1 files changed, 138 insertions, 113 deletions

diff --git a/kernel/module.c b/kernel/module.c
index e52a873..d856e96 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -42,7 +42,6 @@
 #include <linux/vermagic.h>
 #include <linux/notifier.h>
 #include <linux/sched.h>
-#include <linux/stop_machine.h>
 #include <linux/device.h>
 #include <linux/string.h>
 #include <linux/mutex.h>
@@ -98,7 +97,7 @@
  * 1) List of modules (also safely readable with preempt_disable),
  * 2) module_use links,
  * 3) module_addr_min/module_addr_max.
- * (delete uses stop_machine/add uses RCU list operations). */
+ * (delete and add uses RCU list operations). */
 DEFINE_MUTEX(module_mutex);
 EXPORT_SYMBOL_GPL(module_mutex);
 static LIST_HEAD(modules);
@@ -158,13 +157,13 @@ static BLOCKING_NOTIFIER_HEAD(module_notify_list);
  * Protected by module_mutex. */
 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
 
-int register_module_notifier(struct notifier_block * nb)
+int register_module_notifier(struct notifier_block *nb)
 {
 	return blocking_notifier_chain_register(&module_notify_list, nb);
 }
 EXPORT_SYMBOL(register_module_notifier);
 
-int unregister_module_notifier(struct notifier_block * nb)
+int unregister_module_notifier(struct notifier_block *nb)
 {
 	return blocking_notifier_chain_unregister(&module_notify_list, nb);
 }
@@ -628,18 +627,23 @@ static char last_unloaded_module[MODULE_NAME_LEN+1];
 
 EXPORT_TRACEPOINT_SYMBOL(module_get);
 
+/* MODULE_REF_BASE is the base reference count by kmodule loader. */
+#define MODULE_REF_BASE	1
+
 /* Init the unload section of the module. */
 static int module_unload_init(struct module *mod)
 {
-	mod->refptr = alloc_percpu(struct module_ref);
-	if (!mod->refptr)
-		return -ENOMEM;
+	/*
+	 * Initialize reference counter to MODULE_REF_BASE.
+	 * refcnt == 0 means module is going.
+	 */
+	atomic_set(&mod->refcnt, MODULE_REF_BASE);
 
 	INIT_LIST_HEAD(&mod->source_list);
 	INIT_LIST_HEAD(&mod->target_list);
 
 	/* Hold reference count during initialization. */
-	raw_cpu_write(mod->refptr->incs, 1);
+	atomic_inc(&mod->refcnt);
 
 	return 0;
 }
@@ -721,8 +725,6 @@ static void module_unload_free(struct module *mod)
 		kfree(use);
 	}
 	mutex_unlock(&module_mutex);
-
-	free_percpu(mod->refptr);
 }
 
 #ifdef CONFIG_MODULE_FORCE_UNLOAD
@@ -740,60 +742,48 @@ static inline int try_force_unload(unsigned int flags)
 }
 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
 
-struct stopref
+/* Try to release refcount of module, 0 means success. */
+static int try_release_module_ref(struct module *mod)
 {
-	struct module *mod;
-	int flags;
-	int *forced;
-};
+	int ret;
 
-/* Whole machine is stopped with interrupts off when this runs. */
-static int __try_stop_module(void *_sref)
-{
-	struct stopref *sref = _sref;
+	/* Try to decrement refcnt which we set at loading */
+	ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt);
+	BUG_ON(ret < 0);
+	if (ret)
+		/* Someone can put this right now, recover with checking */
+		ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0);
 
+	return ret;
+}
+
+static int try_stop_module(struct module *mod, int flags, int *forced)
+{
 	/* If it's not unused, quit unless we're forcing. */
-	if (module_refcount(sref->mod) != 0) {
-		if (!(*sref->forced = try_force_unload(sref->flags)))
+	if (try_release_module_ref(mod) != 0) {
+		*forced = try_force_unload(flags);
+		if (!(*forced))
 			return -EWOULDBLOCK;
 	}
 
