| // |
| // Copyright (C) 2020 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| |
| #include <inttypes.h> |
| #include <sys/utsname.h> |
| |
| #include <android-base/stringprintf.h> |
| #include <android-base/logging.h> |
| #include <kver/kernel_release.h> |
| #include <kver/utils.h> |
| |
| namespace android::kver { |
| |
| bool IsKernelUpdateValid(const std::optional<KernelRelease>& old_kernel_release, |
| const std::optional<KernelRelease>& new_kernel_release) { |
| // Allow update from non-GKI to non-GKI for legacy devices, or non-GKI to GKI for retrofit |
| // devices. |
| if (!old_kernel_release.has_value()) { |
| LOG(INFO) << "Current build does not contain GKI, permit update to \"" |
| << (new_kernel_release.has_value() ? new_kernel_release->string() : "") |
| << "\" anyways."; |
| return true; |
| } |
| |
| if (!new_kernel_release.has_value()) { |
| LOG(ERROR) << "Cannot update from GKI \"" << old_kernel_release->string() |
| << "\" to non-GKI build."; |
| return false; |
| } |
| |
| // Check that KMI version does not downgrade; i.e. the tuple(w, x, z, k) does |
| // not decrease. |
| if (old_kernel_release->kmi_version().tuple() > new_kernel_release->kmi_version().tuple()) { |
| LOG(ERROR) << "Cannot update from " << old_kernel_release->string() << " to " |
| << new_kernel_release->string() << ": KMI version decreases."; |
| return false; |
| } |
| |
| // This ensures that Android release does not downgrade, e.g. you cannot go |
| // from 5.10-android13-0 to 5.15-android12-0. |
| if (old_kernel_release->android_release() > new_kernel_release->android_release()) { |
| LOG(ERROR) << "Cannot update from " << old_kernel_release->string() << " to " |
| << new_kernel_release->string() << ": Android release decreases."; |
| return false; |
| } |
| |
| // This ensures that w.x.y does not downgrade; e.g. you cannot go |
| // from 5.4.43 to 5.4.42, but you can go from 5.4.43 to 5.10.5. |
| if (old_kernel_release->kernel_version_tuple() > new_kernel_release->kernel_version_tuple()) { |
| LOG(ERROR) << "Cannot update from " << old_kernel_release->string() << " to " |
| << new_kernel_release->string() << ": Kernel version decreases."; |
| return false; |
| } |
| |
| LOG(INFO) << "Allow to update from " << old_kernel_release->string() << " to " |
| << new_kernel_release->string(); |
| return true; |
| } |
| |
| // Keep in sync with kmi.go. |
| std::string GetApexName(const KmiVersion& kmi_version) { |
| static constexpr const char* KMI_VERSION_APEX_NAME_FORMAT{ |
| "com.android.gki.kmi_%" PRIu64 "_%" PRIu64 "_android%" PRIu64 "_%" PRIu64}; |
| return android::base::StringPrintf(KMI_VERSION_APEX_NAME_FORMAT, kmi_version.version(), kmi_version.patch_level(), |
| kmi_version.android_release(), kmi_version.generation()); |
| } |
| |
| uint64_t GetFactoryApexVersion() { |
| return 300000000; |
| } |
| |
| } // namespace android::kver |