* Program to load an ELF binary on a linux system, and run it
* after resolving ELF shared library symbols
*
- * Copyright (C) 2000-2004 by Erik Andersen <andersen@codpoet.org>
+ * Copyright (C) 2005 by Joakim Tjernlund
+ * Copyright (C) 2000-2006 by Erik Andersen <andersen@codepoet.org>
* Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
* David Engel, Hongjiu Lu and Mitch D'Souza
*
* SUCH DAMAGE.
*/
-
#include "ldso.h"
+#include "unsecvars.h"
+
+/* Pull in common debug code */
+#include "dl-debug.c"
#define ALLOW_ZERO_PLTGOT
+#if defined(USE_TLS) && USE_TLS
+#include "dl-tls.c"
+#endif
+
/* Pull in the value of _dl_progname */
-#include "_dl_progname.h"
+#include LDSO_ELFINTERP
/* Global variables used within the shared library loader */
-char *_dl_library_path = 0; /* Where we look for libraries */
-char *_dl_preload = 0; /* Things to be loaded before the libs */
-char *_dl_ldsopath = 0; /* Location of the shared lib loader */
-unsigned char *_dl_malloc_addr = 0; /* Lets _dl_malloc use the already allocated memory page */
-unsigned char *_dl_mmap_zero = 0; /* Also used by _dl_malloc */
-unsigned long *_dl_brkp = 0; /* The end of the data segment for brk and sbrk */
-unsigned long *_dl_envp = 0; /* The environment address */
-int _dl_secure = 1; /* Are we dealing with setuid stuff? */
-
-
+#ifdef __LDSO_LD_LIBRARY_PATH__
+char *_dl_library_path = NULL; /* Where we look for libraries */
+#endif
+#ifdef __LDSO_PRELOAD_ENV_SUPPORT__
+char *_dl_preload = NULL; /* Things to be loaded before the libs */
+#endif
+int _dl_errno = 0; /* We can't use the real errno in ldso */
+size_t _dl_pagesize = 0; /* Store the page size for use later */
+struct r_debug *_dl_debug_addr = NULL; /* Used to communicate with the gdb debugger */
+void *(*_dl_malloc_function) (size_t size) = NULL;
+void (*_dl_free_function) (void *p) = NULL;
+
+#ifdef __LDSO_PRELINK_SUPPORT__
+char *_dl_trace_prelink = NULL; /* Library for prelinking trace */
+struct elf_resolve *_dl_trace_prelink_map = NULL; /* Library module for prelinking trace */
+bool _dl_verbose = true; /* On by default */
+bool prelinked = false;
+#endif
+static int _dl_secure = 1; /* Are we dealing with setuid stuff? */
#ifdef __SUPPORT_LD_DEBUG__
-char *_dl_debug = 0;
-char *_dl_debug_symbols = 0;
-char *_dl_debug_move = 0;
-char *_dl_debug_reloc = 0;
-char *_dl_debug_detail = 0;
-char *_dl_debug_nofixups = 0;
-char *_dl_debug_bindings = 0;
+char *_dl_debug = NULL;
+char *_dl_debug_symbols = NULL;
+char *_dl_debug_move = NULL;
+char *_dl_debug_reloc = NULL;
+char *_dl_debug_detail = NULL;
+char *_dl_debug_nofixups = NULL;
+char *_dl_debug_bindings = NULL;
int _dl_debug_file = 2;
#endif
-/* Forward function declarations */
-static int _dl_suid_ok(void);
+#if defined (__LDSO_STANDALONE_SUPPORT__) && defined (__sh__)
+/* Not hidden, needed for standalone execution. */
+/*
+ * FIXME: align dl_start for SH to other archs so that we can keep this symbol
+ * hidden and we don't need to handle in __uClibc_main
+ */
+
+unsigned long _dl_skip_args = 0;
+#else
+unsigned long attribute_hidden _dl_skip_args = 0;
+#endif
+
+const char *_dl_progname = UCLIBC_LDSO; /* The name of the executable being run */
+#include "dl-startup.c"
+#include "dl-symbols.c"
+#include "dl-array.c"
/*
* This stub function is used by some debuggers. The idea is that they
* can set an internal breakpoint on it, so that we are notified when the
* address mapping is changed in some way.
*/
+void _dl_debug_state(void);
+rtld_hidden_proto(_dl_debug_state, noinline);
void _dl_debug_state(void)
{
+ /* Make sure GCC doesn't recognize this function as pure, to avoid
+ * having the calls optimized away.
+ */
+ __asm__("");
+}
+rtld_hidden_def(_dl_debug_state);
+
+static unsigned char *_dl_malloc_addr = NULL; /* Lets _dl_malloc use the already allocated memory page */
+static unsigned char *_dl_mmap_zero = NULL; /* Also used by _dl_malloc */
+
+static struct elf_resolve **init_fini_list;
+static struct elf_resolve **scope_elem_list;
+static unsigned int nlist; /* # items in init_fini_list */
+extern void _start(void);
+
+#ifdef __UCLIBC_HAS_SSP__
+# include <dl-osinfo.h>
+static uintptr_t stack_chk_guard;
+# ifndef THREAD_SET_STACK_GUARD
+/* Only exported for architectures that don't store the stack guard canary
+ * in local thread area. */
+uintptr_t __stack_chk_guard attribute_relro;
+# endif
+# ifdef __UCLIBC_HAS_SSP_COMPAT__
+uintptr_t __guard attribute_relro;
+# endif
+#endif
+
+#ifdef __LDSO_SEARCH_INTERP_PATH__
+const char *_dl_ldsopath = NULL; /* Location of the shared lib loader */
+
+static void _dl_ldsopath_init(struct elf_resolve *tpnt)
+{
+ char *ldsopath, *ptmp;
+
+ /*
+ * Store the path where the shared lib loader was found for later use.
+ * Note that this logic isn't bullet proof when it comes to relative
+ * paths: if you use "./lib/ldso.so", and then the app does chdir()
+ * followed by dlopen(), the old ldso path won't get searched. But
+ * that is a fairly pathological use case, so if you don't like that,
+ * then set a full path to your interp and be done :P.
+ */
+ ldsopath = _dl_strdup(tpnt->libname);
+ ptmp = _dl_strrchr(ldsopath, '/');
+ /*
+ * If there is no "/", then set the path to "", and the code
+ * later on will take this to implicitly mean "search $PWD".
+ */
+ if (!ptmp)
+ ptmp = ldsopath;
+ *ptmp = '\0';
+
+ _dl_ldsopath = ldsopath;
+ _dl_debug_early("Lib Loader: (%x) %s: using path: %s\n",
+ (unsigned) DL_LOADADDR_BASE(tpnt->loadaddr), tpnt->libname,
+ _dl_ldsopath);
+}
+#else
+#define _dl_ldsopath_init(tpnt)
+#endif
+
+char *_dl_getenv(const char *symbol, char **envp)
+{
+ char *pnt;
+ const char *pnt1;
+
+ while ((pnt = *envp++)) {
+ pnt1 = symbol;
+ while (*pnt && *pnt == *pnt1)
+ pnt1++, pnt++;
+ if (!*pnt || *pnt != '=' || *pnt1)
+ continue;
+ return pnt + 1;
+ }
+ return 0;
+}
+
+void _dl_unsetenv(const char *symbol, char **envp)
+{
+ char *pnt;
+ const char *pnt1;
+ char **newenvp = envp;
+
+ for (pnt = *envp; pnt; pnt = *++envp) {
+ pnt1 = symbol;
+ while (*pnt && *pnt == *pnt1)
+ pnt1++, pnt++;
+ if (!*pnt || *pnt != '=' || *pnt1)
+ *newenvp++ = *envp;
+ }
+ *newenvp++ = *envp;
+ return;
+}
+
+static int _dl_suid_ok(void)
+{
+ __kernel_uid_t uid, euid;
+ __kernel_gid_t gid, egid;
+
+ uid = _dl_getuid();
+ euid = _dl_geteuid();
+ gid = _dl_getgid();
+ egid = _dl_getegid();
+
+ if (uid == euid && gid == egid) {
+ return 1;
+ }
+ return 0;
}
-/* This global variable is also to communicate with debuggers such as gdb. */
-struct r_debug *_dl_debug_addr = NULL;
+void *_dl_malloc(size_t size)
+{
+ void *retval;
+
+#if 0
+ _dl_debug_early("request for %d bytes\n", size);
+#endif
+
+ if (_dl_malloc_function)
+ return (*_dl_malloc_function) (size);
+
+ if (_dl_malloc_addr - _dl_mmap_zero + size > _dl_pagesize) {
+ size_t rounded_size;
+
+ /* Since the above assumes we get a full page even if
+ we request less than that, make sure we request a
+ full page, since uClinux may give us less than than
+ a full page. We might round even
+ larger-than-a-page sizes, but we end up never
+ reusing _dl_mmap_zero/_dl_malloc_addr in that case,
+ so we don't do it.
+
+ The actual page size doesn't really matter; as long
+ as we're self-consistent here, we're safe. */
+ if (size < _dl_pagesize)
+ rounded_size = (size + ADDR_ALIGN) & _dl_pagesize;
+ else
+ rounded_size = size;
+
+ _dl_debug_early("mmapping more memory\n");
+ _dl_mmap_zero = _dl_malloc_addr = _dl_mmap((void *) 0, rounded_size,
+ PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_UNINITIALIZE, -1, 0);
+ if (_dl_mmap_check_error(_dl_mmap_zero)) {
+ _dl_dprintf(_dl_debug_file, "%s: mmap of a spare page failed!\n", _dl_progname);
+ _dl_exit(20);
+ }
+ }
+ retval = _dl_malloc_addr;
+ _dl_malloc_addr += size;
+
+ /*
+ * Align memory to DL_MALLOC_ALIGN byte boundary. Some
+ * platforms require this, others simply get better
+ * performance.
