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Subject[PATCH] ACPI: PRM: Annotate struct prm_module_info with __counted_by
Date
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 prm_module_info.

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

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Len Brown <lenb@kernel.org>
Cc: linux-acpi@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
drivers/acpi/prmt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
index 7020584096bf..c78453c74ef5 100644
--- a/drivers/acpi/prmt.c
+++ b/drivers/acpi/prmt.c
@@ -69,7 +69,7 @@ struct prm_module_info {
bool updatable;

struct list_head module_list;
- struct prm_handler_info handlers[];
+ struct prm_handler_info handlers[] __counted_by(handler_count);
};

static u64 efi_pa_va_lookup(u64 pa)
--
2.34.1
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