linux-kernel - Re: [PATCH] drivers: firmware: efi: fix Kconfig dependency on CRYPTO

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Date:   Sun, 28 Feb 2021 15:30:29 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Julian Braha <julianbraha@...il.com>
Cc:     linux-efi <linux-efi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers: firmware: efi: fix Kconfig dependency on CRYPTO

On Sat, 27 Feb 2021 at 04:29, Julian Braha <julianbraha@...il.com> wrote:
>
> When EFI_EMBEDDED_FIRMWARE is enabled, and CRYPTO is not enabled,
> Kbuild gives the following warning:
>
> WARNING: unmet direct dependencies detected for CRYPTO_LIB_SHA256
>   Depends on [n]: CRYPTO [=n]
>   Selected by [y]:
>   - EFI_EMBEDDED_FIRMWARE [=y] && EFI [=y]
>
> This is because EFI_EMBEDDED_FIRMWARE selects CRYPTO_LIB_SHA256
> without selecting or depending on CRYPTO, despite CRYPTO_LIB_SHA256
> depending on CRYPTO.
>
> Signed-off-by: Julian Braha <julianbraha@...il.com>

Could you try the below instead? CRYPTO_LIB_SHA256 should not depend
on CRYPTO in the first place, we should fix that if we can

diff --git a/crypto/Kconfig b/crypto/Kconfig
index a367fcfeb5d4..77e6bc6df0ee 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1936,9 +1936,10 @@ config CRYPTO_STATS
 config CRYPTO_HASH_INFO
        bool

-source "lib/crypto/Kconfig"
 source "drivers/crypto/Kconfig"
 source "crypto/asymmetric_keys/Kconfig"
 source "certs/Kconfig"

 endif  # if CRYPTO
+
+source "lib/crypto/Kconfig"


> ---
>  drivers/firmware/efi/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
> index 2c3dac5ecb36..f914da9845ac 100644
> --- a/drivers/firmware/efi/Kconfig
> +++ b/drivers/firmware/efi/Kconfig
> @@ -248,6 +248,7 @@ endmenu
>  config EFI_EMBEDDED_FIRMWARE
>         bool
>         depends on EFI
> +       select CRYPTO
>         select CRYPTO_LIB_SHA256
>
>  config UEFI_CPER
> --
> 2.27.0
>