* after resolving ELF shared library symbols
*
* Copyright (C) 2005 by Joakim Tjernlund
- * Copyright (C) 2000-200
4 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 2000-200
6 by Erik Andersen <andersen@codepoet.org>
* Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
* David Engel, Hongjiu Lu and Mitch D'Souza
*
#define ALLOW_ZERO_PLTGOT
+#if defined(USE_TLS) && USE_TLS
+#include "dl-tls.c"
+#endif
+
/* Pull in the value of _dl_progname */
#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 */
-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
-/* Needed for standalone execution. */
+#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"
-/* Forward function declarations */
-static int _dl_suid_ok(void);
+#include "dl-symbols.c"
+#include "dl-array.c"
/*
* This stub function is used by some debuggers. The idea is that they
* address mapping is changed in some way.
*/
void _dl_debug_state(void);
-void _dl_debug_state()
+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 = 0; /* Lets _dl_malloc use the already allocated memory page */
-static unsigned char *_dl_mmap_zero = 0; /* Also used by _dl_malloc */
+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>
-uintptr_t stack_chk_guard;
+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;
-# ifdef __UCLIBC_HAS_SSP_COMPAT__
-strong_alias(__stack_chk_guard,__guard)
-# endif
-# elif __UCLIBC_HAS_SSP_COMPAT__
+# 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
-static void _dl_run_array_forward(unsigned long array, unsigned long size,
- ElfW(Addr) loadaddr)
+char *_dl_getenv(const char *symbol, char **envp)
{
- if (array != 0) {
- unsigned int j;
- unsigned int jm;
- ElfW(Addr) *addrs;
- jm = size / sizeof (ElfW(Addr));
- addrs = (ElfW(Addr) *) (array + loadaddr);
- for (j = 0; j < jm; ++j) {
- void (*dl_elf_func) (void);
- dl_elf_func = (void (*)(void)) (intptr_t) addrs[j];
- (*dl_elf_func) ();
- }
+ 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_run_init_array(struct elf_resolve *tpnt);
-void _dl_run_init_array(struct elf_resolve *tpnt)
+void _dl_unsetenv(const char *symbol, char **envp)
{
- _dl_run_array_forward(tpnt->dynamic_info[DT_INIT_ARRAY],
- tpnt->dynamic_info[DT_INIT_ARRAYSZ],
- tpnt->loadaddr);
+ 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;
}
-void _dl_app_init_array(void);
-void _dl_app_init_array(void)
+static int _dl_suid_ok(void)
{
- _dl_run_init_array(_dl_loaded_modules);
+ __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;
}
-void _dl_run_fini_array(struct elf_resolve *tpnt);
-void _dl_run_fini_array(struct elf_resolve *tpnt)
+void *_dl_malloc(size_t size)
{
- if (tpnt->dynamic_info[DT_FINI_ARRAY]) {
- ElfW(Addr) *array = (ElfW(Addr) *) (tpnt->loadaddr + tpnt->dynamic_info[DT_FINI_ARRAY]);
- unsigned int i = (tpnt->dynamic_info[DT_FINI_ARRAYSZ] / sizeof(ElfW(Addr)));
- while (i-- > 0) {
- void (*dl_elf_func) (void);
- dl_elf_func = (void (*)(void)) (intptr_t) array[i];
- (*dl_elf_func) ();
+ 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;
}
-void _dl_app_fini_array(void);
-void _dl_app_fini_array(void)
+static void *_dl_zalloc(size_t size)
{
- _dl_run_fini_array(_dl_loaded_modules);
+ 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(USE_TLS) && USE_TLS
+void *_dl_memalign(size_t __boundary, size_t __size)
+{
+ 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
static void __attribute__ ((destructor)) __attribute_used__ _dl_fini(void)
{
- int i;
+ unsigned int i;
struct elf_resolve * tpnt;
for (i = 0; i < nlist; ++i) {
if (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_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_elf_func) ();
