linux-kernel - Re: [RFC PATCH 1/5] signal: Teach sigsuspend to use set_user

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Date:   Wed, 12 Jun 2019 15:35:20 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     "'Eric W. Biederman'" <ebiederm@...ssion.com>,
        'Andrew Morton' <akpm@...ux-foundation.org>,
        'Deepa Dinamani' <deepa.kernel@...il.com>,
        "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
        "'arnd@...db.de'" <arnd@...db.de>,
        "'dbueso@...e.de'" <dbueso@...e.de>,
        "'axboe@...nel.dk'" <axboe@...nel.dk>,
        "'dave@...olabs.net'" <dave@...olabs.net>,
        "'e@...24.org'" <e@...24.org>,
        "'jbaron@...mai.com'" <jbaron@...mai.com>,
        "'linux-fsdevel@...r.kernel.org'" <linux-fsdevel@...r.kernel.org>,
        "'linux-aio@...ck.org'" <linux-aio@...ck.org>,
        "'omar.kilani@...il.com'" <omar.kilani@...il.com>,
        "'tglx@...utronix.de'" <tglx@...utronix.de>,
        'Al Viro' <viro@...IV.linux.org.uk>,
        'Linus Torvalds' <torvalds@...ux-foundation.org>,
        "'linux-arch@...r.kernel.org'" <linux-arch@...r.kernel.org>
Subject: Re: [RFC PATCH 1/5] signal: Teach sigsuspend to use set_user_sigmask

On 06/12, David Laight wrote:
>
> > > If I add a signal handler for SIGINT it is called when pselect()
> > > returns regardless of the return value.
> >
> > That is odd.  Is this with Oleg's fix applied?
>
> No it is a 5.1.0-rc5 kernel with no related local patches.
> So it is the 'historic' behaviour of pselect().

No, this is not historic behaviour,

> But not the original one! Under 2.6.22-5-31 the signal handler isn't caller
> when pselect() returns 1.

This is historic behaviour.

And it was broken by 854a6ed56839a4 ("signal: Add restore_user_sigmask()").

And this is what we already discussed many, many times in this thread ;)

Oleg.