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从内核linux中的pid获取完整的进程路径

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我正在为我的设备构建自定义内核linux（如嵌入式设备） . 我想记录kill系统调用的所有信息 . 所以我在kill系统调用中修改代码并获取pid来杀死 . 但我无法获得完整的流程路径，我只是获得当前流程的完整路径 . 这是我从pid获取进程路径的代码 .

long GetProcessPathFromPid(const pid_t p_id, char* pszProcessPath, int iSize)
{
    struct task_struct *task = NULL;
    struct pid *pid_struct = NULL;
    struct mm_struct *mm = NULL;
    //struct file *exe_file = NULL;
    //char buf[256] = {0};
    //char *result = ERR_PTR(-ENOENT);
    //int iResultLength = 0;

    pid_struct = find_get_pid(p_id);
    if (pid_struct == NULL)
    {
        printk("Fail to find_get_pid.\n");
    }
    task = pid_task(pid_struct, PIDTYPE_PID);                               // Get task_struct
    if (task == NULL) 
    {
        printk("Fail to pid_task.\n");
    }
    mm = get_task_mm(task);                                                // Get mm of task_struct
    mmput(mm);

    printk("Finish hook kill process\n.");
    return 0;                                              // Get mm of task_struct
}

更新固件时出错：

Call Trace:
[<8042971c>] printk+0x24/0x30
[<800c37c8>] GetProcessPathFromPid+0x38/0x88
[<800c3b60>] LogKillProcess+0x64/0xf4
[<800443d4>] sys_kill+0x30/0x1d8
[<800354b0>] do_wait+0x11c/0x220
[<8042e234>] wait_for_completion_killable+0x18/0x30
[<80043a3c>] set_current_blocked+0x30/0x48
[<80533210>] repair_env_string+0x0/0x94
[<8003664c>] sys_wait4+0x80/0xfc
[<800344d8>] child_wait_callback+0x0/0x8c
[<80533210>] repair_env_string+0x0/0x94
[<8001b59c>] stack_done+0x20/0x40
[<800b07a8>] sys_close+0x0/0x158
[<80533210>] repair_env_string+0x0/0x94


Call Trace:
[<8042fe88>] _raw_spin_lock+0x10/0x3c
[<8002ef68>] get_task_mm+0x20/0x7c
[<800c37c8>] GetProcessPathFromPid+0x38/0x88
[<800c3b60>] LogKillProcess+0x64/0xf4
[<800443d4>] sys_kill+0x30/0x1d8
[<8001b59c>] stack_done+0x20/0x40


Code: 24630001  af830014  3c020001 <c0830000> 00622821  e0850000  10a0fffc  00032c02  3063ffff 
pe=GPON

---[ end trace aee100dae37dfc66 ]---
note: init[1] exited with preempt_count 1
FinWLmngr Daeish hook kill process
.mon is running
 !!!!   PLL locked !!!!!!     !!!!   RX CDR locked !!!!!!     !!!!   TX CDR locked !!!!!!    GPON BEN Calibration Done 
GPON SerDes Initialization Sequence Done 
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

你能帮助我吗？谢谢！

c linux-kernel

1 回答

  • 0

    我找到了从pid获取完整路径进程的方法 . 完整路径进程是/ proc // exe的符号链接，所以我必须找到它的符号链接 . 这是代码：

    long GetSymLinkOfFile(const char *pzsFilePath, char *pszRealPath, int iSize)
{
    struct path path_struct;
    char pszBuffer[256];
    char *result = ERR_PTR(-ENOENT);
    int err = 0;
    int iLengthOfResult = 0;

    if (pzsFilePath == NULL || pszRealPath == NULL)
    {
        printk("Buffer is NULL.\n");
        return -EINVAL;
    }

    err = kern_path(pzsFilePath, LOOKUP_FOLLOW, &path_struct);

    if (err < 0)
    {
        printk("kern_path error, error code: %d", err);
        return iLengthOfResult;
    }

    result = d_path(&path_struct, pszBuffer, 256);

    if (IS_ERR(result) == true)
    {
        printk("d_path GetSymlink error: %s", result);
        return iLengthOfResult;
    }

    iLengthOfResult = strlen(result);

    if (iLengthOfResult <= iSize)
        strcpy(pszRealPath, result);

    return iLengthOfResult;
}
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