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1627 |
jcastillo |
/*
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* linux/fs/binfmt_elf.c
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*
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* These are the functions used to load ELF format executables as used
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* on SVr4 machines. Information on the format may be found in the book
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* "UNIX SYSTEM V RELEASE 4 Programmers Guide: Ansi C and Programming Support
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* Tools".
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*
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* Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/stat.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/a.out.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/binfmts.h>
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#include <linux/string.h>
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#include <linux/fcntl.h>
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#include <linux/ptrace.h>
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#include <linux/malloc.h>
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#include <linux/shm.h>
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#include <linux/personality.h>
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#include <linux/elfcore.h>
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#include <asm/segment.h>
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#include <asm/pgtable.h>
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#include <linux/config.h>
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#define DLINFO_ITEMS 12
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#include <linux/elf.h>
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#define JUMP_TO_MAIN 0
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#define STACK_SIZE (64*PAGE_SIZE)
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static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs);
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#define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_EXEC_PAGESIZE-1))
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#define ELF_PAGEOFFSET(_v) ((_v) & (ELF_EXEC_PAGESIZE-1))
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static struct linux_binfmt elf_format =
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{
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#ifndef MODULE
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NULL, NULL, load_elf_binary, NULL, NULL
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#else
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NULL, &mod_use_count_, load_elf_binary, load_elf_library, elf_core_dump
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#endif
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};
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struct sec_add {
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unsigned long pm_add;
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unsigned long vm_add;
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int len;
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} sec[ELF_SECTION_NB];
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unsigned short *or32_consth_add = (unsigned short *)NULL;
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unsigned long or32_consth_rel;
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#if JUMP_TO_MAIN
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unsigned long *create_elf_tables(char *p, int argc, int envc, struct pt_regs *regs)
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{
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unsigned long *argv, *envp;
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unsigned long *sp;
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/*
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* Force 16 byte alignment here for generality.
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*/
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sp = (unsigned long *) (~15UL & (unsigned long) p);
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sp -= 2;
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sp -= envc + 1;
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envp = sp;
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sp -= argc + 1;
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argv = sp;
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regs->gprs[1] = argc;
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put_user((unsigned long) argc, --sp);
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current->mm->arg_start = (unsigned long) p;
