linux-kernel - 2.6.24-rc2-rt1 build failure: mod_unreg

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Message-Id: <200712131918.44236.dvhltc@linux.vnet.ibm.com>
Date:	Thu, 13 Dec 2007 19:18:44 -0800
From:	Darren Hart <dvhltc@...ux.vnet.ibm.com>
To:	"lkml, " <linux-kernel@...r.kernel.org>
Cc:	linux-rt-users@...r.kernel.org
Subject: 2.6.24-rc2-rt1 build failure: mod_unreg_security

security/realcaps.c still uses mod_unreg_security and 
unregister_security to try and unregister the realtime capabilities 
from LSM.  Those functions appear to have been removed from 
security/security.c, so the build fails with:

security/realcap.c: In function ‘realtime_exit’:
security/realcap.c:129: error: implicit declaration of 
function ‘mod_unreg_security’
security/realcap.c:133: error: implicit declaration of 
function ‘unregister_security’
‘mod_unreg_security’ only exists in the one place and in the lsm.tmpl

I compared the security.c of 2.6.23.9-rt12 and it still has the two 
missing functions.  Was there a change in how features are unregistered 
from LSM that was missed for the realcaps.c file perhaps?

I commented out the unreg calls to try and build, it completed, but the 
realcap.ko had several undefined symbols.

Kernel: arch/x86/boot/bzImage is ready  (#1)
ERROR: "cap_netlink_send" [security/realcap.ko] undefined!
ERROR: "cap_task_reparent_to_init" [security/realcap.ko] undefined!
ERROR: "cap_task_post_setuid" [security/realcap.ko] undefined!
ERROR: "cap_bprm_secureexec" [security/realcap.ko] undefined!
ERROR: "cap_bprm_set_security" [security/realcap.ko] undefined!
ERROR: "cap_vm_enough_memory" [security/realcap.ko] undefined!
ERROR: "cap_syslog" [security/realcap.ko] undefined!
ERROR: "cap_capable" [security/realcap.ko] undefined!
ERROR: "cap_capset_set" [security/realcap.ko] undefined!
ERROR: "cap_capset_check" [security/realcap.ko] undefined!
ERROR: "cap_capget" [security/realcap.ko] undefined!
ERROR: "cap_ptrace" [security/realcap.ko] undefined!
ERROR: "cap_bprm_apply_creds" [security/realcap.ko] undefined!
ERROR: "mod_reg_security" [security/realcap.ko] undefined!
ERROR: "register_security" [security/realcap.ko] undefined!
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2

Checking the config I see this is marked as obsolete, so maybe we don't 
care all that much - but if it wasn't just removed, I suspect we still 
want it to build?

Thanks,

-- 
Darren Hart
IBM Linux Technology Center
Real-Time Linux Team
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