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9fc813e1a3
This will be used to consolidate the libgcc_s access for backtrace and pthread_cancel. Unlike the existing backtrace implementations, it provides some hardening based on pointer mangling. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/* Copyright (C) 1997-2021 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 <atomic.h>
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#include <stdlib.h>
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#include <set-hooks.h>
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#include <libc-internal.h>
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#include <unwind-link.h>
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#include "../nss/nsswitch.h"
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#include "../libio/libioP.h"
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DEFINE_HOOK (__libc_subfreeres, (void));
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symbol_set_define (__libc_freeres_ptrs);
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extern __attribute__ ((weak)) void __libdl_freeres (void);
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extern __attribute__ ((weak)) void __libpthread_freeres (void);
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void __libc_freeres_fn_section
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__libc_freeres (void)
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{
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/* This function might be called from different places. So better
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protect for multiple executions since these are fatal. */
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static long int already_called;
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if (!atomic_compare_and_exchange_bool_acq (&already_called, 1, 0))
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{
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void *const *p;
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call_function_static_weak (__nss_module_freeres);
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call_function_static_weak (__nss_action_freeres);
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call_function_static_weak (__nss_database_freeres);
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_IO_cleanup ();
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/* We run the resource freeing after IO cleanup. */
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RUN_HOOK (__libc_subfreeres, ());
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/* Call the libdl list of cleanup functions
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(weak-ref-and-check). */
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if (&__libdl_freeres != NULL)
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__libdl_freeres ();
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/* Call the libpthread list of cleanup functions
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(weak-ref-and-check). */
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if (&__libpthread_freeres != NULL)
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__libpthread_freeres ();
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#ifdef SHARED
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__libc_unwind_link_freeres ();
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#endif
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for (p = symbol_set_first_element (__libc_freeres_ptrs);
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!symbol_set_end_p (__libc_freeres_ptrs, p); ++p)
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free (*p);
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}
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}
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libc_hidden_def (__libc_freeres)
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