+ */
+ _dl_malloc_addr = (unsigned char *) (((unsigned long) _dl_malloc_addr + DL_MALLOC_ALIGN - 1) & ~(DL_MALLOC_ALIGN - 1));
+ return retval;
+}
+static void *_dl_zalloc(size_t size)
+{
+ void *p = _dl_malloc(size);
+ if (p)
+ _dl_memset(p, 0, size);
+ return p;
+}
+void _dl_free(void *p)
+{
+ if (_dl_free_function)
+ (*_dl_free_function) (p);
+}
-#if defined (__SUPPORT_LD_DEBUG__)
-static void debug_fini (int status, void *arg)
+#if defined(USE_TLS) && USE_TLS
+void *_dl_memalign(size_t __boundary, size_t __size)
{
- (void)status;
- _dl_dprintf(_dl_debug_file,"\ncalling fini: %s\n\n", (const char*)arg);
+ void *result;
+ int i = 0;
+ size_t delta;
+ size_t rounded = 0;
+
+ if (_dl_memalign_function)
+ return (*_dl_memalign_function) (__boundary, __size);
+
+ while (rounded < __boundary) {
+ rounded = (1 << i++);
+ }
+
+ delta = (((size_t) _dl_malloc_addr + __size) & (rounded - 1));
+
+ if ((result = _dl_malloc(rounded - delta)) == NULL)
+ return result;
+
+ result = _dl_malloc(__size);
+
+ return result;
}
#endif
-void _dl_get_ready_to_run(struct elf_resolve *tpnt, struct elf_resolve *app_tpnt,
- unsigned long load_addr, unsigned long *hash_addr,
- Elf32_auxv_t auxvt[AT_EGID + 1], char **envp, struct r_debug *debug_addr,
- unsigned char *malloc_buffer, unsigned char *mmap_zero, char **argv)
+static void __attribute__ ((destructor)) __attribute_used__ _dl_fini(void)
{
+ unsigned int i;
+ struct elf_resolve * tpnt;
+
+ for (i = 0; i < nlist; ++i) {
+ tpnt = init_fini_list[i];
+ if (tpnt->init_flag & FINI_FUNCS_CALLED)
+ continue;
+ tpnt->init_flag |= FINI_FUNCS_CALLED;
+ _dl_run_fini_array(tpnt);
+ if (tpnt->dynamic_info[DT_FINI]) {
+ void (*dl_elf_func) (void);
+
+ dl_elf_func = (void (*)(void)) (intptr_t) DL_RELOC_ADDR(tpnt->loadaddr, tpnt->dynamic_info[DT_FINI]);
+ _dl_if_debug_dprint("\ncalling FINI: %s\n\n", tpnt->libname);
+ DL_CALL_FUNC_AT_ADDR (dl_elf_func, tpnt->loadaddr, (void(*)(void)));
+ }
+ }
+}
+
+#ifdef __LDSO_PRELINK_SUPPORT__
+static void trace_objects(struct elf_resolve *tpnt, char *str_name)
+{
+ if (_dl_strcmp(_dl_trace_prelink, tpnt->libname) == 0)
+ _dl_trace_prelink_map = tpnt;
+ if (tpnt->libtype == elf_executable) {
+/* Main executeble */
+ _dl_dprintf(1, "\t%s => %s (%x, %x)", tpnt->libname, tpnt->libname,
+ tpnt->mapaddr, DL_LOADADDR_BASE(tpnt->loadaddr));
+ } else {
+/* Preloaded, Needed or interpreter */
+ _dl_dprintf(1, "\t%s => %s (%x, %x)", str_name, tpnt->libname,
+ tpnt->mapaddr, DL_LOADADDR_BASE(tpnt->loadaddr));
+ }
+
+#if defined USE_TLS && USE_TLS
+ if ((tpnt->libtype != program_interpreter) && (tpnt->l_tls_modid))
+ _dl_dprintf (1, " TLS(%x, %x)\n", tpnt->l_tls_modid,
+ (size_t) tpnt->l_tls_offset);
+ else
+#endif
+ _dl_dprintf (1, "\n");
+}
+#endif
+
+static struct elf_resolve * add_ldso(struct elf_resolve *tpnt,
+ DL_LOADADDR_TYPE load_addr,
+ ElfW(Addr) ldso_mapaddr,
+ ElfW(auxv_t) auxvt[AT_EGID + 1],
+ struct dyn_elf *rpnt)
+{
+ ElfW(Ehdr) *epnt = (ElfW(Ehdr) *) auxvt[AT_BASE].a_un.a_val;
+ ElfW(Phdr) *myppnt = (ElfW(Phdr) *)
+ DL_RELOC_ADDR(DL_GET_RUN_ADDR(load_addr, ldso_mapaddr),
+ epnt->e_phoff);
+ int j;
+ struct stat st;
+
+ tpnt = _dl_add_elf_hash_table(tpnt->libname, tpnt->loadaddr,
+ tpnt->dynamic_info, (unsigned long)tpnt->dynamic_addr,
+ 0);
+
+ tpnt->mapaddr = ldso_mapaddr;
+ if (_dl_stat(tpnt->libname, &st) >= 0) {
+ tpnt->st_dev = st.st_dev;
+ tpnt->st_ino = st.st_ino;
+ }
+ tpnt->n_phent = epnt->e_phnum;
+ tpnt->ppnt = myppnt;
+ for (j = 0; j < epnt->e_phnum; j++, myppnt++) {
+ if (myppnt->p_type == PT_GNU_RELRO) {
+ tpnt->relro_addr = myppnt->p_vaddr;
+ tpnt->relro_size = myppnt->p_memsz;
+ break;
+ }
+ }
+ tpnt->libtype = program_interpreter;
+ if (rpnt) {
+ rpnt->next = _dl_zalloc(sizeof(struct dyn_elf));
+ rpnt->next->prev = rpnt;
+ rpnt = rpnt->next;
+ } else {
+ rpnt = _dl_zalloc(sizeof(struct dyn_elf));
+ }
+ rpnt->dyn = tpnt;
+ tpnt->rtld_flags = RTLD_NOW | RTLD_GLOBAL; /* Must not be LAZY */
+
+ return tpnt;
+}
+
+static ptrdiff_t _dl_build_local_scope (struct elf_resolve **list,
+ struct elf_resolve *map)
+{
+ struct elf_resolve **p = list;
+ struct init_fini_list *q;
+
+ *p++ = map;
+ map->init_flag |= DL_RESERVED;
+ if (map->init_fini)
+ for (q = map->init_fini; q; q = q->next)
+ if (! (q->tpnt->init_flag & DL_RESERVED))
+ p += _dl_build_local_scope (p, q->tpnt);
+ return p - list;
+}
+
+void *_dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE load_addr,
+ ElfW(auxv_t) auxvt[AT_EGID + 1], char **envp, char **argv
+ DL_GET_READY_TO_RUN_EXTRA_PARMS)
+{
+ ElfW(Addr) app_mapaddr = 0, ldso_mapaddr = 0;
ElfW(Phdr) *ppnt;
+ ElfW(Dyn) *dpnt;
char *lpntstr;
- int i, goof = 0, be_lazy = RTLD_LAZY, trace_loaded_objects = 0;
+ unsigned int i, cnt, nscope_elem;
+ int unlazy = 0, trace_loaded_objects = 0;
struct dyn_elf *rpnt;
struct elf_resolve *tcurr;
struct elf_resolve *tpnt1;
- unsigned long brk_addr, *lpnt;
- int (*_dl_atexit) (void *);
-#if defined (__SUPPORT_LD_DEBUG__)
- int (*_dl_on_exit) (void (*FUNCTION)(int STATUS, void *ARG),void*);
+ struct elf_resolve *ldso_tpnt = NULL;
+ struct elf_resolve app_tpnt_tmp;
+ struct elf_resolve *app_tpnt = &app_tpnt_tmp;
+ struct r_debug *debug_addr;
+ unsigned long *lpnt;
+ unsigned long *_dl_envp; /* The environment address */
+ ElfW(Addr) relro_addr = 0;
+ size_t relro_size = 0;
+ struct r_scope_elem *global_scope;
+ struct elf_resolve **local_scope;
+
+#if defined(USE_TLS) && USE_TLS
+ void *tcbp = NULL;
#endif
+ /* Wahoo!!! We managed to make a function call! Get malloc
+ * setup so we can use _dl_dprintf() to print debug noise
+ * instead of the SEND_STDERR macros used in dl-startup.c */
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- /* Wahoo!!! */
- SEND_STDERR("Cool, we managed to make a function call.\n");
-#endif
+ _dl_memset(app_tpnt, 0, sizeof(*app_tpnt));
+ /* Store the page size for later use */
+ _dl_pagesize = (auxvt[AT_PAGESZ].a_un.a_val) ? (size_t) auxvt[AT_PAGESZ].a_un.a_val : PAGE_SIZE;
/* Make it so _dl_malloc can use the page of memory we have already
* allocated. We shouldn't need to grab any more memory. This must
- * be first since things like _dl_dprintf() use _dl_malloc().... */
- _dl_malloc_addr = malloc_buffer;
- _dl_mmap_zero = mmap_zero;
+ * be first since things like _dl_dprintf() use _dl_malloc()...
+ */
+ _dl_malloc_addr = (unsigned char *)_dl_pagesize;
+ _dl_mmap_zero = 0;
+
+ /* Wahoo!!! */
+ _dl_debug_early("Cool, ldso survived making function calls\n");
/* Now we have done the mandatory linking of some things. We are now
- * free to start using global variables, since these things have all been
- * fixed up by now. Still no function calls outside of this library ,
- * since the dynamic resolver is not yet ready. */
+ * free to start using global variables, since these things have all
+ * been fixed up by now. Still no function calls outside of this
+ * library, since the dynamic resolver is not yet ready.