+ DL_CALL_FUNC_AT_ADDR (dl_elf_func, tpnt->loadaddr, (void(*)(void)));
}
}
}
-void _dl_get_ready_to_run(struct elf_resolve *tpnt, unsigned long load_addr,
- ElfW(auxv_t) auxvt[AT_EGID + 1], char **envp,
- char **argv)
+#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;
- unsigned int i;
+ 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;
+ 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 *_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 */
- _dl_memset(app_tpnt, 0x00, sizeof(*app_tpnt));
+ _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;
_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 supported yet\n");
+ _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
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
+#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
do {
_dl_unsetenv (nextp, envp);
/* We could use rawmemchr but this need not be fast. */
- nextp = (char *) _dl_strchr(nextp, '\0') + 1;
+ 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;
}
- /* sjhill: your TLS init should go before this */
-#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);
-# ifdef __UCLIBC_HAS_SSP_COMPAT__
- __guard = stack_chk_guard;
-# endif
-# else
- __stack_chk_guard = stack_chk_guard;
-# endif
+#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
+
+#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);
+ }
+ }
+
+ _dl_ldsopath_init(tpnt);
+ } else {
#endif
/* At this point we are now free to examine the user application,
for (idx = 0; idx < auxvt[AT_PHNUM].a_un.a_val; idx++, phdr++)
if (phdr->p_type == PT_PHDR) {
- app_tpnt->loadaddr = (ElfW(Addr)) (auxvt[AT_PHDR].a_un.a_val - phdr->p_vaddr);
+ DL_INIT_LOADADDR_PROG(app_tpnt->loadaddr, auxvt[AT_PHDR].a_un.a_val - phdr->p_vaddr);
break;
}
- if (app_tpnt->loadaddr)
+ if (DL_LOADADDR_BASE(app_tpnt->loadaddr))
_dl_debug_early("Position Independent Executable: "
- "app_tpnt->loadaddr=%x\n", app_tpnt->loadaddr);
+ "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_malloc(sizeof(struct r_debug));
- _dl_memset(debug_addr, 0, sizeof(struct r_debug));
+ 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++) {
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) *) (ppnt->p_vaddr + app_tpnt->loadaddr);
+ 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
_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 *) ((ppnt->p_vaddr + app_tpnt->loadaddr) & PAGE_ALIGN),
- ((ppnt->p_vaddr + app_tpnt->loadaddr) & ADDR_ALIGN) +
+ _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
continue;
#endif
/* OK, we have what we need - slip this one into the list. */
- app_tpnt = _dl_add_elf_hash_table(_dl_progname, (char *)app_tpnt->loadaddr,
- app_tpnt->dynamic_info, ppnt->p_vaddr + app_tpnt->loadaddr, ppnt->p_filesz);
+ 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_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;
lpnt = (unsigned long *) (app_tpnt->dynamic_info[DT_PLTGOT]);
#ifdef ALLOW_ZERO_PLTGOT
if (lpnt)
/* OK, fill this in - we did not have this before */
if (ppnt->p_type == PT_INTERP) {
- char *ptmp;
+ tpnt->libname = (char *) DL_RELOC_ADDR(app_tpnt->loadaddr, ppnt->p_vaddr);
- tpnt->libname = (char *) ppnt->p_vaddr + app_tpnt->loadaddr;
+ _dl_ldsopath_init(tpnt);
+ }
- /* Store the path where the shared lib loader was found
- * for later use
- */
- _dl_ldsopath = _dl_strdup(tpnt->libname);
- ptmp = _dl_strrchr(_dl_ldsopath, '/');
- if (ptmp != _dl_ldsopath)
- *ptmp = '\0';
+ /* 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;
- _dl_debug_early("Lib Loader: (%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;
+#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) {
