linux-kernel - a CGroup issue: a weird value in memory.memsw.limit_in

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>] [day] [month] [year] [list]

Message-ID: <f2fa95b8-4989-ebcf-f609-33ef49dc8acf@gmx.de>
Date:   Mon, 1 Jun 2020 10:04:20 +0200
From:   Toralf Förster <toralf.foerster@....de>
To:     Linux Kernel <linux-kernel@...r.kernel.org>
Subject: a CGroup issue: a weird value in memory.memsw.limit_in_bytes

I do wonder about this value:

# grep ^9 /sys/fs/cgroup/memory/*/*/memory.memsw.limit_in_bytes
/sys/fs/cgroup/memory/tinderbox/17.1_developer-20200531-193248/memory.memsw.limit_in_bytes:9223372036854771712
/sys/fs/cgroup/memory/tinderbox/17.1_developer-libressl-20200531-194547/memory.memsw.limit_in_bytes:9223372036854771712
/sys/fs/cgroup/memory/tinderbox/17.1_hardened-20200531-195425/memory.memsw.limit_in_bytes:9223372036854771712

which are about 2^12 below 2^63 :

# echo "2^63 - 9223372036854771712" | bc
4096

b/c I do write much smaller values into it:

https://github.com/toralf/tinderbox/blob/75fcbe43f58dadfab94fdd67aef1f681bb74f451/bin/bwrap.sh#L34

This happens not always, just realized it yesterday at few files.
--
Toralf