1  /* Test fortify-source allocation size handling in pvalloc (bug 25401).
       2     Copyright (C) 2020-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public License as
       7     published by the Free Software Foundation; either version 2.1 of the
       8     License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; see the file COPYING.LIB.  If
      17     not, see <https://www.gnu.org/licenses/>.  */
      18  
      19  #undef _FORTIFY_SOURCE
      20  #define _FORTIFY_SOURCE 2
      21  #include <malloc.h>
      22  #include <string.h>
      23  #include <support/check.h>
      24  #include <support/xunistd.h>
      25  #include <unistd.h>
      26  
      27  static int
      28  do_test (void)
      29  {
      30    /* The test below assumes that pvalloc rounds up the allocation size
      31       to at least 8.  */
      32    TEST_VERIFY (xsysconf (_SC_PAGESIZE) >= 8);
      33  
      34    void *p = pvalloc (5);
      35    TEST_VERIFY_EXIT (p != NULL);
      36  
      37    /* This is valid assuming the page size is at least 8 because
      38       pvalloc rounds up the allocation size to a multiple of the page
      39       size.  Due to bug 25041, this used to trigger a compiler
      40       warning.  */
      41    strcpy (p, "abcdefg");
      42  
      43    asm ("" : : "g" (p) : "memory"); /* Optimization barrier.  */
      44    TEST_VERIFY (malloc_usable_size (p) >= xsysconf (_SC_PAGESIZE));
      45    return 0;
      46  }
      47  
      48  #include <support/test-driver.c>