+ */
if (argv[0]) {
_dl_progname = argv[0];
}
+#ifndef __LDSO_STANDALONE_SUPPORT__
+ if (_start == (void *) auxvt[AT_ENTRY].a_un.a_val) {
+ _dl_dprintf(_dl_debug_file, "Standalone execution is not enabled\n");
+ _dl_exit(1);
+ }
+#endif
+
/* Start to build the tables of the modules that are required for
* this beast to run. We start with the basic executable, and then
* go from there. Eventually we will run across ourself, and we
- * will need to properly deal with that as well. */
- lpnt = (unsigned long *) (tpnt->dynamic_info[DT_PLTGOT] + load_addr);
-
- tpnt->chains = hash_addr;
- tpnt->next = 0;
- tpnt->libname = 0;
- tpnt->libtype = program_interpreter;
- tpnt->loadaddr = (ElfW(Addr)) load_addr;
+ * will need to properly deal with that as well.
+ */
+ rpnt = NULL;
+ if (_dl_getenv("LD_BIND_NOW", envp))
+ unlazy = RTLD_NOW;
-#ifdef ALLOW_ZERO_PLTGOT
- if (tpnt->dynamic_info[DT_PLTGOT])
+ /* Now we need to figure out what kind of options are selected.
+ * Note that for SUID programs we ignore the settings in
+ * LD_LIBRARY_PATH.
+ */
+ if ((auxvt[AT_UID].a_un.a_val == (size_t)-1 && _dl_suid_ok()) ||
+ (auxvt[AT_UID].a_un.a_val != (size_t)-1 &&
+ auxvt[AT_UID].a_un.a_val == auxvt[AT_EUID].a_un.a_val &&
+ auxvt[AT_GID].a_un.a_val == auxvt[AT_EGID].a_un.a_val)) {
+ _dl_secure = 0;
+#ifdef __LDSO_PRELOAD_ENV_SUPPORT__
+ _dl_preload = _dl_getenv("LD_PRELOAD", envp);
#endif
- {
- INIT_GOT(lpnt, tpnt);
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "GOT found at %x\n", lpnt);
+#ifdef __LDSO_LD_LIBRARY_PATH__
+ _dl_library_path = _dl_getenv("LD_LIBRARY_PATH", envp);
+#endif
+ } else {
+ static const char unsecure_envvars[] =
+#ifdef EXTRA_UNSECURE_ENVVARS
+ EXTRA_UNSECURE_ENVVARS
#endif
+ UNSECURE_ENVVARS;
+ const char *nextp;
+ _dl_secure = 1;
+
+ nextp = unsecure_envvars;
+ do {
+ _dl_unsetenv (nextp, envp);
+ /* We could use rawmemchr but this need not be fast. */
+ nextp = _dl_strchr(nextp, '\0') + 1;
+ } while (*nextp != '\0');
+#ifdef __LDSO_PRELOAD_ENV_SUPPORT__
+ _dl_preload = NULL;
+#endif
+#ifdef __LDSO_LD_LIBRARY_PATH__
+ _dl_library_path = NULL;
+#endif
+ /* SUID binaries can be exploited if they do LAZY relocation. */
+ unlazy = RTLD_NOW;
}
- /* OK, this was a big step, now we need to scan all of the user images
- and load them properly. */
- {
- ElfW(Ehdr) *epnt;
- ElfW(Phdr) *myppnt;
- int j;
+#if defined(USE_TLS) && USE_TLS
+ _dl_error_catch_tsd = &_dl_initial_error_catch_tsd;
+ _dl_init_static_tls = &_dl_nothread_init_static_tls;
+#endif
- epnt = (ElfW(Ehdr) *) auxvt[AT_BASE].a_un.a_ptr;
- tpnt->n_phent = epnt->e_phnum;
- tpnt->ppnt = myppnt = (ElfW(Phdr) *) (load_addr + epnt->e_phoff);
- for (j = 0; j < epnt->e_phnum; j++, myppnt++) {
- if (myppnt->p_type == PT_DYNAMIC) {
- tpnt->dynamic_addr = (ElfW(Dyn) *)myppnt->p_vaddr + load_addr;
- tpnt->dynamic_size = myppnt->p_filesz;
+#ifdef __LDSO_STANDALONE_SUPPORT__
+ if (_start == (void *) auxvt[AT_ENTRY].a_un.a_val) {
+ unsigned int *aux_dat = (unsigned int *) argv;
+ int argc = aux_dat[-1];
+
+ tpnt->libname = argv[0];
+ while (argc > 1)
+ if (! _dl_strcmp (argv[1], "--library-path") && argc > 2) {
+#ifdef __LDSO_LD_LIBRARY_PATH__
+ _dl_library_path = argv[2];
+#endif
+ _dl_skip_args += 2;
+ argc -= 2;
+ argv += 2;
+ } else
+ break;
+
+ /*
+ * If we have no further argument the program was called incorrectly.
+ * Grant the user some education.
+ */
+
+ if (argc < 2) {
+ _dl_dprintf(1, "\
+Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\
+You have invoked `ld.so', the helper program for shared library executables.\n\
+This program usually lives in the file `/lib/ld.so', and special directives\n\
+in executable files using ELF shared libraries tell the system's program\n\
+loader to load the helper program from this file. This helper program loads\n\
+the shared libraries needed by the program executable, prepares the program\n\
+to run, and runs it. You may invoke this helper program directly from the\n\
+command line to load and run an ELF executable file; this is like executing\n\
+that file itself, but always uses this helper program from the file you\n\
+specified, instead of the helper program file specified in the executable\n\
+file you run. This is mostly of use for maintainers to test new versions\n\
+of this helper program; chances are you did not intend to run this program.\n\
+\n\
+ --library-path PATH use given PATH instead of content of the environment\n\
+ variable LD_LIBRARY_PATH\n");
+ _dl_exit(1);
+ }
+
+ ++_dl_skip_args;
+ ++argv;
+ _dl_progname = argv[0];
+
+ _dl_symbol_tables = rpnt = _dl_zalloc(sizeof(struct dyn_elf));
+ /*
+ * It needs to load the _dl_progname and to map it
+ * Usually it is the main application launched by means of the ld.so
+ * but it could be also a shared object (when ld.so used for tracing)
+ * We keep the misleading app_tpnt name to avoid variable pollution
+ */
+ app_tpnt = _dl_load_elf_shared_library(_dl_secure, &rpnt, _dl_progname);
+ if (!app_tpnt) {
+ _dl_dprintf(_dl_debug_file, "can't load '%s'\n", _dl_progname);
+ _dl_exit(16);
+ }
+ /*
+ * FIXME: it needs to properly handle a PIE executable
+ * Usually for a main application, loadaddr is computed as difference
+ * between auxvt entry points and phdr, so if it is not 0, that it is a
+ * PIE executable. In this case instead we need to set the loadaddr to 0
+ * because we are actually mapping the ELF for the main application by
+ * ourselves. So the PIE case must be checked.
+ */
+
+ app_tpnt->rtld_flags = unlazy | RTLD_GLOBAL;
+
+ /*
+ * This is used by gdb to locate the chain of shared libraries that are
+ * currently loaded.
+ */
+ debug_addr = _dl_zalloc(sizeof(struct r_debug));
+ ppnt = (ElfW(Phdr) *)app_tpnt->ppnt;
+ for (i = 0; i < app_tpnt->n_phent; i++, ppnt++) {
+ if (ppnt->p_type == PT_DYNAMIC) {
+ dpnt = (ElfW(Dyn) *) DL_RELOC_ADDR(app_tpnt->loadaddr, ppnt->p_vaddr);
+ _dl_parse_dynamic_info(dpnt, app_tpnt->dynamic_info, debug_addr, app_tpnt->loadaddr);
}
}
- }
- brk_addr = 0;
- rpnt = NULL;
+ _dl_ldsopath_init(tpnt);
+ } else {
+#endif
/* At this point we are now free to examine the user application,
- and figure out which libraries are supposed to be called. Until
- we have this list, we will not be completely ready for dynamic linking */
+ * and figure out which libraries are supposed to be called. Until
+ * we have this list, we will not be completely ready for dynamic
+ * linking.
+ */
- ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_ptr;
+ /* Find the runtime load address of the main executable. This may be
+ * different from what the ELF header says for ET_DYN/PIE executables.
+ */
+ {
+ unsigned int idx;
+ ElfW(Phdr) *phdr = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_val;
+
+ for (idx = 0; idx < auxvt[AT_PHNUM].a_un.a_val; idx++, phdr++)
+ if (phdr->p_type == PT_PHDR) {
+ DL_INIT_LOADADDR_PROG(app_tpnt->loadaddr, auxvt[AT_PHDR].a_un.a_val - phdr->p_vaddr);
+ break;
+ }
+
+ if (DL_LOADADDR_BASE(app_tpnt->loadaddr))
+ _dl_debug_early("Position Independent Executable: "
+ "app_tpnt->loadaddr=%x\n", DL_LOADADDR_BASE(app_tpnt->loadaddr));
+ }
+
+ /*
+ * This is used by gdb to locate the chain of shared libraries that are
+ * currently loaded.
