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-rw-r--r--jail/elf.c355
1 files changed, 0 insertions, 355 deletions
diff --git a/jail/elf.c b/jail/elf.c
deleted file mode 100644
index cbb3051..0000000
--- a/jail/elf.c
+++ /dev/null
@@ -1,355 +0,0 @@
-/*
- * Copyright (C) 2015 John Crispin <blogic@openwrt.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1
- * as published by the Free Software Foundation
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
-#define _GNU_SOURCE
-#include <sys/mman.h>
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <libgen.h>
-#include <glob.h>
-#include <elf.h>
-
-#include <libubox/utils.h>
-
-#include "elf.h"
-
-struct avl_tree libraries;
-static LIST_HEAD(library_paths);
-
-void alloc_library_path(const char *path)
-{
- struct library_path *p;
- char *_path;
-
- p = calloc_a(sizeof(*p),
- &_path, strlen(path) + 1);
- if (!p)
- return;
-
- p->path = strcpy(_path, path);
-
- list_add_tail(&p->list, &library_paths);
- DEBUG("adding ld.so path %s\n", path);
-}
-
-static void alloc_library(const char *path, const char *name)
-{
- struct library *l;
- char *_name, *_path;
-
- l = calloc_a(sizeof(*l),
- &_path, strlen(path) + 1,
- &_name, strlen(name) + 1);
- if (!l)
- return;
-
- l->avl.key = l->name = strcpy(_name, name);
- l->path = strcpy(_path, path);
-
- avl_insert(&libraries, &l->avl);
- DEBUG("adding library %s/%s\n", path, name);
-}
-
-static int elf_open(char **dir, char *file)
-{
- struct library_path *p;
- char path[256];
- int fd = -1;
-
- *dir = NULL;
-
- list_for_each_entry(p, &library_paths, list) {
- if (strlen(p->path))
- snprintf(path, sizeof(path), "%s/%s", p->path, file);
- else
- strncpy(path, file, sizeof(path));
- fd = open(path, O_RDONLY);
- if (fd >= 0) {
- *dir = p->path;
- break;
- }
- }
-
- if (fd == -1)
- fd = open(file, O_RDONLY);
-
- return fd;
-}
-
-char* find_lib(char *file)
-{
- struct library *l;
- static char path[256];
- const char *p;
-
- l = avl_find_element(&libraries, file, l, avl);
- if (!l)
- return NULL;
-
- p = l->path;
- if (strstr(p, "local"))
- p = "/lib";
-
- snprintf(path, sizeof(path), "%s/%s", p, file);
-
- return path;
-}
-
-static int elf64_find_section(char *map, unsigned int type, unsigned int *offset, unsigned int *size, unsigned int *vaddr)
-{
- Elf64_Ehdr *e;
- Elf64_Phdr *ph;
- int i;
-
- e = (Elf64_Ehdr *) map;
- ph = (Elf64_Phdr *) (map + e->e_phoff);
-
- for (i = 0; i < e->e_phnum; i++) {
- if (ph[i].p_type == type) {
- *offset = ph[i].p_offset;
- if (size)
- *size = ph[i].p_filesz;
- if (vaddr)
- *vaddr = ph[i].p_vaddr;
- return 0;
- }
- }
-
- return -1;
-}
-
-static int elf32_find_section(char *map, unsigned int type, unsigned int *offset, unsigned int *size, unsigned int *vaddr)
-{
- Elf32_Ehdr *e;
- Elf32_Phdr *ph;
- int i;
-
- e = (Elf32_Ehdr *) map;
- ph = (Elf32_Phdr *) (map + e->e_phoff);
-
- for (i = 0; i < e->e_phnum; i++) {
- if (ph[i].p_type == type) {
- *offset = ph[i].p_offset;
- if (size)
- *size = ph[i].p_filesz;
- if (vaddr)
- *vaddr = ph[i].p_vaddr;
- return 0;
- }
- }
-
- return -1;
-}
-
-static int elf_find_section(char *map, unsigned int type, unsigned int *offset, unsigned int *size, unsigned int *vaddr)
-{
- int clazz = map[EI_CLASS];
-
- if (clazz == ELFCLASS32)
- return elf32_find_section(map, type, offset, size, vaddr);
- else if (clazz == ELFCLASS64)
- return elf64_find_section(map, type, offset, size, vaddr);
-
- ERROR("unknown elf format %d\n", clazz);
-
- return -1;
-}
-
-static int elf32_scan_dynamic(char *map, int dyn_offset, int dyn_size, int load_offset)
-{
- Elf32_Dyn *dynamic = (Elf32_Dyn *) (map + dyn_offset);
- char *strtab = NULL;
