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

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: <20080421183451.GA22071@vino.hallyn.com>
Date:	Mon, 21 Apr 2008 13:34:51 -0500
From:	serge@...lyn.com
To:	David R <david@...olicited.net>
Cc:	serge@...lyn.com, 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 David R (david@...olicited.net):
> 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).

Ok, thanks, then it's definately not what I was thinking.

(Will wait to check out your strace)

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