Hi Jonathan,
Please use a cover letter when sending more than a single patch.
On Sat, 12 Oct 2024 at 00:51, Jonathan Marek <jonathan@xxxxxxxx> wrote:
>
> efi_convert_cmdline() always returns a size of at least 1 because it counts
> the NUL terminator, so the "cmdline_size == 0" condition is not possible.
>
> Change it to compare against 1 to get the intended behavior: to use
> CONFIG_CMDLINE when load_options_size is 0.
>
> Fixes: 60f38de7a8d4 ("efi/libstub: Unify command line param parsing")
> Signed-off-by: Jonathan Marek <jonathan@xxxxxxxx>
> ---
> drivers/firmware/efi/libstub/efi-stub.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c
> index 958a680e0660d..709ae2d41a632 100644
> --- a/drivers/firmware/efi/libstub/efi-stub.c
> +++ b/drivers/firmware/efi/libstub/efi-stub.c
> @@ -129,7 +129,7 @@ efi_status_t efi_handle_cmdline(efi_loaded_image_t *image, char **cmdline_ptr)
>
> if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) ||
> IS_ENABLED(CONFIG_CMDLINE_FORCE) ||
> - cmdline_size == 0) {
> + cmdline_size == 1) {
I'd prefer it if we could keep the weirdness local to
efi_convert_cmdline(). Would the below fix things too?
--- a/drivers/firmware/efi/libstub/efi-stub-helper.c
+++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
@@ -395,9 +395,7 @@
}
}
- options_bytes++; /* NUL termination */
-
- status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, options_bytes,
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, options_bytes + 1,
(void **)&cmdline_addr);
if (status != EFI_SUCCESS)
return NULL;
Note that the only other caller of efi_convert_cmdline() in x86-stub.c
ignores this value entirely.
