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SubjectRE: execve replacement.
I need that somebody says to my module when a user application has started
or finished, and what is its name and pid.

I have rewritten my function and it seems that it works well.

Remember; it is only an example:

extern void *sys_call_table[];

asmlinkage int (*system_execve)(struct pt_regs);
asmlinkage int (*system_kill)(pid_t, int);
asmlinkage void (*system_exit)(int);

asmlinkage int my_kill(pid_t pid, int sign)
printk("\nPROCMON: Killing process %d.\n", pid);

return system_kill(pid, sign);

asmlinkage void my_exit(int status)
printk("\nPROCMON: Exiting process %d.\n", current->pid);

return system_exit(status);

asmlinkage int my_execve(struct pt_regs regs)
int error;
char * filename;


filename = getname((char *) regs.ebx); //What does getname() do?
error = PTR_ERR(filename);
if (IS_ERR(filename))

return error;

error = do_execve(filename, (char **) regs.ecx, (char **) regs.edx, &regs);
if (error == 0)
current->flags &= ~PF_DTRACE; // ?????

printk("\nPROCMON: Executing process (%d) %s\n", current->pid, filename);

putname(filename); //What does putname() do?


return error;

int init_module()
system_execve = sys_call_table[__NR_execve];
system_kill = sys_call_table[__NR_kill];
system_exit = sys_call_table[__NR_exit];

sys_call_table[__NR_execve] = my_execve;
sys_call_table[__NR_kill] = my_kill;
sys_call_table[__NR_exit] = my_exit;

return 0;

void cleanup_module()
if (sys_call_table[__NR_execve] != my_execve)
printk(KERN_INFO "\nThe system has been left in a unpredictable
state.\nPlease, reboot it.\n");

sys_call_table[__NR_exit] = system_exit;
sys_call_table[__NR_kill] = system_kill;
sys_call_table[__NR_execve] = system_execve;

If you know a better way, please say me.


-----Original Message-----
From: John Levon []
Sent: miércoles, 04 de octubre de 2000 16:21
To: Abel Muñoz Alcaraz
Subject: RE: execve replacement.

On Wed, 4 Oct 2000, [iso-8859-1] Abel Muñoz Alcaraz wrote:

> I need to create a processes hook.
> Do you know an other way?
> -Abel.

what do you mean by a hook ? what exact info do you need and when ? than


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