linux-kernel - Re: [PATCH] xen: detect uninitialized xenbus in xenbus

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Message-ID: <fdfe4ba4-8f5f-47a2-98df-3dfdb50d8f6f@oracle.com>
Date:   Thu, 18 Nov 2021 17:24:46 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Stefano Stabellini <sstabellini@...nel.org>,
        Juergen Gross <jgross@...e.com>
Cc:     Jan Beulich <jbeulich@...e.com>, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org,
        Stefano Stabellini <stefano.stabellini@...inx.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH] xen: detect uninitialized xenbus in xenbus_init


On 11/18/21 4:00 PM, Stefano Stabellini wrote:
>
>          /*
>           * Avoid truncation on 32-bit.
>           * TODO: handle addresses >= 4G
>           */
>          if ( v >= ~0UL ) {
>              err = -EINVAL;
>              goto out_error;
>          }


Since this is only relevant to 32-bit kernels then "#if BITS_PER_LONG == 32".


-boris