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regs->gprs[2] = (unsigned long) argv;
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while (argc-- > 0) {
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put_user(p, argv++);
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while (get_user(p++)) /* nothing */
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;
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}
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put_user(0, argv);
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current->mm->arg_end = current->mm->env_start = (unsigned long) p;
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regs->gprs[3] = (unsigned long) envp;
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while (envc-- > 0) {
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put_user(p, envp++);
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while (get_user(p++)) /* nothing */
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;
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}
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put_user(0, envp);
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current->mm->env_end = (unsigned long) p;
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return sp;
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}
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#else
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unsigned long *create_elf_tables(char *p, int argc, int envc, struct pt_regs *regs)
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{
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unsigned long *argv, *envp;
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unsigned long *sp;
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/*
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* Force 16 byte alignment here for generality.
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*/
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sp = (unsigned long *) (~15UL & (unsigned long) p);
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sp -= 2;
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sp -= envc + 1;
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envp = sp;
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sp -= argc + 1;
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argv = sp;
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regs->gprs[1] = sp;
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put_user((unsigned long) argc, --sp);
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current->mm->arg_start = (unsigned long) p;
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while (argc-- > 0) {
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put_user(p, argv++);
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while (get_user(p++)) /* nothing */
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;
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}
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put_user(0, argv);
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current->mm->arg_end = current->mm->env_start = (unsigned long) p;
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while (envc-- > 0) {
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put_user(p, envp++);
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while (get_user(p++)) /* nothing */
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;
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}
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put_user(0, envp);
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current->mm->env_end = (unsigned long) p;
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return sp;
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}
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#endif
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static unsigned long putstring(unsigned long p, char * string)
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{
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unsigned long l = strlen(string)+1;
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p -= l;
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memcpy((void*)p, string, l);
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return p;
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}
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static unsigned long putstringarray(unsigned long p, int count, char ** array)
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{
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while(count) {
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p=putstring(p, array[--count]);
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}