-
- while ((void *) dynamic < (void *) (map + dyn_offset + dyn_size)) {
- Elf32_Dyn *curr = dynamic;
-
- dynamic++;
- if (curr->d_tag != DT_STRTAB)
- continue;
-
- strtab = map + (curr->d_un.d_val - load_offset);
- break;
- }
-
- if (!strtab)
- return -1;
-
- dynamic = (Elf32_Dyn *) (map + dyn_offset);
- while ((void *) dynamic < (void *) (map + dyn_offset + dyn_size)) {
- Elf32_Dyn *curr = dynamic;
-
- dynamic++;
- if (curr->d_tag != DT_NEEDED)
- continue;
-
- if (elf_load_deps(&strtab[curr->d_un.d_val]))
- return -1;
- }
-
- return 0;
-}
-
-static int elf64_scan_dynamic(char *map, int dyn_offset, int dyn_size, int load_offset)
-{
- Elf64_Dyn *dynamic = (Elf64_Dyn *) (map + dyn_offset);
- char *strtab = NULL;
-
- while ((void *) dynamic < (void *) (map + dyn_offset + dyn_size)) {
- Elf64_Dyn *curr = dynamic;
-
- dynamic++;
- if (curr->d_tag != DT_STRTAB)
- continue;
-
- strtab = map + (curr->d_un.d_val - load_offset);
- break;
- }
-
- if (!strtab)
- return -1;
-
- dynamic = (Elf64_Dyn *) (map + dyn_offset);
- while ((void *) dynamic < (void *) (map + dyn_offset + dyn_size)) {
- Elf64_Dyn *curr = dynamic;
-
- dynamic++;
- if (curr->d_tag != DT_NEEDED)
- continue;
-
- if (elf_load_deps(&strtab[curr->d_un.d_val]))
- return -1;
- }
-
- return 0;
-}
-
-int elf_load_deps(char *library)
-{
- unsigned int dyn_offset, dyn_size;
- unsigned int load_offset, load_vaddr;
- struct stat s;
- char *map = NULL, *dir = NULL;
- int clazz, fd, ret = -1;
-
- if (avl_find(&libraries, library))
- return 0;
-
- fd = elf_open(&dir, library);
-
- if (fd < 0) {
- ERROR("failed to open %s\n", library);
- return -1;
- }
-
- if (fstat(fd, &s) == -1) {
- ERROR("failed to stat %s\n", library);
- ret = -1;
- goto err_out;
- }
-
- map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
- if (map == MAP_FAILED) {
- ERROR("failed to mmap %s\n", library);
- ret = -1;
- goto err_out;
- }
-
- if (elf_find_section(map, PT_LOAD, &load_offset, NULL, &load_vaddr)) {
- ERROR("failed to load the .load section from %s\n", library);
- ret = -1;
- goto err_out;
- }
-
- if (elf_find_section(map, PT_DYNAMIC, &dyn_offset, &dyn_size, NULL)) {
- ERROR("failed to load the .dynamic section from %s\n", library);
- ret = -1;
- goto err_out;
- }
-
- if (dir) {
- alloc_library(dir, library);
- } else {
- char *elf = strdup(library);
-
- alloc_library(dirname(elf), basename(library));
- free(elf);
- }
- clazz = map[EI_CLASS];
-
- if (clazz == ELFCLASS32)
- ret = elf32_scan_dynamic(map, dyn_offset, dyn_size, load_vaddr - load_offset);
- else if (clazz == ELFCLASS64)
- ret = elf64_scan_dynamic(map, dyn_offset, dyn_size, load_vaddr - load_offset);
-
-err_out:
- if (map)
- munmap(map, s.st_size);
- close(fd);
-
- return ret;
-}
-
-void load_ldso_conf(const char *conf)
-{
- FILE* fp = fopen(conf, "r");
- char line[256];
-
- if (!fp) {
- DEBUG("failed to open %s\n", conf);
- return;
- }
-
- while (!feof(fp)) {
- int len;
-
- if (!fgets(line, 256, fp))
- break;
- len = strlen(line);
- if (len < 2)
- continue;
- if (*line == '#')
- continue;
- if (line[len - 1] == '\n')
- line[len - 1] = '\0';
- if (!strncmp(line, "include ", 8)) {
- char *sep = strstr(line, " ");
- glob_t gl;
- int i;
-
- if (!sep)
- continue;;
- while (*sep == ' ')
- sep++;
- if (glob(sep, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl)) {
- ERROR("glob failed on %s\n", sep);
- continue;
- }
- for (i = 0; i < gl.gl_pathc; i++)
- load_ldso_conf(gl.gl_pathv[i]);
- globfree(&gl);
- } else {
- struct stat s;
-
- if (stat(line, &s))
- continue;
- alloc_library_path(line);
- }
- }
-
- fclose(fp);
-}
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