Re: [PATCH] kernel/capability.c get_task_comm compile error (MMOTM)

[Erez Zadok <ezk@cs.sunysb.edu>]

In message <20071111141510.GA29126@elte.hu>, Ingo Molnar writes:
> 
> * Erez Zadok <ezk@cs.sunysb.edu> wrote:
> 
> > Small patch below fixes compile error.
> 
> > +			char name[sizeof(current->comm)];
> >  			warned++;
> >  			printk(KERN_INFO
> >  			       "warning: process `%s' sets w/ old libcap\n",
> > -			       get_task_comm(current));
> > +			       get_task_comm(name, current));
> 
> that's buggy - get_task_comm() returns void.
> 
> the proper fix would be to first do a get_task_comm() then pass in 
> 'name' as an argument to printk.
> 
> 	Ingo

Ingo, I don't see how it can return NULL.  This is what get_task_comm looks
like in MMOTM-2007-11-10-19-05:

char *get_task_comm(char *buf, struct task_struct *tsk)
{
	/* buf must be at least sizeof(tsk->comm) in size */
	task_lock(tsk);
	strncpy(buf, tsk->comm, sizeof(tsk->comm));
	task_unlock(tsk);
	return buf;
}

The only way it'd return NULL is if a null buf was passed, in which case the
strncpy will oops first.

Erez.
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