linux-kernel - Re: [PATCH v4] signal: add taskfd_send

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 06 Dec 2018 14:44:36 +0100
From:   Florian Weimer <fweimer@...hat.com>
To:     ebiederm@...ssion.com (Eric W. Biederman)
Cc:     Jürg Billeter <j@...ron.ch>,
        Christian Brauner <christian@...uner.io>,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        luto@...nel.org, arnd@...db.de, serge@...lyn.com, jannh@...gle.com,
        akpm@...ux-foundation.org, oleg@...hat.com, cyphar@...har.com,
        viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
        dancol@...gle.com, timmurray@...gle.com, linux-man@...r.kernel.org,
        keescook@...omium.org, tglx@...utronix.de, x86@...nel.org
Subject: Re: [PATCH v4] signal: add taskfd_send_signal() syscall

* Eric W. Biederman:

> Floriam are you seeing a problem with this behavior or the way Christian
> was describing it?

My hope is that you could use taskfd_send_signal one day to send a
signal to a process which you *known* (based on how you've written your
application) should be running and not in a zombie state, and get back
an error if it has exited.

If you get this error, only then you wait on the process, using the file
descriptor you have, and run some recovery code.

Wouldn't that be a reasonable approach once we've got task descriptors?

Thanks,
Florian