Re: [PATCH 1/6] efi: Retrieve Apple device properties

[Matt Fleming]

On Thu, 28 Jul, at 02:25:41AM, Lukas Wunner wrote:
> 
> diff --git a/arch/x86/boot/compressed/eboot.c 
> b/arch/x86/boot/compressed/eboot.c
> index ff574da..7262ee4 100644
> --- a/arch/x86/boot/compressed/eboot.c
> +++ b/arch/x86/boot/compressed/eboot.c
> @@ -571,6 +571,55 @@ free_handle:
>       efi_call_early(free_pool, pci_handle);
>  }
>  
> +static void retrieve_apple_device_properties(struct boot_params *params)
> +{
> +     efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
> +     struct setup_data *data, *new;
> +     efi_status_t status;
> +     void *properties;
> +     u32 size = 0;
> +
> +     status = efi_early->call(
> +                     (unsigned long)sys_table->boottime->locate_protocol,
> +                     &guid, NULL, &properties);
> +     if (status != EFI_SUCCESS)
> +             return;
> +
> +     do {
> +             status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
> +                     size + sizeof(struct setup_data), &new);
> +             if (status != EFI_SUCCESS) {
> +                     efi_printk(sys_table,
> +                                "Failed to alloc mem for properties\n");
> +                     return;
> +             }
> +             status = efi_early->call(efi_early->is64 ?
> +                     ((apple_properties_protocol_64 *)properties)->get_all :
> +                     ((apple_properties_protocol_32 *)properties)->get_all,
> +                     properties, new->data, &size);
> +             if (status == EFI_BUFFER_TOO_SMALL)
> +                     efi_call_early(free_pool, new);
> +     } while (status == EFI_BUFFER_TOO_SMALL);

Is this looping really required? Do we not know ahead of time what we
expect the size to be? Writing this as a potentially infinite loop (if
broken firmware always returns EFI_BUFFER_TOO_SMALL) is a bad idea.