/* vi: set sw=4 ts=4: */
-/* Program to load an ELF binary on a linux system, and run it
+/*
+ * Program to load an ELF binary on a linux system, and run it
* after resolving ELF shared library symbols
*
- * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
+ * Copyright (C) 2000-2004 by Erik Andersen <andersen@codpoet.org>
+ * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
* David Engel, Hongjiu Lu and Mitch D'Souza
- * Copyright (C) 2001-2002, Erik Andersen
- *
- * All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* SUCH DAMAGE.
*/
-// Support a list of library preloads in /etc/ld.so.preload
-//#define SUPPORT_LDSO_PRELOAD_FILE
-
-
-/* Disclaimer: I have never seen any AT&T source code for SVr4, nor have
- I ever taken any courses on internals. This program was developed using
- information available through the book "UNIX SYSTEM V RELEASE 4,
- Programmers guide: Ansi C and Programming Support Tools", which did
- a more than adequate job of explaining everything required to get this
- working. */
-
-/*
- * The main trick with this program is that initially, we ourselves are
- * not dynamicly linked. This means that we cannot access any global
- * variables or call any functions. No globals initially, since the
- * Global Offset Table (GOT) is initialized by the linker assuming a
- * virtual address of 0, and no function calls initially since the
- * Procedure Linkage Table (PLT) is not yet initialized.
- *
- * There are additional initial restrictions - we cannot use large
- * switch statements, since the compiler generates tables of addresses
- * and jumps through them. We can use inline functions, because these
- * do not transfer control to a new address, but they must be static so
- * that they are not exported from the modules. We cannot use normal
- * syscall stubs, because these all reference the errno global variable
- * which is not yet initialized. We can use all of the local stack
- * variables that we want.
- *
- * Life is further complicated by the fact that initially we do not
- * want to do a complete dynamic linking. We want to allow the user to
- * supply new functions to override symbols (i.e. weak symbols and/or
- * LD_PRELOAD). So initially, we only perform relocations for
- * variables that start with "_dl_" since ANSI specifies that the user
- * is not supposed to redefine any of these variables.
- *
- * Fortunately, the linker itself leaves a few clues lying around, and
- * when the kernel starts the image, there are a few further clues.
- * First of all, there is Auxiliary Vector Table information sitting on
- * which is provided to us by the kernel, and which includes
- * information about the load address that the program interpreter was
- * loaded at, the number of sections, the address the application was
- * loaded at and so forth. Here this information is stored in the
- * array auxvt. For details see linux/fs/binfmt_elf.c where it calls
- * NEW_AUX_ENT() a bunch of time....
- *
- * Next, we need to find the GOT. On most arches there is a register
- * pointing to the GOT, but just in case (and for new ports) I've added
- * some (slow) C code to locate the GOT for you.
- *
- * This code was originally written for SVr4, and there the kernel
- * would load all text pages R/O, so they needed to call mprotect a
- * zillion times to mark all text pages as writable so dynamic linking
- * would succeed. Then when they were done, they would change the
- * protections for all the pages back again. Well, under Linux
- * everything is loaded writable (since Linux does copy on write
- * anyways) so all the mprotect stuff has been disabled.
- *
- * Initially, we do not have access to _dl_malloc since we can't yet
- * make function calls, so we mmap one page to use as scratch space.
- * Later on, when we can call _dl_malloc we reuse this this memory.
- * This is also beneficial, since we do not want to use the same memory
- * pool as malloc anyway - esp if the user redefines malloc to do
- * something funky.
- *
- * Our first task is to perform a minimal linking so that we can call
- * other portions of the dynamic linker. Once we have done this, we
- * then build the list of modules that the application requires, using
- * LD_LIBRARY_PATH if this is not a suid program (/usr/lib otherwise).
- * Once this is done, we can do the dynamic linking as required, and we
- * must omit the things we did to get the dynamic linker up and running
- * in the first place. After we have done this, we just have a few
- * housekeeping chores and we can transfer control to the user's
- * application.
- */
-
#include "ldso.h"
-
+#include "unsecvars.h"
#define ALLOW_ZERO_PLTGOT
-/* Some arches may need to override this in boot1_arch.h */
-#define ELFMAGIC ELFMAG
+/* Pull in the value of _dl_progname */
+#include "dl-progname.h"
-/* This is a poor man's malloc, used prior to resolving our internal poor man's malloc */
-#define LD_MALLOC(SIZE) ((void *) (malloc_buffer += SIZE, malloc_buffer - SIZE)) ; REALIGN();
-/*
- * Make sure that the malloc buffer is aligned on 4 byte boundary. For 64 bit
- * platforms we may need to increase this to 8, but this is good enough for
- * now. This is typically called after LD_MALLOC.
