From: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
To: Jann Horn <jannh@google.com>
Cc: mtk.manpages@gmail.com, Tycho Andersen <tycho@tycho.pizza>,
Sargun Dhillon <sargun@sargun.me>,
Kees Cook <keescook@chromium.org>,
Christian Brauner <christian@brauner.io>,
linux-man <linux-man@vger.kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
Aleksa Sarai <cyphar@cyphar.com>,
Alexei Starovoitov <ast@kernel.org>,
Will Drewry <wad@chromium.org>, bpf <bpf@vger.kernel.org>,
Song Liu <songliubraving@fb.com>,
Daniel Borkmann <daniel@iogearbox.net>,
Andy Lutomirski <luto@amacapital.net>,
Linux Containers <containers@lists.linux-foundation.org>,
Giuseppe Scrivano <gscrivan@redhat.com>,
Robert Sesek <rsesek@google.com>
Subject: Re: For review: seccomp_user_notif(2) manual page
Date: Tue, 27 Oct 2020 07:14:03 +0100 [thread overview]
Message-ID: <e2643168-b5d5-4d8c-947a-7895bcabc268@gmail.com> (raw)
In-Reply-To: <CAG48ez2Uy8=Tz9k1hcr0suLPHjbJi1qUviSGzDQ-XWEGsdNU+A@mail.gmail.com>
On 10/26/20 4:54 PM, Jann Horn wrote:
> On Sun, Oct 25, 2020 at 5:32 PM Michael Kerrisk (man-pages)
> <mtk.manpages@gmail.com> wrote:
[...]
>> I tried applying the patch below to vanilla 5.9.0.
>> (There's one typo: s/ENOTCON/ENOTCONN).
>>
>> It seems not to work though; when I send a signal to my test
>> target process that is sleeping waiting for the notification
>> response, the process enters the uninterruptible D state.
>> Any thoughts?
>
> Ah, yeah, I think I was completely misusing the wait API. I'll go change that.
>
> (Btw, in general, for reports about hangs like that, it can be helpful
> to have the contents of /proc/$pid/stack. And for cases where CPUs are
> spinning, the relevant part from the output of the "L" sysrq, or
> something like that.)
Thanks for the tipcs!
> Also, I guess we can probably break this part of UAPI after all, since
> the only user of this interface seems to currently be completely
> broken in this case anyway? So I think we want the other
> implementation without the ->canceled_reqs logic after all.
Okay.
> I'm a bit on the fence now on whether non-blocking mode should use
> ENOTCONN or not... I guess if we returned ENOENT even when there are
> no more listeners, you'd have to disambiguate through the poll()
> revents, which would be kinda ugly?
I must confess, I'm not quite clear on which two cases you
are trying to distinguish. Can you elaborate?
> I'll try to turn this into a proper patch submission...
Thank you!!
Cheers,
Michael
--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
next prev parent reply other threads:[~2020-10-27 6:15 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-30 11:07 For review: seccomp_user_notif(2) manual page Michael Kerrisk (man-pages)
2020-09-30 15:03 ` Tycho Andersen
2020-09-30 15:11 ` Tycho Andersen
2020-09-30 20:34 ` Michael Kerrisk (man-pages)
2020-09-30 23:03 ` Tycho Andersen
2020-09-30 23:11 ` Jann Horn
2020-09-30 23:24 ` Tycho Andersen
2020-10-01 1:52 ` Jann Horn
2020-10-01 2:14 ` Jann Horn
2020-10-25 16:31 ` Michael Kerrisk (man-pages)
2020-10-26 15:54 ` Jann Horn
2020-10-27 6:14 ` Michael Kerrisk (man-pages) [this message]
2020-10-27 10:28 ` Jann Horn
2020-10-28 6:31 ` Sargun Dhillon
2020-10-28 9:43 ` Jann Horn
2020-10-28 17:43 ` Sargun Dhillon
2020-10-28 18:20 ` Jann Horn
2020-10-01 7:49 ` Michael Kerrisk (man-pages)
2020-10-26 0:32 ` Kees Cook
2020-10-26 9:51 ` Jann Horn
2020-10-26 10:31 ` Jann Horn
2020-10-28 22:56 ` Kees Cook
2020-10-29 1:11 ` Jann Horn
[not found] ` <20201029021348.GB25673@cisco>
2020-10-29 4:26 ` Jann Horn
2020-10-28 22:53 ` Kees Cook
2020-10-29 1:25 ` Jann Horn
2020-10-01 7:45 ` Michael Kerrisk (man-pages)
2020-10-14 4:40 ` Michael Kerrisk (man-pages)
2020-09-30 15:53 ` Jann Horn
2020-10-01 12:54 ` Christian Brauner
2020-10-01 15:47 ` Jann Horn
2020-10-01 16:58 ` Tycho Andersen
2020-10-01 17:12 ` Christian Brauner
2020-10-14 5:41 ` Michael Kerrisk (man-pages)
2020-10-01 18:18 ` Jann Horn
2020-10-01 18:56 ` Tycho Andersen
2020-10-01 17:05 ` Christian Brauner
2020-10-15 11:24 ` Michael Kerrisk (man-pages)
2020-10-15 20:32 ` Jann Horn
2020-10-16 18:29 ` Michael Kerrisk (man-pages)
2020-10-17 0:25 ` Jann Horn
2020-10-24 12:52 ` Michael Kerrisk (man-pages)
2020-10-26 9:32 ` Jann Horn
2020-10-26 9:47 ` Michael Kerrisk (man-pages)
2020-09-30 23:39 ` Kees Cook
2020-10-15 11:24 ` Michael Kerrisk (man-pages)
2020-10-26 0:19 ` Kees Cook
2020-10-26 9:39 ` Michael Kerrisk (man-pages)
2020-10-01 12:36 ` Christian Brauner
2020-10-15 11:23 ` Michael Kerrisk (man-pages)
2020-10-01 21:06 ` Sargun Dhillon
2020-10-01 23:19 ` Tycho Andersen
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