linux-kernel - Re: [PATCH v6 24/26] powerpc/pseries: Implement secvars for dynamic secure boot

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Date:   Mon, 13 Feb 2023 18:06:36 +1100
From:   Andrew Donnellan <ajd@...ux.ibm.com>
To:     Stefan Berger <stefanb@...ux.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-integrity@...r.kernel.org
Cc:     ruscur@...sell.cc, bgray@...ux.ibm.com, nayna@...ux.ibm.com,
        gcwilson@...ux.ibm.com, gjoyce@...ux.ibm.com, brking@...ux.ibm.com,
        sudhakar@...ux.ibm.com, erichte@...ux.ibm.com,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        zohar@...ux.ibm.com, joel@....id.au, npiggin@...il.com
Subject: Re: [PATCH v6 24/26] powerpc/pseries: Implement secvars for dynamic
 secure boot

On Fri, 2023-02-10 at 16:23 -0500, Stefan Berger wrote:
> > +       memcpy(&flags, data, sizeof(flags));
> 
> conversion from bytestream to integer: I think in this case it would
> be better to use
> 
> flags = cpu_to_be64p((__u64*)data);
> 
> so that the flags always in hypervisor/big endian format

Thanks for catching this - it turns out we weren't properly testing the
one flag that exists (append vs replace) in our test script, so I
didn't notice this.

-- 
Andrew Donnellan    OzLabs, ADL Canberra
ajd@...ux.ibm.com   IBM Australia Limited