module: Enable dynamic debugging regardless of taint

Dynamic debugging is currently disabled for tainted modules, except
for TAINT_CRAP.  This prevents use of dynamic debugging for
out-of-tree modules once the next patch is applied.

This condition was apparently intended to avoid a crash if a force-
loaded module has an incompatible definition of dynamic debug
structures.  However, a administrator that forces us to load a module
is claiming that it *is* compatible even though it fails our version
checks.  If they are mistaken, there are any number of ways the module
could crash the system.

As a side-effect, proprietary and other tainted modules can now use
dynamic_debug.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 2 insertions, 4 deletions

diff --git a/kernel/module.c b/kernel/module.c
index 93342d992f34..3c5509642847 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2878,8 +2878,7 @@ static struct module *load_module(void __user *umod,
         }
 
         /* This has to be done once we're sure module name is unique. */
-        if (!mod->taints || mod->taints == (1U<<TAINT_CRAP))
-                dynamic_debug_setup(info.debug, info.num_debug);
+        dynamic_debug_setup(info.debug, info.num_debug);
 
         /* Find duplicate symbols */
         err = verify_export_symbols(mod);
@@ -2915,8 +2914,7 @@ static struct module *load_module(void __user *umod,
         module_bug_cleanup(mod);
 
  ddebug:
-        if (!mod->taints || mod->taints == (1U<<TAINT_CRAP))
-                dynamic_debug_remove(info.debug);
+        dynamic_debug_remove(info.debug);
  unlock:
         mutex_unlock(&module_mutex);
         synchronize_sched();