For ext4 filesystem log if created/modified timestamp differs am: 90560211dd
Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1513056
MUST ONLY BE SUBMITTED BY AUTOMERGER
Change-Id: I561146c9808b94242f974ece4fd9cf1cc934212d
diff --git a/payload_consumer/mount_history.cc b/payload_consumer/mount_history.cc
index 1d2ec76..d699ad9 100644
--- a/payload_consumer/mount_history.cc
+++ b/payload_consumer/mount_history.cc
@@ -54,14 +54,33 @@
// 0x30: len32 Write time
// 0x34: len16 Number of mounts since the last fsck
// 0x38: len16 Magic signature 0xEF53
+ // 0x40: len32 Time of last check
+ // 0x108: len32 When the filesystem was created
time_t mount_time =
*reinterpret_cast<uint32_t*>(&block0_buffer[0x400 + 0x2C]);
+ time_t write_time =
+ *reinterpret_cast<uint32_t*>(&block0_buffer[0x400 + 0x30]);
uint16_t mount_count =
*reinterpret_cast<uint16_t*>(&block0_buffer[0x400 + 0x34]);
uint16_t magic = *reinterpret_cast<uint16_t*>(&block0_buffer[0x400 + 0x38]);
+ time_t check_time =
+ *reinterpret_cast<uint32_t*>(&block0_buffer[0x400 + 0x40]);
+ time_t created_time =
+ *reinterpret_cast<uint32_t*>(&block0_buffer[0x400 + 0x108]);
if (magic == 0xEF53) {
+ // Timestamps can be updated by fsck without updating mount count,
+ // log if any timestamp differ
+ if (! (write_time == created_time && check_time == created_time)) {
+ LOG(WARNING) << "Device have been modified after being created. "
+ << "Filesystem created on "
+ << base::Time::FromTimeT(created_time) << ", "
+ << "last written on "
+ << base::Time::FromTimeT(write_time) << ", "
+ << "last checked on "
+ << base::Time::FromTimeT(check_time) << ".";
+ }
if (mount_count > 0) {
LOG(WARNING) << "Device was remounted R/W " << mount_count << " times. "
<< "Last remount happened on "