util/ifittool: Error out if microcodes do not fit the FIT table
parse_microcode_blob() returns success when it reaches max_fit_entries
microcode. It makes the FIT table size verification in
fit_add_microcode_file() useless. This patch makes
parse_microcode_blob() error out if max_fit_entries is reached.
Note that this size verification is critical as a FIT table only
partially listing the microcode patches can lead to boot failures as
recently observed on Raptor Lake-P.
BRANCH=firmware-brya-14505.B
BUG=b:245380705
TEST=compilation errors out when trying to stitch more than
CONFIG_CPU_INTEL_NUM_FIT_ENTRIES microcode patches.
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Change-Id: Id9c5fb6c1e264f3f5137d29201b9021c72d78fde
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67454
Reviewed-by: Selma Bensaid <selma.bensaid@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Zhixing Ma <zhixing.ma@intel.com>
diff --git a/util/cbfstool/fit.c b/util/cbfstool/fit.c
index 7f8218a..8ed2494 100644
--- a/util/cbfstool/fit.c
+++ b/util/cbfstool/fit.c
@@ -275,8 +275,10 @@
struct cbfs_file *mcode_file;
mcode_file = cbfs_get_entry(image, blob_name);
- if (!mcode_file)
+ if (!mcode_file) {
+ ERROR("Couldn't find microcode blob.\n");
return 1;
+ }
fit_location_from_cbfs_header(¤t_offset, &file_length,
mcode_file);
@@ -301,6 +303,11 @@
total_size > file_length)
break;
+ if (num_mcus == max_fit_entries) {
+ ERROR("Maximum of FIT entries reached.\n");
+ return 1;
+ }
+
/* FIXME: Should the checksum be validated? */
mcus[num_mcus].offset = current_offset;
mcus[num_mcus].size = total_size;
@@ -309,9 +316,6 @@
current_offset += mcus[num_mcus].size;
file_length -= mcus[num_mcus].size;
num_mcus++;
- /* Reached limit of FIT entries. */
- if (num_mcus == max_fit_entries)
- break;
if (file_length < sizeof(struct microcode_header))
break;
}
@@ -492,13 +496,6 @@
if (parse_microcode_blob(image, blob_name, &mcus_found, mcus,
max_fit_entries)) {
- ERROR("Couldn't parse microcode blob.\n");
- free(mcus);
- return 1;
- }
-
- if (mcus_found > fit_free_space(fit, max_fit_entries)) {
- ERROR("Maximum of FIT entries reached.\n");
free(mcus);
return 1;
}