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88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/* Test to verify that realpath() doesn't cause false positives due
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to GCC attribute malloc.
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Test failure exposes the presence of the attribute in the following
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declaration:
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__attribute__ ((__malloc__ (free, 1))) char*
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realpath (const char *, char *);
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Copyright (C) 2021-2025 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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<https://www.gnu.org/licenses/>. */
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <malloc.h>
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#if defined __GNUC__ && __GNUC__ >= 11
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/* Turn GCC -Wmismatched-dealloc warnings into errors to expose false
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positives. */
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# pragma GCC diagnostic push
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# pragma GCC diagnostic error "-Wmismatched-dealloc"
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/* Associate dealloc as the only deallocator suitable for pointers
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returned from alloc.
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GCC automatically disables inlining of allocator and deallocator
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functions marked with the argument form of attribute malloc but
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it doesn't hurt to disable it explicitly. */
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__attribute ((noipa)) void dealloc (void *);
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__attribute ((malloc (dealloc, 1))) char* alloc (void);
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#endif
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void dealloc (void *p)
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{
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free (p);
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}
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char* alloc (void)
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{
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#ifdef PATH_MAX
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return (char *)malloc (PATH_MAX);
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#else
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return (char *)malloc (4096);
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#endif
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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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char *resolved_path = alloc ();
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char *ret = realpath ("/", resolved_path);
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dealloc (ret);
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resolved_path = alloc ();
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ret = realpath ("/", resolved_path);
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dealloc (resolved_path);
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/* The following should emit a warning (but doesn't with GCC 11):
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resolved_path = alloc ();
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ret = realpath ("/", resolved_path);
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free (ret); // expect -Wmismatched-dealloc
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*/
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return 0;
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}
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#if defined __GNUC__ && __GNUC__ >= 11
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/* Restore -Wmismatched-dealloc setting. */
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# pragma GCC diagnostic pop
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#endif
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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