+ */
+ debug_addr = _dl_zalloc(sizeof(struct r_debug));
+
+ ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_val;
for (i = 0; i < auxvt[AT_PHNUM].a_un.a_val; i++, ppnt++) {
- if (ppnt->p_type == PT_LOAD) {
-#ifndef __UCLIBC_PIE_SUPPORT__
- if (ppnt->p_vaddr + ppnt->p_memsz > brk_addr)
- brk_addr = ppnt->p_vaddr + ppnt->p_memsz;
-#else
- if (ppnt->p_vaddr + app_tpnt->loadaddr + ppnt->p_memsz > brk_addr)
- brk_addr = ppnt->p_vaddr + app_tpnt->loadaddr + ppnt->p_memsz;
-#endif
+ if (ppnt->p_type == PT_GNU_RELRO) {
+ relro_addr = ppnt->p_vaddr;
+ relro_size = ppnt->p_memsz;
+ }
+ if (!app_mapaddr && (ppnt->p_type == PT_LOAD)) {
+ app_mapaddr = DL_RELOC_ADDR (app_tpnt->loadaddr, ppnt->p_vaddr);
}
if (ppnt->p_type == PT_DYNAMIC) {
+ dpnt = (ElfW(Dyn) *) DL_RELOC_ADDR(app_tpnt->loadaddr, ppnt->p_vaddr);
+ _dl_parse_dynamic_info(dpnt, app_tpnt->dynamic_info, debug_addr, app_tpnt->loadaddr);
+#ifndef __FORCE_SHAREABLE_TEXT_SEGMENTS__
+ /* Ugly, ugly. We need to call mprotect to change the
+ * protection of the text pages so that we can do the
+ * dynamic linking. We can set the protection back
+ * again once we are done.
+ */
+ _dl_debug_early("calling mprotect on the application program\n");
+ /* Now cover the application program. */
+ if (app_tpnt->dynamic_info[DT_TEXTREL]) {
+ ElfW(Phdr) *ppnt_outer = ppnt;
+ ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_val;
+ for (i = 0; i < auxvt[AT_PHNUM].a_un.a_val; i++, ppnt++) {
+ if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W))
+ _dl_mprotect((void *) (DL_RELOC_ADDR(app_tpnt->loadaddr, ppnt->p_vaddr) & PAGE_ALIGN),
+ (DL_RELOC_ADDR(app_tpnt->loadaddr, ppnt->p_vaddr) & ADDR_ALIGN) +
+ (unsigned long) ppnt->p_filesz,
+ PROT_READ | PROT_WRITE | PROT_EXEC);
+ }
+ ppnt = ppnt_outer;
+ }
+#else
+ if (app_tpnt->dynamic_info[DT_TEXTREL]) {
+ _dl_dprintf(_dl_debug_file, "Can't modify application's text section; use the GCC option -fPIE for position-independent executables.\n");
+ _dl_exit(1);
+ }
+#endif
+
#ifndef ALLOW_ZERO_PLTGOT
/* make sure it's really there. */
if (app_tpnt->dynamic_info[DT_PLTGOT] == 0)
continue;
#endif
/* OK, we have what we need - slip this one into the list. */
-#ifndef __UCLIBC_PIE_SUPPORT__
- app_tpnt = _dl_add_elf_hash_table("", 0,
- app_tpnt->dynamic_info, ppnt->p_vaddr, ppnt->p_filesz);
-#else
- app_tpnt = _dl_add_elf_hash_table("", (char *)app_tpnt->loadaddr,
- app_tpnt->dynamic_info, ppnt->p_vaddr + app_tpnt->loadaddr, ppnt->p_filesz);
-#endif
+ app_tpnt = _dl_add_elf_hash_table(_dl_progname, app_tpnt->loadaddr,
+ app_tpnt->dynamic_info,
+ (unsigned long) DL_RELOC_ADDR(app_tpnt->loadaddr, ppnt->p_vaddr),
+ ppnt->p_filesz);
_dl_loaded_modules->libtype = elf_executable;
- _dl_loaded_modules->ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_ptr;
+ _dl_loaded_modules->ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_val;
_dl_loaded_modules->n_phent = auxvt[AT_PHNUM].a_un.a_val;
- _dl_symbol_tables = rpnt = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
- _dl_memset(rpnt, 0, sizeof(struct dyn_elf));
+ _dl_symbol_tables = rpnt = _dl_zalloc(sizeof(struct dyn_elf));
rpnt->dyn = _dl_loaded_modules;
+ app_tpnt->mapaddr = app_mapaddr;
+ app_tpnt->rtld_flags = unlazy | RTLD_GLOBAL;
app_tpnt->usage_count++;
- app_tpnt->symbol_scope = _dl_symbol_tables;
-#ifndef __UCLIBC_PIE_SUPPORT__
lpnt = (unsigned long *) (app_tpnt->dynamic_info[DT_PLTGOT]);
-#else
- lpnt = (unsigned long *) (app_tpnt->dynamic_info[DT_PLTGOT] + app_tpnt->loadaddr);
-#endif
#ifdef ALLOW_ZERO_PLTGOT
if (lpnt)
#endif
/* OK, fill this in - we did not have this before */
if (ppnt->p_type == PT_INTERP) {
- int readsize = 0;
- char *pnt, *pnt1, buf[1024];
- tpnt->libname = _dl_strdup((char *) ppnt->p_offset +
- (auxvt[AT_PHDR].a_un.a_val & PAGE_ALIGN));
-
- /* Determine if the shared lib loader is a symlink */
- _dl_memset(buf, 0, sizeof(buf));
- readsize = _dl_readlink(tpnt->libname, buf, sizeof(buf));
- if (readsize > 0 && readsize < (int)(sizeof(buf)-1)) {
- pnt1 = _dl_strrchr(buf, '/');
- if (pnt1 && buf != pnt1) {
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "changing tpnt->libname from '%s' to '%s'\n", tpnt->libname, buf);
-#endif
- tpnt->libname = _dl_strdup(buf);
- }
- }
+ tpnt->libname = (char *) DL_RELOC_ADDR(app_tpnt->loadaddr, ppnt->p_vaddr);
+
+ _dl_ldsopath_init(tpnt);
+ }
+
+ /* Discover any TLS sections if the target supports them. */
+ if (ppnt->p_type == PT_TLS) {
+#if defined(USE_TLS) && USE_TLS
+ if (ppnt->p_memsz > 0) {
+ app_tpnt->l_tls_blocksize = ppnt->p_memsz;
+ app_tpnt->l_tls_align = ppnt->p_align;
+ if (ppnt->p_align == 0)
+ app_tpnt->l_tls_firstbyte_offset = 0;
+ else
+ app_tpnt->l_tls_firstbyte_offset =
+ (ppnt->p_vaddr & (ppnt->p_align - 1));
+ app_tpnt->l_tls_initimage_size = ppnt->p_filesz;
+ app_tpnt->l_tls_initimage = (void *) ppnt->p_vaddr;
+
+ /* This image gets the ID one. */
+ _dl_tls_max_dtv_idx = app_tpnt->l_tls_modid = 1;
- /* Store the path where the shared lib loader was found for
- * later use */
- pnt = _dl_strdup(tpnt->libname);
- pnt1 = _dl_strrchr(pnt, '/');
- if (pnt != pnt1) {
- *pnt1 = '\0';
- _dl_ldsopath = pnt;
- } else {
- _dl_ldsopath = tpnt->libname;
}
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "Lib Loader:\t(%x) %s\n", tpnt->loadaddr, tpnt->libname);
+ _dl_debug_early("Found TLS header for application program\n");
+ break;
+#else
+ _dl_dprintf(_dl_debug_file, "Program uses unsupported TLS data!\n");
+ _dl_exit(1);
#endif
}
}
+ app_tpnt->relro_addr = relro_addr;
+ app_tpnt->relro_size = relro_size;
-
- /* Now we need to figure out what kind of options are selected.
- Note that for SUID programs we ignore the settings in LD_LIBRARY_PATH */
- {
- if (_dl_getenv("LD_BIND_NOW", envp))
- be_lazy = 0;
-
- if ((auxvt[AT_UID].a_un.a_val == -1 && _dl_suid_ok()) ||
- (auxvt[AT_UID].a_un.a_val != -1 &&
- auxvt[AT_UID].a_un.a_val == auxvt[AT_EUID].a_un.a_val
- && auxvt[AT_GID].a_un.a_val== auxvt[AT_EGID].a_un.a_val)) {
- _dl_secure = 0;
- _dl_preload = _dl_getenv("LD_PRELOAD", envp);
- _dl_library_path = _dl_getenv("LD_LIBRARY_PATH", envp);
- } else {
- _dl_secure = 1;
- _dl_preload = _dl_getenv("LD_PRELOAD", envp);
- _dl_unsetenv("LD_AOUT_PRELOAD", envp);
- _dl_unsetenv("LD_LIBRARY_PATH", envp);
- _dl_unsetenv("LD_AOUT_LIBRARY_PATH", envp);
- _dl_library_path = NULL;
- }
+#if defined(USE_TLS) && USE_TLS
+ /*
+ * Adjust the address of the TLS initialization image in
+ * case the executable is actually an ET_DYN object.
