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Balackburn
290
Tweaks/FLEX/Utility/Runtime/flex_fishhook.c
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290
Tweaks/FLEX/Utility/Runtime/flex_fishhook.c
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// Copyright (c) 2013, Facebook, Inc.
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// All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name Facebook nor the names of its contributors may be used to
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// endorse or promote products derived from this software without specific
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// prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "flex_fishhook.h"
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#include <dlfcn.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <mach/mach.h>
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#include <mach/vm_map.h>
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#include <mach/vm_region.h>
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#include <mach-o/dyld.h>
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#include <mach-o/loader.h>
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#include <mach-o/nlist.h>
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#ifdef __LP64__
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typedef struct mach_header_64 mach_header_t;
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typedef struct segment_command_64 segment_command_t;
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typedef struct section_64 section_t;
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typedef struct nlist_64 nlist_t;
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#define LC_SEGMENT_ARCH_DEPENDENT LC_SEGMENT_64
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#else
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typedef struct mach_header mach_header_t;
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typedef struct segment_command segment_command_t;
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typedef struct section section_t;
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typedef struct nlist nlist_t;
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#define LC_SEGMENT_ARCH_DEPENDENT LC_SEGMENT
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#endif
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#ifndef SEG_DATA_CONST
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#define SEG_DATA_CONST "__DATA_CONST"
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#endif
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struct rebindings_entry {
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struct rebinding *rebindings;
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size_t rebindings_nel;
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struct rebindings_entry *next;
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};
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static struct rebindings_entry *_flex_rebindings_head;
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/// @return 0 on success
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static int flex_prepend_rebindings(struct rebindings_entry **rebindings_head,
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struct rebinding rebindings[],
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size_t nel) {
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struct rebindings_entry *new_entry = (struct rebindings_entry *) malloc(sizeof(struct rebindings_entry));
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if (!new_entry) {
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return -1;
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}
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new_entry->rebindings = (struct rebinding *) malloc(sizeof(struct rebinding) * nel);
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if (!new_entry->rebindings) {
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free(new_entry);
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return -1;
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}
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memcpy(new_entry->rebindings, rebindings, sizeof(struct rebinding) * nel);
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new_entry->rebindings_nel = nel;
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new_entry->next = *rebindings_head;
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*rebindings_head = new_entry;
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return 0;
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}
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static vm_prot_t flex_get_protection(void *sectionStart) {
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mach_port_t task = mach_task_self();
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vm_size_t size = 0;
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vm_address_t address = (vm_address_t)sectionStart;
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memory_object_name_t object;
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#if __LP64__
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mach_msg_type_number_t count = VM_REGION_BASIC_INFO_COUNT_64;
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vm_region_basic_info_data_64_t info;
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kern_return_t info_ret = vm_region_64(
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task, &address, &size, VM_REGION_BASIC_INFO_64,
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(vm_region_info_64_t)&info, &count, &object
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);
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#else
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mach_msg_type_number_t count = VM_REGION_BASIC_INFO_COUNT;
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vm_region_basic_info_data_t info;
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kern_return_t info_ret = vm_region(
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task, &address, &size, VM_REGION_BASIC_INFO, (vm_region_info_t)&info, &count, &object
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);
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#endif
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if (info_ret == KERN_SUCCESS) {
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return info.protection;
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} else {
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return VM_PROT_READ;
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}
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}
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static void flex_perform_rebinding_with_section(struct rebindings_entry *rebindings,
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section_t *section,
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intptr_t slide,
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nlist_t *symtab,
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char *strtab,
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uint32_t *indirect_symtab) {
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const bool isDataConst = strcmp(section->segname, "__DATA_CONST") == 0;
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uint32_t *indirect_symbol_indices = indirect_symtab + section->reserved1;
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void **indirect_symbol_bindings = (void **)((uintptr_t)slide + section->addr);
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vm_prot_t oldProtection = VM_PROT_READ;
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if (isDataConst) {
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oldProtection = flex_get_protection(rebindings);
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mprotect(indirect_symbol_bindings, section->size, PROT_READ | PROT_WRITE);
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}
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for (uint i = 0; i < section->size / sizeof(void *); i++) {
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uint32_t symtab_index = indirect_symbol_indices[i];
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if (symtab_index == INDIRECT_SYMBOL_ABS || symtab_index == INDIRECT_SYMBOL_LOCAL ||
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symtab_index == (INDIRECT_SYMBOL_LOCAL | INDIRECT_SYMBOL_ABS)) {
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continue;
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}
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uint32_t strtab_offset = symtab[symtab_index].n_un.n_strx;
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char *symbol_name = strtab + strtab_offset;
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bool symbol_name_longer_than_1 = symbol_name[0] && symbol_name[1];
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struct rebindings_entry *cur = rebindings;
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while (cur) {
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for (uint j = 0; j < cur->rebindings_nel; j++) {
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if (symbol_name_longer_than_1 &&
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strcmp(&symbol_name[1], cur->rebindings[j].name) == 0) {
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if (cur->rebindings[j].replaced != NULL &&
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indirect_symbol_bindings[i] != cur->rebindings[j].replacement) {
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*(cur->rebindings[j].replaced) = indirect_symbol_bindings[i];
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}
