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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).
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <https://www.gnu.org/licenses/>. */
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#undef _FORTIFY_SOURCE
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#define _FORTIFY_SOURCE 2
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#include <malloc.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/xunistd.h>
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#include <unistd.h>
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static int
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do_test (void)
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{
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/* The test below assumes that pvalloc rounds up the allocation size
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to at least 8. */
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TEST_VERIFY (xsysconf (_SC_PAGESIZE) >= 8);
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void *p = pvalloc (5);
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TEST_VERIFY_EXIT (p != NULL);
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/* This is valid assuming the page size is at least 8 because
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pvalloc rounds up the allocation size to a multiple of the page
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size. Due to bug 25041, this used to trigger a compiler
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warning. */
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strcpy (p, "abcdefg");
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asm ("" : : "g" (p) : "memory"); /* Optimization barrier. */
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TEST_VERIFY (malloc_usable_size (p) >= xsysconf (_SC_PAGESIZE));
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return 0;
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}
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#include <support/test-driver.c>
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