- */
-#define REALIGN() malloc_buffer = (unsigned char *) (((unsigned long) malloc_buffer + 3) & ~(3))
+/* 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? */
+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;
-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;
#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 = 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;
-int _dl_debug_file = 2;
-#else
-#define _dl_debug_file 2
-#endif
-static unsigned char *_dl_malloc_addr, *_dl_mmap_zero;
-
-static int _dl_secure = 0;
-static int (*_dl_elf_main) (int, char **, char **);
-struct r_debug *_dl_debug_addr = NULL;
-unsigned long *_dl_brkp;
-unsigned long *_dl_envp;
-int _dl_fixup(struct dyn_elf *rpnt, int flag);
-void _dl_debug_state(void);
-char *_dl_get_last_path_component(char *path);
-
-#include "boot1_arch.h"
-#include "_dl_progname.h" /* Pull in the value of _dl_progname */
-
-/* When we enter this piece of code, the program stack looks like this:
- argc argument counter (integer)
- argv[0] program name (pointer)
- argv[1...N] program args (pointers)
- argv[argc-1] end of args (integer)
- NULL
- env[0...N] environment variables (pointers)
- NULL
- auxvt[0...N] Auxiliary Vector Table elements (mixed types)
-*/
-
-LD_BOOT(unsigned long args) __attribute__ ((unused));
-LD_BOOT(unsigned long args)
-{
- unsigned int argc;
- char **argv, **envp;
- unsigned long load_addr;
- unsigned long *got;
- unsigned long *aux_dat;
- int goof = 0;
- ElfW(Ehdr) *header;
- struct elf_resolve *tpnt;
- struct elf_resolve *app_tpnt;
- Elf32_auxv_t auxvt[AT_EGID + 1];
- unsigned char *malloc_buffer, *mmap_zero;
- Elf32_Dyn *dpnt;
- unsigned long *hash_addr;
- struct r_debug *debug_addr = NULL;
- int indx;
- int status;
-
-
- /* WARNING! -- we cannot make _any_ funtion calls until we have
- * taken care of fixing up our own relocations. Making static
- * inline calls is ok, but _no_ function calls. Not yet
- * anyways. */
-
- /* First obtain the information on the stack that tells us more about
- what binary is loaded, where it is loaded, etc, etc */
- GET_ARGV(aux_dat, args);
-#if defined (__arm__) || defined (__mips__) || defined (__cris__)
- aux_dat += 1;
-#endif
- argc = *(aux_dat - 1);
- argv = (char **) aux_dat;
- aux_dat += argc; /* Skip over the argv pointers */
- aux_dat++; /* Skip over NULL at end of argv */
- envp = (char **) aux_dat;
- while (*aux_dat)
- aux_dat++; /* Skip over the envp pointers */
- aux_dat++; /* Skip over NULL at end of envp */
-
- /* Place -1 here as a checkpoint. We later check if it was changed
- * when we read in the auxvt */
- auxvt[AT_UID].a_type = -1;
-
- /* The junk on the stack immediately following the environment is
- * the Auxiliary Vector Table. Read out the elements of the auxvt,
- * sort and store them in auxvt for later use. */
- while (*aux_dat) {
- Elf32_auxv_t *auxv_entry = (Elf32_auxv_t *) aux_dat;
-
- if (auxv_entry->a_type <= AT_EGID) {
- _dl_memcpy(&(auxvt[auxv_entry->a_type]), auxv_entry, sizeof(Elf32_auxv_t));
- }
- aux_dat += 2;
- }
-
- /* locate the ELF header. We need this done as soon as possible
- * (esp since SEND_STDERR() needs this on some platforms... */
- load_addr = auxvt[AT_BASE].a_un.a_val;
- header = (ElfW(Ehdr) *) auxvt[AT_BASE].a_un.a_ptr;
-
- /* Check the ELF header to make sure everything looks ok. */
- if (!header || header->e_ident[EI_CLASS] != ELFCLASS32 ||
- header->e_ident[EI_VERSION] != EV_CURRENT
-#if !defined(__powerpc__) && !defined(__mips__) && !defined(__sh__)
- || _dl_strncmp((void *) header, ELFMAGIC, SELFMAG) != 0
-#else
- || header->e_ident[EI_MAG0] != ELFMAG0
- || header->e_ident[EI_MAG1] != ELFMAG1
- || header->e_ident[EI_MAG2] != ELFMAG2
- || header->e_ident[EI_MAG3] != ELFMAG3
-#endif
- ) {
- SEND_STDERR("Invalid ELF header\n");
- _dl_exit(0);
- }
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("ELF header=");
- SEND_ADDRESS_STDERR(load_addr, 1);
-#endif
-
-
- /* Locate the global offset table. Since this code must be PIC
- * we can take advantage of the magic offset register, if we
- * happen to know what that is for this architecture. If not,
- * we can always read stuff out of the ELF file to find it... */
-#if defined(__i386__)
- __asm__("\tmovl %%ebx,%0\n\t":"=a"(got));
-#elif defined(__m68k__)
- __asm__("movel %%a5,%0":"=g"(got));
-#elif defined(__sparc__)
- __asm__("\tmov %%l7,%0\n\t":"=r"(got));
-#elif defined(__arm__)
- __asm__("\tmov %0, r10\n\t":"=r"(got));
-#elif defined(__powerpc__)
- __asm__("\tbl _GLOBAL_OFFSET_TABLE_-4@local\n\t":"=l"(got));
-#elif defined(__mips__)
- __asm__("\tmove %0, $28\n\tsubu %0,%0,0x7ff0\n\t":"=r"(got));
-#elif defined(__sh__) && !defined(__SH5__)
- __asm__(
-" mov.l 1f, %0\n"
-" mova 1f, r0\n"
-" bra 2f\n"
-" add r0, %0\n"
-" .balign 4\n"
-"1: .long _GLOBAL_OFFSET_TABLE_\n"
