PERFORCE change 156451 for review

[Robert Watson]

http://perforce.freebsd.org/chv.cgi?CH=156451

Change 156451 by rwatson at rwatson_freebsd_capabilities on 2009/01/20 23:32:12

	If a capability-mode process manages to get into namei(),
	print a stack trace if KDB is compiled into the kernel.

Affected files ...

.. //depot/projects/trustedbsd/capabilities/src/sys/kern/vfs_lookup.c#6 edit

Differences ...

==== //depot/projects/trustedbsd/capabilities/src/sys/kern/vfs_lookup.c#6 (text+ko) ====

@@ -37,6 +37,7 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD: src/sys/kern/vfs_lookup.c,v 1.117 2008/12/18 11:58:12 kib Exp $");
 
+#include "opt_kdb.h"
 #include "opt_ktrace.h"
 #include "opt_mac.h"
 
@@ -54,6 +55,9 @@
 #include <sys/proc.h>
 #include <sys/syscallsubr.h>
 #include <sys/sysctl.h>
+#ifdef KDB
+#include <sys/kdb.h>
+#endif
 #ifdef KTRACE
 #include <sys/ktrace.h>
 #endif
@@ -128,6 +132,14 @@
 	struct proc *p = td->td_proc;
 	int vfslocked;
 
+#ifdef KDB
+	if (td->td_ucred->cr_flags & CRED_FLAG_CAPMODE) {
+		printf("namei: pid %d proc %s performed namei in capability "
+		    "mode\n", p->p_pid, p->p_comm);
+		kdb_backtrace();
+	}
+#endif
+
 	KASSERT((cnp->cn_flags & MPSAFE) != 0 || mtx_owned(&Giant) != 0,
 	    ("NOT MPSAFE and Giant not held"));
 	ndp->ni_cnd.cn_cred = ndp->ni_cnd.cn_thread->td_ucred;