linux-kernel - Re: [PATCH 1/2] alpha/ptrace: Record and handle the absence of switch

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Message-ID: <YMpm2c2mHc/Lldhy@zeniv-ca.linux.org.uk>
Date:   Wed, 16 Jun 2021 21:02:17 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Michael Schmitz <schmitzmic@...il.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>, Oleg Nesterov <oleg@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        alpha <linux-alpha@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Ley Foon Tan <ley.foon.tan@...el.com>,
        Tejun Heo <tj@...nel.org>, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 1/2] alpha/ptrace: Record and handle the absence of
 switch_stack

On Wed, Jun 16, 2021 at 03:57:19PM -0500, Eric W. Biederman wrote:
 
> Do you know if struct switch_stack or pt_regs is ever exposeed to
> usespace?  They are both defined in arch/alpha/include/uapi/asm/ptrace.h
> which makes me think userspace must see those definitions somewhere.

	They are exposed, but why mess with those in the first
place?  thread_info->status is strictly thread-synchronous, so just
use it and be done with that...