trapping execve()

[Sridhar N <srin@symonds.net>]

Hello,
	I wrote a small module to trap and log all calls to execve() but the kernel 
gives a segmentation fault and does not allow me to execute any programs...

extern void * sys_call_table[];
int (*orig_execve)(const char *, char const **,char const **);

int my_execve(const char * path, char const *argv[],char const * envp[])
{
	printk(KERN_DEBUG "execve:%s\n",path);
	return orig_execve(path,argv,envp);
}

int init_module()
{
	orig_execve = sys_call_table[__NR_execve];
	sys_call_table[__NR_execve]= my_execve;
	return 0;
}

void cleanup_module()
{
	sys_call_table[__NR_execve]= orig_execve;
}

-----------

	The same thing works for mkdir and chdir system calls.  execve() is the 
first time i faced this problem.  Is this due to something on stacks ?

regards
Sridhar


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