diff options
Diffstat (limited to 'elf/dl-support.c')
| -rw-r--r-- | elf/dl-support.c | 389 |
1 files changed, 0 insertions, 389 deletions
diff --git a/elf/dl-support.c b/elf/dl-support.c deleted file mode 100644 index c22be854f4..0000000000 --- a/elf/dl-support.c +++ /dev/null @@ -1,389 +0,0 @@ -/* Support for dynamic linking code in static libc. - Copyright (C) 1996-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -/* This file defines some things that for the dynamic linker are defined in - rtld.c and dl-sysdep.c in ways appropriate to bootstrap dynamic linking. */ - -#include <errno.h> -#include <libintl.h> -#include <stdlib.h> -#include <unistd.h> -#include <sys/param.h> -#include <stdint.h> -#include <ldsodefs.h> -#include <dl-machine.h> -#include <libc-lock.h> -#include <dl-cache.h> -#include <dl-librecon.h> -#include <dl-procinfo.h> -#include <unsecvars.h> -#include <hp-timing.h> -#include <stackinfo.h> - -extern char *__progname; -char **_dl_argv = &__progname; /* This is checked for some error messages. */ - -/* Name of the architecture. */ -const char *_dl_platform; -size_t _dl_platformlen; - -int _dl_debug_mask; -int _dl_lazy; -ElfW(Addr) _dl_use_load_bias = -2; -int _dl_dynamic_weak; - -/* If nonzero print warnings about problematic situations. */ -int _dl_verbose; - -/* We never do profiling. */ -const char *_dl_profile; -const char *_dl_profile_output; - -/* Names of shared object for which the RUNPATHs and RPATHs should be - ignored. */ -const char *_dl_inhibit_rpath; - -/* The map for the object we will profile. */ -struct link_map *_dl_profile_map; - -/* This is the address of the last stack address ever used. */ -void *__libc_stack_end; - -/* Path where the binary is found. */ -const char *_dl_origin_path; - -/* Nonzero if runtime lookup should not update the .got/.plt. */ -int _dl_bind_not; - -/* A dummy link map for the executable, used by dlopen to access the global - scope. We don't export any symbols ourselves, so this can be minimal. */ -static struct link_map _dl_main_map = - { - .l_name = (char *) "", - .l_real = &_dl_main_map, - .l_ns = LM_ID_BASE, - .l_libname = &(struct libname_list) { .name = "", .dont_free = 1 }, - .l_searchlist = - { - .r_list = &(struct link_map *) { &_dl_main_map }, - .r_nlist = 1, - }, - .l_symbolic_searchlist = { .r_list = &(struct link_map *) { NULL } }, - .l_type = lt_executable, - .l_scope_mem = { &_dl_main_map.l_searchlist }, - .l_scope_max = (sizeof (_dl_main_map.l_scope_mem) - / sizeof (_dl_main_map.l_scope_mem[0])), - .l_scope = _dl_main_map.l_scope_mem, - .l_local_scope = { &_dl_main_map.l_searchlist }, - .l_used = 1, - .l_tls_offset = NO_TLS_OFFSET, - .l_serial = 1, - }; - -/* Namespace information. */ -struct link_namespaces _dl_ns[DL_NNS] = - { - [LM_ID_BASE] = - { - ._ns_loaded = &_dl_main_map, - ._ns_nloaded = 1, - ._ns_main_searchlist = &_dl_main_map.l_searchlist, - } - }; -size_t _dl_nns = 1; - -/* Incremented whenever something may have been added to dl_loaded. */ -unsigned long long _dl_load_adds = 1; - -/* Fake scope of the main application. */ -struct r_scope_elem _dl_initial_searchlist = - { - .r_list = &(struct link_map *) { &_dl_main_map }, - .r_nlist = 1, - }; - -#ifndef HAVE_INLINED_SYSCALLS -/* Nonzero during startup. */ -int _dl_starting_up = 1; -#endif - -/* Random data provided by the kernel. */ -void *_dl_random; - -/* Get architecture specific initializer. */ -#include <dl-procinfo.c> - -/* Initial