+ */
+ if (app_tpnt->l_tls_initimage != NULL) {
+ unsigned int tmp = (unsigned int) app_tpnt->l_tls_initimage;
+ app_tpnt->l_tls_initimage =
+ (char *) app_tpnt->l_tls_initimage + app_tpnt->loadaddr;
+ _dl_debug_early("Relocated TLS initial image from %x to %x (size = %x)\n",
+ tmp, app_tpnt->l_tls_initimage, app_tpnt->l_tls_initimage_size);
}
+#endif
+
+#ifdef __LDSO_STANDALONE_SUPPORT__
+ } /* ! ldso standalone mode */
+#endif
#ifdef __SUPPORT_LD_DEBUG__
- _dl_debug = _dl_getenv("LD_DEBUG", envp);
- if (_dl_debug)
- {
+ _dl_debug = _dl_getenv("LD_DEBUG", envp);
+ if (_dl_debug) {
if (_dl_strstr(_dl_debug, "all")) {
_dl_debug_detail = _dl_debug_move = _dl_debug_symbols
- = _dl_debug_reloc = _dl_debug_bindings = _dl_debug_nofixups = _dl_strstr(_dl_debug, "all");
- }
- else {
+ = _dl_debug_reloc = _dl_debug_bindings = _dl_debug_nofixups = (void*)1;
+ } else {
_dl_debug_detail = _dl_strstr(_dl_debug, "detail");
_dl_debug_move = _dl_strstr(_dl_debug, "move");
_dl_debug_symbols = _dl_strstr(_dl_debug, "sym");
_dl_debug_bindings = _dl_strstr(_dl_debug, "bind");
}
}
+
{
const char *dl_debug_output;
dl_debug_output = _dl_getenv("LD_DEBUG_OUTPUT", envp);
- if (dl_debug_output)
- {
+ if (dl_debug_output) {
char tmp[22], *tmp1, *filename;
int len1, len2;
_dl_memset(tmp, 0, sizeof(tmp));
- tmp1=_dl_simple_ltoa( tmp, (unsigned long)_dl_getpid());
+ tmp1 = _dl_simple_ltoa( tmp, (unsigned long)_dl_getpid());
len1 = _dl_strlen(dl_debug_output);
len2 = _dl_strlen(tmp1);
- filename = _dl_malloc(len1+len2+2);
+ filename = _dl_malloc(len1 + len2 + 2);
- if (filename)
- {
+ if (filename) {
_dl_strcpy (filename, dl_debug_output);
filename[len1] = '.';
_dl_strcpy (&filename[len1+1], tmp1);
- _dl_debug_file= _dl_open (filename, O_WRONLY|O_CREAT, 0644);
- if (_dl_debug_file<0)
- {
+ _dl_debug_file = _dl_open(filename, O_WRONLY|O_CREAT, 0644);
+ if (_dl_debug_file < 0) {
_dl_debug_file = 2;
- _dl_dprintf (2, "can't open file: '%s'\n",filename);
+ _dl_dprintf(_dl_debug_file, "can't open file: '%s'\n",filename);
}
}
}
}
+#endif
+#ifdef __LDSO_PRELINK_SUPPORT__
+{
+ char *ld_warn = _dl_getenv ("LD_WARN", envp);
+ if (ld_warn && *ld_warn == '\0')
+ _dl_verbose = false;
+}
+ _dl_trace_prelink = _dl_getenv("LD_TRACE_PRELINKING", envp);
#endif
+
if (_dl_getenv("LD_TRACE_LOADED_OBJECTS", envp) != NULL) {
trace_loaded_objects++;
}
+
#ifndef __LDSO_LDD_SUPPORT__
if (trace_loaded_objects) {
_dl_dprintf(_dl_debug_file, "Use the ldd provided by uClibc\n");
}
#endif
+ ldso_mapaddr = (ElfW(Addr)) auxvt[AT_BASE].a_un.a_val;
/*
* OK, fix one more thing - set up debug_addr so it will point
* to our chain. Later we may need to fill in more fields, but this
*/
debug_addr->r_map = (struct link_map *) _dl_loaded_modules;
debug_addr->r_version = 1;
- debug_addr->r_ldbase = load_addr;
+ debug_addr->r_ldbase = (ElfW(Addr))
+ DL_LOADADDR_BASE(DL_GET_RUN_ADDR(load_addr, ldso_mapaddr));
debug_addr->r_brk = (unsigned long) &_dl_debug_state;
_dl_debug_addr = debug_addr;
- /* Notify the debugger we are in a consistant state */
- _dl_debug_addr->r_state = RT_CONSISTENT;
- _dl_debug_state();
+ /* Do not notify the debugger until the interpreter is in the list */
/* OK, we now have the application in the list, and we have some
- basic stuff in place. Now search through the list for other shared
- libraries that should be loaded, and insert them on the list in the
- correct order. */
+ * basic stuff in place. Now search through the list for other shared
+ * libraries that should be loaded, and insert them on the list in the
+ * correct order.
+ */
_dl_map_cache();
-
- if (_dl_preload)
- {
+#ifdef __LDSO_PRELOAD_ENV_SUPPORT__
+ if (_dl_preload) {
char c, *str, *str2;
str = _dl_preload;
while (*str == ':' || *str == ' ' || *str == '\t')
str++;
- while (*str)
- {
+
+ while (*str) {
str2 = str;
while (*str2 && *str2 != ':' && *str2 != ' ' && *str2 != '\t')
str2++;
c = *str2;
*str2 = '\0';
- if (!_dl_secure || _dl_strchr(str, '/') == NULL)
- {
- if ((tpnt1 = _dl_check_if_named_library_is_loaded(str, trace_loaded_objects)))
- {
- continue;
- }
-#if defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tfile='%s'; needed by '%s'\n",
- str, _dl_progname);
-#endif
- tpnt1 = _dl_load_shared_library(_dl_secure, &rpnt, NULL, str, trace_loaded_objects);
+
+ if (!_dl_secure || _dl_strchr(str, '/') == NULL) {
+ _dl_if_debug_dprint("\tfile='%s'; needed by '%s'\n", str, _dl_progname);
+
+ tpnt1 = _dl_load_shared_library(
+ _dl_secure ? DL_RESOLVE_SECURE : 0,
+ &rpnt, NULL, str, trace_loaded_objects);
if (!tpnt1) {
#ifdef __LDSO_LDD_SUPPORT__
- if (trace_loaded_objects)
+ if (trace_loaded_objects || _dl_trace_prelink)
_dl_dprintf(1, "\t%s => not found\n", str);
else
#endif
{
- _dl_dprintf(2, "%s: can't load " "library '%s'\n", _dl_progname, str);
+ _dl_dprintf(_dl_debug_file, "%s: can't load " "library '%s'\n", _dl_progname, str);
_dl_exit(15);
}
} else {
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "Loading:\t(%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
-#endif
+ tpnt1->rtld_flags = unlazy | RTLD_GLOBAL;
+
+ _dl_debug_early("Loading: (%x) %s\n", DL_LOADADDR_BASE(tpnt1->loadaddr), tpnt1->libname);
+
#ifdef __LDSO_LDD_SUPPORT__
- if (trace_loaded_objects && tpnt1->usage_count==1) {
- /* this is a real hack to make ldd not print
- * the library itself when run on a library. */
+ if (trace_loaded_objects && !_dl_trace_prelink &&
+ tpnt1->usage_count == 1) {
+ /* This is a real hack to make
+ * ldd not print the library
+ * itself when run on a
+ * library.
+ */
if (_dl_strcmp(_dl_progname, str) != 0)
_dl_dprintf(1, "\t%s => %s (%x)\n", str, tpnt1->libname,
- (unsigned) tpnt1->loadaddr);
+ DL_LOADADDR_BASE(tpnt1->loadaddr));
}
#endif
}
}
+
*str2 = c;
str = str2;
while (*str == ':' || *str == ' ' || *str == '\t')
str++;
}
}
+#endif /* __LDSO_PRELOAD_ENV_SUPPORT__ */
-#ifdef SUPPORT_LDSO_PRELOAD_FILE
- {
+#ifdef __LDSO_PRELOAD_FILE_SUPPORT__
+ do {
+ char *preload;
int fd;
+ char c, *cp, *cp2;
struct stat st;
- char *preload;
- if (!_dl_stat(LDSO_PRELOAD, &st) && st.st_size > 0) {
- if ((fd = _dl_open(LDSO_PRELOAD, O_RDONLY)) < 0) {
- _dl_dprintf(2, "%s: can't open file '%s'\n",
- _dl_progname, LDSO_PRELOAD);
- } else {
- preload = (caddr_t) _dl_mmap(0, st.st_size + 1,
- PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
- _dl_close(fd);
- if (preload == (caddr_t) - 1) {
- _dl_dprintf(2, "%s: can't map file '%s'\n",
- _dl_progname, LDSO_PRELOAD);
- } else {
- char c, *cp, *cp2;
-
- /* convert all separators and comments to spaces */
- for (cp = preload; *cp; /*nada */ ) {
- if (*cp == ':' || *cp == '\t' || *cp == '\n') {
- *cp++ = ' ';
- } else if (*cp == '#') {
- do
- *cp++ = ' ';
- while (*cp != '\n' && *cp != '\0');
- } else {
- cp++;
- }
- }
- /* find start of first library */
- for (cp = preload; *cp && *cp == ' '; cp++)
- /*nada */ ;
+ if (_dl_stat(LDSO_PRELOAD, &st) || st.st_size == 0) {
+ break;
+ }
- while (*cp) {
- /* find end of library */
- for (cp2 = cp; *cp && *cp != ' '; cp++)
- /*nada */ ;
- c = *cp;
- *cp = '\0';
+ if ((fd = _dl_open(LDSO_PRELOAD, O_RDONLY, 0)) < 0) {
+ _dl_dprintf(_dl_debug_file, "%s: can't open file '%s'\n",
+ _dl_progname, LDSO_PRELOAD);
+ break;
+ }
- if ((tpnt1 = _dl_check_if_named_library_is_loaded(cp2, trace_loaded_objects)))
- {
- continue;
- }
