[PATCH] module: Annotate struct module_notes_attrs with __counted_by

[Kees Cook]

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct module_notes_attrs.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: linux-modules@xxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
 kernel/module/sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/module/sysfs.c b/kernel/module/sysfs.c
index c921bf044050..d964167c6658 100644
--- a/kernel/module/sysfs.c
+++ b/kernel/module/sysfs.c
@@ -143,7 +143,7 @@ static void remove_sect_attrs(struct module *mod)
 struct module_notes_attrs {
 	struct kobject *dir;
 	unsigned int notes;
-	struct bin_attribute attrs[];
+	struct bin_attribute attrs[] __counted_by(notes);
 };
 
 static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
-- 
2.34.1