 	/* Mark it as dying. */
-	sref->mod->state = MODULE_STATE_GOING;
-	return 0;
-}
-
-static int try_stop_module(struct module *mod, int flags, int *forced)
-{
-	struct stopref sref = { mod, flags, forced };
+	mod->state = MODULE_STATE_GOING;
 
-	return stop_machine(__try_stop_module, &sref, NULL);
+	return 0;
 }
 
-unsigned long module_refcount(struct module *mod)
+/**
+ * module_refcount - return the refcount or -1 if unloading
+ *
+ * @mod:	the module we're checking
+ *
+ * Returns:
+ *	-1 if the module is in the process of unloading
+ *	otherwise the number of references in the kernel to the module
+ */
+int module_refcount(struct module *mod)
 {
-	unsigned long incs = 0, decs = 0;
-	int cpu;
-
-	for_each_possible_cpu(cpu)
-		decs += per_cpu_ptr(mod->refptr, cpu)->decs;
-	/*
-	 * ensure the incs are added up after the decs.
-	 * module_put ensures incs are visible before decs with smp_wmb.
-	 *
-	 * This 2-count scheme avoids the situation where the refcount
-	 * for CPU0 is read, then CPU0 increments the module refcount,
-	 * then CPU1 drops that refcount, then the refcount for CPU1 is
-	 * read. We would record a decrement but not its corresponding
-	 * increment so we would see a low count (disaster).
-	 *
-	 * Rare situation? But module_refcount can be preempted, and we
-	 * might be tallying up 4096+ CPUs. So it is not impossible.
-	 */
-	smp_rmb();
-	for_each_possible_cpu(cpu)
-		incs += per_cpu_ptr(mod->refptr, cpu)->incs;
-	return incs - decs;
+	return atomic_read(&mod->refcnt) - MODULE_REF_BASE;
 }
 EXPORT_SYMBOL(module_refcount);
 
@@ -875,10 +865,12 @@ static inline void print_unload_info(struct seq_file *m, struct module *mod)
 	struct module_use *use;
 	int printed_something = 0;
 
-	seq_printf(m, " %lu ", module_refcount(mod));
+	seq_printf(m, " %i ", module_refcount(mod));
 
-	/* Always include a trailing , so userspace can differentiate
-           between this and the old multi-field proc format. */
+	/*
+	 * Always include a trailing , so userspace can differentiate
+	 * between this and the old multi-field proc format.
+	 */
 	list_for_each_entry(use, &mod->source_list, source_list) {
 		printed_something = 1;
 		seq_printf(m, "%s,", use->source->name);
@@ -886,11 +878,11 @@ static inline void print_unload_info(struct seq_file *m, struct module *mod)
 
 	if (mod->init != NULL && mod->exit == NULL) {
 		printed_something = 1;
-		seq_printf(m, "[permanent],");
+		seq_puts(m, "[permanent],");
 	}
 
 	if (!printed_something)
-		seq_printf(m, "-");
+		seq_puts(m, "-");
 }
 
 void __symbol_put(const char *symbol)
@@ -925,7 +917,7 @@ EXPORT_SYMBOL_GPL(symbol_put_addr);
 static ssize_t show_refcnt(struct module_attribute *mattr,
 			   struct module_kobject *mk, char *buffer)
 {
-	return sprintf(buffer, "%lu\n", module_refcount(mk->mod));
+	return sprintf(buffer, "%i\n", module_refcount(mk->mod));
 }
 
 static struct module_attribute modinfo_refcnt =
@@ -935,7 +927,7 @@ void __module_get(struct module *module)
 {
 	if (module) {
 		preempt_disable();
-		__this_cpu_inc(module->refptr->incs);
+		atomic_inc(&module->refcnt);
 		trace_module_get(module, _RET_IP_);
 		preempt_enable();
 	}
@@ -948,11 +940,11 @@ bool try_module_get(struct module *module)
 
 	if (module) {
 		preempt_disable();
-
-		if (likely(module_is_live(module))) {
-			__this_cpu_inc(module->refptr->incs);
+		/* Note: here, we can fail to get a reference */
+		if (likely(module_is_live(module) &&
+			   atomic_inc_not_zero(&module->refcnt) != 0))
 			trace_module_get(module, _RET_IP_);
-		} else
+		else
 			ret = false;
 
