Subject: Re: [PATCH v3] kptr_restrict for hiding kernel pointers

From: [email-masked]
Date: Mon, 20 Dec 2010 17:26:31 -0500

On Sat, 18 Dec 2010 12:20:34 EST, Dan Rosenberg said:

> @@ -1035,6 +1038,26 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
>  		return buf + vsnprintf(buf, end - buf,
>  				       ((struct va_format *)ptr)->fmt,
>  				       *(((struct va_format *)ptr)->va));
> +	case 'K':
> +		/*
> +		 * %pK cannot be used in IRQ context because it tests
> +		 * CAP_SYSLOG.
> +		 */
> +		if (in_irq() || in_serving_softirq() || in_nmi())
> +			WARN_ONCE(1, "%%pK used in interrupt context.\n");

Should this then continue on and test CAP_SYSLOG anyhow, or should it
return a "" or or "<invalid>" or something?