linux-kernel - Re: [PATCH v3 1/2] kernel/sys: add PR_GET_TASK

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Message-ID: <20190504065659.GA4156@avx2>
Date:   Sat, 4 May 2019 09:56:59 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Joel Savitz <jsavitz@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Kristina Martsenko <kristina.martsenko@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Kees Cook <keescook@...omium.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Micah Morton <mortonm@...omium.org>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Jann Horn <jannh@...gle.com>,
        Rafael Aquini <aquini@...hat.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Yury Norov <yury.norov@...il.com>,
        David Laight <David.Laight@...lab.com>
Subject: Re: [PATCH v3 1/2] kernel/sys: add PR_GET_TASK_SIZE option to
 prctl(2)

On Fri, May 03, 2019 at 02:10:20PM -0400, Joel Savitz wrote:
> +/* Get the process virtual memory size (i.e. the highest usable VM address) */
> +#define PR_GET_TASK_SIZE               55

TASK_SIZE is in fact the lowest _un_usable address. :^)