CODEWITHSUNDEEP
linuxlinux-kernel
likeIT
likeIT

Reputation: 453

changing kernel of Linux

everyone, I'm trying to learn how to work with Kernel of the Linux Red Hat, I tried to change some function from kernel:

/*
 * sys_execve() executes a new program.
 */
asmlinkage int sys_execve(struct pt_regs regs)
{
    int error;
    char * filename;



    filename = getname((char *) regs.ebx);
    error = PTR_ERR(filename);
    if (IS_ERR(filename))
        goto out;

    printk("Hello World!"); // I added this function

    error = do_execve(filename, (char **) regs.ecx, (char **) regs.edx, &regs);
    if (error == 0)
        current->ptrace &= ~PT_DTRACE;
    putname(filename);
out:
    return error;
}

this system call executes programs, my question why while I'm in terminal and writing some function for example 'date' I don't receive my hello world, thanks in advance for any help

Upvotes: 2

Views: 666

Answers (1)

geekosaur
geekosaur

Reputation: 61457

printk() should be logged to /proc/kmsg, which in turn is read and logged by syslog(8).

Upvotes: 2

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