-#if defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tfile='%s'; needed by '%s'\n",
- cp2, _dl_progname);
-#endif
- tpnt1 = _dl_load_shared_library(0, &rpnt, NULL, cp2, trace_loaded_objects);
- if (!tpnt1) {
-#ifdef __LDSO_LDD_SUPPORT__
- if (trace_loaded_objects)
- _dl_dprintf(1, "\t%s => not found\n", cp2);
- else
-#endif
- {
- _dl_dprintf(2, "%s: can't load library '%s'\n", _dl_progname, cp2);
- _dl_exit(15);
- }
- } else {
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "Loading:\t(%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
-#endif
-#ifdef __LDSO_LDD_SUPPORT__
- if (trace_loaded_objects && tpnt1->usage_count==1) {
- _dl_dprintf(1, "\t%s => %s (%x)\n", cp2,
- tpnt1->libname, (unsigned) tpnt1->loadaddr);
- }
-#endif
- }
+ preload = (caddr_t) _dl_mmap(0, st.st_size + 1,
+ PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+ _dl_close(fd);
+ if (preload == (caddr_t) -1) {
+ _dl_dprintf(_dl_debug_file, "%s:%i: can't map '%s'\n",
+ _dl_progname, __LINE__, LDSO_PRELOAD);
+ break;
+ }
- /* find start of next library */
- *cp = c;
- for ( /*nada */ ; *cp && *cp == ' '; cp++)
- /*nada */ ;
- }
+ /* convert all separators and comments to spaces */
+ for (cp = preload; *cp; /*nada */ ) {
+ if (*cp == ':' || *cp == '\t' || *cp == '\n') {
+ *cp++ = ' ';
+ } else if (*cp == '#') {
+ do {
+ *cp++ = ' ';
+ } while (*cp != '\n' && *cp != '\0');
+ } else {
+ cp++;
+ }
+ }
+
+ /* find start of first library */
+ for (cp = preload; *cp && *cp == ' '; cp++)
+ /*nada */ ;
+
+ while (*cp) {
+ /* find end of library */
+ for (cp2 = cp; *cp && *cp != ' '; cp++)
+ /*nada */ ;
+ c = *cp;
+ *cp = '\0';
+
+ _dl_if_debug_dprint("\tfile='%s'; needed by '%s'\n", cp2, _dl_progname);
+
+ tpnt1 = _dl_load_shared_library(0, &rpnt, NULL, cp2, trace_loaded_objects);
+ if (!tpnt1) {
+# ifdef __LDSO_LDD_SUPPORT__
+ if (trace_loaded_objects || _dl_trace_prelink)
+ _dl_dprintf(1, "\t%s => not found\n", cp2);
+ else
+# endif
+ {
+ _dl_dprintf(_dl_debug_file, "%s: can't load library '%s'\n", _dl_progname, cp2);
+ _dl_exit(15);
+ }
+ } else {
+ tpnt1->rtld_flags = unlazy | RTLD_GLOBAL;
- _dl_munmap(preload, st.st_size + 1);
+ _dl_debug_early("Loading: (%x) %s\n", DL_LOADADDR_BASE(tpnt1->loadaddr), tpnt1->libname);
+
+# ifdef __LDSO_LDD_SUPPORT__
+ if (trace_loaded_objects && !_dl_trace_prelink &&
+ tpnt1->usage_count == 1) {
+ _dl_dprintf(1, "\t%s => %s (%x)\n",
+ cp2, tpnt1->libname,
+ DL_LOADADDR_BASE(tpnt1->loadaddr));
}
+# endif
}
+
+ /* find start of next library */
+ *cp = c;
+ for ( /*nada */ ; *cp && *cp == ' '; cp++)
+ /*nada */ ;
}
- }
-#endif
- for (tcurr = _dl_loaded_modules; tcurr; tcurr = tcurr->next)
- {
- Elf32_Dyn *dpnt;
- for (dpnt = (Elf32_Dyn *) tcurr->dynamic_addr; dpnt->d_tag; dpnt++)
- {
- if (dpnt->d_tag == DT_NEEDED)
- {
+ _dl_munmap(preload, st.st_size + 1);
+ } while (0);
+#endif /* __LDSO_PRELOAD_FILE_SUPPORT__ */
+
+ nlist = 0;
+ for (tcurr = _dl_loaded_modules; tcurr; tcurr = tcurr->next) {
+ ElfW(Dyn) *this_dpnt;
+
+ nlist++;
+ for (this_dpnt = (ElfW(Dyn) *) tcurr->dynamic_addr; this_dpnt->d_tag; this_dpnt++) {
+ if (this_dpnt->d_tag == DT_NEEDED) {
char *name;
- lpntstr = (char*) (tcurr->loadaddr + tcurr->dynamic_info[DT_STRTAB] + dpnt->d_un.d_val);
+ struct init_fini_list *tmp;
+
+ lpntstr = (char*) (tcurr->dynamic_info[DT_STRTAB] + this_dpnt->d_un.d_val);
name = _dl_get_last_path_component(lpntstr);
+ _dl_if_debug_dprint("\tfile='%s'; needed by '%s'\n", lpntstr, _dl_progname);
- if ((tpnt1 = _dl_check_if_named_library_is_loaded(name, trace_loaded_objects)))
- {
- continue;
- }
-#if defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tfile='%s'; needed by '%s'\n",
- lpntstr, _dl_progname);
-#endif
- if (!(tpnt1 = _dl_load_shared_library(0, &rpnt, tcurr, lpntstr, trace_loaded_objects)))
- {
+ if (_dl_strcmp(name, UCLIBC_LDSO) == 0) {
+ if (!ldso_tpnt) {
+ /* Insert the ld.so only once */
+ ldso_tpnt = add_ldso(tpnt, load_addr,
+ ldso_mapaddr, auxvt, rpnt);
+ }
+ ldso_tpnt->usage_count++;
+ tpnt1 = ldso_tpnt;
+ } else
+ tpnt1 = _dl_load_shared_library(0, &rpnt, tcurr, lpntstr, trace_loaded_objects);
+
+ if (!tpnt1) {
#ifdef __LDSO_LDD_SUPPORT__
- if (trace_loaded_objects) {
+ if (trace_loaded_objects || _dl_trace_prelink) {
_dl_dprintf(1, "\t%s => not found\n", lpntstr);
continue;
} else
#endif
{
- _dl_dprintf(2, "%s: can't load library '%s'\n", _dl_progname, lpntstr);
+ _dl_dprintf(_dl_debug_file, "%s: can't load library '%s'\n", _dl_progname, lpntstr);
_dl_exit(16);
}
- } else {
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "Loading:\t(%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
-#endif
+ }
+
+ tmp = alloca(sizeof(struct init_fini_list)); /* Allocates on stack, no need to free this memory */
+ tmp->tpnt = tpnt1;
+ tmp->next = tcurr->init_fini;
+ tcurr->init_fini = tmp;
+
+ tpnt1->rtld_flags = unlazy | RTLD_GLOBAL;
+
+ _dl_debug_early("Loading: (%x) %s\n", DL_LOADADDR_BASE(tpnt1->loadaddr), tpnt1->libname);
+
#ifdef __LDSO_LDD_SUPPORT__
- if (trace_loaded_objects && tpnt1->usage_count==1) {
- _dl_dprintf(1, "\t%s => %s (%x)\n", lpntstr, tpnt1->libname,
- (unsigned) tpnt1->loadaddr);
- }
-#endif
+ if (trace_loaded_objects && !_dl_trace_prelink &&
+ tpnt1->usage_count == 1) {
+ _dl_dprintf(1, "\t%s => %s (%x)\n",
+ lpntstr, tpnt1->libname,
+ DL_LOADADDR_BASE(tpnt1->loadaddr));
}
+#endif
}
}
}
+ _dl_unmap_cache();
+ /* Keep track of the number of elements in the global scope */
+ nscope_elem = nlist;
- _dl_unmap_cache();
+ if (_dl_loaded_modules->libtype == elf_executable) {
+ --nlist; /* Exclude the application. */
+ tcurr = _dl_loaded_modules->next;
+ } else
+ tcurr = _dl_loaded_modules;
+ init_fini_list = _dl_malloc(nlist * sizeof(struct elf_resolve *));
+ i = 0;
+ for (; tcurr; tcurr = tcurr->next)
+ init_fini_list[i++] = tcurr;
+
+ /* Sort the INIT/FINI list in dependency order. */
+ for (tcurr = _dl_loaded_modules->next; tcurr; tcurr = tcurr->next) {
+ unsigned int j, k;
+
+ for (j = 0; init_fini_list[j] != tcurr; ++j)
+ /* Empty */;
+ for (k = j + 1; k < nlist; ++k) {
+ struct init_fini_list *runp = init_fini_list[k]->init_fini;
+
+ for (; runp; runp = runp->next) {
+ if (runp->tpnt == tcurr) {
+ struct elf_resolve *here = init_fini_list[k];
+ _dl_if_debug_dprint("Move %s from pos %d to %d in INIT/FINI list\n", here->libname, k, j);
+ for (i = (k - j); i; --i)
+ init_fini_list[i+j] = init_fini_list[i+j-1];
+ init_fini_list[j] = here;
+ ++j;
+ break;
+ }
+ }
+ }
+ }
+#ifdef __SUPPORT_LD_DEBUG__
+ if (_dl_debug) {
+ _dl_dprintf(_dl_debug_file, "\nINIT/FINI order and dependencies:\n");
+ for (i = 0; i < nlist; i++) {
+ struct init_fini_list *tmp;
+
+ _dl_dprintf(_dl_debug_file, "lib: %s has deps:\n",
+ init_fini_list[i]->libname);
+ tmp = init_fini_list[i]->init_fini;
+ for (; tmp; tmp = tmp->next)
+ _dl_dprintf(_dl_debug_file, " %s ", tmp->tpnt->libname);
+ _dl_dprintf(_dl_debug_file, "\n");
+ }
+ }
+#endif
/*
- * If the program interpreter is not in the module chain, add it. This will
- * be required for dlopen to be able to access the internal functions in the
- * dynamic linker.
+ * If the program interpreter is not in the module chain, add it.
+ * This will be required for dlopen to be able to access the internal
+ * functions in the dynamic linker and to relocate the interpreter
+ * again once all libs are loaded.
