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mac_dump.c
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mac_dump.c
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/*
* mac_dump - dump memory from a target process
*
* Written by Dean Pucsek <[email protected]>
* Copyright 2011, All rights reserved.
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <mach/mach.h>
#include <mach/mach_traps.h>
#include <mach/mach_vm.h>
#include <mach/kern_return.h>
int fork_calculator() {
int pid = fork();
if(pid < 0) {
fprintf(stderr, "fork error\n");
return -1;
} else if(pid == 0) { /* child */
execl("/Applications/Calculator.app/Contents/MacOS/Calculator",
"/Applications/Calculator.app/Contents/MacOS/Calculator",
NULL);
perror("execl");
} else { /* parent */
sleep(1); /* this is necessary */
return pid;
}
return -1;
}
int mem_dump(mach_port_name_t tport) {
kern_return_t ret = 0;
pointer_t data;
mach_msg_type_number_t data_size;
long dump_base_addr = 0x10000190c;
long dump_size = 0x1000;
ret = mach_vm_read(tport, dump_base_addr, dump_size, &data, &data_size);
if(ret != KERN_SUCCESS) {
fprintf(stderr, "mem_dump: failed to read data at 0x%lx (0x%x)\n", dump_base_addr, ret);
return -1;
}
int fd;
fd = open("mem.dump", O_CREAT|O_RDWR, S_IRWXU);
if(fd == -1) {
perror("open");
return -1;
}
if(write(fd, (const void *)data, (size_t)data_size) == -1) {
perror("write");
return -1;
}
return 0;
}
int main(int argc, char **argv) {
kern_return_t ret = -1;
mach_port_name_t tport = -1;
int tpid = -1;
tpid = fork_calculator();
ret = task_for_pid(mach_task_self(), tpid, &tport);
if(ret != KERN_SUCCESS) {
fprintf(stderr, "main: failed to get task for pid %d (%d)\n", tpid, ret);
return -1;
}
if(mem_dump(tport) < 0) {
fprintf(stderr, "main: failed to dump memory\n");
return -1;
}
kill(tpid, SIGTERM);
return 0;
}