Re: [PATCH][2.4] cleanup ptrace secfix and fix most side effects

[Alan Cox]

On Iau, 2003-05-08 at 23:05, Bernhard Kaindl wrote:
> -	mb();
> -	if (!is_dumpable(child))
> -		return -EPERM;
> 
>  	if (!(child->ptrace & PT_PTRACED))
>  		return -ESRCH;
> 
> Using is_dumpable() here is not neccesary because the checks done here are:
> 
> >        if (!(child->ptrace & PT_PTRACED))
> >                return -ESRCH;

Except that current->mm->dumpable is not per task but per mm so you
might ptrace one thread and have another go setuid.