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A very large alignment argument passed to mealign/posix_memalign causes _int_memalign to enter an infinite loop. Limit the maximum alignment value to the maximum representable power of two to prevent this from happening. Changelog: 2013-10-30 Will Newton <will.newton@linaro.org> [BZ #16038] * malloc/hooks.c (memalign_check): Limit alignment to the maximum representable power of two. * malloc/malloc.c (__libc_memalign): Likewise. * malloc/tst-memalign.c (do_test): Add test for very large alignment values. * malloc/tst-posix_memalign.c (do_test): Likewise.
119 lines
2.9 KiB
C
119 lines
2.9 KiB
C
/* Test for posix_memalign.
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Copyright (C) 2013 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
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License as published by the Free Software Foundation; either
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version 2.1 of the 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; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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static int errors = 0;
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static void
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merror (const char *msg)
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{
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++errors;
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printf ("Error: %s\n", msg);
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}
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static int
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do_test (void)
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{
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void *p;
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int ret;
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unsigned long pagesize = getpagesize ();
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unsigned long ptrval;
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p = NULL;
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/* An attempt to allocate a huge value should return ENOMEM and
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p should remain NULL. */
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ret = posix_memalign (&p, sizeof (void *), -1);
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if (ret != ENOMEM)
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merror ("posix_memalign (&p, sizeof (void *), -1) succeeded.");
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if (ret == ENOMEM && p != NULL)
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merror ("returned an error but pointer was modified");
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free (p);
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p = NULL;
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/* Test to expose integer overflow in malloc internals from BZ #15857. */
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ret = posix_memalign (&p, pagesize, -pagesize);
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if (ret != ENOMEM)
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merror ("posix_memalign (&p, pagesize, -pagesize) succeeded.");
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free (p);
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p = NULL;
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/* Test to expose integer overflow in malloc internals from BZ #16038. */
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ret = posix_memalign (&p, -1, pagesize);
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if (ret != EINVAL)
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merror ("posix_memalign (&p, -1, pagesize) succeeded.");
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free (p);
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p = NULL;
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/* A zero-sized allocation should succeed with glibc, returning zero
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and setting p to a non-NULL value. */
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ret = posix_memalign (&p, sizeof (void *), 0);
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if (ret != 0 || p == NULL)
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merror ("posix_memalign (&p, sizeof (void *), 0) failed.");
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free (p);
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ret = posix_memalign (&p, 0x300, 10);
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if (ret != EINVAL)
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merror ("posix_memalign (&p, 0x300, 10) succeeded.");
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ret = posix_memalign (&p, 0, 10);
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if (ret != EINVAL)
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merror ("posix_memalign (&p, 0, 10) succeeded.");
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p = NULL;
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ret = posix_memalign (&p, 0x100, 10);
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if (ret != 0)
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merror ("posix_memalign (&p, 0x100, 10) failed.");
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if (ret == 0 && p == NULL)
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merror ("returned success but pointer is NULL");
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ptrval = (unsigned long) p;
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if (ret == 0 && (ptrval & 0xff) != 0)
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merror ("pointer is not aligned to 0x100");
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free (p);
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return errors != 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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