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

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Date:	Mon, 21 Apr 2008 14:01:43 -0500
From:	serge@...lyn.com
To:	David <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 (david@...olicited.net):
> serge@...lyn.com wrote:
>>>
>>> /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)
>>   
> strace attached.
>
> Cheers
> David
>

...
> capget(0x20071026, 0, {, , })           = -1 EINVAL (Invalid argument)

This is odd.  libcap-1.x should be passing in 0x19980330.

Next, given the -EINVAL return value ntpd should be seeing a NULL result
from cap_get_proc() and exiting right there.

What version of ntpd is this?  (I must be looking at a wrong value, but
even so the fact that cap_get_proc()->capget() is using 0x20071026 for
version doesn't make sense)

> capset(0, 0, {CAP_NET_BIND_SERVICE|CAP_SYS_TIME, CAP_NET_BIND_SERVICE|CAP_SYS_TIME, CAP_NET_BIND_SERVICE|CAP_SYS_TIME}) = -1 EINVAL (Invalid argument)
> time(NULL)                              = 1208803493
> write(5, "21 Apr 19:44:53 ntpd[6118]: cap_"..., 92) = 92
> munmap(0x40022000, 4096)                = 0
> exit_group(-1)                          = ?
> Process 6118 detached


thanks,
-serge
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