
+}
diff --git a/lib/libc/secure/sprintf_chk.c b/lib/libc/secure/sprintf_chk.c
new file mode 100644
index 000000000000..d4c42ccba3ce
--- /dev/null
+++ b/lib/libc/secure/sprintf_chk.c
@@ -0,0 +1,61 @@
+/*-
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2006 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
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