len1 = _dl_strlen(dl_debug_output);
len2 = _dl_strlen(tmp1);
- filename = _dl_malloc(len1+len2+2);
+ filename = _dl_malloc(len1 + len2 + 2);
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);
+ _dl_debug_file = _dl_open(filename, O_WRONLY|O_CREAT, 0644);
if (_dl_debug_file < 0) {
_dl_debug_file = 2;
_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++;
}
}
#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
_dl_map_cache();
+#ifdef __LDSO_PRELOAD_ENV_SUPPORT__
if (_dl_preload) {
char c, *str, *str2;
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, &rpnt, NULL, str, trace_loaded_objects);
+ 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
} else {
tpnt1->rtld_flags = unlazy | RTLD_GLOBAL;
- _dl_debug_early("Loading: (%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
+ _dl_debug_early("Loading: (%x) %s\n", DL_LOADADDR_BASE(tpnt1->loadaddr), tpnt1->libname);
#ifdef __LDSO_LDD_SUPPORT__
- if (trace_loaded_objects &&
+ if (trace_loaded_objects && !_dl_trace_prelink &&
tpnt1->usage_count == 1) {
/* This is a real hack to make
* ldd not print the library
*/
if (_dl_strcmp(_dl_progname, str) != 0)
_dl_dprintf(1, "\t%s => %s (%x)\n", str, tpnt1->libname,
- tpnt1->loadaddr);
+ DL_LOADADDR_BASE(tpnt1->loadaddr));
}
#endif
}
str++;
}
}
+#endif /* __LDSO_PRELOAD_ENV_SUPPORT__ */
#ifdef __LDSO_PRELOAD_FILE_SUPPORT__
do {
- struct stat st;
char *preload;
int fd;
char c, *cp, *cp2;
+ struct stat st;
if (_dl_stat(LDSO_PRELOAD, &st) || st.st_size == 0) {
break;
tpnt1 = _dl_load_shared_library(0, &rpnt, NULL, cp2, trace_loaded_objects);
if (!tpnt1) {
-#ifdef __LDSO_LDD_SUPPORT__
- if (trace_loaded_objects)
+# ifdef __LDSO_LDD_SUPPORT__
+ if (trace_loaded_objects || _dl_trace_prelink)
_dl_dprintf(1, "\t%s => not found\n", cp2);
else
-#endif
+# 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_debug_early("Loading: (%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
+ _dl_debug_early("Loading: (%x) %s\n", DL_LOADADDR_BASE(tpnt1->loadaddr), tpnt1->libname);
-#ifdef __LDSO_LDD_SUPPORT__
- if (trace_loaded_objects &&
+# 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,
- (unsigned)tpnt1->loadaddr);
+ DL_LOADADDR_BASE(tpnt1->loadaddr));
}
-#endif
+# endif
}
/* find start of next library */
lpntstr = (char*) (tcurr->dynamic_info[DT_STRTAB] + this_dpnt->d_un.d_val);
name = _dl_get_last_path_component(lpntstr);
- if (_dl_strcmp(name, UCLIBC_LDSO) == 0)
- continue;
-
_dl_if_debug_dprint("\tfile='%s'; needed by '%s'\n", lpntstr, _dl_progname);
- 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
tpnt1->rtld_flags = unlazy | RTLD_GLOBAL;
- _dl_debug_early("Loading: (%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
+ _dl_debug_early("Loading: (%x) %s\n", DL_LOADADDR_BASE(tpnt1->loadaddr), tpnt1->libname);
#ifdef __LDSO_LDD_SUPPORT__
- if (trace_loaded_objects &&
+ if (trace_loaded_objects && !_dl_trace_prelink &&
tpnt1->usage_count == 1) {
_dl_dprintf(1, "\t%s => %s (%x)\n",
lpntstr, tpnt1->libname,
- (unsigned)tpnt1->loadaddr);
+ DL_LOADADDR_BASE(tpnt1->loadaddr));
}
#endif
}
}
_dl_unmap_cache();
- --nlist; /* Exclude the application. */
+ /* Keep track of the number of elements in the global scope */
+ nscope_elem = nlist;
+
+ 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 = _dl_loaded_modules->next; tcurr; tcurr = tcurr->next) {
+ 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) {
- int j, k;
+ unsigned int j, k;
for (j = 0; init_fini_list[j] != tcurr; ++j)
/* Empty */;
}
}
#ifdef __SUPPORT_LD_DEBUG__
- if(_dl_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;
* functions in the dynamic linker and to relocate the interpreter
* again once all libs are loaded.