 		preempt_enable();
@@ -963,11 +955,12 @@ EXPORT_SYMBOL(try_module_get);
 
 void module_put(struct module *module)
 {
+	int ret;
+
 	if (module) {
 		preempt_disable();
-		smp_wmb(); /* see comment in module_refcount */
-		__this_cpu_inc(module->refptr->decs);
-
+		ret = atomic_dec_if_positive(&module->refcnt);
+		WARN_ON(ret < 0);	/* Failed to put refcount */
 		trace_module_put(module, _RET_IP_);
 		preempt_enable();
 	}
@@ -978,7 +971,7 @@ EXPORT_SYMBOL(module_put);
 static inline void print_unload_info(struct seq_file *m, struct module *mod)
 {
 	/* We don't know the usage count, or what modules are using. */
-	seq_printf(m, " - -");
+	seq_puts(m, " - -");
 }
 
 static inline void module_unload_free(struct module *mod)
@@ -1131,7 +1124,7 @@ static unsigned long maybe_relocated(unsigned long crc,
 static int check_version(Elf_Shdr *sechdrs,
 			 unsigned int versindex,
 			 const char *symname,
-			 struct module *mod, 
+			 struct module *mod,
 			 const unsigned long *crc,
 			 const struct module *crc_owner)
 {
@@ -1165,7 +1158,7 @@ static int check_version(Elf_Shdr *sechdrs,
 	return 0;
 
 bad_version:
-	printk("%s: disagrees about version of symbol %s\n",
+	pr_warn("%s: disagrees about version of symbol %s\n",
 	       mod->name, symname);
 	return 0;
 }
@@ -1200,7 +1193,7 @@ static inline int same_magic(const char *amagic, const char *bmagic,
 static inline int check_version(Elf_Shdr *sechdrs,
 				unsigned int versindex,
 				const char *symname,
-				struct module *mod, 
+				struct module *mod,
 				const unsigned long *crc,
 				const struct module *crc_owner)
 {
@@ -1288,15 +1281,13 @@ static inline bool sect_empty(const Elf_Shdr *sect)
 	return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
 }
 
-struct module_sect_attr
-{
+struct module_sect_attr {
 	struct module_attribute mattr;
 	char *name;
 	unsigned long address;
 };
 
-struct module_sect_attrs
-{
+struct module_sect_attrs {
 	struct attribute_group grp;
 	unsigned int nsections;
 	struct module_sect_attr attrs[0];
@@ -1550,7 +1541,8 @@ static int module_add_modinfo_attrs(struct module *mod)
 		    (attr->test && attr->test(mod))) {
 			memcpy(temp_attr, attr, sizeof(*temp_attr));
 			sysfs_attr_init(&temp_attr->attr);
-			error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
+			error = sysfs_create_file(&mod->mkobj.kobj,
+					&temp_attr->attr);
 			++temp_attr;
 		}
 	}
@@ -1566,7 +1558,7 @@ static void module_remove_modinfo_attrs(struct module *mod)
 		/* pick a field to test for end of list */
 		if (!attr->attr.name)
 			break;
-		sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
+		sysfs_remove_file(&mod->mkobj.kobj, &attr->attr);
 		if (attr->free)
 			attr->free(mod);
 	}
@@ -1697,18 +1689,6 @@ static void mod_sysfs_teardown(struct module *mod)
 	mod_sysfs_fini(mod);
 }
 
-/*
- * unlink the module with the whole machine is stopped with interrupts off
- * - this defends against kallsyms not taking locks
- */
-static int __unlink_module(void *_mod)
-{
-	struct module *mod = _mod;
-	list_del(&mod->list);
-	module_bug_cleanup(mod);
-	return 0;
-}
-
 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
 /*
  * LKM RO/NX protection: protect module's text/ro-data
@@ -1824,7 +1804,7 @@ static void unset_module_core_ro_nx(struct module *mod) { }
 static void unset_module_init_ro_nx(struct module *mod) { }
 #endif
 
