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Exosphere: Support unsigned/plaintext Package2s if signature is clear.

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This commit is contained in:
Michael Scire 2018-04-11 21:56:30 -06:00
parent 0674c4b64f
commit 7ddf5a922c
4 changed files with 17 additions and 3 deletions
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9
exosphere/src/package2.c
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@ -267,7 +267,7 @@ static bool validate_package2_metadata(package2_meta_t *metadata) {
/* Perform version checks. */
/* We will be compatible with all package2s released before current, but not newer ones. */
if (metadata->version_max >= PACKAGE2_MINVER_THEORETICAL && metadata->version_min < PACKAGE2_MAXVER_400_CURRENT) {
if (metadata->version_max >= PACKAGE2_MINVER_THEORETICAL && metadata->version_min < PACKAGE2_MAXVER_500_CURRENT) {
return true;
}
@ -297,6 +297,8 @@ static uint32_t decrypt_and_validate_header(package2_header_t *header) {
if (mkey_rev > mkey_get_revision()) {
panic(0xFAF00003);
}
} else if (!validate_package2_metadata(&header->metadata)) {
panic(0xFAF0003);
}
return 0;
}
@ -445,6 +447,11 @@ void load_package2(coldboot_crt0_reloc_list_t *reloc_list) {
flush_dcache_range((uint8_t *)&header, (uint8_t *)&header + sizeof(header));
/* Perform signature checks. */
/* Special exosphere patching enable: All-zeroes signature + decrypted header implies unsigned and decrypted package2. */
if (header.signature[0] == 0 && memcmp(header.signature, header.signature + 1, sizeof(header.signature) - 1) == 0 && header.metadata.magic == MAGIC_PK21) {
bootconfig_set_package2_plaintext_and_unsigned();
}
verify_header_signature(&header);
/* Decrypt header, get key revision required. */