diff options
Diffstat (limited to 'meta/recipes-bsp/u-boot/files/CVE-2020-10648-1.patch')
| -rw-r--r-- | meta/recipes-bsp/u-boot/files/CVE-2020-10648-1.patch | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/meta/recipes-bsp/u-boot/files/CVE-2020-10648-1.patch b/meta/recipes-bsp/u-boot/files/CVE-2020-10648-1.patch new file mode 100644 index 0000000000..d784452b44 --- /dev/null +++ b/meta/recipes-bsp/u-boot/files/CVE-2020-10648-1.patch @@ -0,0 +1,98 @@ +From 67acad3db71bb372458fbb8a77749f5eb88aa324 Mon Sep 17 00:00:00 2001 +From: Simon Glass <sjg@chromium.org> +Date: Wed, 18 Mar 2020 11:44:01 -0600 +Subject: [PATCH] image: Check hash-nodes when checking configurations + +It is currently possible to use a different configuration's signature and +thus bypass the configuration check. Make sure that the configuration node +that was hashed matches the one being checked, to catch this problem. + +Also add a proper function comment to fit_config_check_sig() and make it +static. + +Signed-off-by: Simon Glass <sjg@chromium.org> + +CVE: CVE-2020-10648 +Upstream-Status: Backport[https://github.com/u-boot/u-boot/commit/67acad3db71bb372458fbb8a77749f5eb88aa324] +Signed-off-by: Scott Murray <scott.murray@konsulko.com> + +--- + common/image-sig.c | 36 +++++++++++++++++++++++++++++++++--- + 1 file changed, 33 insertions(+), 3 deletions(-) + +diff --git a/common/image-sig.c b/common/image-sig.c +index 13ccd50bc5..03143a4040 100644 +--- a/common/image-sig.c ++++ b/common/image-sig.c +@@ -359,20 +359,39 @@ int fit_image_verify_required_sigs(const void *fit, int image_noffset, + return 0; + } + +-int fit_config_check_sig(const void *fit, int noffset, int required_keynode, +- char **err_msgp) ++/** ++ * fit_config_check_sig() - Check the signature of a config ++ * ++ * @fit: FIT to check ++ * @noffset: Offset of configuration node (e.g. /configurations/conf-1) ++ * @required_keynode: Offset in the control FDT of the required key node, ++ * if any. If this is given, then the configuration wil not ++ * pass verification unless that key is used. If this is ++ * -1 then any signature will do. ++ * @conf_noffset: Offset of the configuration subnode being checked (e.g. ++ * /configurations/conf-1/kernel) ++ * @err_msgp: In the event of an error, this will be pointed to a ++ * help error string to display to the user. ++ * @return 0 if all verified ok, <0 on error ++ */ ++static int fit_config_check_sig(const void *fit, int noffset, ++ int required_keynode, int conf_noffset, ++ char **err_msgp) + { + char * const exc_prop[] = {"data"}; + const char *prop, *end, *name; + struct image_sign_info info; + const uint32_t *strings; ++ const char *config_name; + uint8_t *fit_value; + int fit_value_len; ++ bool found_config; + int max_regions; + int i, prop_len; + char path[200]; + int count; + ++ config_name = fit_get_name(fit, conf_noffset, NULL); + debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(), + fit_get_name(fit, noffset, NULL), + fit_get_name(gd_fdt_blob(), required_keynode, NULL)); +@@ -413,9 +432,20 @@ int fit_config_check_sig(const void *fit, int noffset, int required_keynode, + char *node_inc[count]; + + debug("Hash nodes (%d):\n", count); ++ found_config = false; + for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) { + debug(" '%s'\n", name); + node_inc[i] = (char *)name; ++ if (!strncmp(FIT_CONFS_PATH, name, strlen(FIT_CONFS_PATH)) && ++ name[sizeof(FIT_CONFS_PATH) - 1] == '/' && ++ !strcmp(name + sizeof(FIT_CONFS_PATH), config_name)) { ++ debug(" (found config node %s)", config_name); ++ found_config = true; ++ } ++ } ++ if (!found_config) { ++ *err_msgp = "Selected config not in hashed nodes"; ++ return -1; + } + + /* +@@ -483,7 +513,7 @@ static int fit_config_verify_sig(const void *fit, int conf_noffset, + if (!strncmp(name, FIT_SIG_NODENAME, + strlen(FIT_SIG_NODENAME))) { + ret = fit_config_check_sig(fit, noffset, sig_offset, +- &err_msg); ++ conf_noffset, &err_msg); + if (ret) { + puts("- "); + } else { |