linux-kernel - Re: [PATCH V4 1/4] xen: Make struct privcmd_irqfd's layout architecture independent

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Message-ID: <ca0690eb-1f3b-4508-9cf2-079b5ad12e26@suse.com>
Date:   Mon, 16 Oct 2023 09:13:29 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        Alex Bennée <alex.bennee@...aro.org>,
        stratos-dev@...lists.linaro.org,
        Erik Schilling <erik.schilling@...aro.org>,
        Manos Pitsidianakis <manos.pitsidianakis@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Arnd Bergmann <arnd@...nel.org>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 1/4] xen: Make struct privcmd_irqfd's layout
 architecture independent

On 16.10.23 09:11, Viresh Kumar wrote:
> Using indirect pointers in an ioctl command argument means that the
> layout is architecture specific, in particular we can't use the same one
> from 32-bit compat tasks. The general recommendation is to have __u64
> members and use u64_to_user_ptr() to access it from the kernel if we are
> unable to avoid the pointers altogether.
> 
> Fixes: f8941e6c4c71 ("xen: privcmd: Add support for irqfd")
> Reported-by: Arnd Bergmann <arnd@...nel.org>
> Closes: https://lore.kernel.org/all/268a2031-63b8-4c7d-b1e5-8ab83ca80b4a@app.fastmail.com/
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen


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