*/
- if (tpnt) {
- ElfW(Ehdr) *epnt = (ElfW(Ehdr) *) auxvt[AT_BASE].a_un.a_val;
- ElfW(Phdr) *myppnt = (ElfW(Phdr) *) (load_addr + epnt->e_phoff);
- int j;
-
- tpnt = _dl_add_elf_hash_table(tpnt->libname, (char *)load_addr,
- tpnt->dynamic_info,
- (unsigned long)tpnt->dynamic_addr,
- 0);
-
- 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 (!ldso_tpnt) {
+ tpnt = add_ldso(tpnt, load_addr, ldso_mapaddr, auxvt, rpnt);
tpnt->usage_count++;
- tpnt->symbol_scope = _dl_symbol_tables;
- 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;
- tpnt->rtld_flags = RTLD_NOW | RTLD_GLOBAL; /* Must not be LAZY */
+ nscope_elem++;
+ } else
+ tpnt = ldso_tpnt;
+
#ifdef RERELOCATE_LDSO
/* Only rerelocate functions for now. */
tpnt->init_flag = RELOCS_DONE;
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");
* order so that COPY directives work correctly.
*/
if (_dl_symbol_tables)
- if (_dl_fixup(_dl_symbol_tables, unlazy))
+ if (_dl_fixup(_dl_symbol_tables, global_scope, unlazy))
_dl_exit(-1);
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);
+ }
+ }
+#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
* ld.so.1, so we have to look up each symbol individually.
*/
- _dl_envp = (unsigned long *) (intptr_t) _dl_find_hash("__environ", _dl_symbol_tables, NULL, 0);
+ _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;
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));
}
}
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]);
+ 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_elf_func) ();
+ DL_CALL_FUNC_AT_ADDR (dl_elf_func, tpnt->loadaddr, (void(*)(void)));
}
_dl_run_init_array(tpnt);
}
/* 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("malloc",
- _dl_symbol_tables, NULL, ELF_RTYPE_CLASS_PLT);
-
- /* Notify the debugger that all objects are now mapped in. */
- _dl_debug_addr->r_state = RT_CONSISTENT;
- _dl_debug_state();
-}
-
-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;
+ _dl_malloc_function = (void* (*)(size_t)) (intptr_t) _dl_find_hash(__C_SYMBOL_PREFIX__ "malloc",
+ 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;
-}
+#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);
-static int _dl_suid_ok(void)
-{
- __kernel_uid_t uid, euid;
- __kernel_gid_t gid, egid;
+ _dl_realloc_function = (void* (*)(void *, size_t)) (intptr_t)
+ _dl_find_hash(__C_SYMBOL_PREFIX__ "realloc", global_scope, NULL, ELF_RTYPE_CLASS_PLT, NULL);
- uid = _dl_getuid();
- euid = _dl_geteuid();
- gid = _dl_getgid();
- egid = _dl_getegid();
+ _dl_free_function = (void (*)(void *)) (intptr_t)
+ _dl_find_hash(__C_SYMBOL_PREFIX__ "free", global_scope, NULL, ELF_RTYPE_CLASS_PLT, NULL);
- if(uid == euid && gid == egid) {
- return 1;
- }
- return 0;
-}
+ _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);
-void *_dl_malloc(int 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 + (unsigned)size > _dl_pagesize) {
- _dl_debug_early("mmapping more memory\n");
- _dl_mmap_zero = _dl_malloc_addr = _dl_mmap((void *) 0, size,
- PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -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;
+ /* Notify the debugger that all objects are now mapped in. */
+ _dl_debug_addr->r_state = RT_CONSISTENT;
+ _dl_debug_state();
- /*
- * Align memory to 4 byte boundary. Some platforms require this,
- * others simply get better performance.
- */
- _dl_malloc_addr = (unsigned char *) (((unsigned long) _dl_malloc_addr + 3) & ~(3));
- return retval;
+#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 "dl-hash.c"
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