-"2:" : "=r" (got) : : "r0");
-#elif defined(__cris__)
- __asm__("\tmove.d $pc,%0\n\tsub.d .:GOTOFF,%0\n\t":"=r"(got));
-#else
- /* Do things the slow way in C */
- {
- unsigned long tx_reloc;
- Elf32_Dyn *dynamic = NULL;
- Elf32_Shdr *shdr;
- Elf32_Phdr *pt_load;
-
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("Finding the GOT using C code to read the ELF file\n");
-#endif
- /* Find where the dynamic linking information section is hiding */
- shdr = (Elf32_Shdr *) (header->e_shoff + (char *) header);
- for (indx = header->e_shnum; --indx >= 0; ++shdr) {
- if (shdr->sh_type == SHT_DYNAMIC) {
- goto found_dynamic;
- }
- }
- SEND_STDERR("missing dynamic linking information section \n");
- _dl_exit(0);
-
- found_dynamic:
- dynamic = (Elf32_Dyn *) (shdr->sh_offset + (char *) header);
-
- /* Find where PT_LOAD is hiding */
- pt_load = (Elf32_Phdr *) (header->e_phoff + (char *) header);
- for (indx = header->e_phnum; --indx >= 0; ++pt_load) {
- if (pt_load->p_type == PT_LOAD) {
- goto found_pt_load;
- }
- }
- SEND_STDERR("missing loadable program segment\n");
- _dl_exit(0);
-
- found_pt_load:
- /* Now (finally) find where DT_PLTGOT is hiding */
- tx_reloc = pt_load->p_vaddr - pt_load->p_offset;
- for (; DT_NULL != dynamic->d_tag; ++dynamic) {
- if (dynamic->d_tag == DT_PLTGOT) {
- goto found_got;
- }
- }
- SEND_STDERR("missing global offset table\n");
- _dl_exit(0);
-
- found_got:
- got = (unsigned long *) (dynamic->d_un.d_val - tx_reloc +
- (char *) header);
- }
-#endif
-
- /* Now, finally, fix up the location of the dynamic stuff */
- dpnt = (Elf32_Dyn *) (*got + load_addr);
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("First Dynamic section entry=");
- SEND_ADDRESS_STDERR(dpnt, 1);
-#endif
-
-
- /* Call mmap to get a page of writable memory that can be used
- * for _dl_malloc throughout the shared lib loader. */
- mmap_zero = malloc_buffer = _dl_mmap((void *) 0, PAGE_SIZE,
- PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
- if (_dl_mmap_check_error(mmap_zero)) {
- SEND_STDERR("dl_boot: mmap of a spare page failed!\n");
- _dl_exit(13);
- }
-
- tpnt = LD_MALLOC(sizeof(struct elf_resolve));
- _dl_memset(tpnt, 0, sizeof(struct elf_resolve));
- app_tpnt = LD_MALLOC(sizeof(struct elf_resolve));
- _dl_memset(app_tpnt, 0, sizeof(struct elf_resolve));
-
-#ifdef __UCLIBC_PIE_SUPPORT__
- /* Find the runtime load address of the main executable, this may be
- * different from what the ELF header says for ET_DYN/PIE executables.
- */
- {
- ElfW(Phdr) *ppnt;
- int i;
-
- ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_ptr;
- for (i = 0; i < auxvt[AT_PHNUM].a_un.a_val; i++, ppnt++)
- if (ppnt->p_type == PT_PHDR) {
- app_tpnt->loadaddr = (ElfW(Addr)) (auxvt[AT_PHDR].a_un.a_val - ppnt->p_vaddr);
- break;
- }
- }
-
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("app_tpnt->loadaddr=");
- SEND_ADDRESS_STDERR(app_tpnt->loadaddr, 1);
-#endif
-#endif
-
- /*
- * This is used by gdb to locate the chain of shared libraries that are currently loaded.
- */
- debug_addr = LD_MALLOC(sizeof(struct r_debug));
- _dl_memset(debug_addr, 0, sizeof(struct r_debug));
-
- /* OK, that was easy. Next scan the DYNAMIC section of the image.
- We are only doing ourself right now - we will have to do the rest later */
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("scanning DYNAMIC section\n");
-#endif
- while (dpnt->d_tag) {
-#if defined(__mips__)
- if (dpnt->d_tag == DT_MIPS_GOTSYM)
- tpnt->mips_gotsym = (unsigned long) dpnt->d_un.d_val;
- if (dpnt->d_tag == DT_MIPS_LOCAL_GOTNO)
- tpnt->mips_local_gotno = (unsigned long) dpnt->d_un.d_val;
- if (dpnt->d_tag == DT_MIPS_SYMTABNO)
- tpnt->mips_symtabno = (unsigned long) dpnt->d_un.d_val;
-#endif
- if (dpnt->d_tag < 24) {
- tpnt->dynamic_info[dpnt->d_tag] = dpnt->d_un.d_val;
- if (dpnt->d_tag == DT_TEXTREL) {
- tpnt->dynamic_info[DT_TEXTREL] = 1;
- }
- }
- dpnt++;
- }
-
- {
- ElfW(Phdr) *ppnt;
- int i;
-
- ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_ptr;
- for (i = 0; i < auxvt[AT_PHNUM].a_un.a_val; i++, ppnt++)
- if (ppnt->p_type == PT_DYNAMIC) {
-#ifndef __UCLIBC_PIE_SUPPORT__
- dpnt = (Elf32_Dyn *) ppnt->p_vaddr;
-#else
- dpnt = (Elf32_Dyn *) (ppnt->p_vaddr + app_tpnt->loadaddr);
-#endif
- while (dpnt->d_tag) {
-#if defined(__mips__)
- if (dpnt->d_tag == DT_MIPS_GOTSYM)
- app_tpnt->mips_gotsym =
- (unsigned long) dpnt->d_un.d_val;
- if (dpnt->d_tag == DT_MIPS_LOCAL_GOTNO)
- app_tpnt->mips_local_gotno =
- (unsigned long) dpnt->d_un.d_val;
- if (dpnt->d_tag == DT_MIPS_SYMTABNO)
- app_tpnt->mips_symtabno =
- (unsigned long) dpnt->d_un.d_val;
- if (dpnt->d_tag > DT_JMPREL) {
- dpnt++;
- continue;
- }
- app_tpnt->dynamic_info[dpnt->d_tag] = dpnt->d_un.d_val;
-
-#warning "Debugging threads on mips won't work till someone fixes this..."
