Re: [PATCH v12 6/8] x86/traps: Communicate a LASS violation in #GP message

[Borislav Petkov]

On Mon, Nov 17, 2025 at 11:45:38AM -0800, Sohil Mehta wrote:
> Would this update to the comment help clarify?

Yap, that LGTM.

> 	/*
> 	 * A NULL pointer dereference usually causes a #PF. However, it
> 	 * can result in a #GP when LASS is active. Provide the same
> 	 * hint in the rare case that the condition is hit without LASS.
> 	 */
> 	if (*addr < PAGE_SIZE)
> 		return GP_NULL_POINTER;
> 
> 	/*
> 	 * Assume that LASS caused the exception, because the address is
> 	 * canonical and in the user half.
> 	 */
> 	if (cpu_feature_enabled(X86_FEATURE_LASS))
> 		return GP_LASS_VIOLATION;

Thx.

-- 
Regards/Gruss,
    Boris.

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