linux-kernel - Re: [PATCH 2/2] alpha/ptrace: Add missing switch

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Date:   Wed, 16 Jun 2021 20:55:49 +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 2/2] alpha/ptrace: Add missing switch_stack frames

On Wed, Jun 16, 2021 at 03:47:28PM -0500, Eric W. Biederman wrote:

> Fork already saves the registers, all I did was restore them.  Which
> makes a debugger that modifies them in
> PTRACE_EVENT_{FORK,VFORK,CLONE,VFORK_DONE} work.

... first time ever.  Wonderful and well worth the overhead.
</sarcasm>