-#if 0
- if (dpnt->d_tag == DT_DEBUG) {
- dpnt->d_un.d_val = (unsigned long) debug_addr;
- }
-#endif
-
-#else
- if (dpnt->d_tag > DT_JMPREL) {
- dpnt++;
- continue;
- }
- app_tpnt->dynamic_info[dpnt->d_tag] = dpnt->d_un.d_val;
- if (dpnt->d_tag == DT_DEBUG) {
- dpnt->d_un.d_val = (unsigned long) debug_addr;
- }
-#endif
- if (dpnt->d_tag == DT_TEXTREL)
- app_tpnt->dynamic_info[DT_TEXTREL] = 1;
- dpnt++;
- }
- }
- }
-
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("done scanning DYNAMIC section\n");
-#endif
-
- /* Get some more of the information that we will need to dynamicly link
- this module to itself */
-
- hash_addr = (unsigned long *) (tpnt->dynamic_info[DT_HASH] + load_addr);
- tpnt->nbucket = *hash_addr++;
- tpnt->nchain = *hash_addr++;
- tpnt->elf_buckets = hash_addr;
- hash_addr += tpnt->nbucket;
-
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("done grabbing link information\n");
-#endif
-
-#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 */
-
- {
- ElfW(Phdr) *ppnt;
- int i;
-
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("calling mprotect on the shared library/dynamic linker\n");
-#endif
-
- /* First cover the shared library/dynamic linker. */
- if (tpnt->dynamic_info[DT_TEXTREL]) {
- header = (ElfW(Ehdr) *) auxvt[AT_BASE].a_un.a_ptr;
- ppnt = (ElfW(Phdr) *) ((int)auxvt[AT_BASE].a_un.a_ptr +
- header->e_phoff);
- for (i = 0; i < header->e_phnum; i++, ppnt++) {
- if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W)) {
- _dl_mprotect((void *) (load_addr + (ppnt->p_vaddr & PAGE_ALIGN)),
- (ppnt->p_vaddr & ADDR_ALIGN) + (unsigned long) ppnt->p_filesz,
- PROT_READ | PROT_WRITE | PROT_EXEC);
- }
- }
- }
-
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("calling mprotect on the application program\n");
-#endif
- /* Now cover the application program. */
- if (app_tpnt->dynamic_info[DT_TEXTREL]) {
- ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_ptr;
- for (i = 0; i < auxvt[AT_PHNUM].a_un.a_val; i++, ppnt++) {
- if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W))
-#ifndef __UCLIBC_PIE_SUPPORT__
- _dl_mprotect((void *) (ppnt->p_vaddr & PAGE_ALIGN),
- (ppnt->p_vaddr & ADDR_ALIGN) +
-#else
- _dl_mprotect((void *) ((ppnt->p_vaddr + app_tpnt->loadaddr) & PAGE_ALIGN),
- ((ppnt->p_vaddr + app_tpnt->loadaddr) & ADDR_ALIGN) +
-#endif
- (unsigned long) ppnt->p_filesz,
- PROT_READ | PROT_WRITE | PROT_EXEC);
- }
- }
- }
-#endif
-
-#if defined(__mips__)
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("About to do MIPS specific GOT bootstrap\n");
-#endif
- /* For MIPS we have to do stuff to the GOT before we do relocations. */
- PERFORM_BOOTSTRAP_GOT(got);
-#endif
-
- /* OK, now do the relocations. We do not do a lazy binding here, so
- that once we are done, we have considerably more flexibility. */
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("About to do library loader relocations\n");
-#endif
-
- goof = 0;
- for (indx = 0; indx < 2; indx++) {
- unsigned int i;
- ELF_RELOC *rpnt;
- unsigned long *reloc_addr;
- unsigned long symbol_addr;
- int symtab_index;
- unsigned long rel_addr, rel_size;
-
-
- rel_addr = (indx ? tpnt->dynamic_info[DT_JMPREL] : tpnt->
- dynamic_info[DT_RELOC_TABLE_ADDR]);
- rel_size = (indx ? tpnt->dynamic_info[DT_PLTRELSZ] : tpnt->
- dynamic_info[DT_RELOC_TABLE_SIZE]);
-
- if (!rel_addr)
- continue;
-
- /* Now parse the relocation information */
- rpnt = (ELF_RELOC *) (rel_addr + load_addr);
- for (i = 0; i < rel_size; i += sizeof(ELF_RELOC), rpnt++) {
- reloc_addr = (unsigned long *) (load_addr + (unsigned long) rpnt->r_offset);
- symtab_index = ELF32_R_SYM(rpnt->r_info);
- symbol_addr = 0;
- if (symtab_index) {
- char *strtab;
- Elf32_Sym *symtab;
-
- symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + load_addr);
- strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + load_addr);
-
- /* We only do a partial dynamic linking right now. The user
- is not supposed to redefine any symbols that start with
- a '_', so we can do this with confidence. */
- if (!_dl_symbol(strtab + symtab[symtab_index].st_name))
- continue;
- symbol_addr = load_addr + symtab[symtab_index].st_value;
-
- if (!symbol_addr) {
- /* This will segfault - you cannot call a function until
- * we have finished the relocations.