*/
- if (tpnt) {
- tcurr = _dl_loaded_modules;
- if (tcurr)
- while (tcurr->next)
- tcurr = tcurr->next;
- tpnt->next = NULL;
+ if (!ldso_tpnt) {
+ tpnt = add_ldso(tpnt, load_addr, ldso_mapaddr, auxvt, rpnt);
tpnt->usage_count++;
-
- if (tcurr) {
- tcurr->next = tpnt;
- tpnt->prev = tcurr;
- } else {
- _dl_loaded_modules = tpnt;
- tpnt->prev = NULL;
- }
- if (rpnt) {
- rpnt->next = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
- _dl_memset(rpnt->next, 0, sizeof(struct dyn_elf));
- rpnt->next->prev = rpnt;
- rpnt = rpnt->next;
- } else {
- rpnt = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
- _dl_memset(rpnt, 0, sizeof(struct dyn_elf));
- }
- rpnt->dyn = tpnt;
+ nscope_elem++;
+ } else
+ tpnt = ldso_tpnt;
+
+#ifdef RERELOCATE_LDSO
+ /* Only rerelocate functions for now. */
+ tpnt->init_flag = RELOCS_DONE;
+ lpnt = (unsigned long *) (tpnt->dynamic_info[DT_PLTGOT]);
+# ifdef ALLOW_ZERO_PLTGOT
+ if (tpnt->dynamic_info[DT_PLTGOT])
+# endif
+ INIT_GOT(lpnt, tpnt);
+#else
+ tpnt->init_flag = RELOCS_DONE | JMP_RELOCS_DONE;
+#endif
tpnt = NULL;
+
+ /*
+ * Allocate the global scope array.
+ */
+ scope_elem_list = (struct elf_resolve **) _dl_malloc(nscope_elem * sizeof(struct elf_resolve *));
+
+ for (i = 0, tcurr = _dl_loaded_modules; tcurr; tcurr = tcurr->next)
+ scope_elem_list[i++] = tcurr;
+
+ _dl_loaded_modules->symbol_scope.r_list = scope_elem_list;
+ _dl_loaded_modules->symbol_scope.r_nlist = nscope_elem;
+ /*
+ * The symbol scope of the application, that is the first entry of the
+ * _dl_loaded_modules list, is just the global scope to be used for the
+ * symbol lookup.
+ */
+ global_scope = &_dl_loaded_modules->symbol_scope;
+
+ /* Build the local scope for each loaded modules. */
+ local_scope = _dl_malloc(nscope_elem * sizeof(struct elf_resolve *));
+ i = 1;
+ for (tcurr = _dl_loaded_modules->next; tcurr; tcurr = tcurr->next) {
+ unsigned int k;
+ cnt = _dl_build_local_scope(local_scope, scope_elem_list[i++]);
+ tcurr->symbol_scope.r_list = _dl_malloc(cnt * sizeof(struct elf_resolve *));
+ tcurr->symbol_scope.r_nlist = cnt;
+ _dl_memcpy (tcurr->symbol_scope.r_list, local_scope, cnt * sizeof (struct elf_resolve *));
+ /* Restoring the init_flag.*/
+ for (k = 1; k < nscope_elem; k++)
+ scope_elem_list[k]->init_flag &= ~DL_RESERVED;
}
+ _dl_free(local_scope);
+
#ifdef __LDSO_LDD_SUPPORT__
- /* End of the line for ldd.... */
- if (trace_loaded_objects) {
- _dl_dprintf(1, "\t%s => %s (%x)\n", rpnt->dyn->libname + (_dl_strlen(_dl_ldsopath)) + 1,
- rpnt->dyn->libname, rpnt->dyn->loadaddr);
+ /* Exit if LD_TRACE_LOADED_OBJECTS is on. */
+ if (trace_loaded_objects && !_dl_trace_prelink)
_dl_exit(0);
+#endif
+
+#if defined(USE_TLS) && USE_TLS
+ /* We do not initialize any of the TLS functionality unless any of the
+ * initial modules uses TLS. This makes dynamic loading of modules with
+ * TLS impossible, but to support it requires either eagerly doing setup
+ * now or lazily doing it later. Doing it now makes us incompatible with
+ * an old kernel that can't perform TLS_INIT_TP, even if no TLS is ever
+ * used. Trying to do it lazily is too hairy to try when there could be
+ * multiple threads (from a non-TLS-using libpthread). */
+ bool was_tls_init_tp_called = tls_init_tp_called;
+ if (tcbp == NULL) {
+ _dl_debug_early("Calling init_tls()!\n");
+ tcbp = init_tls ();
}
#endif
+#ifdef __UCLIBC_HAS_SSP__
+ /* Set up the stack checker's canary. */
+ stack_chk_guard = _dl_setup_stack_chk_guard ();
+# ifdef THREAD_SET_STACK_GUARD
+ THREAD_SET_STACK_GUARD (stack_chk_guard);
+# else
+ __stack_chk_guard = stack_chk_guard;
+# endif
+# ifdef __UCLIBC_HAS_SSP_COMPAT__
+ __guard = stack_chk_guard;
+# endif
+#endif
+#ifdef __LDSO_PRELINK_SUPPORT__
+ if (_dl_trace_prelink) {
+
+ unsigned int nscope_trace = ldso_tpnt ? nscope_elem : (nscope_elem - 1);
+
+ for (i = 0; i < nscope_trace; i++)
+ trace_objects(scope_elem_list[i],
+ _dl_get_last_path_component(scope_elem_list[i]->libname));
+
+ if (_dl_verbose)
+ /* Warn about undefined symbols. */
+ if (_dl_symbol_tables)
+ if (_dl_fixup(_dl_symbol_tables, global_scope, unlazy))
+ _dl_exit(-1);
+ _dl_exit(0);
+ }
+
+ if (_dl_loaded_modules->dynamic_info[DT_GNU_LIBLIST_IDX]) {
+ ElfW(Lib) *liblist, *liblistend;
+ struct elf_resolve **r_list, **r_listend, *l;
+ const char *strtab = (const char *)_dl_loaded_modules->dynamic_info[DT_STRTAB];
+
+ _dl_assert (_dl_loaded_modules->dynamic_info[DT_GNU_LIBLISTSZ_IDX] != 0);
+ liblist = (ElfW(Lib) *) _dl_loaded_modules->dynamic_info[DT_GNU_LIBLIST_IDX];
+ liblistend = (ElfW(Lib) *)
+ ((char *) liblist + _dl_loaded_modules->dynamic_info[DT_GNU_LIBLISTSZ_IDX]);
+ r_list = _dl_loaded_modules->symbol_scope.r_list;
+ r_listend = r_list + nscope_elem;
+
+ for (; r_list < r_listend && liblist < liblistend; r_list++) {
+ l = *r_list;
+
+ if (l == _dl_loaded_modules)
+ continue;
+
+ /* If the library is not mapped where it should, fail. */
+ if (l->loadaddr)
+ break;
+
+ /* Next, check if checksum matches. */
+ if (l->dynamic_info[DT_CHECKSUM_IDX] == 0 ||
+ l->dynamic_info[DT_CHECKSUM_IDX] != liblist->l_checksum)
+ break;
+
+ if (l->dynamic_info[DT_GNU_PRELINKED_IDX] == 0 ||
+ (l->dynamic_info[DT_GNU_PRELINKED_IDX] != liblist->l_time_stamp))
+ break;
+
+ if (_dl_strcmp(strtab + liblist->l_name, _dl_get_last_path_component(l->libname)) != 0)
+ break;
+
+ ++liblist;
+ }
+
+
+ if (r_list == r_listend && liblist == liblistend)
+ prelinked = true;
+
+ }
+
+ _dl_debug_early ("\nprelink checking: %s\n", prelinked ? "ok" : "failed");
+
+ if (prelinked) {
+ if (_dl_loaded_modules->dynamic_info[DT_GNU_CONFLICT_IDX]) {
+ ELF_RELOC *conflict;
+ unsigned long conflict_size;
+
+ _dl_assert (_dl_loaded_modules->dynamic_info[DT_GNU_CONFLICTSZ_IDX] != 0);
+ conflict = (ELF_RELOC *) _dl_loaded_modules->dynamic_info[DT_GNU_CONFLICT_IDX];
+ conflict_size = _dl_loaded_modules->dynamic_info[DT_GNU_CONFLICTSZ_IDX];
+ _dl_parse_relocation_information(_dl_symbol_tables, global_scope,
+ (unsigned long) conflict, conflict_size);
+ }
+
+ /* Mark all the objects so we know they have been already relocated. */
+ for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
+ tpnt->init_flag |= RELOCS_DONE;
+ if (tpnt->relro_size)
+ _dl_protect_relro (tpnt);
+ }
+ } else
+#endif
+
+ {
+
+ _dl_debug_early("Beginning relocation fixups\n");
#ifdef __mips__
/*
* Relocation of the GOT entries for MIPS have to be done
* after all the libraries have been loaded.
*/
- _dl_perform_mips_global_got_relocations(_dl_loaded_modules);
+ _dl_perform_mips_global_got_relocations(_dl_loaded_modules, !unlazy);
#endif
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "Beginning relocation fixups\n");
-#endif
/*
- * OK, now all of the kids are tucked into bed in their proper addresses.
- * Now we go through and look for REL and RELA records that indicate fixups
- * to the GOT tables. We need to do this in reverse order so that COPY
- * directives work correctly */
+ * OK, now all of the kids are tucked into bed in their proper
+ * addresses. Now we go through and look for REL and RELA records that
+ * indicate fixups to the GOT tables. We need to do this in reverse
+ * order so that COPY directives work correctly.