value of the CPU clock. */ -#ifndef HP_TIMING_NONAVAIL -hp_timing_t _dl_cpuclock_offset; -#endif - -void (*_dl_init_static_tls) (struct link_map *) = &_dl_nothread_init_static_tls; - -size_t _dl_pagesize = EXEC_PAGESIZE; - -int _dl_inhibit_cache; - -unsigned int _dl_osversion; - -/* All known directories in sorted order. */ -struct r_search_path_elem *_dl_all_dirs; - -/* All directories after startup. */ -struct r_search_path_elem *_dl_init_all_dirs; - -/* The object to be initialized first. */ -struct link_map *_dl_initfirst; - -/* Descriptor to write debug messages to. */ -int _dl_debug_fd = STDERR_FILENO; - -int _dl_correct_cache_id = _DL_CACHE_DEFAULT_ID; - -ElfW(auxv_t) *_dl_auxv; -const ElfW(Phdr) *_dl_phdr; -size_t _dl_phnum; -uint64_t _dl_hwcap __attribute__ ((nocommon)); -uint64_t _dl_hwcap2 __attribute__ ((nocommon)); - -/* The value of the FPU control word the kernel will preset in hardware. */ -fpu_control_t _dl_fpu_control = _FPU_DEFAULT; - -#if !HAVE_TUNABLES -/* This is not initialized to HWCAP_IMPORTANT, matching the definition - of _dl_important_hwcaps, below, where no hwcap strings are ever - used. This mask is still used to mediate the lookups in the cache - file. Since there is no way to set this nonzero (we don't grok the - LD_HWCAP_MASK environment variable here), there is no real point in - setting _dl_hwcap nonzero below, but we do anyway. */ -uint64_t _dl_hwcap_mask __attribute__ ((nocommon)); -#endif - -/* Prevailing state of the stack. Generally this includes PF_X, indicating it's - * executable but this isn't true for all platforms. */ -ElfW(Word) _dl_stack_flags = DEFAULT_STACK_PERMS; - -/* If loading a shared object requires that we make the stack executable - when it was not, we do it by calling this function. - It returns an errno code or zero on success. */ -int (*_dl_make_stack_executable_hook) (void **) internal_function - = _dl_make_stack_executable; - - -/* Function in libpthread to wait for termination of lookups. */ -void (*_dl_wait_lookup_done) (void); - -struct dl_scope_free_list *_dl_scope_free_list; - -#ifdef NEED_DL_SYSINFO -/* Needed for improved syscall handling on at least x86/Linux. */ -uintptr_t _dl_sysinfo = DL_SYSINFO_DEFAULT; -#endif -#ifdef NEED_DL_SYSINFO_DSO -/* Address of the ELF headers in the vsyscall page. */ -const ElfW(Ehdr) *_dl_sysinfo_dso; - -struct link_map *_dl_sysinfo_map; - -# include "get-dynamic-info.h" -#endif -#include "setup-vdso.h" - -/* During the program run we must not modify the global data of - loaded shared object simultanously in two threads. Therefore we - protect `_dl_open' and `_dl_close' in dl-close.c. - - This must be a recursive lock since the initializer function of - the loaded object might as well require a call to this function. - At this time it is not anymore a problem to modify the tables. */ -__rtld_lock_define_initialized_recursive (, _dl_load_lock) -/* This lock is used to keep __dl_iterate_phdr from inspecting the - list of loaded objects while an object is added to or removed from - that list. */ -__rtld_lock_define_initialized_recursive (, _dl_load_write_lock) - - -#ifdef HAVE_AUX_VECTOR -int _dl_clktck; - -void -internal_function -_dl_aux_init (ElfW(auxv_t) *av) -{ - int seen = 0; - uid_t uid = 0; - gid_t gid = 0; - - _dl_auxv = av; - for (; av->a_type != AT_NULL; ++av) - switch (av->a_type) - { - case AT_PAGESZ: - if (av->a_un.a_val != 0) - GLRO(dl_pagesize) = av->a_un.a_val; - break; - case