- */
- SEND_STDERR("ELF dynamic loader - unable to self-bootstrap - symbol ");
- SEND_STDERR(strtab + symtab[symtab_index].st_name);
- SEND_STDERR(" undefined.\n");
- goof++;
- }
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("About to fixup symbol: ");
- SEND_STDERR(strtab + symtab[symtab_index].st_name);
- SEND_STDERR("\n");
-#endif
- PERFORM_BOOTSTRAP_RELOC(rpnt, reloc_addr, symbol_addr, load_addr, &symtab[symtab_index]);
- } else {
- /*
- * Use this machine-specific macro to perform the actual relocation.
- */
- PERFORM_BOOTSTRAP_RELOC(rpnt, reloc_addr, symbol_addr, load_addr, NULL);
- }
- }
- }
-
- if (goof) {
- _dl_exit(14);
- }
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- /* Wahoo!!! */
- _dl_dprintf(_dl_debug_file, "Done relocating library loader, so we can now\n\tuse globals and make function calls!\n");
+int _dl_debug_file = 2;
#endif
- if (argv[0]) {
- _dl_progname = argv[0];
- }
-
- /* 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. */
-
- /* Make it so _dl_malloc can use the page of memory we have already
- * allocated, so we shouldn't need to grab any more memory */
- _dl_malloc_addr = malloc_buffer;
- _dl_mmap_zero = mmap_zero;
-
+#include "dl-startup.c"
+/* Forward function declarations */
+static int _dl_suid_ok(void);
-
- /* 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. */
- _dl_get_ready_to_run(tpnt, app_tpnt, load_addr, hash_addr,
- auxvt, envp, debug_addr, malloc_buffer, mmap_zero, argv);
-
-
- /* Transfer control to the application. */
- status = 0; /* Used on x86, but not on other arches */
-#if defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug) _dl_dprintf(_dl_debug_file,"\ntransfering control: %s\n\n", _dl_progname);
-#endif
- _dl_elf_main = (int (*)(int, char **, char **)) auxvt[AT_ENTRY].a_un.a_fcn;
- START();
+/*
+ * 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)
+{
}
+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 */
+
#if defined (__SUPPORT_LD_DEBUG__)
static void debug_fini (int status, void *arg)
{
(void)status;
_dl_dprintf(_dl_debug_file,"\ncalling fini: %s\n\n", (const char*)arg);
}
-#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)
+#endif
+void _dl_get_ready_to_run(struct elf_resolve *tpnt, unsigned long load_addr,
+ Elf32_auxv_t auxvt[AT_EGID + 1], char **envp,
+ char **argv)
{
ElfW(Phdr) *ppnt;
+ Elf32_Dyn *dpnt;
char *lpntstr;
- int i, goof = 0, be_lazy = RTLD_LAZY, trace_loaded_objects = 0;
+ int i, nlist, goof = 0, unlazy = 0, trace_loaded_objects = 0;
+ struct elf_resolve **init_fini_list;
struct dyn_elf *rpnt;
struct elf_resolve *tcurr;
struct elf_resolve *tpnt1;
- unsigned long brk_addr, *lpnt;
+ struct elf_resolve app_tpnt_tmp;
+ struct elf_resolve *app_tpnt = &app_tpnt_tmp;
+ struct r_debug *debug_addr;
+ unsigned long *lpnt;
int (*_dl_atexit) (void *);
+ unsigned long *_dl_envp; /* The environment address */
+ ElfW(Addr) relro_addr = 0;
+ size_t relro_size = 0;
#if defined (__SUPPORT_LD_DEBUG__)
int (*_dl_on_exit) (void (*FUNCTION)(int STATUS, void *ARG),void*);
#endif
#ifdef __SUPPORT_LD_DEBUG_EARLY__
- /* Wahoo!!! */
- SEND_STDERR("Cool, we managed to make a function call.\n");
+ /* Wahoo!!! */
+ SEND_STDERR("Cool, we managed to make a function call.\n");
#endif
+ /* 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;
/* 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];
}
/* 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;
-
-#ifdef ALLOW_ZERO_PLTGOT
- if (tpnt->dynamic_info[DT_PLTGOT])
-#endif
- {
- INIT_GOT(lpnt, tpnt);
-#ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "GOT found at %x\n", lpnt);
-#endif
- }
+ * will need to properly deal with that as well.
+ */
+ rpnt = NULL;
+ if (_dl_getenv("LD_BIND_NOW", envp))
+ unlazy = RTLD_NOW;
- /* OK, this was a big step, now we need to scan all of the user images
- and load them properly. */
+ /* 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.
+ */
+ /* Find the runtime load address of the main executable. This may be
+ * different from what the ELF header says for ET_DYN/PIE executables.