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return p;
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}
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static unsigned long stringarraylen(int count, char ** array)
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{
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int l = 4;
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while(count) {
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l += strlen(array[--count]);
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l++;
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l+=4;
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}
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return l;
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}
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int do_relocate(int dst_indx,
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int rel_nb,
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struct elf32_rel *rel_ptr,
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struct elf32_sym *sym_ptr,
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struct sec_add *sec)
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{
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struct elf32_sym *sym_tab;
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void *rel_loc;
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unsigned long tmp;
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int src_indx;
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int i;
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for(i = 0; i < rel_nb; i++, rel_ptr++) {
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/* Symbol tab */
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sym_tab = sym_ptr + (rel_ptr->r_info >> 8);
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/* Section index of section that contains symbol */
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src_indx = sym_tab->st_shndx;
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/* Location in physical memory to which this relocation
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is refering to */
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rel_loc = (void *)(rel_ptr->r_offset + sec[dst_indx].pm_add);
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if((rel_ptr->r_info & 0x000000ff) == R_OR32_32) {
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_print("R_OR32_32: rel_loc %.8lx vm_add = %.8lx pm_add = %.8lx val = %.8lx\n", rel_loc, sec[src_indx].vm_add, sec[src_indx].pm_add, sym_tab->st_value);
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*(unsigned long *)rel_loc = *(unsigned long *)rel_loc
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- sec[src_indx].vm_add
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+ sec[src_indx].pm_add
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+ sym_tab->st_value;
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}
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else if((rel_ptr->r_info & 0x000000ff) == R_OR32_16) {
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_print("R_OR32_16: rel_loc %.8lx vm_add = %.8lx pm_add = %.8lx\n", rel_loc, sec[src_indx].vm_add, sec[src_indx].pm_add);
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*(unsigned short *)rel_loc = *(unsigned short *)rel_loc
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- sec[src_indx].vm_add
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+ sec[src_indx].pm_add
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+ sym_tab->st_value;
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}
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| 202 |
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else if((rel_ptr->r_info & 0x000000ff) == R_OR32_8) {
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| 203 |
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_print("R_OR32_8: rel_loc %.8lx vm_add = %.8lx pm_add = %.8lx\n", rel_loc, sec[src_indx].vm_add, sec[src_indx].pm_add);
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*(unsigned char *)rel_loc = *(unsigned char *)rel_loc
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| 205 |
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- sec[src_indx].vm_add
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| 206 |
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+ sec[src_indx].pm_add
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| 207 |
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+ sym_tab->st_value;
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| 208 |
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}
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| 209 |
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else if((rel_ptr->r_info & 0x000000ff) == R_OR32_CONSTH) {
