| 1 | /* Verify that backtrace does not deadlock on itself on memory corruption. |
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| 2 | Copyright (C) 2015-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <signal.h> |
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| 20 | #include <stdlib.h> |
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| 21 | |
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| 22 | #include <support/support.h> |
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| 23 | #include <libc-diag.h> |
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| 24 | |
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| 25 | #define SIZE 4096 |
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| 26 | |
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| 27 | /* Wrap free with a function to prevent gcc from optimizing it out. */ |
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| 28 | static void |
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| 29 | __attribute__((noinline)) |
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| 30 | call_free (void *ptr) |
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| 31 | { |
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| 32 | free (ptr: ptr); |
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| 33 | #if __GNUC_PREREQ (12, 0) |
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| 34 | /* Ignore a valid warning about using a pointer made indeterminate |
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| 35 | by a prior call to free(). */ |
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| 36 | DIAG_IGNORE_NEEDS_COMMENT (12, "-Wuse-after-free" ); |
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| 37 | #endif |
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| 38 | *(size_t *)(ptr - sizeof (size_t)) = 1; |
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| 39 | #if __GNUC_PREREQ (12, 0) |
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| 40 | DIAG_POP_NEEDS_COMMENT; |
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| 41 | #endif |
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| 42 | } |
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| 43 | |
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| 44 | int |
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| 45 | do_test (void) |
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| 46 | { |
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| 47 | void *ptr1 = malloc (SIZE); |
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| 48 | void *ptr2 = malloc (SIZE); |
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| 49 | |
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| 50 | /* Avoid unwanted output to TTY after an expected memory corruption. */ |
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| 51 | ignore_stderr(); |
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| 52 | |
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| 53 | call_free (ptr: ptr1); |
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| 54 | ptr1 = malloc (SIZE); |
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| 55 | |
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| 56 | /* Not reached. The return statement is to put ptr2 into use so that gcc |
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| 57 | doesn't optimize out that malloc call. */ |
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| 58 | return (ptr1 == ptr2); |
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| 59 | } |
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| 60 | |
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| 61 | #define EXPECTED_SIGNAL SIGABRT |
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| 62 | #include <support/test-driver.c> |
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| 63 | |
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