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module: Annotate struct module_notes_attrs with __counted_by 

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@kernel.org>
Cc: linux-modules@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
This commit is contained in:
Kees Cook 2023-09-22 10:52:53 -07:00 committed by Luis Chamberlain
parent fd06da7761
commit ea0b0bcef4
1 changed files with 1 additions and 1 deletions
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kernel/module/sysfs.c
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@ -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,