linux-kernel - Re: [RFC PATCH 2/4] rseq: Fix: Unregister rseq for CLONE

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Message-ID: <248314994.16.1568161861658.JavaMail.zimbra@efficios.com>
Date:   Tue, 10 Sep 2019 20:31:01 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Paul Turner <pjt@...gle.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        paulmck <paulmck@...ux.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        linux-api <linux-api@...r.kernel.org>
Subject: Re: [RFC PATCH 2/4] rseq: Fix: Unregister rseq for CLONE_TLS

Of course, this patch title should read:

  rseq: Fix: Unregister rseq for CLONE_SETTLS

----- On Sep 11, 2019, at 1:27 AM, Mathieu Desnoyers mathieu.desnoyers@...icios.com wrote:

 
> /*
>  * If parent process has a registered restartable sequences area, the
> - * child inherits. Only applies when forking a process, not a thread.
> + * child inherits. Unregister rseq for a clone with CLONE_TLS set.

and here CLONE_SETTLS as well.

>  */
> static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
> {
> -	if (clone_flags & CLONE_THREAD) {
> +	if (clone_flags & CLONE_TLS) {

.. and here.

Thanks,

Mathieu

> 		t->rseq = NULL;
> 		t->rseq_sig = 0;
> 		t->rseq_event_mask = 0;
> --
> 2.17.1

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com