| 1 | /* Test to verify that realpath() doesn't cause false positives due |
|---|
| 2 | to GCC attribute malloc. |
|---|
| 3 | |
|---|
| 4 | Test failure exposes the presence of the attribute in the following |
|---|
| 5 | declaration: |
|---|
| 6 | |
|---|
| 7 | __attribute__ ((__malloc__ (free, 1))) char* |
|---|
| 8 | realpath (const char *, char *); |
|---|
| 9 | |
|---|
| 10 | Copyright (C) 2021-2022 Free Software Foundation, Inc. |
|---|
| 11 | This file is part of the GNU C Library. |
|---|
| 12 | |
|---|
| 13 | The GNU C Library is free software; you can redistribute it and/or |
|---|
| 14 | modify it under the terms of the GNU Lesser General Public |
|---|
| 15 | License as published by the Free Software Foundation; either |
|---|
| 16 | version 2.1 of the License, or (at your option) any later version. |
|---|
| 17 | |
|---|
| 18 | The GNU C Library is distributed in the hope that it will be useful, |
|---|
| 19 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|---|
| 21 | Lesser General Public License for more details. |
|---|
| 22 | |
|---|
| 23 | You should have received a copy of the GNU Lesser General Public |
|---|
| 24 | License along with the GNU C Library; if not, see |
|---|
| 25 | <https://www.gnu.org/licenses/>. */ |
|---|
| 26 | |
|---|
| 27 | #include <stdio.h> |
|---|
| 28 | #include <stdlib.h> |
|---|
| 29 | #include <malloc.h> |
|---|
| 30 | |
|---|
| 31 | #if defined __GNUC__ && __GNUC__ >= 11 |
|---|
| 32 | /* Turn GCC -Wmismatched-dealloc warnings into errors to expose false |
|---|
| 33 | positives. */ |
|---|
| 34 | # pragma GCC diagnostic push |
|---|
| 35 | # pragma GCC diagnostic error "-Wmismatched-dealloc" |
|---|
| 36 | |
|---|
| 37 | /* Associate dealloc as the only deallocator suitable for pointers |
|---|
| 38 | returned from alloc. |
|---|
| 39 | GCC automatically disables inlining of allocator and deallocator |
|---|
| 40 | functions marked with the argument form of attribute malloc but |
|---|
| 41 | it doesn't hurt to disable it explicitly. */ |
|---|
| 42 | __attribute ((noipa)) void dealloc (void *); |
|---|
| 43 | __attribute ((malloc (dealloc, 1))) char* alloc (void); |
|---|
| 44 | #endif |
|---|
| 45 | |
|---|
| 46 | void dealloc (void *p) |
|---|
| 47 | { |
|---|
| 48 | free (ptr: p); |
|---|
| 49 | } |
|---|
| 50 | |
|---|
| 51 | char* alloc (void) |
|---|
| 52 | { |
|---|
| 53 | return (char *)malloc (size: 8); |
|---|
| 54 | } |
|---|
| 55 | |
|---|
| 56 | static int |
|---|
| 57 | do_test (void) |
|---|
| 58 | { |
|---|
| 59 | char *resolved_path = alloc (); |
|---|
| 60 | char *ret = realpath (name: "/" , resolved: resolved_path); |
|---|
| 61 | dealloc (p: ret); |
|---|
| 62 | |
|---|
| 63 | resolved_path = alloc (); |
|---|
| 64 | ret = realpath (name: "/" , resolved: resolved_path); |
|---|
| 65 | dealloc (p: resolved_path); |
|---|
| 66 | |
|---|
| 67 | /* The following should emit a warning (but doesn't with GCC 11): |
|---|
| 68 | resolved_path = alloc (); |
|---|
| 69 | ret = realpath ("/", resolved_path); |
|---|
| 70 | free (ret); // expect -Wmismatched-dealloc |
|---|
| 71 | */ |
|---|
| 72 | |
|---|
| 73 | return 0; |
|---|
| 74 | } |
|---|
| 75 | |
|---|
| 76 | #if defined __GNUC__ && __GNUC__ >= 11 |
|---|
| 77 | /* Restore -Wmismatched-dealloc setting. */ |
|---|
| 78 | # pragma GCC diagnostic pop |
|---|
| 79 | #endif |
|---|
| 80 | |
|---|
| 81 | #define TEST_FUNCTION do_test () |
|---|
| 82 | #include "../test-skeleton.c" |
|---|
| 83 | |
|---|
