On Fri, Nov 21, 2025 at 07:39:44PM +0000, Bill Wendling wrote:
> Add the '__counted_by_ptr' attribute to the 'regions' field of 'struct
> memblock_type'. The 'regions' field is an array of 'struct
> memblock_region' and its size is tracked by the 'max' field, which
> represents the total number of allocated regions.
>
> This annotation allows the Kernel Address Sanitizer (KASAN) to detect
> out-of-bounds accesses to the 'regions' array.
>
> Signed-off-by: Bill Wendling <[email protected]>
> ---
> include/linux/memblock.h | 2 +-
Please also update tools/testing/memblock
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index 221118b5a16e..ba7f7c999a45 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -91,7 +91,7 @@ struct memblock_type {
> unsigned long cnt;
> unsigned long max;
> phys_addr_t total_size;
> - struct memblock_region *regions;
> + struct memblock_region *regions __counted_by_ptr(max);
> char *name;
> };
>
> --
> 2.52.0.rc2.455.g230fcf2819-goog
>
--
Sincerely yours,
Mike.