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| 210 |
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_print("R_OR32_CONSTH: rel_loc %.8lx *rel_loc %.8lx\n", rel_loc, *(((unsigned short *)rel_loc) + 1));
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| 211 |
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_print(" vm_add %.8lx pm_add %.8lx\n", sec[src_indx].vm_add, sec[src_indx].pm_add);
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| 212 |
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or32_consth_add = (((unsigned short *)rel_loc) + 1);
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| 213 |
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or32_consth_rel = *or32_consth_add << 16;
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| 214 |
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}
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| 215 |
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else if((rel_ptr->r_info & 0x000000ff) == R_OR32_CONST) {
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| 216 |
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_print("R_OR32_CONST: rel_loc %.8lx *rel_loc %.8lx\n", rel_loc, *(((unsigned short *)rel_loc) + 1));
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| 217 |
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_print(" vm_add %.8lx pm_add %.8lx\n", sec[src_indx].vm_add, sec[src_indx].pm_add);
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| 218 |
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_print(" consth %.8lx st_value %.8lx\n", or32_consth_rel, sym_tab->st_value);
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| 219 |
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| 220 |
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tmp = or32_consth_rel | *(((unsigned short *)rel_loc) + 1);
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| 221 |
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tmp = tmp + sym_tab->st_value - sec[src_indx].vm_add +
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| 222 |
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sec[src_indx].pm_add;
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| 223 |
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*(((unsigned short *)rel_loc) + 1) = tmp & 0x0000ffff;
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| 224 |
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if(or32_consth_add != (unsigned short *)NULL) {
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| 225 |
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*or32_consth_add = tmp >> 16;
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| 226 |
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or32_consth_add = (unsigned short *)NULL;
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| 227 |
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or32_consth_rel = 0;
|
| 228 |
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}
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| 229 |
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}
|
| 230 |
|
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else if((rel_ptr->r_info & 0x000000ff) == R_OR32_JUMPTARG) {
|
| 231 |
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_print("R_OR32_JUMPTARG: rel_loc %.8lx vm_add = %.8lx pm_add = %.8lx\n", rel_loc, sec[src_indx].vm_add, sec[src_indx].pm_add);
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| 232 |
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_print(" pm_add %.8lx\n", sec[dst_indx].pm_add);
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| 233 |
|
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tmp = ((*(unsigned long *)rel_loc) & 0x03ffffff);
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| 234 |
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tmp = (tmp & 0x02000000) ? (tmp | 0xfc000000) : tmp;
|
| 235 |
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tmp = tmp + ((sym_tab->st_value -
|
| 236 |
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sec[src_indx].vm_add +
|
| 237 |
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sec[src_indx].pm_add -
|
| 238 |
|
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sec[dst_indx].pm_add) >> 2);
|
| 239 |
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*(unsigned long *)rel_loc =
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| 240 |
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((*(unsigned long *)rel_loc) & 0xfc000000) |
|
| 241 |
|
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(tmp & 0x03ffffff);
|
| 242 |
|
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}
|
| 243 |
|
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else {
|
| 244 |
|
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return -ELNRNG;
