[patch 5/7] BSD Secure Levels: allow setuid/setgid on root user processes

[Michael Halcrow <mhalcrow@us.ibm.com>]

This is the fifth in a series of seven patches to the BSD Secure
Levels LSM.  It allows setuid and setgid on a process if the user is
already root.  This allows non-root users to log in.  Thanks to Serge
Hallyn for the suggestion.

Signed off by: Michael Halcrow <mhalcrow@us.ibm.com>

Index: linux-2.6.12-rc4-mm2-seclvl/security/seclvl.c
===================================================================
--- linux-2.6.12-rc4-mm2-seclvl.orig/security/seclvl.c	2005-05-16 16:28:29.000000000 -0500
+++ linux-2.6.12-rc4-mm2-seclvl/security/seclvl.c	2005-05-16 16:29:19.000000000 -0500
@@ -442,12 +442,12 @@
 				      "in secure level [%d] denied\n",
 				      __FUNCTION__, seclvl);
 			return -EPERM;
-		} else if (cap == CAP_SETUID) {
+		} else if (cap == CAP_SETUID && current->uid != 0) {
 			seclvl_printk(1, KERN_WARNING "%s: Attempt to setuid "
 				      "while in secure level [%d] denied\n",
 				      __FUNCTION__, seclvl);
 			return -EPERM;
-		} else if (cap == CAP_SETGID) {
+		} else if (cap == CAP_SETGID && current->uid != 0) {
 			seclvl_printk(1, KERN_WARNING "%s: Attempt to setgid "
 				      "while in secure level [%d] denied\n",
 				      __FUNCTION__, seclvl);