Subject: Re: systrace and non-existent files
To: None <tech-kern@netbsd.org>
From: Christos Zoulas <christos@astron.com>
List: tech-kern
Date: 05/16/2007 15:44:24
In article <x64pmdt0yt.fsf@aix.iws.cs.uni-magdeburg.de>,
Michael Piotrowski  <mxp@dynalabs.de> wrote:
>Hi,
>
>Last week my hard disk crashed and in the course of recovery I updated
>from NetBSD 3.0.1 to 3.1.
>
>I use systrace quite a lot (for running students' programming
>assignments), and after the update I noticed that some interpreters are
>now being killed by systrace and that for others lots of "deny" messages
>are being logged--while it had worked fine before.  I quickly noticed
>that this was related to the handling of non-existent filenames.  While
>before rules like
>
>  netbsd-fsread: filename match "/<non-existent filename>: *" then deny[enoent]
>
>worked, they no longer match.
>
>It seems that this is the same issue as described in PR 32360 ("recent
>changes breaks systrace fswrite").  Browsing CVS, I found that this
>problem was fixed in revision 1.36.2.2 of getcwd.c, but in revision
>1.36.2.3, which is used in NetBSD 3.1, exactly this change was removed.
>
>Being unable to handle non-existent filenames correctly severely limits
>the usefulness of systrace for me.
>
>Does anybody know whether this problem will be fixed in the next
>release? Or are there any recommendations for what I could do?
>
>Thanks and greetings

Please send-pr this message so that it does not get lost and we'll pull
up the fix. In the meantime you can do this yourself, by applying the
fix and building a new kernel.

christos