linux-kernel - [patch] clone.2: Add EACCES with CLONE_INTO

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Date:   Sun, 29 Aug 2021 15:57:06 -0400
From:   Andrew Wock <ajwock@...il.com>
To:     linux-man@...r.kernel.org, alx.manpages@...il.com,
        mtk.manpages@...il.com
Cc:     christian@...uner.io, linux-kernel@...r.kernel.org
Subject: [patch] clone.2: Add EACCES with CLONE_INTO_CGROUP + clone3 to ERRORS

Resending because it's my first time mailing the lkml and I used html.
Reattempting w/ gmail's plaintext mode.  I apologise if this is
reaching you twice.

I noticed that clone3 can send the EACCES errno after I wrote a
program that used clone3 with the CLONE_INTO_CGROUP flag.  To me, it's
important to know what kind of failure occurred if the clone3 fails,
so I was glad that a unique errno is set for this case, but it wasn't
documented on the clone man page.

I've attached a patch and a test program.

Test program is attached as clone3_doc.c.  Create
/sys/fs/cgroup/not-allowed as root, then run the program.  It should
set errno to EACCES.

Thanks,
Andrew Wock

View attachment "clone3_doc.c" of type "text/plain" (1276 bytes)

Download attachment "clone.2.diff" of type "application/octet-stream" (592 bytes)