AT_CLKTCK: - GLRO(dl_clktck) = av->a_un.a_val; - break; - case AT_PHDR: - GL(dl_phdr) = (const void *) av->a_un.a_val; - break; - case AT_PHNUM: - GL(dl_phnum) = av->a_un.a_val; - break; - case AT_PLATFORM: - GLRO(dl_platform) = (void *) av->a_un.a_val; - break; - case AT_HWCAP: - GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val; - break; - case AT_HWCAP2: - GLRO(dl_hwcap2) = (unsigned long int) av->a_un.a_val; - break; - case AT_FPUCW: - GLRO(dl_fpu_control) = av->a_un.a_val; - break; -#ifdef NEED_DL_SYSINFO - case AT_SYSINFO: - GL(dl_sysinfo) = av->a_un.a_val; - break; -#endif -#ifdef NEED_DL_SYSINFO_DSO - case AT_SYSINFO_EHDR: - GL(dl_sysinfo_dso) = (void *) av->a_un.a_val; - break; -#endif - case AT_UID: - uid ^= av->a_un.a_val; - seen |= 1; - break; - case AT_EUID: - uid ^= av->a_un.a_val; - seen |= 2; - break; - case AT_GID: - gid ^= av->a_un.a_val; - seen |= 4; - break; - case AT_EGID: - gid ^= av->a_un.a_val; - seen |= 8; - break; - case AT_SECURE: - seen = -1; - __libc_enable_secure = av->a_un.a_val; - __libc_enable_secure_decided = 1; - break; - case AT_RANDOM: - _dl_random = (void *) av->a_un.a_val; - break; -# ifdef DL_PLATFORM_AUXV - DL_PLATFORM_AUXV -# endif - } - if (seen == 0xf) - { - __libc_enable_secure = uid != 0 || gid != 0; - __libc_enable_secure_decided = 1; - } -} -#endif - - -void -internal_function -_dl_non_dynamic_init (void) -{ - _dl_main_map.l_origin = _dl_get_origin (); - _dl_main_map.l_phdr = GL(dl_phdr); - _dl_main_map.l_phnum = GL(dl_phnum); - - if (HP_SMALL_TIMING_AVAIL) - HP_TIMING_NOW (_dl_cpuclock_offset); - - _dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1; - - /* Set up the data structures for the system-supplied DSO early, - so they can influence _dl_init_paths. */ - setup_vdso (NULL, NULL); - - /* Initialize the data structures for the search paths for shared - objects. */ - _dl_init_paths (getenv ("LD_LIBRARY_PATH")); - - /* Remember the last search directory added at startup. */ - _dl_init_all_dirs = GL(dl_all_dirs); - - _dl_lazy = *(getenv ("LD_BIND_NOW") ?: "") == '\0'; - - _dl_bind_not = *(getenv ("LD_BIND_NOT") ?: "") != '\0'; - - _dl_dynamic_weak = *(getenv ("LD_DYNAMIC_WEAK") ?: "") == '\0'; - - _dl_profile_output = getenv ("LD_PROFILE_OUTPUT"); - if (_dl_profile_output == NULL || _dl_profile_output[0] == '\0') - _dl_profile_output - = &"/var/tmp\0/var/profile"[__libc_enable_secure ? 9 : 0]; - - if (__libc_enable_secure) - { - static const char unsecure_envvars[] = - UNSECURE_ENVVARS -#ifdef EXTRA_UNSECURE_ENVVARS - EXTRA_UNSECURE_ENVVARS -#endif - ; - const char *cp = unsecure_envvars; - - while (cp < unsecure_envvars + sizeof (unsecure_envvars)) - { - __unsetenv (cp); - cp = (const char *) __rawmemchr (cp, '\0') + 1; - } - -#if !HAVE_TUNABLES - if (__access ("/etc/suid-debug", F_OK) != 0) - __unsetenv ("MALLOC_CHECK_"); -#endif - } - -#ifdef DL_PLATFORM_INIT - DL_PLATFORM_INIT; -#endif - -#ifdef DL_OSVERSION_INIT - DL_OSVERSION_INIT; -#endif - - /* Now determine the length of the platform string. */ - if (_dl_platform != NULL) - _dl_platformlen = strlen (_dl_platform); - - /* Scan for a program header telling us the stack is nonexecutable. */ - if (_dl_phdr != NULL) - for (uint_fast16_t i = 0; i < _dl_phnum; ++i) - if (_dl_phdr[i].p_type == PT_GNU_STACK) - { - _dl_stack_flags = _dl_phdr[i].p_flags; - break; - } -} - -#ifdef DL_SYSINFO_IMPLEMENTATION -DL_SYSINFO_IMPLEMENTATION -#endif |