Mach/Inject.cpp

   1 /* Cycript - Inlining/Optimizing JavaScript Compiler
   2  * Copyright (C) 2009  Jay Freeman (saurik)
   3 */
   4
   5 /* Modified BSD License {{{ */
   6 /*
   7  *        Redistribution and use in source and binary
   8  * forms, with or without modification, are permitted
   9  * provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the
  12  *    above copyright notice, this list of conditions
  13  *    and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the
  15  *    above copyright notice, this list of conditions
  16  *    and the following disclaimer in the documentation
  17  *    and/or other materials provided with the
  18  *    distribution.
  19  * 3. The name of the author may not be used to endorse
  20  *    or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
  24  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
  25  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  26  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  29  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  31  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  34  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  35  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  36  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37 */
  38 /* }}} */
  39
  40 #include <dlfcn.h>
  41 #include <mach/mach.h>
  42
  43 #include <mach/i386/thread_status.h>
  44
  45 #include <cstdio>
  46 #include <pthread.h>
  47 #include <unistd.h>
  48
  49 #include "Baton.hpp"
  50 #include "Exception.hpp"
  51 #include "Pooling.hpp"
  52 #include "Trampoline.t.hpp"
  53
  54 extern "C" void __pthread_set_self(pthread_t);
  55
  56 void InjectLibrary(pid_t pid) {
  57     // DOUG: turn this into some kind of -D passed from configure
  58     const char *library("/usr/lib/libcycript.dylib");
  59
  60     static const size_t Stack_(8 * 1024);
  61     size_t length(strlen(library) + 1), depth(sizeof(Baton) + length);
  62     depth = (depth + sizeof(uintptr_t) + 1) / sizeof(uintptr_t) * sizeof(uintptr_t);
  63
  64     CYPool pool;
  65     uint8_t *local(reinterpret_cast<uint8_t *>(apr_palloc(pool, depth)));
  66     Baton *baton(reinterpret_cast<Baton *>(local));
  67
  68     baton->__pthread_set_self = &__pthread_set_self;
  69
  70     baton->pthread_create = &pthread_create;
  71     baton->pthread_join = &pthread_join;
  72
  73     baton->dlopen = &dlopen;
  74     baton->dlsym = &dlsym;
  75
  76     baton->mach_thread_self = &mach_thread_self;
  77     baton->thread_terminate = &thread_terminate;
  78
  79     baton->pid = getpid();
  80     memcpy(baton->library, library, length);
  81
  82     vm_size_t size(depth + Stack_);
  83
  84     mach_port_t self(mach_task_self()), task;
  85     _krncall(task_for_pid(self, pid, &task));
  86
  87     vm_address_t stack;
  88     _krncall(vm_allocate(task, &stack, size, true));
  89     vm_address_t data(stack + Stack_);
  90
  91     vm_write(task, data, reinterpret_cast<vm_address_t>(baton), depth);
  92
  93     thread_act_t thread;
  94     _krncall(thread_create(task, &thread));
  95
  96     thread_state_flavor_t flavor;
  97     mach_msg_type_number_t count;
  98     size_t push;
  99
 100     Trampoline *trampoline;
 101
 102 #if defined(__arm__)
 103     trampoline = &Trampoline_arm_;
 104     arm_thread_state_t state;
 105     flavor = ARM_THREAD_STATE;
 106     count = ARM_THREAD_STATE_COUNT;
 107     push = 0;
 108 #elif defined(__i386__)
 109     trampoline = &Trampoline_i386_;
 110     i386_thread_state_t state;
 111     flavor = i386_THREAD_STATE;
 112     count = i386_THREAD_STATE_COUNT;
 113     push = 5;
 114 #elif defined(__x86_64__)
 115     trampoline = &Trampoline_x86_64_;
 116     x86_thread_state64_t state;
 117     flavor = x86_THREAD_STATE64;
 118     count = x86_THREAD_STATE64_COUNT;
 119     push = 2;
 120 #else
 121     #error XXX: implement
 122 #endif
 123
 124     vm_address_t code;
 125     _krncall(vm_allocate(task, &code, trampoline->size_, true));
 126     vm_write(task, code, reinterpret_cast<vm_address_t>(trampoline->data_), trampoline->size_);
 127     _krncall(vm_protect(task, code, trampoline->size_, false, VM_PROT_READ | VM_PROT_EXECUTE));
 128
 129     /*
 130     printf("_ptss:%p\n", baton->__pthread_set_self);
 131     printf("dlsym:%p\n", baton->dlsym);
 132     printf("code:%zx\n", (size_t) code);
 133     */
 134
 135     uint32_t frame[push];
 136     if (sizeof(frame) != 0)
 137         memset(frame, 0, sizeof(frame));
 138     memset(&state, 0, sizeof(state));
 139
 140     mach_msg_type_number_t read(count);
 141     _krncall(thread_get_state(thread, flavor, reinterpret_cast<thread_state_t>(&state), &read));
 142     _assert(count == count);
 143
 144 #if defined(__arm__)
 145     state.r[0] = data;
 146     state.sp = stack + Stack_;
 147     state.pc = code + trampoline->entry_;
 148
 149     if ((state.pc & 0x1) != 0) {
 150         state.pc &= ~0x1;
 151         state.cpsr |= 0x20;
 152     }
 153 #elif defined(__i386__)
 154     frame[1] = data;
 155
 156     state.__eip = code + trampoline->entry_;
 157     state.__esp = stack + Stack_ - sizeof(frame);
 158 #elif defined(__x86_64__)
 159     frame[0] = 0xdeadbeef;
 160     state.__rdi = data;
 161     state.__rip = code + trampoline->entry_;
 162     state.__rsp = stack + Stack_ - sizeof(frame);
 163 #else
 164     #error XXX: implement
 165 #endif
 166
 167     if (sizeof(frame) != 0)
 168         vm_write(task, stack + Stack_ - sizeof(frame), reinterpret_cast<vm_address_t>(frame), sizeof(frame));
 169
 170     _krncall(thread_set_state(thread, flavor, reinterpret_cast<thread_state_t>(&state), count));
 171     _krncall(thread_resume(thread));
 172
 173     _krncall(mach_port_deallocate(self, task));
 174 }