|
| 245 |
|
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}
|
| 246 |
|
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}
|
| 247 |
|
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return 0;
|
| 248 |
|
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}
|
| 249 |
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|
| 250 |
|
|
#if JUMP_TO_MAIN
|
| 251 |
|
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unsigned long do_find_main(int sym_nb, struct elf32_sym *sym_prt, char *str_ptr)
|
| 252 |
|
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{
|
| 253 |
|
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int i;
|
| 254 |
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|
|
| 255 |
|
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for(i = 0; i < sym_nb; i++, sym_prt++) {
|
| 256 |
|
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if(sym_prt->st_name == 0)
|
| 257 |
|
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continue;
|
| 258 |
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|
|
| 259 |
|
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if(strcmp(&str_ptr[sym_prt->st_name], "_main") == 0)
|
| 260 |
|
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return (sym_prt->st_value + sec[sym_prt->st_shndx].pm_add);
|
| 261 |
|
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}
|
| 262 |
|
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return 0;
|
| 263 |
|
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}
|
| 264 |
|
|
#else
|
| 265 |
|
|
unsigned long do_find_start(int sym_nb, struct elf32_sym *sym_prt, char *str_ptr)
|
| 266 |
|
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{
|
| 267 |
|
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int i;
|
| 268 |
|
|
|
| 269 |
|
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for(i = 0; i < sym_nb; i++, sym_prt++) {
|
| 270 |
|
|
if(sym_prt->st_name == 0)
|
| 271 |
|
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continue;
|
| 272 |
|
|
|
| 273 |
|
|
if(strcmp(&str_ptr[sym_prt->st_name], "_start") == 0)
|
| 274 |
|
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return (sym_prt->st_value + sec[sym_prt->st_shndx].pm_add);
|
| 275 |
|
|
}
|
| 276 |
|
|
return 0;
|
| 277 |
|
|
}
|
| 278 |
|
|
#endif
|
| 279 |
|
|
/*
|
| 280 |
|
|
* These are the functions used to load ELF style executables and shared
|
| 281 |
|
|
* libraries. There is no binary dependent code anywhere else.
|
| 282 |
|
|
*/
|
| 283 |
|
|
|
| 284 |
|
|
#define INTERPRETER_NONE 0
|
| 285 |
|
|
#define INTERPRETER_AOUT 1
|
| 286 |
|
|
#define INTERPRETER_ELF 2
|
| 287 |
|
|
|
| 288 |
|
|
|
| 289 |
|
|
static inline int do_load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
|
| 290 |
|
|
{
|
| 291 |
|
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struct elfhdr elf_ex;
|
| 292 |
|
|
struct file *file;
|
| 293 |
|
|
int i,j;
|
| 294 |
|
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int old_fs;
|
| 295 |
|
|
struct elf32_shdr *elf_spnt, *elf_shdata;
|
| 296 |
|
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int elf_exec_fileno;
|
| 297 |
|
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unsigned long elf_entry = 0;
|
| 298 |
|
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unsigned long code_start, code_end, code_len = 0;
|
| 299 |
|
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unsigned long data_start, data_end, data_len = 0;
|
| 300 |
|
|
unsigned long bss_start, bss_end, bss_len = 0;
|
| 301 |
|
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unsigned long stack_len = 0;
|
| 302 |
|
|
int rel_indx, symtab_indx = 0, strtab_indx = 0;
|
| 303 |
|
|
struct elf32_rel *rel_ptr;
|
| 304 |
|
|
struct elf32_sym *sym_ptr = (struct elf32_sym *)0;
|
| 305 |
|
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char *str_ptr = (char *)0;
|
| 306 |
|
|
int retval;
|
| 307 |
|
|
|
| 308 |
|
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or32_consth_add = 0;
|
| 309 |
|
|
or32_consth_rel = 0;
|
| 310 |
|
|
|
| 311 |
|
|
current->personality = PER_LINUX;
|
| 312 |
|
|
|
| 313 |
|
|
elf_exec_fileno = open_inode(bprm->inode, O_RDONLY);
|
| 314 |
|
|
|
| 315 |
|
|
if (elf_exec_fileno < 0)
|
| 316 |
|
|
return elf_exec_fileno;
|
| 317 |
|
|
|
| 318 |
|
|
file = current->files->fd[elf_exec_fileno];
|
| 319 |
|
|
|
| 320 |
|
|
|
| 321 |
|
|
elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */
|
| 322 |
|
|
|
| 323 |
|
|
/* First of all, some simple consistency checks */
|
| 324 |
|
|
if (elf_ex.e_type != ET_REL ||
|
| 325 |
|
|
|
| 326 |
|
|
!bprm->inode->i_op ||
|
| 327 |
|
|
!bprm->inode->i_op->default_file_ops ||
|
| 328 |
|
|
!bprm->inode->i_op->default_file_ops->mmap ||
|
| 329 |
|
|
elf_ex.e_ident[0] != 0x7f ||
|
| 330 |
|
|
strncmp(&elf_ex.e_ident[1], "ELF", 3) != 0) {
|
| 331 |
|
|
return -ENOEXEC;
|