+ */
{
- ElfW(Ehdr) *epnt;
- ElfW(Phdr) *myppnt;
- int j;
+ int i;
+ ElfW(Phdr) *ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_ptr;
- 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;
+ for (i = 0; i < auxvt[AT_PHNUM].a_un.a_val; i++, ppnt++)
+ if (ppnt->p_type == PT_PHDR) {
+ app_tpnt->loadaddr = (ElfW(Addr)) (auxvt[AT_PHDR].a_un.a_val - ppnt->p_vaddr);
+ break;
}
+
+#ifdef __SUPPORT_LD_DEBUG_EARLY__
+ if (app_tpnt->loadaddr) {
+ SEND_STDERR("Position Independent Executable: app_tpnt->loadaddr=");
+ SEND_ADDRESS_STDERR(app_tpnt->loadaddr, 1);
}
+#endif
}
- brk_addr = 0;
- rpnt = NULL;
-
- /* 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 */
+ /*
+ * 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));
ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_ptr;
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 (ppnt->p_type == PT_DYNAMIC) {
+ dpnt = (Elf32_Dyn *) (ppnt->p_vaddr + app_tpnt->loadaddr);
+ _dl_parse_dynamic_info(dpnt, app_tpnt->dynamic_info, debug_addr);
+#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.
+ */
+#ifdef __SUPPORT_LD_DEBUG_EARLY__
+ SEND_STDERR("calling mprotect on the application program\n");
+#endif
+ /* Now cover the application program. */
+ if (app_tpnt->dynamic_info[DT_TEXTREL]) {
+ ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_ptr;
+ 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) +
+ (unsigned long) ppnt->p_filesz,
+ PROT_READ | PROT_WRITE | PROT_EXEC);
+ }
+ }
+#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 = _dl_add_elf_hash_table(_dl_progname, (char *)app_tpnt->loadaddr,
app_tpnt->dynamic_info, ppnt->p_vaddr + app_tpnt->loadaddr, ppnt->p_filesz);
-#endif
_dl_loaded_modules->libtype = elf_executable;
_dl_loaded_modules->ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_ptr;
_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));
rpnt->dyn = _dl_loaded_modules;
+ 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) {
+ 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));
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);
+ _dl_dprintf(_dl_debug_file,
+ "changing tpnt->libname from '%s' to '%s'\n",
+ tpnt->libname, buf);
#endif
tpnt->libname = _dl_strdup(buf);
}
}
- /* Store the path where the shared lib loader was found for
- * later use */
+ /* 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) {
_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_dprintf(_dl_debug_file, "Lib Loader:\t(%x) %s\n",
+ tpnt->loadaddr, tpnt->libname);
#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;
- }
+ * Note that for SUID programs we ignore the settings in
+ * LD_LIBRARY_PATH.
+ */
+ 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 {
+ 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 = (char *) _dl_strchr(nextp, '\0') + 1;
+ } while (*nextp != '\0');
+ _dl_preload = NULL;
+ _dl_library_path = NULL;
}
#ifdef __SUPPORT_LD_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_detail = _dl_strstr(_dl_debug, "detail");
- _dl_debug_move = _dl_strstr(_dl_debug, "move");
- _dl_debug_symbols = _dl_strstr(_dl_debug, "sym");
- _dl_debug_reloc = _dl_strstr(_dl_debug, "reloc");
- _dl_debug_nofixups = _dl_strstr(_dl_debug, "nofix");
- _dl_debug_bindings = _dl_strstr(_dl_debug, "bind");
- }
+ _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 = (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_reloc = _dl_strstr(_dl_debug, "reloc");
+ _dl_debug_nofixups = _dl_strstr(_dl_debug, "nofix");
+ _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)
- {
- char tmp[22], *tmp1, *filename;
- int len1, len2;
-
- _dl_memset(tmp, 0, sizeof(tmp));
- 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);
-
- 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);
- if (_dl_debug_file<0)
- {
- _dl_debug_file = 2;
- _dl_dprintf (2, "can't open file: '%s'\n",filename);
- }
- }
- }
+ const char *dl_debug_output;
+
+ dl_debug_output = _dl_getenv("LD_DEBUG_OUTPUT", envp);
+
+ 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());
+
+ len1 = _dl_strlen(dl_debug_output);
+ len2 = _dl_strlen(tmp1);
+
+ 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);
+ if (_dl_debug_file < 0) {
+ _dl_debug_file = 2;
+ _dl_dprintf (2, "can't open file: '%s'\n",filename);
+ }
+ }
+ }
}
-
-
-#endif
+#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");
_dl_debug_state();
/* 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)
- {
+ 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 (!_dl_secure || _dl_strchr(str, '/') == NULL) {
+ if ((tpnt1 = _dl_check_if_named_library_is_loaded(str, trace_loaded_objects))) {
+ tpnt1->usage_count++;
+ goto next_lib;
}
+
#if defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tfile='%s'; needed by '%s'\n",
- str, _dl_progname);
+ 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 (!tpnt1) {
#ifdef __LDSO_LDD_SUPPORT__
if (trace_loaded_objects)
