netdev - Re: [PATCH] LSM: Add post recvmsg() hook.

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]

Message-Id: <20100723.002913.264776153.davem@davemloft.net>
Date:	Fri, 23 Jul 2010 00:29:13 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	penguin-kernel@...ove.SAKURA.ne.jp
Cc:	kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, paul.moore@...com,
	netdev@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH] LSM: Add post recvmsg() hook.

From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Date: Fri, 23 Jul 2010 16:21:38 +0900

> Users calling recvmsg() after select() said "read operation will return with
> available data without blocking as long as you pass correct parameters" will
> get error code even if they passed correct parameters.

This is nonsense, because not all "parameters" are not visible to poll().

These "parameters" I speak of are virtual, they are my way of saying
that the errors returned by the existing LSM hooks are more like -EFAULT
or -EACCESS than -EINTR/-EAGAIN or blocking, the latter of which are
what are illegal for blocking socket invoking recvmsg() after poll
indicates there is data to read.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html