| 332 |
|
|
}
|
| 333 |
|
|
|
| 334 |
|
|
if (flush_old_exec(bprm)) {
|
| 335 |
|
|
return -ENOMEM;
|
| 336 |
|
|
}
|
| 337 |
|
|
|
| 338 |
|
|
if(elf_ex.e_shnum > ELF_SECTION_NB)
|
| 339 |
|
|
return -ETOOMANYSECT;
|
| 340 |
|
|
|
| 341 |
|
|
for(i = 0; i < ELF_SECTION_NB; i++)
|
| 342 |
|
|
sec[i].len = 0;
|
| 343 |
|
|
|
| 344 |
|
|
/* Now read in all of the header information */
|
| 345 |
|
|
elf_shdata = (struct elf32_shdr *) kmalloc(elf_ex.e_shnum *
|
| 346 |
|
|
elf_ex.e_shentsize, GFP_KERNEL);
|
| 347 |
|
|
|
| 348 |
|
|
if (elf_shdata == NULL)
|
| 349 |
|
|
return -ENOMEM;
|
| 350 |
|
|
|
| 351 |
|
|
retval = read_exec(bprm->inode, elf_ex.e_shoff, (char *) elf_shdata,
|
| 352 |
|
|
elf_ex.e_shentsize * elf_ex.e_shnum, 1);
|
| 353 |
|
|
|
| 354 |
|
|
if (retval < 0) {
|
| 355 |
|
|
kfree(elf_shdata);
|
| 356 |
|
|
return retval;
|
| 357 |
|
|
}
|
| 358 |
|
|
|
| 359 |
|
|
/* OK, This is the point of no return */
|
| 360 |
|
|
|
| 361 |
|
|
current->mm->end_data = 0;
|
| 362 |
|
|
current->mm->end_code = 0;
|
| 363 |
|
|
|
| 364 |
|
|
/* Now we do a little grungy work by mmaping the ELF image into
|
| 365 |
|
|
the memory. At this point, we assume that at a variable
|
| 366 |
|
|
address. */
|
| 367 |
|
|
|
| 368 |
|
|
old_fs = get_fs();
|
| 369 |
|
|
set_fs(get_ds());
|
| 370 |
|
|
|
| 371 |
|
|
/* Calculate the total size of memory needed */
|
| 372 |
|
|
for(i = 0, elf_spnt = elf_shdata; i < elf_ex.e_shnum; i++, elf_spnt++) {
|
| 373 |
|
|
if(elf_spnt->sh_type == SHT_PROGBITS) {
|
| 374 |
|
|
if(elf_spnt->sh_flags & SHF_EXECINSTR)
|
| 375 |
|
|
code_len += (elf_spnt->sh_size + 3) & ~(3);
|
| 376 |
|
|
else if(elf_spnt->sh_flags & SHF_ALLOC)
|
| 377 |
|
|
data_len += (elf_spnt->sh_size + 3) & ~(3);
|
| 378 |
|
|
}
|
| 379 |
|
|
else if(elf_spnt->sh_type == SHT_NOBITS) {
|
| 380 |
|
|
if(elf_spnt->sh_flags & SHF_ALLOC)
|
| 381 |
|
|
bss_len += (elf_spnt->sh_size + 3) & ~(3);
|
| 382 |
|
|
}
|
| 383 |
|
|
}
|
| 384 |
|
|
|
| 385 |
|
|
/* Make room on stack for arguments & environment */
|
| 386 |
|
|
stack_len = STACK_SIZE;
|
| 387 |
|
|
stack_len += strlen(bprm->filename) + 1;
|
| 388 |
|
|
stack_len += stringarraylen(bprm->envc, bprm->envp);
|
| 389 |
|
|
stack_len += stringarraylen(bprm->argc, bprm->argv);
|
| 390 |
|
|
|
| 391 |
|
|
/* Allocate space */
|
| 392 |
|
|
retval = (unsigned long)do_mmap(NULL,
|
| 393 |
|
|
0,
|
| 394 |
|
|
code_len + code_len + bss_len + stack_len,
|
| 395 |
|
|
PROT_EXEC | PROT_WRITE | PROT_READ,
|
| 396 |
|
|
0,
|
| 397 |
|
|
0);
|
| 398 |
|
|
|
| 399 |
|
|
if(retval > (unsigned long)-4096) {
|
| 400 |
|
|
kfree(elf_shdata);
|
| 401 |
|
|
return retval;
|
| 402 |
|
|
}
|
| 403 |
|
|
|
| 404 |
|
|
code_start = retval;
|
| 405 |
|
|
code_end = code_start;
|
| 406 |
|
|
data_start = code_start + code_len;
|
| 407 |
|
|
data_end = data_start;
|
| 408 |
|
|
bss_start = data_start + data_len;
|
| 409 |
|
|
bss_end = bss_start;
|
| 410 |
|
|
|
| 411 |
|
|
current->mm->executable = 0;
|
| 412 |
|
|
|
| 413 |
|
|
/* Now copy sections in memory */
|
| 414 |
|
|
|
| 415 |
|
|
for(i = 0, elf_spnt = elf_shdata; i < elf_ex.e_shnum; i++, elf_spnt++) {
|
| 416 |
|
|
|
| 417 |
|
|
if(elf_spnt->sh_type == SHT_PROGBITS && elf_spnt->sh_flags & SHF_EXECINSTR) {
|
| 418 |
|
|
|
| 419 |
|
|
if(elf_spnt->sh_size == 0)
|
| 420 |
|
|
continue;
|
| 421 |
|
|
|
| 422 |
|
|
retval = read_exec(bprm->inode, elf_spnt->sh_offset,
|
| 423 |
|
|
(char *)code_end, elf_spnt->sh_size, 1);
|
| 424 |
|
|
|
| 425 |
|
|
if (retval < 0) {
|
| 426 |
|
|
do_munmap(code_start, code_len + code_len + bss_len + stack_len);
|
| 427 |
|
|
kfree(elf_shdata);
|
| 428 |
|
|
return retval;
|
| 429 |
|
|
}
|
| 430 |
|
|
|
| 431 |
|
|
sec[i].pm_add = code_end;
|
| 432 |
|
|
sec[i].vm_add = elf_spnt->sh_addr;
|
| 433 |
|
|
|
| 434 |
|
|
code_end = code_end + ((elf_spnt->sh_size + 3) & ~(3));
|
| 435 |
|
|
}
|
| 436 |
|
|
else if (elf_spnt->sh_type == SHT_PROGBITS && elf_spnt->sh_flags & SHF_ALLOC) {
|
| 437 |
|
|
|
| 438 |
|
|
if(elf_spnt->sh_size == 0)
|
| 439 |
|
|
continue;
|
| 440 |
|
|
|
| 441 |
|
|
retval = read_exec(bprm->inode, elf_spnt->sh_offset,
|
| 442 |
|
|
(char *)data_end, elf_spnt->sh_size, 1);
|
| 443 |
|
|
|
| 444 |
|
|
if (retval < 0) {
|
| 445 |
|
|
do_munmap(code_start, code_len + code_len + bss_len + stack_len);
|
| 446 |
|
|
kfree(elf_shdata);
|
| 447 |
|
|
return retval;
|
| 448 |
|
|
}
|
| 449 |
|
|
|
| 450 |
|
|
sec[i].pm_add = data_end;
|
| 451 |
|
|
sec[i].vm_add = elf_spnt->sh_addr;
|
| 452 |
|
|
|
| 453 |
|
|
data_end = data_end + ((elf_spnt->sh_size + 3) & ~(3));
|
| 454 |
|
|
}
|
| 455 |
|
|
else if (elf_spnt->sh_type == SHT_NOBITS && elf_spnt->sh_flags & SHF_ALLOC) {
|
| 456 |
|
|
|
| 457 |
|
|
if(elf_spnt->sh_size == 0)
|
| 458 |
|
|
continue;
|
| 459 |
|
|
|
| 460 |
|
|
sec[i].pm_add = bss_end;
|
| 461 |
|
|
sec[i].vm_add = elf_spnt->sh_addr;
|
