lkml.org 
[lkml]   [2007]   [Sep]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: sys_chroot+sys_fchdir Fix
Theodore Tso wrote:
> On Thu, Sep 27, 2007 at 09:28:08AM +0200, Christer Weinigel wrote:
>
>> So the OpenBSD man page seems to be in the minority here. Any portable
>> code can not assume that CWD changes. And changing the Linux behaviour
>> now would be a rather big change which might break userspace. And yes,
>> there are applications that rely on this, I've used it when building
>> software for cross compiling.
>>
>
> Changing Linux behavior would violate the POSIX and SuSV2
> specifications; the standards explicitly state that the working
> directory will NOT change. And standards adherance is important; we
> break them only if we have a d*mn good reason. And trying to make
> chroot() something which it is not (i.e., a secure jail) is certainly
> not a good enough reason.
>
> Can we please end this thread now? And can we put in a Kernel FAQ
> saying that this is not something which is NOT up for discussion?
>
It seems there are (at least) two parts to this, one regarding changing
working directory which is clearly stated in the standards and must work
as it does, and the various issues regarding getting out of the chroot
after the cwd has entered that changed root. That second part seems to
offer room for additional controls on getting out of the chroot which do
not violate any of the obvious standards, and which therefore might be
valid candidates for discussion on the basis of benefit rather than
portability.

--
bill davidsen <davidsen@tmr.com>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-09-27 16:35    [W:0.059 / U:2.744 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site