[PATCH v2 08/14] ARM: am625: support hash verification of full barebox

[Sascha Hauer <s.hauer@pengutronix.de>]

This implements the necessary SoC code to check the full barebox against
a sha256 compiled into the first stage barebox.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 arch/arm/mach-k3/Kconfig |  1 +
 arch/arm/mach-k3/r5.c    | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/arch/arm/mach-k3/Kconfig b/arch/arm/mach-k3/Kconfig
index 50919dc7e3..561ad1dac4 100644
--- a/arch/arm/mach-k3/Kconfig
+++ b/arch/arm/mach-k3/Kconfig
@@ -16,6 +16,7 @@ config MACH_K3_CORTEX_R5
 	select ELF
 	select K3_DDRSS
 	select FIP
+	select HAVE_FIRMWARE_VERIFY_NEXT_IMAGE
 	depends on 32BIT
 	select ARM_USE_COMPRESSED_DTB
 	default y
diff --git a/arch/arm/mach-k3/r5.c b/arch/arm/mach-k3/r5.c
index 4eaf8658da..79bdb7aac7 100644
--- a/arch/arm/mach-k3/r5.c
+++ b/arch/arm/mach-k3/r5.c
@@ -248,6 +248,8 @@ static int load_fip(const char *filename, off_t offset)
 {
 	struct fip_state *fip;
 	struct fip_image_desc *desc;
+	unsigned char shasum[SHA256_DIGEST_SIZE];
+	int ret;
 
 	fip = fip_image_open(filename, offset);
 	if (IS_ERR(fip)) {
@@ -255,6 +257,18 @@ static int load_fip(const char *filename, off_t offset)
 		return PTR_ERR(fip);
 	}
 
+	if (IS_ENABLED(CONFIG_FIRMWARE_VERIFY_NEXT_IMAGE)) {
+		ret = fip_sha256(fip, shasum);
+		if (ret) {
+			pr_err("Cannot calc fip sha256: %pe\n", ERR_PTR(ret));
+			return ret;
+		}
+
+		ret = firmware_next_image_check_sha256(shasum, true);
+		if (ret)
+			return ret;
+	}
+
 	fip_for_each_desc(fip, desc) {
 		struct fip_toc_entry *toc_entry = &desc->image->toc_e;
 

-- 
2.39.5