diff options
| -rw-r--r-- | update_verifier/update_verifier.cpp | 71 |
1 files changed, 42 insertions, 29 deletions
diff --git a/update_verifier/update_verifier.cpp b/update_verifier/update_verifier.cpp index d3a5185b8..b49011a12 100644 --- a/update_verifier/update_verifier.cpp +++ b/update_verifier/update_verifier.cpp @@ -175,40 +175,53 @@ static bool read_blocks(const std::string& partition, const std::string& range_s return true; } +// Returns true to indicate a passing verification (or the error should be ignored); Otherwise +// returns false on fatal errors, where we should reject the current boot and trigger a fallback. +// Note that update_verifier should be backward compatible to not reject care_map.txt from old +// releases, which could otherwise fail to boot into the new release. For example, we've changed +// the care_map format between N and O. An O update_verifier would fail to work with N +// care_map.txt. This could be a result of sideloading an O OTA while the device having a pending N +// update. bool verify_image(const std::string& care_map_name) { - android::base::unique_fd care_map_fd(TEMP_FAILURE_RETRY(open(care_map_name.c_str(), O_RDONLY))); - // If the device is flashed before the current boot, it may not have care_map.txt - // in /data/ota_package. To allow the device to continue booting in this situation, - // we should print a warning and skip the block verification. - if (care_map_fd.get() == -1) { - PLOG(WARNING) << "Failed to open " << care_map_name; - return true; - } - // Care map file has four lines (two lines if vendor partition is not present): - // First line has the block partition name (system/vendor). - // Second line holds all ranges of blocks to verify. - // The next two lines have the same format but for vendor partition. - std::string file_content; - if (!android::base::ReadFdToString(care_map_fd.get(), &file_content)) { - LOG(ERROR) << "Error reading care map contents to string."; - return false; - } + android::base::unique_fd care_map_fd(TEMP_FAILURE_RETRY(open(care_map_name.c_str(), O_RDONLY))); + // If the device is flashed before the current boot, it may not have care_map.txt + // in /data/ota_package. To allow the device to continue booting in this situation, + // we should print a warning and skip the block verification. + if (care_map_fd.get() == -1) { + PLOG(WARNING) << "Failed to open " << care_map_name; + return true; + } + // Care map file has four lines (two lines if vendor partition is not present): + // First line has the block partition name (system/vendor). + // Second line holds all ranges of blocks to verify. + // The next two lines have the same format but for vendor partition. + std::string file_content; + if (!android::base::ReadFdToString(care_map_fd.get(), &file_content)) { + LOG(ERROR) << "Error reading care map contents to string."; + return false; + } - std::vector<std::string> lines; - lines = android::base::Split(android::base::Trim(file_content), "\n"); - if (lines.size() != 2 && lines.size() != 4) { - LOG(ERROR) << "Invalid lines in care_map: found " << lines.size() - << " lines, expecting 2 or 4 lines."; - return false; - } + std::vector<std::string> lines; + lines = android::base::Split(android::base::Trim(file_content), "\n"); + if (lines.size() != 2 && lines.size() != 4) { + LOG(ERROR) << "Invalid lines in care_map: found " << lines.size() + << " lines, expecting 2 or 4 lines."; + return false; + } - for (size_t i = 0; i < lines.size(); i += 2) { - if (!read_blocks(lines[i], lines[i+1])) { - return false; - } + for (size_t i = 0; i < lines.size(); i += 2) { + // We're seeing an N care_map.txt. Skip the verification since it's not compatible with O + // update_verifier (the last few metadata blocks can't be read via device mapper). + if (android::base::StartsWith(lines[i], "/dev/block/")) { + LOG(WARNING) << "Found legacy care_map.txt; skipped."; + return true; + } + if (!read_blocks(lines[i], lines[i+1])) { + return false; } + } - return true; + return true; } static int reboot_device() { |