[PATCH v4 12/36] lib: code tagging module support

[Suren Baghdasaryan <surenb@google.com>]

Add support for code tagging from dynamically loaded modules.

Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Co-developed-by: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
---
 include/linux/codetag.h | 12 +++++++++
 kernel/module/main.c    |  4 +++
 lib/codetag.c           | 58 +++++++++++++++++++++++++++++++++++++++--
 3 files changed, 72 insertions(+), 2 deletions(-)

diff --git a/include/linux/codetag.h b/include/linux/codetag.h
index 7734269cdb63..c44f5b83f24d 100644
--- a/include/linux/codetag.h
+++ b/include/linux/codetag.h
@@ -33,6 +33,10 @@ union codetag_ref {
 struct codetag_type_desc {
 	const char *section;
 	size_t tag_size;
+	void (*module_load)(struct codetag_type *cttype,
+			    struct codetag_module *cmod);
+	void (*module_unload)(struct codetag_type *cttype,
+			      struct codetag_module *cmod);
 };
 
 struct codetag_iterator {
@@ -65,4 +69,12 @@ void codetag_to_text(struct seq_buf *out, struct codetag *ct);
 struct codetag_type *
 codetag_register_type(const struct codetag_type_desc *desc);
 
+#if defined(CONFIG_CODE_TAGGING) && defined(CONFIG_MODULES)
+void codetag_load_module(struct module *mod);
+void codetag_unload_module(struct module *mod);
+#else
+static inline void codetag_load_module(struct module *mod) {}
+static inline void codetag_unload_module(struct module *mod) {}
+#endif
+
 #endif /* _LINUX_CODETAG_H */
diff --git a/kernel/module/main.c b/kernel/module/main.c
index 36681911c05a..f400ba076cc7 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -56,6 +56,7 @@
 #include <linux/dynamic_debug.h>
 #include <linux/audit.h>
 #include <linux/cfi.h>
+#include <linux/codetag.h>
 #include <linux/debugfs.h>
 #include <uapi/linux/module.h>
 #include "internal.h"
@@ -1242,6 +1243,7 @@ static void free_module(struct module *mod)
 {
 	trace_module_free(mod);
 
+	codetag_unload_module(mod);
 	mod_sysfs_teardown(mod);
 
 	/*
@@ -2978,6 +2980,8 @@ static int load_module(struct load_info *info, const char __user *uargs,
 	/* Get rid of temporary copy. */
 	free_copy(info, flags);
 
+	codetag_load_module(mod);
+
 	/* Done! */
 	trace_module_load(mod);
 
diff --git a/lib/codetag.c b/lib/codetag.c
index 8b5b89ad508d..9af22648dbfa 100644
--- a/lib/codetag.c
+++ b/lib/codetag.c
@@ -124,15 +124,20 @@ static void *get_symbol(struct module *mod, const char *prefix, const char *name
 {
 	DECLARE_SEQ_BUF(sb, KSYM_NAME_LEN);
 	const char *buf;
+	void *ret;
 
 	seq_buf_printf(&sb, "%s%s", prefix, name);
 	if (seq_buf_has_overflowed(&sb))
 		return NULL;
 
 	buf = seq_buf_str(&sb);
-	return mod ?
+	preempt_disable();
+	ret = mod ?
 		(void *)find_kallsyms_symbol_value(mod, buf) :
 		(void *)kallsyms_lookup_name(buf);
+	preempt_enable();
+
+	return ret;
 }
 
 static struct codetag_range get_section_range(struct module *mod,
@@ -173,8 +178,11 @@ static int codetag_module_init(struct codetag_type *cttype, struct module *mod)
 
 	down_write(&cttype->mod_lock);
 	err = idr_alloc(&cttype->mod_idr, cmod, 0, 0, GFP_KERNEL);
-	if (err >= 0)
+	if (err >= 0) {
 		cttype->count += range_size(cttype, &range);
+		if (cttype->desc.module_load)
+			cttype->desc.module_load(cttype, cmod);
+	}
 	up_write(&cttype->mod_lock);
 
 	if (err < 0) {
@@ -217,3 +225,49 @@ codetag_register_type(const struct codetag_type_desc *desc)
 
 	return cttype;
 }
+
+void codetag_load_module(struct module *mod)
+{
+	struct codetag_type *cttype;
+
+	if (!mod)
+		return;
+
+	mutex_lock(&codetag_lock);
+	list_for_each_entry(cttype, &codetag_types, link)
+		codetag_module_init(cttype, mod);
+	mutex_unlock(&codetag_lock);
+}
+
+void codetag_unload_module(struct module *mod)
+{
+	struct codetag_type *cttype;
+
+	if (!mod)
+		return;
+
+	mutex_lock(&codetag_lock);
+	list_for_each_entry(cttype, &codetag_types, link) {
+		struct codetag_module *found = NULL;
+		struct codetag_module *cmod;
+		unsigned long mod_id, tmp;
+
+		down_write(&cttype->mod_lock);
+		idr_for_each_entry_ul(&cttype->mod_idr, cmod, tmp, mod_id) {
+			if (cmod->mod && cmod->mod == mod) {
+				found = cmod;
+				break;
+			}
+		}
+		if (found) {
+			if (cttype->desc.module_unload)
+				cttype->desc.module_unload(cttype, cmod);
+
+			cttype->count -= range_size(cttype, &cmod->range);
+			idr_remove(&cttype->mod_idr, mod_id);
+			kfree(cmod);
+		}
+		up_write(&cttype->mod_lock);
+	}
+	mutex_unlock(&codetag_lock);
+}
-- 
2.44.0.rc0.258.g7320e95886-goog