linux-kernel - Re: [PATCH v5 1/6] x86/sev: Fix calculation of end address based on number of pages

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Date:   Tue, 27 Sep 2022 12:04:30 -0700
From:   Dionna Amalie Glaze <dionnaglaze@...gle.com>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        "H. Peter Anvin" <hpa@...or.com>,
        Michael Roth <michael.roth@....com>,
        Joerg Roedel <jroedel@...e.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v5 1/6] x86/sev: Fix calculation of end address based on
 number of pages

>
> When calculating an end address based on an unsigned int number of pages,
> the number of pages must be cast to an unsigned long so that any value
> greater than or equal to 0x100000 does not result in zero after the shift.
>
> Fixes: 5e5ccff60a29 ("x86/sev: Add helper for validating pages in early enc attribute changes")

Tested-by: Dionna Glaze <dionnaglaze@...gle.com>

-- 
-Dionna Glaze, PhD (she/her)