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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>
191 lines
7.5 KiB
C
191 lines
7.5 KiB
C
/* Copyright (C) 1997-2023 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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#include <array_length.h>
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#include <atomic.h>
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#include <stdlib.h>
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#include <libc-internal.h>
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#include <unwind-link.h>
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#include <ldsodefs.h>
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#include <set-freeres.h>
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#include <set-freeres-system.h>
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#ifndef SHARED
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# pragma weak __nss_module_freeres
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# pragma weak __nss_action_freeres
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# pragma weak __nss_database_freeres
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# pragma weak __dl_libc_freemem
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# pragma weak __hdestroy
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# pragma weak __gconv_cache_freemem
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# pragma weak __gconv_conf_freemem
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# pragma weak __gconv_db_freemem
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# pragma weak __gconv_dl_freemem
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# pragma weak __intl_freemem
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# pragma weak __libio_freemem
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# pragma weak __libc_fstab_freemem
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# pragma weak __nscd_gr_map_freemem
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# pragma weak __nscd_hst_map_freemem
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# pragma weak __nscd_pw_map_freemem
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# pragma weak __nscd_serv_map_freemem
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# pragma weak __nscd_group_map_freemem
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# pragma weak __libc_regcomp_freemem
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# pragma weak __libc_atfork_freemem
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# pragma weak __res_thread_freeres
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# pragma weak __libc_resolv_conf_freemem
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# pragma weak __libc_printf_freemem
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# pragma weak __libc_fmtmsg_freemem
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# pragma weak __libc_setenv_freemem
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# pragma weak __rpc_freemem
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# pragma weak __rpc_thread_destroy
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# pragma weak __libc_getaddrinfo_freemem
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# pragma weak __libc_tzset_freemem
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# pragma weak __libc_localealias_freemem
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# pragma weak __gai_freemem
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# pragma weak __aio_freemem
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# pragma weak __libpthread_freeres
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# pragma weak __libc_dlerror_result_free
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# pragma weak __check_pf_freemem
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#endif
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#ifdef SHARED
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# define call_free_static_weak(__ptr) \
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free (__ptr)
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#else
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# define call_free_static_weak(__ptr) \
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if (&__ptr != NULL) \
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free (__ptr);
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#endif
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void
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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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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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call_function_static_weak (__dl_libc_freemem);
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call_function_static_weak (__hdestroy);
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call_function_static_weak (__gconv_cache_freemem);
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call_function_static_weak (__gconv_conf_freemem);
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call_function_static_weak (__gconv_db_freemem);
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call_function_static_weak (__gconv_dl_freemem);
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call_function_static_weak (__intl_freemem);
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call_function_static_weak (__libio_freemem);
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call_function_static_weak (__libc_fstab_freemem);
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call_function_static_weak (__nscd_gr_map_freemem);
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call_function_static_weak (__nscd_hst_map_freemem);
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call_function_static_weak (__nscd_pw_map_freemem);
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call_function_static_weak (__nscd_serv_map_freemem);
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call_function_static_weak (__nscd_group_map_freemem);
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call_function_static_weak (__libc_regcomp_freemem);
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call_function_static_weak (__libc_atfork_freemem);
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/* __res_thread_freeres deallocates the per-thread resolv_context);
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which in turn drop the reference count of the current global object.
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So it need to be before __libc_resolv_conf_freemem. */
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call_function_static_weak (__res_thread_freeres);
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call_function_static_weak (__libc_resolv_conf_freemem);
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call_function_static_weak (__libc_printf_freemem);
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call_function_static_weak (__libc_fmtmsg_freemem);
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call_function_static_weak (__libc_setenv_freemem);
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_31)
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call_function_static_weak (__rpc_freemem);
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call_function_static_weak (__rpc_thread_destroy);
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#endif
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call_function_static_weak (__libc_getaddrinfo_freemem);
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call_function_static_weak (__libc_tzset_freemem);
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call_function_static_weak (__libc_localealias_freemem);
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#if PTHREAD_IN_LIBC
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call_function_static_weak (__gai_freemem);
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call_function_static_weak (__aio_freemem);
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#endif
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call_function_static_weak (__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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call_function_static_weak (__libc_dlerror_result_free);
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#ifdef SHARED
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GLRO (dl_libc_freeres) ();
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#endif
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call_free_static_weak (__libc_fgetgrent_freemem_ptr);
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call_free_static_weak (__libc_fgetsgent_freeres_ptr);
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call_free_static_weak (__libc_getnetgrent_freemem_ptr);
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call_free_static_weak (__libc_rcmd_freemem_ptr);
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call_free_static_weak (__libc_rexec_freemem_ptr);
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call_free_static_weak (__libc_mntent_freemem_ptr);
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call_free_static_weak (__libc_fgetpwent_freemem_ptr);
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call_free_static_weak (__libc_resolv_res_hconf_freemem_ptr);
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call_free_static_weak (__libc_fgetspent_freemem_ptr);
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call_free_static_weak (__libc_tzfile_freemem_ptr);
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call_free_static_weak (__libc_getnameinfo_freemem_ptr);
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call_free_static_weak (__libc_getutent_freemem_ptr);
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call_free_static_weak (__libc_getutid_freemem_ptr);
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call_free_static_weak (__libc_getutline_freemem_ptr);
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call_free_static_weak (__libc_reg_printf_freemem_ptr);
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call_free_static_weak (__libc_reg_type_freemem_ptr);
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call_free_static_weak (__libc_getgrgid_freemem_ptr);
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call_free_static_weak (__libc_getgrnam_freemem_ptr);
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call_free_static_weak (__libc_getpwnam_freemem_ptr);
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call_free_static_weak (__libc_getpwuid_freemem_ptr);
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call_free_static_weak (__libc_getspnam_freemem_ptr);
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call_free_static_weak (__libc_getaliasbyname_freemem_ptr);
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call_free_static_weak (__libc_gethostbyaddr_freemem_ptr);
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call_free_static_weak (__libc_gethostbyname_freemem_ptr);
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call_free_static_weak (__libc_gethostbyname2_freemem_ptr);
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call_free_static_weak (__libc_getnetbyaddr_freemem_ptr);
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call_free_static_weak (__libc_getnetbyname_freemem_ptr);
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call_free_static_weak (__libc_getprotobynumber_freemem_ptr);
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call_free_static_weak (__libc_getprotobyname_freemem_ptr);
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call_free_static_weak (__libc_getrpcbyname_freemem_ptr);
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call_free_static_weak (__libc_getrpcbynumber_freemem_ptr);
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call_free_static_weak (__libc_getservbyname_freemem_ptr);
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call_free_static_weak (__libc_getservbyport_freemem_ptr);
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call_free_static_weak (__libc_getgrent_freemem_ptr);
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call_free_static_weak (__libc_getpwent_freemem_ptr);
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call_free_static_weak (__libc_getspent_freemem_ptr);
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call_free_static_weak (__libc_getaliasent_freemem_ptr);
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call_free_static_weak (__libc_gethostent_freemem_ptr);
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call_free_static_weak (__libc_getnetent_freemem_ptr);
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call_free_static_weak (__libc_getprotoent_freemem_ptr);
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call_free_static_weak (__libc_getrpcent_freemem_ptr);
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call_free_static_weak (__libc_getservent_freemem_ptr);
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call_free_static_weak (__libc_efgcvt_freemem_ptr);
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call_free_static_weak (__libc_qefgcvt_freemem_ptr);
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call_freeres_system_funcs;
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}
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}
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libc_hidden_def (__libc_freeres)
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