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indirect_symbol_bindings[i] = cur->rebindings[j].replacement;
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goto symbol_loop;
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}
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}
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cur = cur->next;
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}
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symbol_loop:;
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}
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if (isDataConst) {
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int protection = 0;
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if (oldProtection & VM_PROT_READ) {
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protection |= PROT_READ;
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}
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if (oldProtection & VM_PROT_WRITE) {
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protection |= PROT_WRITE;
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}
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if (oldProtection & VM_PROT_EXECUTE) {
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protection |= PROT_EXEC;
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}
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mprotect(indirect_symbol_bindings, section->size, protection);
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}
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}
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static void flex_rebind_symbols_for_image(struct rebindings_entry *rebindings,
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const struct mach_header *header,
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intptr_t slide) {
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Dl_info info;
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if (dladdr(header, &info) == 0) {
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return;
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}
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segment_command_t *cur_seg_cmd;
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segment_command_t *linkedit_segment = NULL;
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struct symtab_command* symtab_cmd = NULL;
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struct dysymtab_command* dysymtab_cmd = NULL;
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uintptr_t cur = (uintptr_t)header + sizeof(mach_header_t);
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for (uint i = 0; i < header->ncmds; i++, cur += cur_seg_cmd->cmdsize) {
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cur_seg_cmd = (segment_command_t *)cur;
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if (cur_seg_cmd->cmd == LC_SEGMENT_ARCH_DEPENDENT) {
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if (strcmp(cur_seg_cmd->segname, SEG_LINKEDIT) == 0) {
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linkedit_segment = cur_seg_cmd;
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}
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} else if (cur_seg_cmd->cmd == LC_SYMTAB) {
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symtab_cmd = (struct symtab_command*)cur_seg_cmd;
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} else if (cur_seg_cmd->cmd == LC_DYSYMTAB) {
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dysymtab_cmd = (struct dysymtab_command*)cur_seg_cmd;
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}
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}
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if (!symtab_cmd || !dysymtab_cmd || !linkedit_segment ||
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!dysymtab_cmd->nindirectsyms) {
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return;
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}
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// Find base symbol/string table addresses
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uintptr_t linkedit_base = (uintptr_t)slide + linkedit_segment->vmaddr - linkedit_segment->fileoff;
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nlist_t *symtab = (nlist_t *)(linkedit_base + symtab_cmd->symoff);
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char *strtab = (char *)(linkedit_base + symtab_cmd->stroff);
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// Get indirect symbol table (array of uint32_t indices into symbol table)
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uint32_t *indirect_symtab = (uint32_t *)(linkedit_base + dysymtab_cmd->indirectsymoff);
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cur = (uintptr_t)header + sizeof(mach_header_t);
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for (uint i = 0; i < header->ncmds; i++, cur += cur_seg_cmd->cmdsize) {
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cur_seg_cmd = (segment_command_t *)cur;
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if (cur_seg_cmd->cmd == LC_SEGMENT_ARCH_DEPENDENT) {
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if (strcmp(cur_seg_cmd->segname, SEG_DATA) != 0 &&
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strcmp(cur_seg_cmd->segname, SEG_DATA_CONST) != 0) {
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continue;
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}
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for (uint j = 0; j < cur_seg_cmd->nsects; j++) {
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section_t *sect = (section_t *)(cur + sizeof(segment_command_t)) + j;
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if ((sect->flags & SECTION_TYPE) == S_LAZY_SYMBOL_POINTERS) {
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flex_perform_rebinding_with_section(
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rebindings, sect, slide, symtab, strtab, indirect_symtab
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);
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}
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if ((sect->flags & SECTION_TYPE) == S_NON_LAZY_SYMBOL_POINTERS) {
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flex_perform_rebinding_with_section(
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rebindings, sect, slide, symtab, strtab, indirect_symtab
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);
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}
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}
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}
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}
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}
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static void _flex_rebind_symbols_for_image(const struct mach_header *header,
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intptr_t slide) {
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flex_rebind_symbols_for_image(_flex_rebindings_head, header, slide);
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}
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int flex_rebind_symbols_image(void *header,
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intptr_t slide,
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struct rebinding rebindings[],
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size_t rebindings_nel) {
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struct rebindings_entry *rebindings_head = NULL;
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int retval = flex_prepend_rebindings(&rebindings_head, rebindings, rebindings_nel);
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flex_rebind_symbols_for_image(rebindings_head, (const struct mach_header *) header, slide);
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if (rebindings_head) {
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free(rebindings_head->rebindings);
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}
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free(rebindings_head);
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return retval;
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}
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/// @return 0 on success
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int flex_rebind_symbols(struct rebinding rebindings[], size_t rebindings_nel) {
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int retval = flex_prepend_rebindings(&_flex_rebindings_head, rebindings, rebindings_nel);
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if (retval < 0) {
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return retval;
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}
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// If this was the first call, register callback for image additions (which is also invoked for
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// existing images, otherwise, just run on existing images
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if (!_flex_rebindings_head->next) {
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_dyld_register_func_for_add_image(_flex_rebind_symbols_for_image);
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} else {
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uint32_t c = _dyld_image_count();
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for (uint32_t i = 0; i < c; i++) {
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_flex_rebind_symbols_for_image(_dyld_get_image_header(i), _dyld_get_image_vmaddr_slide(i));
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}
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}
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return retval;
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}
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