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boot: image-pre-load: Check environment for location of signature info

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Setting an alternative signature info node in "pre_load_sig_info_path"
allows verification of an image using the bootm pre-load mechanism with
a different key, e.g.: setenv pre_load_sig_info_path "/alt/sig" ; bootm
preload [addr]

Signed-off-by: Steven Lawrance <steven.lawrance@softathome.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Steven Lawrance 2022-09-14 20:57:28 +02:00 committed by Tom Rini
parent 7c5eeb8309
commit 05b0f241f2
1 changed files with 6 additions and 1 deletions
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7
boot/image-pre-load.c
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@ -33,6 +33,7 @@ static int image_pre_load_sig_setup(struct image_sig_info *info)
const u32 *sig_size;
int key_len;
int node, ret = 0;
char *sig_info_path = NULL;
if (!info) {
log_err("ERROR: info is NULL for image pre-load sig check\n");
@ -42,7 +43,11 @@ static int image_pre_load_sig_setup(struct image_sig_info *info)
memset(info, 0, sizeof(*info));
node = fdt_path_offset(gd_fdt_blob(), IMAGE_PRE_LOAD_PATH);
sig_info_path = env_get("pre_load_sig_info_path");
if (!sig_info_path)
sig_info_path = IMAGE_PRE_LOAD_PATH;
node = fdt_path_offset(gd_fdt_blob(), sig_info_path);
if (node < 0) {
log_info("INFO: no info for image pre-load sig check\n");
ret = 1;