Re: [PATCH -next] fw_cfg: Constify struct kobj_type

["Gabriel L. Somlo" <somlo@cmu.edu>]

On Wed, Sep 04, 2024 at 09:17:43AM +0800, Hongbo Li wrote:
> This 'struct kobj_type' is not modified. It is only used in
> kobject_init_and_add() which takes a 'const struct kobj_type *ktype'
> parameter.
> 
> Constifying this structure and moving it to a read-only section,
> and this can increase over all security.
> 
> ```
> [Before]
>    text   data    bss    dec    hex    filename
>    5974   1008     96   7078   1ba6    drivers/firmware/qemu_fw_cfg.o
> 
> [After]
>    text   data    bss    dec    hex    filename
>    6038    944     96   7078   1ba6    drivers/firmware/qemu_fw_cfg.o
> ```
> 
> Signed-off-by: Hongbo Li <lihongbo22@huawei.com>

Acked-by: Gabriel L. Somlo <somlo@cmu.edu>

Thanks,
--Gabriel

> ---
>  drivers/firmware/qemu_fw_cfg.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c
> index 5f43dfa22f79..85c525745b31 100644
> --- a/drivers/firmware/qemu_fw_cfg.c
> +++ b/drivers/firmware/qemu_fw_cfg.c
> @@ -452,7 +452,7 @@ static void fw_cfg_sysfs_release_entry(struct kobject *kobj)
>  }
>  
>  /* kobj_type: ties together all properties required to register an entry */
> -static struct kobj_type fw_cfg_sysfs_entry_ktype = {
> +static const struct kobj_type fw_cfg_sysfs_entry_ktype = {
>  	.default_groups = fw_cfg_sysfs_entry_groups,
>  	.sysfs_ops = &fw_cfg_sysfs_attr_ops,
>  	.release = fw_cfg_sysfs_release_entry,
> -- 
> 2.34.1
>