linux-kernel - Re: [patch 3/3] x86/vdso: Sanitize vdso*

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Message-ID: <CALCETrU2JOa0Roz_-Vtpq_NZJNFPf-fY=JxeZ+nsA0BMRqtHCg@mail.gmail.com>
Date:   Mon, 10 Apr 2017 08:55:42 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Mathias Krause <minipli@...glemail.com>
Subject: Re: [patch 3/3] x86/vdso: Sanitize vdso*_enabled handling

On Mon, Apr 10, 2017 at 8:14 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> +static int vdso32_sysctl;
> +
> +static int vdso_update_handler(struct ctl_table *table, int write,
> +                              void __user *buffer, size_t *lenp,
> +                              loff_t *ppos)
> +{
> +       int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);

Using a global for the temporary is gross and mildly racy.  I would
just open-code the conversion.  Or, even better, add proc_dobool().

I'm not convinced that the current patch is a cleanup.

--Andy