-void __weak module_free(struct module *mod, void *module_region)
+void __weak module_memfree(void *module_region)
 {
 	vfree(module_region);
 }
@@ -1833,6 +1813,10 @@ void __weak module_arch_cleanup(struct module *mod)
 {
 }
 
+void __weak module_arch_freeing_init(struct module *mod)
+{
+}
+
 /* Free a module, remove from lists, etc. */
 static void free_module(struct module *mod)
 {
@@ -1860,12 +1844,18 @@ static void free_module(struct module *mod)
 
 	/* Now we can delete it from the lists */
 	mutex_lock(&module_mutex);
-	stop_machine(__unlink_module, mod, NULL);
+	/* Unlink carefully: kallsyms could be walking list. */
+	list_del_rcu(&mod->list);
+	/* Remove this module from bug list, this uses list_del_rcu */
+	module_bug_cleanup(mod);
+	/* Wait for RCU synchronizing before releasing mod->list and buglist. */
+	synchronize_rcu();
 	mutex_unlock(&module_mutex);
 
 	/* This may be NULL, but that's OK */
 	unset_module_init_ro_nx(mod);
-	module_free(mod, mod->module_init);
+	module_arch_freeing_init(mod);
+	module_memfree(mod->module_init);
 	kfree(mod->args);
 	percpu_modfree(mod);
 
@@ -1874,7 +1864,7 @@ static void free_module(struct module *mod)
 
 	/* Finally, free the core (containing the module structure) */
 	unset_module_core_ro_nx(mod);
-	module_free(mod, mod->module_core);
+	module_memfree(mod->module_core);
 
 #ifdef CONFIG_MPU
 	update_protections(current->mm);
@@ -1955,7 +1945,7 @@ static int simplify_symbols(struct module *mod, const struct load_info *info)
 			/* We compiled with -fno-common.  These are not
 			   supposed to happen.  */
 			pr_debug("Common symbol: %s\n", name);
-			printk("%s: please compile with -fno-common\n",
+			pr_warn("%s: please compile with -fno-common\n",
 			       mod->name);
 			ret = -ENOEXEC;
 			break;
@@ -2259,7 +2249,7 @@ static char elf_type(const Elf_Sym *sym, const struct load_info *info)
 }
 
 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
-                           unsigned int shnum)
+			unsigned int shnum)
 {
 	const Elf_Shdr *sec;
 
@@ -2735,7 +2725,7 @@ static int find_module_sections(struct module *mod, struct load_info *info)
 		 * This shouldn't happen with same compiler and binutils
 		 * building all parts of the module.
 		 */
-		printk(KERN_WARNING "%s: has both .ctors and .init_array.\n",
+		pr_warn("%s: has both .ctors and .init_array.\n",
 		       mod->name);
 		return -EINVAL;
 	}
@@ -2809,7 +2799,7 @@ static int move_module(struct module *mod, struct load_info *info)
 		 */
 		kmemleak_ignore(ptr);
 		if (!ptr) {
-			module_free(mod, mod->module_core);
+			module_memfree(mod->module_core);
 			return -ENOMEM;
 		}
 		memset(ptr, 0, mod->init_size);
@@ -2954,8 +2944,9 @@ static struct module *layout_and_allocate(struct load_info *info, int flags)
 static void module_deallocate(struct module *mod, struct load_info *info)
 {
 	percpu_modfree(mod);
-	module_free(mod, mod->module_init);
-	module_free(mod, mod->module_core);
+	module_arch_freeing_init(mod);
+	module_memfree(mod->module_init);
+	module_memfree(mod->module_core);
 }
 
 int __weak module_finalize(const Elf_Ehdr *hdr,
@@ -3007,10 +2998,31 @@ static void do_mod_ctors(struct module *mod)
 #endif
 }
 
+/* For freeing module_init on success, in case kallsyms traversing */
+struct mod_initfree {
+	struct rcu_head rcu;
+	void *module_init;
+};
+
+static void do_free_init(struct rcu_head *head)
+{
+	struct mod_initfree *m = container_of(head, struct mod_initfree, rcu);
+	module_memfree(m->module_init);
+	kfree(m);
+}
+
 /* This is where the real work happens */
 static int do_init_module(struct module *mod)
 {
 	int ret = 0;
+	struct mod_initfree *freeinit;
+
+	freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL);
+	if (!freeinit) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+	freeinit->module_init = mod->module_init;
 