| 462 |
|
|
|
| 463 |
|
|
bss_end = bss_end + ((elf_spnt->sh_size + 3) & ~(3));
|
| 464 |
|
|
}
|
| 465 |
|
|
}
|
| 466 |
|
|
|
| 467 |
|
|
/* Set bss and stack to zero */
|
| 468 |
|
|
memset((void*)(bss_start), 0, bss_len + stack_len);
|
| 469 |
|
|
|
| 470 |
|
|
for(i = 0, elf_spnt = elf_shdata; i < elf_ex.e_shnum; elf_spnt++, i++) {
|
| 471 |
|
|
if(elf_spnt->sh_type == SHT_SYMTAB && (elf_spnt->sh_size != 0)) {
|
| 472 |
|
|
struct elf32_shdr *link_shdr;
|
| 473 |
|
|
int sym_nb;
|
| 474 |
|
|
unsigned long retval;
|
| 475 |
|
|
|
| 476 |
|
|
/* Map symtab section */
|
| 477 |
|
|
retval = (unsigned long)do_mmap(NULL,
|
| 478 |
|
|
0,
|
| 479 |
|
|
elf_spnt->sh_size,
|
| 480 |
|
|
PROT_READ,
|
| 481 |
|
|
0,
|
| 482 |
|
|
0);
|
| 483 |
|
|
if(retval > (unsigned long)-4096) {
|
| 484 |
|
|
for(j = 0; j < elf_ex.e_shnum; j++)
|
| 485 |
|
|
if(sec[j].len)
|
| 486 |
|
|
do_munmap(sec[j].pm_add, sec[j].len);
|
| 487 |
|
|
do_munmap(code_start, code_len + code_len + bss_len + stack_len);
|
| 488 |
|
|
kfree(elf_shdata);
|
| 489 |
|
|
return retval;
|
| 490 |
|
|
}
|
| 491 |
|
|
|
| 492 |
|
|
symtab_indx = i;
|
| 493 |
|
|
sec[symtab_indx].pm_add = retval;
|
| 494 |
|
|
sym_ptr = (struct elf32_sym *)retval;
|
| 495 |
|
|
sec[symtab_indx].len = elf_spnt->sh_size;
|
| 496 |
|
|
|
| 497 |
|
|
retval = read_exec(bprm->inode, elf_spnt->sh_offset,
|
| 498 |
|
|
(char *)retval, elf_spnt->sh_size, 1);
|
| 499 |
|
|
if (retval < 0) {
|
| 500 |
|
|
for(j = 0; j < elf_ex.e_shnum; j++)
|
| 501 |
|
|
if(sec[j].len)
|
| 502 |
|
|
do_munmap(sec[j].pm_add, sec[j].len);
|
| 503 |
|
|
do_munmap(code_start, code_len + code_len + bss_len + stack_len);
|
| 504 |
|
|
kfree(elf_shdata);
|
| 505 |
|
|
return retval;
|
| 506 |
|
|
}
|
| 507 |
|
|
|
| 508 |
|
|
strtab_indx = elf_spnt->sh_link;
|
| 509 |
|
|
link_shdr = elf_shdata + strtab_indx;
|
| 510 |
|
|
|
| 511 |
|
|
/* Map strtab section */
|
| 512 |
|
|
retval = (unsigned long)do_mmap(NULL,
|
| 513 |
|
|
0,
|
| 514 |
|
|
link_shdr->sh_size,
|
| 515 |
|
|
PROT_READ,
|
| 516 |
|
|
0,
|
| 517 |
|
|
0);
|
| 518 |
|
|
if(retval > (unsigned long)-4096) {
|
| 519 |
|
|
for(j = 0; j < elf_ex.e_shnum; j++)
|
| 520 |
|
|
if(sec[j].len)
|
| 521 |
|
|
do_munmap(sec[j].pm_add, sec[j].len);
|
| 522 |
|
|
do_munmap(code_start, code_len + code_len + bss_len + stack_len);
|
| 523 |
|
|
kfree(elf_shdata);
|
| 524 |
|
|
return retval;
|
| 525 |
|
|
}
|
| 526 |
|
|
|
| 527 |
|
|
sec[strtab_indx].pm_add = retval;
|
| 528 |
|
|
str_ptr = (char *)retval;
|
| 529 |
|
|
sec[strtab_indx].len = link_shdr->sh_size;
|
| 530 |
|
|
|
| 531 |
|
|
retval = read_exec(bprm->inode, link_shdr->sh_offset,
|
| 532 |
|
|
(char *)retval, link_shdr->sh_size, 1);
|
| 533 |
|
|
if (retval < 0) {
|
| 534 |
|
|
for(j = 0; j < elf_ex.e_shnum; j++)
|
| 535 |
|
|
if(sec[j].len)
|
| 536 |
|
|
do_munmap(sec[j].pm_add, sec[j].len);
|
| 537 |
|
|
do_munmap(code_start, code_len + code_len + bss_len + stack_len);
|
| 538 |
|
|
kfree(elf_shdata);
|
| 539 |
|
|
return retval;
|
| 540 |
|
|
}
|
| 541 |
|
|
|
| 542 |
|
|
sym_nb = sec[symtab_indx].len / sizeof(struct elf32_sym);
|
| 543 |
|
|
#if JUMP_TO_MAIN
|
| 544 |
|
|
elf_entry = do_find_main(sym_nb, sym_ptr, str_ptr);
|
| 545 |
|
|
#else
|
| 546 |
|
|
elf_entry = do_find_start(sym_nb, sym_ptr, str_ptr);
|
| 547 |
|
|
#endif
|
| 548 |
|
|
break;
|
| 549 |
|
|
}
|
| 550 |
|
|
}
|
| 551 |
|
|
|
| 552 |
|
|
for(i = 0, elf_spnt = elf_shdata; i < elf_ex.e_shnum; elf_spnt++, i++) {
|
| 553 |
|
|
if(elf_spnt->sh_type == SHT_REL && (elf_spnt->sh_size != 0)) {
|
| 554 |
|
|
struct elf32_shdr *link_shdr;
|
| 555 |
|
|
int rel_nb;
|
| 556 |
|
|
unsigned long retval;
|
| 557 |
|
|
|
| 558 |
|
|
/* Map rel section */
|
| 559 |
|
|
retval = (unsigned long)do_mmap(NULL,
|
| 560 |
|
|
0,
|
| 561 |
|
|
elf_spnt->sh_size,
|
| 562 |
|
|
PROT_READ,
|
| 563 |
|
|
0,
|
| 564 |
|
|
0);
|
| 565 |
|
|
if(retval > (unsigned long)-4096) {
|
| 566 |
|
|
for(j = 0; j < elf_ex.e_shnum; j++)
|
| 567 |
|
|
if(sec[j].len)
|
| 568 |
|
|
do_munmap(sec[j].pm_add, sec[j].len);
|
| 569 |
|
|
do_munmap(code_start, code_len + code_len + bss_len + stack_len);
|
| 570 |
|
|
kfree(elf_shdata);
|
| 571 |
|
|
return retval;
|
| 572 |
|
|
}
|
| 573 |
|
|
|
| 574 |
|
|
sec[i].pm_add = retval;
|
| 575 |
|
|
rel_ptr = (struct elf32_rel *)retval;
|
| 576 |
|
|
sec[i].len = elf_spnt->sh_size;
|
| 577 |
|
|
|
| 578 |
|
|
retval = read_exec(bprm->inode, elf_spnt->sh_offset,
|
| 579 |
|
|
(char *)retval, elf_spnt->sh_size, 1);
|
| 580 |
|
|
if (retval < 0) {
|
| 581 |
|
|
for(j = 0; j < elf_ex.e_shnum; j++)
|
| 582 |
|
|
if(sec[j].len)
|
| 583 |
|
|
do_munmap(sec[j].pm_add, sec[j].len);
|
| 584 |
|
|
do_munmap(code_start, code_len + code_len + bss_len + stack_len);
|
| 585 |
|
|
kfree(elf_shdata);
|
| 586 |
|
|
return retval;
|
| 587 |
|
|
}
|
| 588 |
|
|
|
| 589 |
|
|
rel_indx = i;
|
| 590 |
|
|
