From: Daniel Allred d-allred@ti.com
Adds an API that verifies a signature attached to an image (binary blob). This API is basically a entry to a secure ROM service provided by the device and accessed via an SMC call, using a particular calling convention.
Signed-off-by: Daniel Allred d-allred@ti.com Signed-off-by: Andreas Dannenberg dannenberg@ti.com --- arch/arm/cpu/armv7/omap5/Makefile | 1 + arch/arm/cpu/armv7/omap5/sec_fxns.c | 70 +++++++++++++++++++++++++++++ arch/arm/include/asm/arch-omap5/sys_proto.h | 4 ++ 3 files changed, 75 insertions(+) create mode 100644 arch/arm/cpu/armv7/omap5/sec_fxns.c
diff --git a/arch/arm/cpu/armv7/omap5/Makefile b/arch/arm/cpu/armv7/omap5/Makefile index 3caba86..d373bf4 100644 --- a/arch/arm/cpu/armv7/omap5/Makefile +++ b/arch/arm/cpu/armv7/omap5/Makefile @@ -14,3 +14,4 @@ obj-y += hw_data.o obj-y += abb.o obj-y += fdt.o obj-$(CONFIG_IODELAY_RECALIBRATION) += dra7xx_iodelay.o +obj-$(CONFIG_TI_SECURE_DEVICE) += sec_fxns.o diff --git a/arch/arm/cpu/armv7/omap5/sec_fxns.c b/arch/arm/cpu/armv7/omap5/sec_fxns.c new file mode 100644 index 0000000..766333a --- /dev/null +++ b/arch/arm/cpu/armv7/omap5/sec_fxns.c @@ -0,0 +1,70 @@ +/* + * + * Common security functions that rely on secure ROM services + * + * (C) Copyright 2016 + * Texas Instruments, <www.ti.com> + * + * Daniel Allred d-allred@ti.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/arch/sys_proto.h> +#include <asm/omap_common.h> + +#define SIGNATURE_LENGTH (0x118) + +/* API Index for OMAP5, DRA7xx */ +#define API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX (0x0000000E) + +int secure_boot_verify_image(void **image, size_t *size) +{ + int result = 1; + u32 cert_addr, sig_addr; + size_t cert_size; + +#ifndef CONFIG_SYS_DCACHE_OFF + /* Perform cache writeback on input buffer */ + flush_dcache_range( + (u32)*image, + (u32)*image + roundup(*size, ARCH_DMA_MINALIGN)); +#endif + cert_addr = (uint32_t)*image; + *size -= SIGNATURE_LENGTH; /* Subtract out the signature size */ + cert_size = *size; + sig_addr = cert_addr + cert_size; + + /* Check if image load address is 32-bit aligned */ + if (0 != (0x3 & cert_addr)) { + puts("Image is not 4-byte aligned.\n"); + result = 1; + goto auth_exit; + } + + /* Image size also should be multiple of 4 */ + if (0 != (0x3 & cert_size)) { + puts("Image size is not 4-byte aligned.\n"); + result = 1; + goto auth_exit; + } + + /* Call ROM HAL API to verify certificate signature */ + debug("%s: load_addr = %x, size = %x, sig_addr = %x\n", __func__, + cert_addr, cert_size, sig_addr); + + result = secure_rom_call( + API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX, 0, 0, + 4, cert_addr, cert_size, sig_addr, 0xFFFFFFFF); +auth_exit: + if (result != 0) { + puts("Authentication failed!\n"); + printf("Return Value = %08X\n", result); + hang(); + } + + printf("Authentication passed: %s\n", (char *)sig_addr); + + return result; +} diff --git a/arch/arm/include/asm/arch-omap5/sys_proto.h b/arch/arm/include/asm/arch-omap5/sys_proto.h index ab0e7fa..b175124 100644 --- a/arch/arm/include/asm/arch-omap5/sys_proto.h +++ b/arch/arm/include/asm/arch-omap5/sys_proto.h @@ -84,4 +84,8 @@ static inline u32 usec_to_32k(u32 usec) #define OMAP5_SERVICE_L2ACTLR_SET 0x104 #define OMAP5_SERVICE_ACR_SET 0x107
+#ifdef CONFIG_TI_SECURE_DEVICE +int secure_boot_verify_image(void **p_image, size_t *p_size); +#endif + #endif