linux-kernel - [PATCH 1/6] efistub: pass uefi secureboot flag via fdt params

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Date:   Fri,  4 Sep 2020 15:29:00 +0800
From:   Chester Lin <clin@...e.com>
To:     ardb@...nel.org, catalin.marinas@....com, will@...nel.org,
        zohar@...ux.ibm.com, dmitry.kasatkin@...il.com, corbet@....net,
        mark.rutland@....com, vincenzo.frascino@....com,
        samitolvanen@...gle.com, masahiroy@...nel.org, mingo@...nel.org
CC:     linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-integrity@...r.kernel.org, linux-doc@...r.kernel.org,
        jlee@...e.com, clin@...e.com
Subject: [PATCH 1/6] efistub: pass uefi secureboot flag via fdt params

Add a new UEFI parameter: "linux,uefi-secure-boot" in fdt boot params
as other architectures have done in their own boot data. For example,
the boot_params->secure_boot in x86.

Signed-off-by: Chester Lin <clin@...e.com>
---
 drivers/firmware/efi/libstub/fdt.c | 39 +++++++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/libstub/fdt.c b/drivers/firmware/efi/libstub/fdt.c
index 11ecf3c4640e..c9a341e4715f 100644
--- a/drivers/firmware/efi/libstub/fdt.c
+++ b/drivers/firmware/efi/libstub/fdt.c
@@ -136,6 +136,10 @@ static efi_status_t update_fdt(void *orig_fdt, unsigned long orig_fdt_size,
 	if (status)
 		goto fdt_set_fail;
 
+	status = fdt_setprop_var(fdt, node, "linux,uefi-secure-boot", fdt_val32);
+	if (status)
+		goto fdt_set_fail;
+
 	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
 		efi_status_t efi_status;
 
@@ -199,6 +203,24 @@ static efi_status_t update_fdt_memmap(void *fdt, struct efi_boot_memmap *map)
 	return EFI_SUCCESS;
 }
 
+static efi_status_t update_fdt_secboot(void *fdt, u32 secboot)
+{
+	int node = fdt_path_offset(fdt, "/chosen");
+	u32 fdt_val32;
+	int err;
+
+	if (node < 0)
+		return EFI_LOAD_ERROR;
+
+	fdt_val32 = cpu_to_fdt32(secboot);
+
+	err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-secure-boot", fdt_val32);
+	if (err)
+		return EFI_LOAD_ERROR;
+
+	return EFI_SUCCESS;
+}
+
 struct exit_boot_struct {
 	efi_memory_desc_t	*runtime_map;
 	int			*runtime_entry_count;
@@ -208,6 +230,9 @@ struct exit_boot_struct {
 static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
 				   void *priv)
 {
+	efi_status_t status;
+	enum efi_secureboot_mode secboot_status;
+	u32 secboot_var = 0;
 	struct exit_boot_struct *p = priv;
 	/*
 	 * Update the memory map with virtual addresses. The function will also
@@ -217,7 +242,19 @@ static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
 	efi_get_virtmap(*map->map, *map->map_size, *map->desc_size,
 			p->runtime_map, p->runtime_entry_count);
 
-	return update_fdt_memmap(p->new_fdt_addr, map);
+	status = update_fdt_memmap(p->new_fdt_addr, map);
+
+	if (status != EFI_SUCCESS)
+		return status;
+
+	secboot_status = efi_get_secureboot();
+
+	if (secboot_status == efi_secureboot_mode_enabled)
+		secboot_var = 1;
+
+	status = update_fdt_secboot(p->new_fdt_addr, secboot_var);
+
+	return status;
 }
 
 #ifndef MAX_FDT_SIZE
-- 
2.26.1