Hello,

I came across the function: call_usermodehelper

This can be used to invoke exec a binary from the kernel space.

It ultimately calls:

call_usermodehelper_exec_async

Which internally does:

retval = do_execve(getname_kernel(sub_info->path),(const char __user *const __user *)sub_info->argv,(const char __user *const __user *)sub_info->envp);

This function works as expected and a new thread is spawned.

Now when I try to directly call do_execve within my module by passing the required arguments, I am getting -EFAULT error.

This is happening in this function:

count(argv, MAX_ARG_STRINGS)

What am I missing here?

Thank you

Hemanth