+ */
if (_dl_symbol_tables)
- goof += _dl_fixup(_dl_symbol_tables, be_lazy);
-
-
- /* OK, at this point things are pretty much ready to run. Now we
- need to touch up a few items that are required, and then
- we can let the user application have at it. Note that
- the dynamic linker itself is not guaranteed to be fully
- dynamicly linked if we are using ld.so.1, so we have to look
- up each symbol individually. */
+ if (_dl_fixup(_dl_symbol_tables, global_scope, unlazy))
+ _dl_exit(-1);
-
- _dl_brkp = (unsigned long *) (intptr_t) _dl_find_hash("___brk_addr", NULL, NULL, symbolrel);
-
- if (_dl_brkp) {
- *_dl_brkp = brk_addr;
+ for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
+ if (tpnt->relro_size)
+ _dl_protect_relro (tpnt);
+ }
+ } /* not prelinked */
+
+#if defined(USE_TLS) && USE_TLS
+ if (!was_tls_init_tp_called && _dl_tls_max_dtv_idx > 0)
+ ++_dl_tls_generation;
+
+ _dl_debug_early("Calling _dl_allocate_tls_init()!\n");
+
+ /* Now that we have completed relocation, the initializer data
+ for the TLS blocks has its final values and we can copy them
+ into the main thread's TLS area, which we allocated above. */
+ _dl_allocate_tls_init (tcbp);
+
+ /* And finally install it for the main thread. If ld.so itself uses
+ TLS we know the thread pointer was initialized earlier. */
+ if (! tls_init_tp_called) {
+ const char *lossage = (char *) TLS_INIT_TP (tcbp, USE___THREAD);
+ if (__builtin_expect (lossage != NULL, 0)) {
+ _dl_debug_early("cannot set up thread-local storage: %s\n", lossage);
+ _dl_exit(30);
+ }
}
- _dl_envp = (unsigned long *) (intptr_t) _dl_find_hash("__environ", NULL, NULL, symbolrel);
+#endif /* USE_TLS */
+
+ /* OK, at this point things are pretty much ready to run. Now we need
+ * to touch up a few items that are required, and then we can let the
+ * user application have at it. Note that the dynamic linker itself
+ * is not guaranteed to be fully dynamicly linked if we are using
+ * ld.so.1, so we have to look up each symbol individually.
+ */
- if (_dl_envp) {
+ _dl_envp = (unsigned long *) (intptr_t) _dl_find_hash(__C_SYMBOL_PREFIX__ "__environ", global_scope, NULL, 0, NULL);
+ if (_dl_envp)
*_dl_envp = (unsigned long) envp;
- }
-#ifndef FORCE_SHAREABLE_TEXT_SEGMENTS
+#ifndef __FORCE_SHAREABLE_TEXT_SEGMENTS__
{
unsigned int j;
ElfW(Phdr) *myppnt;
- /* We had to set the protections of all pages to R/W for dynamic linking.
- Set text pages back to R/O */
+ /* We had to set the protections of all pages to R/W for
+ * dynamic linking. Set text pages back to R/O.
+ */
for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
for (myppnt = tpnt->ppnt, j = 0; j < tpnt->n_phent; j++, myppnt++) {
if (myppnt->p_type == PT_LOAD && !(myppnt->p_flags & PF_W) && tpnt->dynamic_info[DT_TEXTREL]) {
- _dl_mprotect((void *) (tpnt->loadaddr + (myppnt->p_vaddr & PAGE_ALIGN)),
+ _dl_mprotect((void *) (DL_RELOC_ADDR(tpnt->loadaddr, myppnt->p_vaddr) & PAGE_ALIGN),
(myppnt->p_vaddr & ADDR_ALIGN) + (unsigned long) myppnt->p_filesz, LXFLAGS(myppnt->p_flags));
}
}
}
#endif
- _dl_atexit = (int (*)(void *)) (intptr_t) _dl_find_hash("atexit", NULL, NULL, symbolrel);
-#if defined (__SUPPORT_LD_DEBUG__)
- _dl_on_exit = (int (*)(void (*)(int, void *),void*))
- (intptr_t) _dl_find_hash("on_exit", NULL, NULL, symbolrel);
-#endif
-
/* Notify the debugger we have added some objects. */
_dl_debug_addr->r_state = RT_ADD;
_dl_debug_state();
- for (rpnt = _dl_symbol_tables; rpnt!=NULL&& rpnt->next!=NULL; rpnt=rpnt->next)
- ;
-
- for (;rpnt!=NULL; rpnt=rpnt->prev)
- {
- tpnt = rpnt->dyn;
-
- if (tpnt->libtype == program_interpreter)
- continue;
-
- /* Apparently crt0/1 for the application is responsible for handling this.
- * We only need to run the init/fini for shared libraries
- */
- if (tpnt->libtype == elf_executable)
- break; /* at this point all shared libs are initialized !! */
+ /* Run pre-initialization functions for the executable. */
+ _dl_run_array_forward(_dl_loaded_modules->dynamic_info[DT_PREINIT_ARRAY],
+ _dl_loaded_modules->dynamic_info[DT_PREINIT_ARRAYSZ],
+ _dl_loaded_modules->loadaddr);
+ /* Run initialization functions for loaded objects. For the
+ main executable, they will be run from __uClibc_main. */
+ for (i = nlist; i; --i) {
+ tpnt = init_fini_list[i-1];
+ tpnt->init_fini = NULL; /* Clear, since alloca was used */
if (tpnt->init_flag & INIT_FUNCS_CALLED)
continue;
tpnt->init_flag |= INIT_FUNCS_CALLED;
if (tpnt->dynamic_info[DT_INIT]) {
void (*dl_elf_func) (void);
- dl_elf_func = (void (*)(void)) (intptr_t) (tpnt->loadaddr + tpnt->dynamic_info[DT_INIT]);
-#if defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug) _dl_dprintf(_dl_debug_file,"\ncalling init: %s\n\n", tpnt->libname);
-#endif
- (*dl_elf_func) ();
- }
- if (_dl_atexit && tpnt->dynamic_info[DT_FINI]) {
- void (*dl_elf_func) (void);
- dl_elf_func = (void (*)(void)) (intptr_t) (tpnt->loadaddr + tpnt->dynamic_info[DT_FINI]);
- (*_dl_atexit) (dl_elf_func);
-#if defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug && _dl_on_exit)
- {
- (*_dl_on_exit)(debug_fini, tpnt->libname);
- }
-#endif
- }
-#if defined (__SUPPORT_LD_DEBUG__)
- else {
- if (!_dl_atexit)
- _dl_dprintf(_dl_debug_file, "%s: The address of atexit () is 0x0.\n", tpnt->libname);
-#if 0
- if (!tpnt->dynamic_info[DT_FINI])
- _dl_dprintf(_dl_debug_file, "%s: Invalid .fini section.\n", tpnt->libname);
-#endif
+
+ dl_elf_func = (void (*)(void)) DL_RELOC_ADDR(tpnt->loadaddr, tpnt->dynamic_info[DT_INIT]);
+
+ _dl_if_debug_dprint("calling INIT: %s\n\n", tpnt->libname);
+
+ DL_CALL_FUNC_AT_ADDR (dl_elf_func, tpnt->loadaddr, (void(*)(void)));
}
-#endif
+
+ _dl_run_init_array(tpnt);
}
- /* Notify the debugger that all objects are now mapped in. */
- _dl_debug_addr->r_state = RT_CONSISTENT;
- _dl_debug_state();
-}
+ /* Find the real malloc function and make ldso functions use that from now on */
+ _dl_malloc_function = (void* (*)(size_t)) (intptr_t) _dl_find_hash(__C_SYMBOL_PREFIX__ "malloc",
+ global_scope, NULL, ELF_RTYPE_CLASS_PLT, NULL);
-char *_dl_getenv(const char *symbol, char **envp)
-{
- char *pnt;
- const char *pnt1;
+#if defined(USE_TLS) && USE_TLS
+ /* Find the real functions and make ldso functions use them from now on */
+ _dl_calloc_function = (void* (*)(size_t, size_t)) (intptr_t)
+ _dl_find_hash(__C_SYMBOL_PREFIX__ "calloc", global_scope, NULL, ELF_RTYPE_CLASS_PLT, NULL);
- while ((pnt = *envp++)) {
- pnt1 = symbol;
- while (*pnt && *pnt == *pnt1)
- pnt1++, pnt++;
- if (!*pnt || *pnt != '=' || *pnt1)
- continue;
- return pnt + 1;
- }
- return 0;
-}
+ _dl_realloc_function = (void* (*)(void *, size_t)) (intptr_t)
+ _dl_find_hash(__C_SYMBOL_PREFIX__ "realloc", global_scope, NULL, ELF_RTYPE_CLASS_PLT, NULL);
-void _dl_unsetenv(const char *symbol, char **envp)
-{
- char *pnt;
- const char *pnt1;
- char **newenvp = envp;
+ _dl_free_function = (void (*)(void *)) (intptr_t)
+ _dl_find_hash(__C_SYMBOL_PREFIX__ "free", global_scope, NULL, ELF_RTYPE_CLASS_PLT, NULL);
- for (pnt = *envp; pnt; pnt = *++envp) {
- pnt1 = symbol;
- while (*pnt && *pnt == *pnt1)
- pnt1++, pnt++;
- if (!*pnt || *pnt != '=' || *pnt1)
- *newenvp++ = *envp;
- }
- *newenvp++ = *envp;
- return;
-}
+ _dl_memalign_function = (void* (*)(size_t, size_t)) (intptr_t)
+ _dl_find_hash(__C_SYMBOL_PREFIX__ "memalign", global_scope, NULL, ELF_RTYPE_CLASS_PLT, NULL);
-static int _dl_suid_ok(void)
-{
- __kernel_uid_t uid, euid;
- __kernel_gid_t gid, egid;
+#endif
- uid = _dl_getuid();
- euid = _dl_geteuid();
- gid = _dl_getgid();
- egid = _dl_getegid();
+ /* Notify the debugger that all objects are now mapped in. */
+ _dl_debug_addr->r_state = RT_CONSISTENT;
+ _dl_debug_state();
- if(uid == euid && gid == egid) {
- return 1;
- }
- return 0;
+#ifdef __LDSO_STANDALONE_SUPPORT__
+ if (_start == (void *) auxvt[AT_ENTRY].a_un.a_val)
+ return (void *) app_tpnt->l_entry;
+ else
+#endif
+ return (void *) auxvt[AT_ENTRY].a_un.a_val;
}
-
-#include "hash.c"
-#include "readelflib1.c"
+#include "dl-hash.c"
+#include "dl-elf.c"
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