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

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Date:	Sun, 20 Apr 2008 15:21:57 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David <david@...olicited.net>
Cc:	efault@....de, linux-kernel@...r.kernel.org,
	"Andrew G. Morgan" <morgan@...nel.org>,
	linux-security-module@...r.kernel.org,
	"Serge E. Hallyn" <serue@...ibm.com>
Subject: Re: 2.6.25 Kernel - Problems with capabilities

(cc's added)


> On Sun, 20 Apr 2008 15:09:11 +0100 David <david@...olicited.net> wrote:
> Mike Galbraith wrote:
> > On Sat, 2008-04-19 at 19:43 +0100, David wrote:
> >   
> >> I'm wondering if anyone might be able to help with a capability problem 
> >> I've noticed with .25 My ntp daemon will no longer run as any non-root 
> >> user, and after some investigation it seems that calls to prctl() are 
> >> failing.
> >>
> >> CONFIG_SECURITY_CAPABILITIES=y , so this should work?
> >>
> >> System is 32 bit x86 based on a venerable SuSE 9.1 distro.
> >>
> >> Full .config is attached.
> >>
> >> Thanks
> >> David
> >>
> >>
> >>     
> >
> > FWIW, ntpd runs just fine here as user ntp on both my P4 and Q6600 boxen
> > with opensuse 10.3.
> >
> > marge:..tmp/linux-2.6.25 # grep SECUR .config
> > CONFIG_EXT2_FS_SECURITY=y
> > CONFIG_EXT3_FS_SECURITY=y
> > CONFIG_EXT4DEV_FS_SECURITY=y
> > CONFIG_SECURITY=y
> > CONFIG_SECURITY_NETWORK=y
> > CONFIG_SECURITY_NETWORK_XFRM=y
> > CONFIG_SECURITY_CAPABILITIES=y
> > CONFIG_SECURITY_FILE_CAPABILITIES=y
> > CONFIG_SECURITY_DEFAULT_MMAP_MIN_ADDR=0
> > # CONFIG_SECURITY_SELINUX is not set
> > marge:..tmp/linux-2.6.25 # grep SECUR /xx
> > CONFIG_EXT2_FS_SECURITY=y
> > CONFIG_EXT3_FS_SECURITY=y
> > CONFIG_REISERFS_FS_SECURITY=y
> > # CONFIG_XFS_SECURITY is not set
> > CONFIG_SECURITY=y
> > CONFIG_SECURITY_NETWORK=y
> > # CONFIG_SECURITY_NETWORK_XFRM is not set
> > CONFIG_SECURITY_CAPABILITIES=y
> > # CONFIG_SECURITY_FILE_CAPABILITIES is not set
> > # CONFIG_SECURITY_ROOTPLUG is not set
> > CONFIG_SECURITY_DEFAULT_MMAP_MIN_ADDR=0
> >
> > I notice I have CONFIG_SECURITY_FILE_CAPABILITIES set, and you don't.  I
> > have not even the foggiest clue whether that has anything to do with the
> > price of tea in china though :)
> >   
> I've just set
> 
> CONFIG_SECURITY_FILE_CAPABILITIES=y
> CONFIG_SECURITY_NETWORK_XFRM=y
> 
> to no avail.. I still get
> 
> 
> 20 Apr 15:04:20 ntpd[15694]: cap_set_proc() failed to drop root 
> privileges: Invalid argument
> 
> after rebuild & reboot. No massive deal, I'll just run ntpd as root for 
> now, but there's definitely something funny going on.
> 
> Cheers
> David

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