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b8dd0f4278
* malloc/malloc.c (tcache_entry): Add key field. (tcache_put): Set it. (tcache_get): Likewise. (_int_free): Check for double free in tcache. * malloc/tst-tcfree1.c: New. * malloc/tst-tcfree2.c: New. * malloc/Makefile: Run the new tests. * manual/probes.texi: Document memory_tcache_double_free probe. * dlfcn/dlerror.c (check_free): Prevent double frees. (cherry picked from commitbcdaad21d4) malloc: tcache: Validate tc_idx before checking for double-frees [BZ #23907] The previous check could read beyond the end of the tcache entry array. If the e->key == tcache cookie check happened to pass, this would result in crashes. (cherry picked from commitaffec03b71)
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/* Test that malloc tcache catches double free.
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Copyright (C) 2018 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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<http://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 <sys/signal.h>
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static int
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do_test (void)
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{
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char * volatile ptrs[20];
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int i;
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/* Allocate enough small chunks so that when we free them all, the tcache
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is full, and the first one we freed is at the end of its linked list. */
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#define COUNT 20
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for (i=0; i<COUNT; i++)
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ptrs[i] = malloc (20);
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for (i=0; i<COUNT; i++)
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free (ptrs[i]);
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free (ptrs[0]);
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printf("FAIL: tcache double free\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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