linux-kernel - Re: [PATCH] pipe: limit the per-user amount of pages allocated in pipes

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

Message-Id: <201601102340.GEG57385.VSJFMFHOLQOFtO@I-love.SAKURA.ne.jp>
Date:	Sun, 10 Jan 2016 23:40:30 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	w@....eu
Cc:	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	socketpair@...il.com
Subject: Re: [PATCH] pipe: limit the per-user amount of pages allocated in pipes

Willy Tarreau wrote:
> In a shared environment, limiting to 256
> processes and 1024 FDs per process, you end up with "only" 1 GB of RAM which
> is more reasonable a on large shared system.

OK. I see no problems if we change example to something like

  With a user enforcing the FD limit to 262144, this results in
  1024 * 64kB + (26214464 - 1024) * 4kB = 1084MB.