Execute shell command in kernel module

Question

Is it possible to execute shell command in kernel module. I know that we can do it in user space C code using system subroutine.
I am debugging a kernel module

Answer 1

You can use call_usermodehelper function. See the example of how to use it at the LXR#1 or LXR#2.

UPD:

argv[0] = "/bin/bash";
argv[1] = "-c";
argv[2] = "/usr/bin/free";
argv[3] = NULL;

envp[0] = "HOME=/";
envp[1] = "TERM=linux";
envp[2] = "PATH=/sbin:/usr/sbin:/bin:/usr/bin";
envp[3] = NULL;

call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);