How might this affect the Fedora kernel?
---------- Forwarded message ----------
Date: Tue, 10 Nov 2009 08:07:39 -0600
From: Serge E. Hallyn <serue(a)us.ibm.com>
To: lkml <linux-kernel(a)vger.kernel.org>
Cc: linux-security-module(a)vger.kernel.org, Andrew Morgan <morgan(a)kernel.org>,
Steve Grubb <sgrubb(a)redhat.com>, Kees Cook <kees.cook(a)canonical.com>,
Andreas Gruenbacher <agruen(a)suse.de>,
Michael Kerrisk <mtk.manpages(a)gmail.com>,
George Wilson <gcwilson(a)us.ibm.com>
Subject: drop SECURITY_FILE_CAPABILITIES?
Just a probe to see what people think. I've seen two cases
in about the last month where software was confounded by
an assumption that prctl(PR_CAPBSET_DROP, CAP_SOMETHING)
would succeed if privileged, but not handling the fact
that SECURITY_FILE_CAPABILITIES=n means you can't do that.
Are we at the point yet where we feel we can get rid of
the SECURITY_FILE_CAPABILITIES=n case?
Note that there is a boot arg no_file_caps which prevents
file capabilities from being used if SECURITY_FILE_CAPABILITIES=y.
I think that's the case most users will care about, whereas the
remaining differences between CONFIG_SECURITY_FILE_CAPABILITIES=y
and =n are that with CONFIG_SECURITY_FILE_CAPABILITIES=y :
(1) certain security hooks (task_setscheduler, task_setioprio, and
task_setnice) do capability set comparisions,
(2) it is possible to drop capabilities from the bounding set,
(3) it is possible to set per-task securelevels,
(4) and it is possible to add any capability to your inheritable
set if you have CAP_SETPCAP.
Does anyone know of cases where CONFIG_SECURITY_FILE_CAPABILITIES=n
is still perceived as useful?
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I have a 2.6.31 kernel from F12.
I believe I've built it with CONFIG_PREEMPT but given the intracacies of
the rpm build, what's the easiest way to check an installed kernel to
see if that flag had been used during build?