alloc_tag: handle module codetag load errors as module load failures

Failures inside codetag_load_module() are currently ignored.  As a result
an error there would not cause a module load failure and freeing of the
associated resources.  Correct this behavior by propagating the error code
to the caller and handling possible errors.  With this change, error to
allocate percpu counters, which happens at this stage, will not be ignored
and will cause a module load failure and freeing of resources.  With this
change we also do not need to disable memory allocation profiling when
this error happens, instead we fail to load the module.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 1007526 ("alloc_tag: allocate percpu counters for module tags dynamically")
Signed-off-by: Suren Baghdasaryan <[email protected]>
Reported-by: Casey Chen <[email protected]>
Closes: https://lore.kernel.org/all/[email protected]/
Cc: Daniel Gomez <[email protected]>
Cc: David Wang <[email protected]>
Cc: Kent Overstreet <[email protected]>
Cc: Luis Chamberalin <[email protected]>
Cc: Petr Pavlu <[email protected]>
Cc: Sami Tolvanen <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: surenbaghdasaryan

include/linux/codetag.h

@@ -36,8 +36,8 @@ union codetag_ref {
 struct codetag_type_desc {
 	const char *section;
 	size_t tag_size;
-	void (*module_load)(struct module *mod,
-			    struct codetag *start, struct codetag *end);
+	int (*module_load)(struct module *mod,
+			   struct codetag *start, struct codetag *end);
 	void (*module_unload)(struct module *mod,
 			      struct codetag *start, struct codetag *end);
 #ifdef CONFIG_MODULES
@@ -89,7 +89,7 @@ void *codetag_alloc_module_section(struct module *mod, const char *name,
 				   unsigned long align);
 void codetag_free_module_sections(struct module *mod);
 void codetag_module_replaced(struct module *mod, struct module *new_mod);
-void codetag_load_module(struct module *mod);
+int codetag_load_module(struct module *mod);
 void codetag_unload_module(struct module *mod);
 
 #else /* defined(CONFIG_CODE_TAGGING) && defined(CONFIG_MODULES) */
@@ -103,7 +103,7 @@ codetag_alloc_module_section(struct module *mod, const char *name,
 			     unsigned long align) { return NULL; }
 static inline void codetag_free_module_sections(struct module *mod) {}
 static inline void codetag_module_replaced(struct module *mod, struct module *new_mod) {}
-static inline void codetag_load_module(struct module *mod) {}
+static inline int codetag_load_module(struct module *mod) { return 0; }
 static inline void codetag_unload_module(struct module *mod) {}
 
 #endif /* defined(CONFIG_CODE_TAGGING) && defined(CONFIG_MODULES) */

kernel/module/main.c

@@ -3386,11 +3386,12 @@ static int load_module(struct load_info *info, const char __user *uargs,
 			goto sysfs_cleanup;
 	}
 
+	if (codetag_load_module(mod))
+		goto sysfs_cleanup;
+
 	/* Get rid of temporary copy. */
 	free_copy(info, flags);
 
-	codetag_load_module(mod);
-
 	/* Done! */
 	trace_module_load(mod);
 

lib/alloc_tag.c

@@ -607,15 +607,16 @@ static void release_module_tags(struct module *mod, bool used)
 	mas_unlock(&mas);
 }
 
-static void load_module(struct module *mod, struct codetag *start, struct codetag *stop)
+static int load_module(struct module *mod, struct codetag *start, struct codetag *stop)
 {
 	/* Allocate module alloc_tag percpu counters */
 	struct alloc_tag *start_tag;
 	struct alloc_tag *stop_tag;
 	struct alloc_tag *tag;
 
+	/* percpu counters for core allocations are already statically allocated */
 	if (!mod)
-		return;
+		return 0;
 
 	start_tag = ct_to_alloc_tag(start);
 	stop_tag = ct_to_alloc_tag(stop);
@@ -627,12 +628,13 @@ static void load_module(struct module *mod, struct codetag *start, struct codeta
 				free_percpu(tag->counters);
 				tag->counters = NULL;
 			}
-			shutdown_mem_profiling(true);
-			pr_err("Failed to allocate memory for allocation tag percpu counters in the module %s. Memory allocation profiling is disabled!\n",
+			pr_err("Failed to allocate memory for allocation tag percpu counters in the module %s\n",
 			       mod->name);
-			break;
+			return -ENOMEM;
 		}
 	}
+
+	return 0;
 }
 
 static void replace_module(struct module *mod, struct module *new_mod)

lib/codetag.c

@@ -167,6 +167,7 @@ static int codetag_module_init(struct codetag_type *cttype, struct module *mod)
 {
 	struct codetag_range range;
 	struct codetag_module *cmod;
+	int mod_id;
 	int err;
 
 	range = get_section_range(mod, cttype->desc.section);
@@ -190,11 +191,20 @@ static int codetag_module_init(struct codetag_type *cttype, struct module *mod)
 	cmod->range = range;
 
 	down_write(&cttype->mod_lock);
-	err = idr_alloc(&cttype->mod_idr, cmod, 0, 0, GFP_KERNEL);
-	if (err >= 0) {
-		cttype->count += range_size(cttype, &range);
-		if (cttype->desc.module_load)
-			cttype->desc.module_load(mod, range.start, range.stop);
+	mod_id = idr_alloc(&cttype->mod_idr, cmod, 0, 0, GFP_KERNEL);
+	if (mod_id >= 0) {
+		if (cttype->desc.module_load) {
+			err = cttype->desc.module_load(mod, range.start, range.stop);
+			if (!err)
+				cttype->count += range_size(cttype, &range);
+			else
+				idr_remove(&cttype->mod_idr, mod_id);
+		} else {
+			cttype->count += range_size(cttype, &range);
+			err = 0;
+		}
+	} else {
+		err = mod_id;
 	}
 	up_write(&cttype->mod_lock);
 
@@ -295,17 +305,23 @@ void codetag_module_replaced(struct module *mod, struct module *new_mod)
 	mutex_unlock(&codetag_lock);
 }
 
-void codetag_load_module(struct module *mod)
+int codetag_load_module(struct module *mod)
 {
 	struct codetag_type *cttype;
+	int ret = 0;
 
 	if (!mod)
-		return;
+		return 0;
 
 	mutex_lock(&codetag_lock);
-	list_for_each_entry(cttype, &codetag_types, link)
-		codetag_module_init(cttype, mod);
+	list_for_each_entry(cttype, &codetag_types, link) {
+		ret = codetag_module_init(cttype, mod);
+		if (ret)
+			break;
+	}
 	mutex_unlock(&codetag_lock);
+
+	return ret;
 }
 
 void codetag_unload_module(struct module *mod)