diff options
Diffstat (limited to 'boot/fdt_support.c')
| -rw-r--r-- | boot/fdt_support.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/boot/fdt_support.c b/boot/fdt_support.c index 874ca4d6f5..2392027d40 100644 --- a/boot/fdt_support.c +++ b/boot/fdt_support.c @@ -6,12 +6,15 @@ * Copyright 2010-2011 Freescale Semiconductor, Inc. */ +#include <dm.h> #include <abuf.h> #include <env.h> #include <log.h> #include <mapmem.h> #include <net.h> +#include <rng.h> #include <stdio_dev.h> +#include <dm/device_compat.h> #include <dm/ofnode.h> #include <linux/ctype.h> #include <linux/types.h> @@ -273,6 +276,47 @@ int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end) return 0; } +int fdt_kaslrseed(void *fdt, bool overwrite) +{ + int len, err, nodeoffset; + struct udevice *dev; + const u64 *orig; + u64 data = 0; + + err = fdt_check_header(fdt); + if (err < 0) + return err; + + /* find or create "/chosen" node. */ + nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen"); + if (nodeoffset < 0) + return nodeoffset; + + /* return without error if we are not overwriting and existing non-zero node */ + orig = fdt_getprop(fdt, nodeoffset, "kaslr-seed", &len); + if (orig && len == sizeof(*orig)) + data = fdt64_to_cpu(*orig); + if (data && !overwrite) { + debug("not overwriting existing kaslr-seed\n"); + return 0; + } + err = uclass_get_device(UCLASS_RNG, 0, &dev); + if (err) { + printf("No RNG device\n"); + return err; + } + err = dm_rng_read(dev, &data, sizeof(data)); + if (err) { + dev_err(dev, "dm_rng_read failed: %d\n", err); + return err; + } + err = fdt_setprop(fdt, nodeoffset, "kaslr-seed", &data, sizeof(data)); + if (err < 0) + printf("WARNING: could not set kaslr-seed %s.\n", fdt_strerror(err)); + + return err; +} + /** * board_fdt_chosen_bootargs - boards may override this function to use * alternative kernel command line arguments @@ -300,6 +344,15 @@ int fdt_chosen(void *fdt) if (nodeoffset < 0) return nodeoffset; + /* if DM_RNG enabled automatically inject kaslr-seed node unless: + * CONFIG_MEASURED_BOOT enabled: as dt modifications break measured boot + * CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT enabled: as that implementation does not use dm yet + */ + if (IS_ENABLED(CONFIG_DM_RNG) && + !IS_ENABLED(CONFIG_MEASURED_BOOT) && + !IS_ENABLED(CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT)) + fdt_kaslrseed(fdt, false); + if (IS_ENABLED(CONFIG_BOARD_RNG_SEED) && !board_rng_seed(&buf)) { err = fdt_setprop(fdt, nodeoffset, "rng-seed", abuf_data(&buf), abuf_size(&buf)); |