Re: [PATCH tip v8] x86/setup: Use rng seeds from setup_data

[Borislav Petkov]

On Sat, Jul 09, 2022 at 02:45:24PM -0700, H. Peter Anvin wrote:
> On 7/9/22 02:49, Borislav Petkov wrote:
> > On Fri, Jul 08, 2022 at 06:51:16PM -0700, H. Peter Anvin wrote:
> > > #define SETUP_ENUM_MAX	SETUP_RNG_SEED
> > > #define SETUP_INDIRECT	(1<<31)
> > > #define SETUP_TYPE_MAX	(SETUP_ENUM_MAX | SETUP_INDIRECT)
> > 
> > Wait, if we get to add a new number, SETUP_ENUM_MAX and thus
> > SETUP_TYPE_MAX will change. And they're uapi too...
> 
> Talking API here rather than ABI, i.e. the semantics of those symbols.

Sure but do we worry about some userspace including those headers and
relying on the SETUP_ENUM_MAX number?

Or is userspace required to be recompiled against newer uapi headers?

-- 
Regards/Gruss,
    Boris.

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