 	/*
 	 * We want to find out whether @mod uses async during init.  Clear
@@ -3023,16 +3035,7 @@ static int do_init_module(struct module *mod)
 	if (mod->init != NULL)
 		ret = do_one_initcall(mod->init);
 	if (ret < 0) {
-		/* Init routine failed: abort.  Try to protect us from
-                   buggy refcounters. */
-		mod->state = MODULE_STATE_GOING;
-		synchronize_sched();
-		module_put(mod);
-		blocking_notifier_call_chain(&module_notify_list,
-					     MODULE_STATE_GOING, mod);
-		free_module(mod);
-		wake_up_all(&module_wq);
-		return ret;
+		goto fail_free_freeinit;
 	}
 	if (ret > 0) {
 		pr_warn("%s: '%s'->init suspiciously returned %d, it should "
@@ -3077,15 +3080,35 @@ static int do_init_module(struct module *mod)
 	mod->strtab = mod->core_strtab;
 #endif
 	unset_module_init_ro_nx(mod);
-	module_free(mod, mod->module_init);
+	module_arch_freeing_init(mod);
 	mod->module_init = NULL;
 	mod->init_size = 0;
 	mod->init_ro_size = 0;
 	mod->init_text_size = 0;
+	/*
+	 * We want to free module_init, but be aware that kallsyms may be
+	 * walking this with preempt disabled.  In all the failure paths,
+	 * we call synchronize_rcu/synchronize_sched, but we don't want
+	 * to slow down the success path, so use actual RCU here.
+	 */
+	call_rcu(&freeinit->rcu, do_free_init);
 	mutex_unlock(&module_mutex);
 	wake_up_all(&module_wq);
 
 	return 0;
+
+fail_free_freeinit:
+	kfree(freeinit);
+fail:
+	/* Try to protect us from buggy refcounters. */
+	mod->state = MODULE_STATE_GOING;
+	synchronize_sched();
+	module_put(mod);
+	blocking_notifier_call_chain(&module_notify_list,
+				     MODULE_STATE_GOING, mod);
+	free_module(mod);
+	wake_up_all(&module_wq);
+	return ret;
 }
 
 static int may_init_module(void)
@@ -3202,7 +3225,7 @@ out:
 
 static int unknown_module_param_cb(char *param, char *val, const char *modname)
 {
-	/* Check for magic 'dyndbg' arg */ 
+	/* Check for magic 'dyndbg' arg */
 	int ret = ddebug_dyndbg_module_param_cb(param, val, modname);
 	if (ret != 0)
 		pr_warn("%s: unknown parameter '%s' ignored\n", modname, param);
@@ -3352,6 +3375,8 @@ static int load_module(struct load_info *info, const char __user *uargs,
 	/* Unlink carefully: kallsyms could be walking list. */
 	list_del_rcu(&mod->list);
 	wake_up_all(&module_wq);
+	/* Wait for RCU synchronizing before releasing mod->list. */
+	synchronize_rcu();
 	mutex_unlock(&module_mutex);
  free_module:
 	module_deallocate(mod, info);
@@ -3685,8 +3710,8 @@ static int m_show(struct seq_file *m, void *p)
 
 	/* Informative for users. */
 	seq_printf(m, " %s",
-		   mod->state == MODULE_STATE_GOING ? "Unloading":
-		   mod->state == MODULE_STATE_COMING ? "Loading":
+		   mod->state == MODULE_STATE_GOING ? "Unloading" :
+		   mod->state == MODULE_STATE_COMING ? "Loading" :
 		   "Live");
 	/* Used by oprofile and other similar tools. */
 	seq_printf(m, " 0x%pK", mod->module_core);
@@ -3695,7 +3720,7 @@ static int m_show(struct seq_file *m, void *p)
 	if (mod->taints)
 		seq_printf(m, " %s", module_flags(mod, buf));
 
-	seq_printf(m, "\n");
+	seq_puts(m, "\n");
 	return 0;
 }