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88677348b4
They are both used by __libc_freeres to free all library malloc allocated resources to help tooling like mtrace or valgrind with memory leak tracking. The current scheme uses assembly markers and linker script entries to consolidate the free routine function pointers in the RELRO segment and to be freed buffers in BSS. This patch changes it to use specific free functions for libc_freeres_ptrs buffers and call the function pointer array directly with call_function_static_weak. It allows the removal of both the internal macros and the linker script sections. Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/* Memory management for dlerror messages.
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Copyright (C) 2021-2023 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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#ifndef _DLERROR_H
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#define _DLERROR_H
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#include <dlfcn.h>
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#include <ldsodefs.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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/* Source of the errstring member in struct dl_action_result, for
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finding the right deallocation routine. */
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enum dl_action_result_errstring_source
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{
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dl_action_result_errstring_constant, /* String literal, no deallocation. */
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dl_action_result_errstring_rtld, /* libc in the primary namespace. */
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dl_action_result_errstring_local, /* libc in the current namespace. */
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};
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struct dl_action_result
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{
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int errcode;
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char errstring_source;
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bool returned;
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const char *objname;
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char *errstring;
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};
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/* Used to free the errstring member of struct dl_action_result in the
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dl_action_result_errstring_rtld case. */
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static inline void
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dl_error_free (void *ptr)
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{
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#ifdef SHARED
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/* In the shared case, ld.so may use a different malloc than this
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namespace. */
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GLRO (dl_error_free (ptr));
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#else
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/* Call the implementation directly. It still has to check for
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pointers which cannot be freed, so do not call free directly
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here. */
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_dl_error_free (ptr);
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#endif
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}
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/* Deallocate RESULT->errstring, leaving *RESULT itself allocated. */
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static inline void
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dl_action_result_errstring_free (struct dl_action_result *result)
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{
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switch (result->errstring_source)
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{
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case dl_action_result_errstring_constant:
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break;
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case dl_action_result_errstring_rtld:
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dl_error_free (result->errstring);
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break;
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case dl_action_result_errstring_local:
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free (result->errstring);
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break;
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}
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}
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/* Stand-in for an error result object whose allocation failed. No
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precise message can be reported for this, but an error must still
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be signaled. */
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static struct dl_action_result *const dl_action_result_malloc_failed
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__attribute__ ((unused)) = (struct dl_action_result *) (intptr_t) -1;
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/* Thread-local variable for storing dlfcn failures for subsequent
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reporting via dlerror. */
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extern __thread struct dl_action_result *__libc_dlerror_result
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attribute_tls_model_ie;
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#endif /* _DLERROR_H */
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