From: Pali Rohár pali@kernel.org
Last 4 bytes of kwbimage boot image is checksum. Verify it via the new spl_check_board_image() function which is called by U-Boot SPL after loading kwbimage.
Signed-off-by: Pali Rohár pali@kernel.org Signed-off-by: Marek Behún marek.behun@nic.cz --- arch/arm/mach-mvebu/spl.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+)
diff --git a/arch/arm/mach-mvebu/spl.c b/arch/arm/mach-mvebu/spl.c index 662f430503..f0b84167b9 100644 --- a/arch/arm/mach-mvebu/spl.c +++ b/arch/arm/mach-mvebu/spl.c @@ -100,6 +100,34 @@ u32 spl_mmc_boot_mode(const u32 boot_device) } #endif
+static uint32_t checksum32(void *start, uint32_t len) +{ + uint32_t csum = 0; + uint32_t *p = start; + + while (len > 0) { + csum += *p++; + len -= sizeof(uint32_t); + }; + + return csum; +} + +int spl_check_board_image(struct spl_image_info *spl_image, + const struct spl_boot_device *bootdev) +{ + uint32_t csum = *(uint32_t *)(spl_image->load_addr + + spl_image->size - 4); + + if (checksum32((void *)spl_image->load_addr, + spl_image->size - 4) != csum) { + printf("ERROR: Invalid data checksum in kwbimage\n"); + return -EINVAL; + } + + return 0; +} + int spl_parse_board_header(struct spl_image_info *spl_image, const struct spl_boot_device *bootdev, const void *image_header, size_t size)