linux-kernel - Re: [PATCH] fs/proc: Expose RSEQ configuration

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Message-ID: <20210113213230.GA488607@localhost.localdomain>
Date:   Thu, 14 Jan 2021 00:32:30 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Piotr Figiel <figiel@...gle.com>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Alexey Gladkov <gladkov.alexey@...il.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Michel Lespinasse <walken@...gle.com>,
        Bernd Edlinger <bernd.edlinger@...mail.de>,
        Andrei Vagin <avagin@...il.com>,
        mathieu.desnoyers@...icios.com, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, posk@...gle.com,
        kyurtsever@...gle.com, ckennelly@...gle.com, pjt@...gle.com
Subject: Re: [PATCH] fs/proc: Expose RSEQ configuration

On Wed, Jan 13, 2021 at 06:41:27PM +0100, Piotr Figiel wrote:
> For userspace checkpoint and restore (C/R) some way of getting process
> state containing RSEQ configuration is needed.

> +	seq_printf(m, "0x%llx 0x%x\n", (uint64_t)task->rseq, task->rseq_sig);

%llx is too much on 32-bit. "%tx %x" is better (or even %08x)