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fada901819
Calling free directly may end up freeing a pointer allocated by the dynamic loader using malloc from libc.so in the base namespace using the allocator from libc.so in a secondary namespace, which results in crashes. This commit redirects the free call through GLRO and the dynamic linker, to reach the correct namespace. It also cleans up the dlerror handling along the way, so that pthread_setspecific is no longer needed (which avoids triggering bug 24774).
46 lines
1.8 KiB
C
46 lines
1.8 KiB
C
/* Free resources stored in thread-local variables on thread exit.
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Copyright (C) 2003-2021 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 <dlfcn/dlerror.h>
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#include <libc-internal.h>
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#include <malloc-internal.h>
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#include <resolv/resolv-internal.h>
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#include <rpc/rpc.h>
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#include <string.h>
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#include <tls-internal.h>
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#include <shlib-compat.h>
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/* Thread shutdown function. Note that this function must be called
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for threads during shutdown for correctness reasons. Unlike
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__libc_subfreeres, skipping calls to it is not a valid optimization.
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This is called directly from pthread_create as the thread exits. */
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void
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__libc_thread_freeres (void)
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{
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_32)
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__rpc_thread_destroy ();
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#endif
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call_function_static_weak (__res_thread_freeres);
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__glibc_tls_internal_free ();
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call_function_static_weak (__libc_dlerror_result_free);
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/* This should come last because it shuts down malloc for this
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thread and the other shutdown functions might well call free. */
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call_function_static_weak (__malloc_arena_thread_freeres);
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}
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