mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 05:00:15 +00:00
768c83b7f6
pvalloc is guarantueed to round up the allocation size to the page
size, so applications can assume that the memory region is larger
than the passed-in argument. The alloc_size attribute cannot express
that.
The test case is based on a suggestion from Jakub Jelinek.
This fixes commit 9bf8e29ca1 ("malloc:
make malloc fail with requests larger than PTRDIFF_MAX (BZ#23741)").
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/* Test fortify-source allocation size handling in pvalloc (bug 25401).
|
|
Copyright (C) 2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public License as
|
|
published by the Free Software Foundation; either version 2.1 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
#undef _FORTIFY_SOURCE
|
|
#define _FORTIFY_SOURCE 2
|
|
#include <malloc.h>
|
|
#include <string.h>
|
|
#include <support/check.h>
|
|
#include <support/xunistd.h>
|
|
#include <unistd.h>
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
/* The test below assumes that pvalloc rounds up the allocation size
|
|
to at least 8. */
|
|
TEST_VERIFY (xsysconf (_SC_PAGESIZE) >= 8);
|
|
|
|
void *p = pvalloc (5);
|
|
TEST_VERIFY_EXIT (p != NULL);
|
|
|
|
/* This is valid assuming the page size is at least 8 because
|
|
pvalloc rounds up the allocation size to a multiple of the page
|
|
size. Due to bug 25041, this used to trigger a compiler
|
|
warning. */
|
|
strcpy (p, "abcdefg");
|
|
|
|
asm ("" : : "g" (p) : "memory"); /* Optimization barrier. */
|
|
TEST_VERIFY (malloc_usable_size (p) >= xsysconf (_SC_PAGESIZE));
|
|
return 0;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|