_dl_dprintf(1, "\t%s => not found\n", str);
- else
+ else
#endif
{
_dl_dprintf(2, "%s: can't load " "library '%s'\n", _dl_progname, str);
_dl_exit(15);
}
} else {
+ tpnt1->rtld_flags = unlazy | RTLD_GLOBAL;
+
#ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "Loading:\t(%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
+ _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) {
- /* this is a real hack to make ldd not print
- * the library itself when run on a library. */
+ 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 (_dl_strcmp(_dl_progname, str) != 0)
- _dl_dprintf(1, "\t%s => %s (%x)\n", str, tpnt1->libname,
- (unsigned) tpnt1->loadaddr);
+ _dl_dprintf(1, "\t%s => %s (%x)\n", str, tpnt1->libname,
+ (unsigned)tpnt1->loadaddr);
}
#endif
}
}
+
+next_lib:
*str2 = c;
str = str2;
while (*str == ':' || *str == ' ' || *str == '\t')
}
}
-#ifdef SUPPORT_LDSO_PRELOAD_FILE
- {
- int fd;
+#ifdef __LDSO_PRELOAD_FILE_SUPPORT__
+ do {
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);
+ int fd;
+ char c, *cp, *cp2;
+
+ if (_dl_stat(LDSO_PRELOAD, &st) || st.st_size == 0) {
+ break;
+ }
+
+ if ((fd = _dl_open(LDSO_PRELOAD, O_RDONLY, 0)) < 0) {
+ _dl_dprintf(2, "%s: can't open file '%s'\n",
+ _dl_progname, LDSO_PRELOAD);
+ break;
+ }
+
+ 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);
+ break;
+ }
+
+ /* 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 {
- 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++;
- }
- }
+ cp++;
+ }
+ }
- /* find start of first library */
- for (cp = preload; *cp && *cp == ' '; cp++)
- /*nada */ ;
+ /* 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';
+ while (*cp) {
+ /* find end of library */
+ for (cp2 = cp; *cp && *cp != ' '; cp++)
+ /*nada */ ;
+ c = *cp;
+ *cp = '\0';
+
+ if ((tpnt1 = _dl_check_if_named_library_is_loaded(cp2, trace_loaded_objects))) {
+ tpnt1->usage_count++;
+ goto next_lib2;
+ }
- 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);
+ 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) {
+
+ 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
+ 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 {
+ {
+ _dl_dprintf(2, "%s: can't load library '%s'\n", _dl_progname, cp2);
+ _dl_exit(15);
+ }
+ } else {
+ tpnt1->rtld_flags = unlazy | RTLD_GLOBAL;
+
#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);
- }
+ _dl_dprintf(_dl_debug_file,
+ "Loading:\t(%x) %s\n",
+ tpnt1->loadaddr, tpnt1->libname);
#endif
- }
- /* find start of next library */
- *cp = c;
- for ( /*nada */ ; *cp && *cp == ' '; cp++)
- /*nada */ ;
- }
-
- _dl_munmap(preload, st.st_size + 1);
+#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
}
+
+next_lib2:
+ /* find start of next library */
+ *cp = c;
+ for ( /*nada */ ; *cp && *cp == ' '; cp++)
+ /*nada */ ;
}
- }
-#endif
- for (tcurr = _dl_loaded_modules; tcurr; tcurr = tcurr->next)
- {
+ _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) {
Elf32_Dyn *dpnt;
- for (dpnt = (Elf32_Dyn *) tcurr->dynamic_addr; dpnt->d_tag; dpnt++)
- {
- if (dpnt->d_tag == DT_NEEDED)
- {
+
+ nlist++;
+ for (dpnt = (Elf32_Dyn *) tcurr->dynamic_addr; dpnt->d_tag; dpnt++) {
+ if (dpnt->d_tag == DT_NEEDED) {
char *name;
+ struct init_fini_list *tmp;
+
lpntstr = (char*) (tcurr->loadaddr + tcurr->dynamic_info[DT_STRTAB] + dpnt->d_un.d_val);
name = _dl_get_last_path_component(lpntstr);
- if ((tpnt1 = _dl_check_if_named_library_is_loaded(name, trace_loaded_objects)))
- {
- continue;
+ if ((tpnt1 = _dl_check_if_named_library_is_loaded(name, trace_loaded_objects))) {
+ tpnt1->usage_count++;
}
+
#if defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tfile='%s'; needed by '%s'\n",
- lpntstr, _dl_progname);
+ 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 (!tpnt1) {
+ if (!(tpnt1 = _dl_load_shared_library(0, &rpnt, tcurr, lpntstr, trace_loaded_objects))) {
#ifdef __LDSO_LDD_SUPPORT__
- if (trace_loaded_objects) {
- _dl_dprintf(1, "\t%s => not found\n", lpntstr);
- continue;
- } else
+ if (trace_loaded_objects) {
+ _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_exit(16);
+ {
+ _dl_dprintf(2, "%s: can't load library '%s'\n", _dl_progname, lpntstr);
+ _dl_exit(16);
+ }
}
- } else {
+ }
+
+ 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;
+
#ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "Loading:\t(%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
+ _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", lpntstr, tpnt1->libname,
- (unsigned) tpnt1->loadaddr);
- }
-#endif
+ if (trace_loaded_objects &&
+ tpnt1->usage_count == 1) {
+ _dl_dprintf(1, "\t%s => %s (%x)\n",
+ lpntstr, tpnt1->libname,
+ (unsigned)tpnt1->loadaddr);
}
+#endif
}
}
}
+ _dl_unmap_cache();
+ --nlist; /* Exclude the application. */
- _dl_unmap_cache();
+ /* As long as atexit() is used to run the FINI functions, we can use
+ * alloca here. The use of atexit() should go away at some time as that
+ * will make Valgring happy.
