svn commit: r235621 - in stable/8/sys: i386/conf kern

[John Baldwin]

Author: jhb
Date: Fri May 18 18:53:28 2012
New Revision: 235621
URL: http://svn.freebsd.org/changeset/base/235621

Log:
  MFC 234186
  If a linker file contains at least one module, but all of the modules
  fail to load (the MOD_LOAD event fails) during a kldload(2), unload the
  linker file and fail the kldload(2) with ENOEXEC.

Modified:
  stable/8/sys/kern/kern_linker.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/boot/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/e1000/   (props changed)
  stable/8/sys/i386/conf/XENHVM   (props changed)

Modified: stable/8/sys/kern/kern_linker.c
==============================================================================
--- stable/8/sys/kern/kern_linker.c	Fri May 18 18:51:13 2012	(r235620)
+++ stable/8/sys/kern/kern_linker.c	Fri May 18 18:53:28 2012	(r235621)
@@ -376,7 +376,7 @@ linker_load_file(const char *filename, l
 {
 	linker_class_t lc;
 	linker_file_t lf;
-	int foundfile, error;
+	int foundfile, error, modules;
 
 	/* Refuse to load modules if securelevel raised */
 	if (prison0.pr_securelevel > 0)
@@ -415,11 +415,22 @@ linker_load_file(const char *filename, l
 				linker_file_unload(lf, LINKER_UNLOAD_FORCE);
 				return (error);
 			}
+			modules = !TAILQ_EMPTY(&lf->modules);
 			KLD_UNLOCK();
 			linker_file_register_sysctls(lf);
 			linker_file_sysinit(lf);
 			KLD_LOCK();
 			lf->flags |= LINKER_FILE_LINKED;
+
+			/*
+			 * If all of the modules in this file failed
+			 * to load, unload the file and return an
+			 * error of ENOEXEC.
+			 */
+			if (modules && TAILQ_EMPTY(&lf->modules)) {
+				linker_file_unload(lf, LINKER_UNLOAD_FORCE);
+				return (ENOEXEC);
+			}
 			*result = lf;
 			return (0);
 		}
@@ -623,7 +634,7 @@ linker_file_unload(linker_file_t file, i
 
 	/*
 	 * Inform any modules associated with this file that they are
-	 * being be unloaded.
+	 * being unloaded.
 	 */
 	MOD_XLOCK;
 	for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {