linux-kernel - Re: [PATCH v2] signal: Adjust error codes according to restore_user

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Message-ID: <CABeXuvqx9fZGiGSAQEE=7wechoGE0E8YW7icBWoTtXPkWPROUw@mail.gmail.com>
Date:   Fri, 24 May 2019 07:29:13 -0700
From:   Deepa Dinamani <deepa.kernel@...il.com>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     David Laight <David.Laight@...lab.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        "dbueso@...e.de" <dbueso@...e.de>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        Davidlohr Bueso <dave@...olabs.net>, Eric Wong <e@...24.org>,
        Jason Baron <jbaron@...mai.com>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        linux-aio <linux-aio@...ck.org>,
        Omar Kilani <omar.kilani@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v2] signal: Adjust error codes according to restore_user_sigmask()

I think you are misunderstanding what I said. You are taking things
out of context. I was saying here what I did was inspired by why the
syscall was designed to begin with. The syscall below refers to
epoll_wait and not epoll_pwait.

-Deepa

On Fri, May 24, 2019 at 7:19 AM Oleg Nesterov <oleg@...hat.com> wrote:
>
> On 05/23, Deepa Dinamani wrote:
> >
> > 1. block the signals you don't care about.
> > 2. syscall()
> > 3. unblock the signals blocked in 1.
>
> and even this part of your email is very confusing. because in this case
> we can never miss a signal. I'd say
>
>         1. block the signals you don't care about
>         2. unblock the signals which should interrupt the syscall below
>         3. syscall()
>         4. block the signals unblocked in 2.
>
> Oleg.
>