Re: [PATCH] fs/proc: Expose RSEQ configuration

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To: Piotr Figiel <figiel@xxxxxxxxxx>
Subject: Re: [PATCH] fs/proc: Expose RSEQ configuration
From: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Date: Thu, 14 Jan 2021 00:32:30 +0300
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Alexey Gladkov <gladkov.alexey@xxxxxxxxx>, Christian Brauner <christian.brauner@xxxxxxxxxx>, Michel Lespinasse <walken@xxxxxxxxxx>, Bernd Edlinger <bernd.edlinger@xxxxxxxxxx>, Andrei Vagin <avagin@xxxxxxxxx>, mathieu.desnoyers@xxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, posk@xxxxxxxxxx, kyurtsever@xxxxxxxxxx, ckennelly@xxxxxxxxxx, pjt@xxxxxxxxxx
In-reply-to: <20210113174127.2500051-1-figiel@google.com>

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)

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