link_shdr = elf_shdata + symtab_indx;
|
| 591 |
|
|
|
| 592 |
|
|
/* Now do relocations for the n-th section. n is read from
|
| 593 |
|
|
real setiona hader info field. */
|
| 594 |
|
|
|
| 595 |
|
|
rel_nb = sec[rel_indx].len / sizeof(struct elf32_rel);
|
| 596 |
|
|
retval = do_relocate(elf_spnt->sh_info, rel_nb, rel_ptr, sym_ptr, sec);
|
| 597 |
|
|
|
| 598 |
|
|
if (retval < 0) {
|
| 599 |
|
|
for(j = 0; j < elf_ex.e_shnum; j++)
|
| 600 |
|
|
if(sec[j].len)
|
| 601 |
|
|
do_munmap(sec[j].pm_add, sec[j].len);
|
| 602 |
|
|
do_munmap(code_start, code_len + code_len + bss_len + stack_len);
|
| 603 |
|
|
kfree(elf_shdata);
|
| 604 |
|
|
return retval;
|
| 605 |
|
|
}
|
| 606 |
|
|
|
| 607 |
|
|
/* Now unmap rel section */
|
| 608 |
|
|
do_munmap(sec[rel_indx].pm_add, sec[rel_indx].len);
|
| 609 |
|
|
sec[rel_indx].len = 0;
|
| 610 |
|
|
}
|
| 611 |
|
|
}
|
| 612 |
|
|
|
| 613 |
|
|
/* Now unmap sym and str sections */
|
| 614 |
|
|
do_munmap(sec[symtab_indx].pm_add, sec[symtab_indx].len);
|
| 615 |
|
|
sec[symtab_indx].len = 0;
|
| 616 |
|
|
do_munmap(sec[strtab_indx].pm_add, sec[strtab_indx].len);
|
| 617 |
|
|
sec[strtab_indx].len = 0;
|
| 618 |
|
|
|
| 619 |
|
|
set_fs(old_fs);
|
| 620 |
|
|
kfree(elf_shdata);
|
| 621 |
|
|
|
| 622 |
|
|
if (current->exec_domain && current->exec_domain->use_count)
|
| 623 |
|
|
(*current->exec_domain->use_count)--;
|
| 624 |
|
|
if (current->binfmt && current->binfmt->use_count)
|
| 625 |
|
|
(*current->binfmt->use_count)--;
|
| 626 |
|
|
current->exec_domain = lookup_exec_domain(current->personality);
|
| 627 |
|
|
current->binfmt = &elf_format;
|
| 628 |
|
|
if (current->exec_domain && current->exec_domain->use_count)
|
| 629 |
|
|
(*current->exec_domain->use_count)++;
|
| 630 |
|
|
if (current->binfmt && current->binfmt->use_count)
|
| 631 |
|
|
(*current->binfmt->use_count)++;
|
| 632 |
|
|
|
| 633 |
|
|
bprm->p = bss_end + stack_len - 4;
|
| 634 |
|
|
|
| 635 |
|
|
bprm->p = putstringarray(bprm->p, 1, &bprm->filename);
|
| 636 |
|
|
|
| 637 |
|
|
bprm->p = putstringarray(bprm->p, bprm->envc, bprm->envp);
|
| 638 |
|
|
|
| 639 |
|
|
bprm->p = putstringarray(bprm->p, bprm->argc, bprm->argv);
|
| 640 |
|
|
|
| 641 |
|
|
current->suid = current->euid = current->fsuid = bprm->e_uid;
|
| 642 |
|
|
current->sgid = current->egid = current->fsgid = bprm->e_gid;
|
| 643 |
|
|
current->flags &= ~PF_FORKNOEXEC;
|
| 644 |
|
|
bprm->p = (unsigned long)create_elf_tables((char *) bprm->p, bprm->argc, bprm->envc, regs);
|
| 645 |
|
|
|
| 646 |
|
|
current->mm->brk = bss_end;
|
| 647 |
|
|
current->mm->start_code = code_start;
|
| 648 |
|
|
current->mm->end_code = code_end;
|
| 649 |
|
|
current->mm->start_data = data_start;
|
| 650 |
|
|
current->mm->end_data = data_end;
|
| 651 |
|
|
current->mm->start_stack = bprm->p;
|
| 652 |
|
|
|
| 653 |
|
|
_print("%s - %s:%d\n",__FILE__,__FUNCTION__,__LINE__);
|
| 654 |
|
|
_print(" start_code = %x\n", current->mm->start_code);
|
| 655 |
|
|
_print(" end_code = %x\n", current->mm->end_code);
|
| 656 |
|
|
_print(" start_data = %x\n", current->mm->start_data);
|
| 657 |
|
|
_print(" end_data = %x\n", current->mm->end_data);
|
| 658 |
|
|
_print(" start_brk = %x\n", current->mm->start_brk);
|
| 659 |
|
|
_print(" brk = %x\n", current->mm->brk);
|
| 660 |
|
|
_print(" start_stack = %x\n", current->mm->start_stack);
|
| 661 |
|
|
_print(" arg_start = %x\n", current->mm->arg_start);
|
| 662 |
|
|
_print(" env_start = %x\n", current->mm->env_start);
|
| 663 |
|
|
_print(" env_end = %x\n", current->mm->env_end);
|
| 664 |
|
|
_print(" elf_entry = %x\n", elf_entry);
|
| 665 |
|
|
|
| 666 |
|
|
start_thread(regs, elf_entry, bprm->p);
|
| 667 |
|
|
|
| 668 |
|
|
if (current->flags & PF_PTRACED)
|
| 669 |
|
|
send_sig(SIGTRAP, current, 0);
|
| 670 |
|
|
|
| 671 |
|
|
return 0;
|
| 672 |
|
|
}
|
| 673 |
|
|
|
| 674 |
|
|
static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
|
| 675 |
|
|
{
|
| 676 |
|
|
int retval;
|
| 677 |
|
|
|
| 678 |
|
|
MOD_INC_USE_COUNT;
|
| 679 |
|
|
retval = do_load_elf_binary(bprm, regs);
|
| 680 |
|
|
MOD_DEC_USE_COUNT;
|
| 681 |
|
|
return retval;
|
| 682 |
|
|
}
|
| 683 |
|
|
|
| 684 |
|
|
int init_elf_binfmt(void)
|
| 685 |
|
|
{
|
| 686 |
|
|
return register_binfmt(&elf_format);
|
| 687 |
|
|
}
|
| 688 |
|
|
|
| 689 |
|
|
#ifdef MODULE
|
| 690 |
|
|
|
| 691 |
|
|
int init_module(void)
|
| 692 |
|
|
{
|
| 693 |
|
|
/* Install the COFF, ELF and XOUT loaders.
|
| 694 |
|
|
* N.B. We *rely* on the table being the right size with the
|
| 695 |
|
|
* right number of free slots...
|
| 696 |
|
|
*/
|
| 697 |
|
|
return init_elf_binfmt();
|
| 698 |
|
|
}
|
| 699 |
|
|
|
| 700 |
|
|
|
| 701 |
|
|
void cleanup_module(void)
|
| 702 |
|
|
{
|
| 703 |
|
|
/* Remove the COFF and ELF loaders. */
|
| 704 |
|
|
unregister_binfmt(&elf_format);
|
| 705 |
|
|
}
|
| 706 |
|
|
|
| 707 |
|
|
#endif
|
