mirror of git://sourceware.org/git/glibc.git
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* Test that malloc tcache catches double free.
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Copyright (C) 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 <errno.h>
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#include <error.h>
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#include <limits.h>
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#include <malloc.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 <sys/signal.h>
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/* Test for a double free where the size information gets overwritten by a
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* terminating null byte. */
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static int
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do_test (void)
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{
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/* The payload is exactly 0x19 Bytes long:
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* 0x18 bytes 'B' and one terminating null byte
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*/
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const char *payload = "BBBBBBBBBBBBBBBBBBBBBBBB";
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char *volatile first_chunk
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= malloc (strlen (payload)); // <-- off by one error
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char *volatile second_chunk = malloc (0x118);
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// free the second chunk the first time now it is in the tcache with tc_idx =
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free (second_chunk);
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// change the the size of the second_chunk using the terminating null byte if
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// the PAYLOAD
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strcpy (first_chunk, payload);
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// now the second_chunk has a new size
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// calling free a second time will not trigger the double free detection
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free (second_chunk);
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printf ("FAIL: tcache double free not detected\n");
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return 1;
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}
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#define TEST_FUNCTION do_test
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#define EXPECTED_SIGNAL SIGABRT
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#include <support/test-driver.c>
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