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Date:   Fri, 3 May 2019 00:09:22 +0300
From:   Cyrill Gorcunov <gorcunov@gmail.com>
To:     Joel Savitz <jsavitz@redhat.com>
Cc:     linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Waiman Long <longman@redhat.com>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        Kristina Martsenko <kristina.martsenko@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Kees Cook <keescook@chromium.org>,
        "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
        YueHaibing <yuehaibing@huawei.com>,
        Micah Morton <mortonm@chromium.org>,
        Yang Shi <yang.shi@linux.alibaba.com>,
        Jann Horn <jannh@google.com>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        Rafael Aquini <aquini@redhat.com>,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Yury Norov <norov.maillist@gmail.com>
Subject: Re: [PATCH v2 1/2] kernel/sys: add PR_GET_TASK_SIZE option to
 prctl(2)
Message-ID: <20190502210922.GF2488@uranus.lan>
References: <1556830342-32307-1-git-send-email-jsavitz@redhat.com>
 <1556830342-32307-2-git-send-email-jsavitz@redhat.com>
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On Thu, May 02, 2019 at 04:52:21PM -0400, Joel Savitz wrote:
>  
> +static int prctl_get_tasksize(void __user * uaddr)
> +{
> +	unsigned long task_size = TASK_SIZE;
> +	return copy_to_user(uaddr, &task_size, sizeof(unsigned long))
> +			? -EFAULT : 0;
> +}

Won't be possible to use put_user here? Something like

static int prctl_get_tasksize(unsigned long __user *uaddr)
{
	return put_user(TASK_SIZE, uaddr) ? -EFAULT : 0;
}