On 11/15/2012 03:06 AM, Pavel Machek wrote:
> Hi!
>
> Supervisor Mode Access Prevention (X86_SMAP) [Y/n/?] (NEW)
>
> ...Slows stuff down, eats memory, only works on unreleased Intel CPUs
> (from 2013!) perhaps should be off by default?
>
> "Supervisor Mode Access Prevention (SMAP) is a security
> feature in newer Intel processors. There is a small
> performance cost if this enabled and turned on; there is
> also a small increase in the kernel size if this is enabled."
>
*Extremely* small. Unless you are targeting a specific processor there
is no point in disabling it. If anyone can find a non-SMAP processor on
which the overhead is measurable I would be highly surprised, except
perhaps some embedded 486 clone.
-hpa
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
