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Full Discussion: Execute code in kernel mode.
Top Forums Programming Execute code in kernel mode. Post 302504454 by Corona688 on Monday 14th of March 2011 04:05:12 PM
Old 03-14-2011
LD_PRELOAD will work for you then. Take a look at the code used in libkeepalive, it overrides socket(), you should be able to override gettimeofday() the same way. Force your fake library to be overloaded first with LD_PRELOAD="/path/to/my/fake/library.so" and it will call timeofday from it instead if it finds it there.

Do not export LD_PRELOAD="..." for the whole system, just when running that application. You could mess up your system pretty severely if it got preloaded in places you didn't intend.
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KLDLOAD(2)						      BSD System Calls Manual							KLDLOAD(2)

NAME
kldload -- load KLD files into the kernel LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/param.h> #include <sys/linker.h> int kldload(const char *file); DESCRIPTION
The kldload() system call loads a kld file into the kernel using the kernel linker. RETURN VALUES
The kldload() system call returns the fileid of the kld file which was loaded into the kernel. If an error occurs, kldload() will return -1 and set errno to indicate the error. ERRORS
The named file is loaded unless: [EPERM] You do not have access to read the file or link it with the kernel. You should be the root user to be able to use the kld system calls. [EFAULT] Bad address encountered when adding kld info into the kernel space. [ENOMEM] There is no memory to load the file into the kernel. [ENOENT] The file was not found. [ENOEXEC] The file format of file was unrecognized. [EEXIST] The supplied file has already been loaded. SEE ALSO
kldfind(2), kldfirstmod(2), kldnext(2), kldstat(2), kldsym(2), kldunload(2), modfind(2), modfnext(2), modnext(2), modstat(2), kld(4), kldload(8) HISTORY
The kld interface first appeared in FreeBSD 3.0. BSD
March 3, 1999 BSD
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