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Differential D3043 Diff 6903 lib/libc/secure/fortify_source.c

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lib/libc/secure/fortify_source.c

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/*-
* Copyright (c) 2015 Olivér Pintér <op@FreeBSD.org>
* 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 AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include "secure/security.h"
void
__fortify_chk_fail(const char* msg)
{
__secure_fail(msg);
}
int
__fortify_chk_overlap(const void *a, const void *b, size_t len)
{
return ((a <= b && b <= a + len) || (b <= a && a <= b + len));
}
kibUnsubmitted
Done
Inline Actions

You do not need four comparisions, two are enough.

Look at sys/kern/kern_rangelock.c:ranges_overlap() to see how to do it.

kib: You do not need four comparisions, two are enough. Look at sys/kern/kern_rangelock.c…
jillesUnsubmitted
Done
Inline Actions

Additionally, casts to const char * should be added before adding len to avoid depending on a GCC extension, and casts to uintptr_t should be added before comparing to avoid undefined behaviour from comparing (</<=/>/>=) pointers from different arrays.

Also, this should be an inline function.

jilles: Additionally, casts to `const char *` should be added before adding `len` to avoid depending on…
opAuthorUnsubmitted
Not Done
Inline Actions

Yes, I thinking about them too. I move then this function to include/secure/security.h file with the adjustments.

op: Yes, I thinking about them too. I move then this function to include/secure/security.h file…
opAuthorUnsubmitted
Not Done
Inline Actions

jilles: casting of len to (const char *) does not work with clang:

 op@opn /tmp> make test
 cc -O2 -pipe -pipe   -DHARDENEDBSD  test.c  -o test
 test.c:51:37: error: invalid operands to binary expression ('const char *' and 'const char *')
        if ((uintptr_t)(a) < (uintptr_t)(b + (const char *)l) &&
                                         ~ ^ ~~~~~~~~~~~~~~~
 test.c:52:20: error: invalid operands to binary expression ('const char *' and 'const char *')
            (uintptr_t)(a + (const char *)l) > (uintptr_t)(b))
                        ~ ^ ~~~~~~~~~~~~~~~
2 errors generated.
 *** Error code 1
op: jilles: casting of len to (const char *) does not work with clang: ``` op@opn /tmp> make test…