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ssp: add Object Size Checking for stdio.h, part 1 

The implementation is mostly from NetBSD, except for switching fgets to
pure inline, and the addition of fgets_unlocked, fread, and fread_unlocked
for parity with glibc.  The following functions are also guarded in glibc:
asprintf, dprintf, fprintf, printf, vasprintf, vdprintf, vfprintf, vprintf.

Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>
This commit is contained in:
Yaakov Selkowitz 2017-11-27 23:24:16 -06:00
parent a997f98b2a
commit 576093d46b
7 changed files with 416 additions and 0 deletions
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101
newlib/libc/include/ssp/stdio.h Normal file
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@ -0,0 +1,101 @@
/* $NetBSD: stdio.h,v 1.5 2011/07/17 20:54:34 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.
*/
#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);
__END_DECLS
#if __SSP_FORTIFY_LEVEL > 0
#define sprintf(str, ...) \
__builtin___sprintf_chk(str, 0, __ssp_bos(str), __VA_ARGS__)
#define vsprintf(str, fmt, ap) \
__builtin___vsprintf_chk(str, 0, __ssp_bos(str), fmt, ap)
#define snprintf(str, len, ...) \
__builtin___snprintf_chk(str, len, 0, __ssp_bos(str), __VA_ARGS__)
#define vsnprintf(str, len, fmt, ap) \
__builtin___vsnprintf_chk(str, len, 0, __ssp_bos(str), fmt, ap)
#define gets(str) \
__gets_chk(str, __ssp_bos(str))
__ssp_decl(char *, fgets, (char *__restrict __buf, int __len, FILE *__fp))
{
if (__len > 0)
__ssp_check(__buf, (size_t)__len, __ssp_bos);
return __ssp_real_fgets(__buf, __len, __fp);
}
#if __GNU_VISIBLE
__ssp_decl(char *, fgets_unlocked, (char *__restrict __buf, int __len, FILE *__fp))
{
if (__len > 0)
__ssp_check(__buf, (size_t)__len, __ssp_bos);
return __ssp_real_fgets_unlocked(__buf, __len, __fp);
}
#endif /* __GNU_VISIBLE */
__ssp_decl(size_t, fread, (void *__restrict __ptr, size_t __size, size_t __n, FILE *__restrict __fp))
{
__ssp_check(__ptr, __size * __n, __ssp_bos0);
return __ssp_real_fread(__ptr, __size, __n, __fp);
}
#if __MISC_VISIBLE
__ssp_decl(size_t, fread_unlocked, (void *__restrict __ptr, size_t __size, size_t __n, FILE *__restrict __fp))
{
__ssp_check(__ptr, __size * __n, __ssp_bos0);
return __ssp_real_fread_unlocked(__ptr, __size, __n, __fp);
}
#endif /* __MISC_VISIBLE */
#endif /* __SSP_FORTIFY_LEVEL > 0 */
#endif /* _SSP_STDIO_H_ */

4
newlib/libc/include/stdio.h
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@ -796,4 +796,8 @@ _putchar_unlocked(int _c)
_END_STD_C
#if __SSP_FORTIFY_LEVEL > 0
#include <ssp/stdio.h>
#endif
#endif /* _STDIO_H_ */

78
newlib/libc/ssp/gets_chk.c Normal file
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/* $NetBSD: gets_chk.c,v 1.7 2013/10/04 20:49:16 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: gets_chk.c,v 1.7 2013/10/04 20:49:16 christos Exp $");
/*LINTLIBRARY*/
#include <ssp/ssp.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <stdlib.h>
#include <ssp/stdio.h>
extern char *__gets(char *);
#undef gets
#ifdef __NEWLIB__
#define __gets gets
#endif
char *
__gets_chk(char * __restrict buf, size_t slen)
{
char *abuf;
size_t len;
if (slen >= (size_t)INT_MAX)
return __gets(buf);
if ((abuf = malloc(slen + 1)) == NULL)
return __gets(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;
}

59
newlib/libc/ssp/snprintf_chk.c Normal file
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@ -0,0 +1,59 @@
/* $NetBSD: snprintf_chk.c,v 1.5 2008/04/28 20:23:00 martin 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: snprintf_chk.c,v 1.5 2008/04/28 20:23:00 martin Exp $");
/*LINTLIBRARY*/
#include <ssp/ssp.h>
#include <stdio.h>
#include <stdarg.h>
#include <ssp/stdio.h>
#undef vsnprintf
/*ARGSUSED*/
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;
}

63
newlib/libc/ssp/sprintf_chk.c Normal file
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@ -0,0 +1,63 @@
/* $NetBSD: sprintf_chk.c,v 1.6 2009/02/05 05:40:36 lukem 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: sprintf_chk.c,v 1.6 2009/02/05 05:40:36 lukem Exp $");
/*LINTLIBRARY*/
#include <ssp/ssp.h>
#include <stdio.h>
#include <limits.h>
#include <stdarg.h>
#include <ssp/stdio.h>
#undef vsnprintf
#undef vsprintf
int
/*ARGSUSED*/
__sprintf_chk(char * __restrict buf, int flags, size_t slen,
const char * __restrict fmt, ...)
{
va_list ap;
int rv;
va_start(ap, fmt);
if (slen > (size_t)INT_MAX)
rv = vsprintf(buf, fmt, ap);
else {
if ((rv = vsnprintf(buf, slen, fmt, ap)) >= 0 && (size_t)rv >= slen)
__chk_fail();
}
va_end(ap);
return rv;
}

51
newlib/libc/ssp/vsnprintf_chk.c Normal file
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@ -0,0 +1,51 @@
/* $NetBSD: vsnprintf_chk.c,v 1.5 2008/04/28 20:23:00 martin 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: vsnprintf_chk.c,v 1.5 2008/04/28 20:23:00 martin Exp $");
/*LINTLIBRARY*/
#include <ssp/ssp.h>
#include <stdio.h>
#include <stdarg.h>
#include <ssp/stdio.h>
#undef vsnprintf
int
__vsnprintf_chk(char * __restrict buf, size_t len, int flags, size_t slen,
const char * __restrict fmt, va_list ap)
{
if (len > slen)
__chk_fail();
return vsnprintf(buf, len, fmt, ap);
}

60
newlib/libc/ssp/vsprintf_chk.c Normal file
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@ -0,0 +1,60 @@
/* $NetBSD: vsprintf_chk.c,v 1.6 2009/02/05 05:39:38 lukem 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: vsprintf_chk.c,v 1.6 2009/02/05 05:39:38 lukem Exp $");
/*LINTLIBRARY*/
#include <ssp/ssp.h>
#include <stdio.h>
#include <limits.h>
#include <stdarg.h>
#include <ssp/stdio.h>
#undef vsprintf
#undef vsnprintf
/*ARGSUSED*/
int
__vsprintf_chk(char * __restrict buf, int flags, size_t slen,
const char * __restrict fmt, va_list ap)
{
int rv;
if (slen > (size_t)INT_MAX)
rv = vsprintf(buf, fmt, ap);
else {
if ((rv = vsnprintf(buf, slen, fmt, ap)) >= 0 && (size_t)rv >= slen)
__chk_fail();
}
return rv;
}