Re: select() for delay.

[Steven Rostedt <rostedt@goodmis.org>]

Hi Maduhu,

On Mon, 2005-10-24 at 16:25 +0530, madhu.subbaiah@wipro.com wrote:

> +                        put_user(sec, &tvp->tv_sec);
> +                        put_user(usec, &tvp->tv_usec);

I won't comment on the rest of the patch, but this part is definitely
wrong.  The pointer tvp is a user space address and once you dereference
that pointer to get to tv_sec, you can have a fault, which might
segfault the processes.

What you really want is something like:

{
	timeval tv;

	tv.tv_sec = sec;
	tv.tv_usec = usec;
	copy_to_user(tvp, &tv, sizeof(tv));
}

-- Steve


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