+ */
+ init_fini_list = alloca(nlist * sizeof(struct elf_resolve *));
+ i = 0;
+ for (tcurr = _dl_loaded_modules->next; 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;
+
+ 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];
+#ifdef __SUPPORT_LD_DEBUG__
+ if(_dl_debug)
+ _dl_dprintf(2, "Move %s from pos %d to %d in INIT/FINI list.\n", here->libname, k, j);
+#endif
+ 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(2, "\nINIT/FINI order and dependencies:\n");
+ for (i = 0; i < nlist; i++) {
+ struct init_fini_list *tmp;
+
+ _dl_dprintf(2, "lib: %s has deps:\n",
+ init_fini_list[i]->libname);
+ tmp = init_fini_list[i]->init_fini;
+ for (; tmp; tmp = tmp->next)
+ _dl_dprintf(2, " %s ", tmp->tpnt->libname);
+ _dl_dprintf(2, "\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;
- tpnt->usage_count++;
+ ElfW(Ehdr) *epnt = (ElfW(Ehdr) *) auxvt[AT_BASE].a_un.a_ptr;
+ 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);
- if (tcurr) {
- tcurr->next = tpnt;
- tpnt->prev = tcurr;
- } else {
- _dl_loaded_modules = tpnt;
- tpnt->prev = NULL;
+ 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;
+ 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));
_dl_memset(rpnt, 0, sizeof(struct dyn_elf));
}
rpnt->dyn = tpnt;
+ tpnt->rtld_flags = RTLD_NOW | RTLD_GLOBAL; /* Must not be LAZY */
+#ifdef RERELOCATE_LDSO
+ /* Only rerelocate functions for now. */
+ tpnt->init_flag = RELOCS_DONE;
+ lpnt = (unsigned long *) (tpnt->dynamic_info[DT_PLTGOT] + load_addr);
+# 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;
}
#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);
+ _dl_dprintf(1, "\t%s => %s (%x)\n",
+ rpnt->dyn->libname + _dl_strlen(_dl_ldsopath) + 1,
+ rpnt->dyn->libname, rpnt->dyn->loadaddr);
_dl_exit(0);
}
#endif
+#ifdef __SUPPORT_LD_DEBUG_EARLY__
+ _dl_dprintf(_dl_debug_file, "Beginning relocation fixups\n");
+#endif
#ifdef __mips__
/*
_dl_perform_mips_global_got_relocations(_dl_loaded_modules);
#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);
+ goof += _dl_fixup(_dl_symbol_tables, unlazy);
+ for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
+ if (tpnt->relro_size)
+ _dl_protect_relro (tpnt);
+ }
- /* 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. */
- _dl_brkp = (unsigned long *) (intptr_t) _dl_find_hash("___brk_addr", NULL, NULL, symbolrel);
-
- if (_dl_brkp) {
- *_dl_brkp = brk_addr;
- }
- _dl_envp = (unsigned long *) (intptr_t) _dl_find_hash("__environ", NULL, NULL, symbolrel);
- if (_dl_envp) {
+ /* 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.
+ */
+
+ _dl_envp = (unsigned long *) (intptr_t) _dl_find_hash("__environ", _dl_symbol_tables, NULL, 0);
+ 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 *) (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);
+
+ _dl_atexit = (int (*)(void *)) (intptr_t) _dl_find_hash("atexit", _dl_symbol_tables, NULL, ELF_RTYPE_CLASS_PLT);
#if defined (__SUPPORT_LD_DEBUG__)
- _dl_on_exit = (int (*)(void (*)(int, void *),void*))
- (intptr_t) _dl_find_hash("on_exit", NULL, NULL, symbolrel);
+ _dl_on_exit = (int (*)(void (*)(int, void *),void*))
+ (intptr_t) _dl_find_hash("on_exit", _dl_symbol_tables, NULL, ELF_RTYPE_CLASS_PLT);
#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 !! */
-
+ 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
+ if(_dl_debug)
+ _dl_dprintf(_dl_debug_file,
+ "\ncalling init: %s\n\n",
+ tpnt->libname);
+#endif
+
(*dl_elf_func) ();
}
+ tpnt->init_flag |= FINI_FUNCS_CALLED;
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)
- {
+ if(_dl_debug && _dl_on_exit) {
(*_dl_on_exit)(debug_fini, tpnt->libname);
}
#endif
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
}
#endif
}
/* Notify the debugger that all objects are now mapped in. */
_dl_debug_addr->r_state = RT_CONSISTENT;
_dl_debug_state();
-}
-/*
- * 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)
-{
+ /* 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);
}
char *_dl_getenv(const char *symbol, char **envp)
return;
}
-#include "hash.c"
-#include "readelflib1.c"
+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;
+}
+
+void *_dl_malloc(int size)
+{
+ void *retval;
+
+#if 0
+#ifdef __SUPPORT_LD_DEBUG_EARLY__
+ _dl_dprintf(2, "malloc: request for %d bytes\n", size);
+#endif
+#endif
+
+ if (_dl_malloc_function)
+ return (*_dl_malloc_function) (size);
+
+ if (_dl_malloc_addr - _dl_mmap_zero + (unsigned)size > _dl_pagesize) {
+#ifdef __SUPPORT_LD_DEBUG_EARLY__
+ _dl_dprintf(2, "malloc: mmapping more memory\n");
+#endif
+ _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(2, "%s: mmap of a spare page failed!\n", _dl_progname);
+ _dl_exit(20);
+ }
+ }
+ retval = _dl_malloc_addr;
+ _dl_malloc_addr += size;
+
+ /*
+ * 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;
+}
+
+#include "dl-hash.c"
+#include "dl-elf.c"
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