在Mac OSX中获取进程基址

Question

我正在尝试使用task_for_pid/ 读取进程的内存vm_read.

uint32_t sz;
pointer_t buf;
task_t task;
pid_t pid = 9484;
kern_return_t error = task_for_pid(current_task(), pid, &task);
vm_read(task, 0x10e448000, 2048, &buf, &sz);

在这种情况下,我读取前2048字节.

当我知道进程的基地址(我可以使用gdb"info shared" - 在这种情况下0x10e448000找到)时,这是有效的,但是如何在运行时找到基址(不用gdb查看)？

Answer 1

回答我自己的问题.我能够使用mach_vm_region_recurse如下所示获得基地址.抵消了vmoffset.如果还有另一种更"正确"的方式 - 请毫不犹豫地发表评论!

#include <stdio.h>
#include <mach/mach_init.h>
#include <sys/sysctl.h>
#include <mach/mach_vm.h>

 ...

    mach_port_name_t task;
    vm_map_offset_t vmoffset;
    vm_map_size_t vmsize;
    uint32_t nesting_depth = 0;
    struct vm_region_submap_info_64 vbr;
    mach_msg_type_number_t vbrcount = 16;
    kern_return_t kr;

    if ((kr = mach_vm_region_recurse(task, &vmoffset, &vmsize,
                 &nesting_depth,
                 (vm_region_recurse_info_t)&vbr,
                 &vbrcount)) != KERN_SUCCESS) 
    {
        printf("FAIL");
    }

Answer 2

因为你正在调用current_task(),所以我假设你在运行时瞄准自己的进程.所以你提到的基地址应该是动态基地址,即ASLR引起的静态基地址+图像滑动,对吧？基于此假设,您可以使用"Section and Segment Accessors"获取进程的静态基址,然后使用dyld函数获取图像幻灯片.这是一个片段:

#import <Foundation/Foundation.h>
#include </usr/include/mach-o/getsect.h>
#include <stdio.h>
#include </usr/include/mach-o/dyld.h>
#include <string.h>

uint64_t StaticBaseAddress(void)
{
    const struct segment_command_64* command = getsegbyname("__TEXT");
    uint64_t addr = command->vmaddr;
    return addr;
}

intptr_t ImageSlide(void)
{
    char path[1024];
    uint32_t size = sizeof(path);
    if (_NSGetExecutablePath(path, &size) != 0) return -1;
    for (uint32_t i = 0; i < _dyld_image_count(); i++)
    {
        if (strcmp(_dyld_get_image_name(i), path) == 0)
            return _dyld_get_image_vmaddr_slide(i);
    }
    return 0;
}

uint64_t DynamicBaseAddress(void)
{
    return StaticBaseAddress() + ImageSlide();
}

int main (int argc, const char *argv[])
{
    printf("dynamic base address (%0llx) = static base address (%0llx) + image slide (%0lx)\n", DynamicBaseAddress(), StaticBaseAddress(), ImageSlide());
    while (1) {}; // you can attach to this process via gdb/lldb to view the base address now :)
    return 0;
}

希望能帮助到你!