linux-kernel - Re: 2.6.25 Kernel - Problems with capabilities

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Message-ID: <20080421080101.htzh4s03snescog4@unsolicited.net>
Date:	Mon, 21 Apr 2008 08:01:01 +0100
From:	David R <david@...olicited.net>
To:	serge@...lyn.com
Cc:	casey@...aufler-ca.com, Mike Galbraith <efault@....de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morgan <morgan@...nel.org>
Subject: Re: 2.6.25 Kernel - Problems with capabilities

Quoting serge@...lyn.com:

> Quoting David (david@...olicited.net):
>> Casey Schaufler wrote:
>>> Do you have a libcap that reflects the change from 32 capabilities
>>> to 64? You'll be looking for libcap.so.2.06 or thereabouts.
>>>
>> Adding libcap-2.08 and recompiling ntpd has fixed the issue, and I'm now
>> running normally, thanks!
>
> I don't understand why, though.  Looking at the ntpd code (ntp-4.2.4p4)
> it just does a cap_set_proc(cap_from_text("X=epi"));  It should simply
> be sending in the _LINUX_CAPABILITY_VERSION which shipped with libcap,
> which should have been _V1, and the kernel should honor that so long as
> you didn't try to send in caps > 31, which ntpd wasn't.
>
>> Was this userspace visible change planned in advance for 2.6.25 ? ... as I
>> guess a few other people with venerable old userspace components may come
>> across this issue.
>>
>> Cheers
>> David
>
> It's been in the works a long time and we thought we'd done pretty
> well with backward compatibility.  I really don't see why you had
> that failure!
>
> Do you know which version of libcap you had before?

/lib/libcap.so.1 -> libcap.so.1.92

I guess that's 1.92 (should be the version shipped with SuSE 9.1).

Cheers
David

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