Thanks to CmCheckRegistry, the function can perform volatile data purging upon boot which this removes old hacky CmPrepareHive code. This also slightly refactors HvInitialize making it more proper.
=== DOCUMENTATION REMARKS ===
This implements (also enables some parts of code been decayed for years) the transacted writing of the registry. Transacted writing (or writing into registry in a transactional way) is an operation that ensures the successfulness can be achieved by monitoring two main points.
In CMLIB, such points are what we internally call them the primary and secondary sequences. A sequence is a numeric field that is incremented each time a writing operation (namely done with the FileWrite function and such) has successfully completed.
The primary sequence is incremented to suggest that the initial work of syncing the registry is in progress. During this phase, the base block header is written into the primary hive file and registry data is being written to said file in form of blocks. Afterwards the seconady sequence
is increment to report completion of the transactional writing of the registry. This operation occurs in HvpWriteHive function (invoked by HvSyncHive for syncing). If the transactional writing fails or if the lazy flushing of the registry fails, LOG files come into play.
Like HvpWriteHive, LOGs are updated by the HvpWriteLog which writes dirty data (base block header included) to the LOG themselves. These files serve for recovery and emergency purposes in case the primary machine hive has been damaged due to previous forced interruption of writing stuff into
the registry hive. With specific recovery algorithms, the data that's been gathered from a LOG will be applied to the primary hive, salvaging it. But if a LOG file is corrupt as well, then the system will perform resuscitation techniques by reconstructing the base block header to reasonable values,
reset the registry signature and whatnot.
This work is an inspiration from PR #3932 by mrmks04 (aka Max Korostil). I have continued his work by doing some more tweaks and whatnot. In addition to that, the whole transaction writing code is documented.
=== IMPORTANT NOTES ===
HvpWriteLog -- Currently this function lacks the ability to grow the log file size since we pretty much lack the necessary code that deals with hive shrinking and log shrinking/growing as well. This part is not super critical for us so this shall be left as a TODO for future.
HvLoadHive -- Currently there's a hack that prevents us from refactoring this function in a proper way. That is, we should not be reading the whole and prepare the hive storage using HvpInitializeMemoryHive which is strictly used for HINIT_MEMORY but rather we must read the hive file block by block
and deconstruct the read buffer from the file so that we can get the bins that we read from the file. With the hive bins we got the hive storage will be prepared based on such bins. If one of the bins is corrupt, self healing is applied in such scenario.
For this matter, if in any case the hive we'll be reading is corrupt we could potentially read corrupt data and lead the system into failure. So we have to perform header and data recovery as well before reading the whole hive.
In addition to that, in some functions like CmFlushKey, CmSaveKey and CmSaveMergedKeys we must validate the underlying hives as a matter of precaution that everything is alright and we don't fuck all the shit up.
CmCheckRegistry is a function that provides the necessary validation checks for a registry hive. This function usually comes into action when logs have been replayed for example, or when a registry hive internals have changed such as when saving a key, loading a key, etc.
This commit implements the whole Check Registry infrastructure (cmcheck.c) in CMLIB library for ease of usage and wide accessibility across parts of the OS. In addition, two more functions for registry checks are also implemented -- HvValidateHive and HvValidateBin.
Instead of having the CmCheckRegistry implementation in the kernel, it's better to have it in the Configuration Manager library instead (aka CMLIB). The benefits of having it in the library are the following:
- CmCheckRegistry can be used in FreeLdr to fix the SYSTEM hive
- It can be used on-demand in the kernel
- It can be used for offline registry repair tools
- It makes the underlying CmCheckRegistry implementation code debug-able in user mode
CORE-9195
CORE-6762
This implements cmheal.c file which provides the basic registry self-heal infrastructure needed by the public CmCheckRegistry function. The infrastructure provides a range of various self-heal helpers for the hive, such as subkey, class, values and node healing functions.
Add these NTSTATUS codes in the CMLIB library. STATUS_INVALID_PARAMETER will be used mostly for HvInitialize function, STATUS_REGISTRY_IO_FAILED for whatever routines that deal with reading or writing into a hive file.
During a I/O failure of whatever kind the upper-level driver, namely a FSD, can raise a hard error and a deadlock can occur. We wouldn't want that to happen for particular files like hives or logs so in such cases we must disable hard errors before toying with hives until we're done.
In addition to that, annotate the CmpFileSetSize function's parameters with SAL.
When shutting down the registry of the system we don't want that the registry in question gets poked again, such as flushing the hives or syncing the hives and respective logs for example. The reasoning behind this is very simple, during a complete shutdown the system does final check-ups and stuff until the computer
shuts down.
Any writing operations done to the registry can lead to erratic behaviors. CmShutdownSystem call already invokes a final flushing of all the hives on the backing storage which is more than enough to ensure consistency of the last session configuration. So after that final flushing, mark HvShutdownComplete as TRUE indicating
that any eventual flushing or syncying (in the case where HvSyncHive gets called) request is outright ignored.
=== DOCUMENTATION REMARKS ===
HBOOT_TYPE_REGULAR and HBOOT_TYPE_SELF_HEAL are boot type values set up by the CMLIB library (for the BootType field respectively). HBOOT_TYPE_REGULAR indicates a normal system boot whereas HBOOT_TYPE_SELF_HEAL indicates the system boot is assisted within self healing mode.
Whether the former or the latter value is set it's governed by both the kernel and the bootloader. The bootloader and the kernel negotiate together to determine if any of the registry properties (the hive, the base block, the registry base, etc) are so severed from corruption or not. In extreme cases where
registry healing is possible, the specific base block of the damaged hive will have its flags marked with HBOOT_TYPE_SELF_HEAL. At this point the boot phase procedure is orchestrated since the boot phase no longer goes on the default path but it's assisted, as I have already said above.
HBOOT_NO_BOOT_RECOVER, HBOOT_BOOT_RECOVERED_BY_HIVE_LOG and HBOOT_BOOT_RECOVERED_BY_ALTERNATE_HIVE on the other hand are identifiers for the BootRecover field of the BASE_BLOCK header structure. These are used exclusively by FreeLdr to tell the kernel if the bootloader recovered the SYSTEM hive or not. In case where the bootloader did recover the SYSTEM hive,
the kernel will perform a flush request on the dirty data down to disk. The (almost) worse case FreeLdr could not repair the main hive by applying log data, it will load the alternate mirror version of the hive.
In addition to that, declare other miscellaneous CMLIB identifiers for log transaction writes purposes.
I checked: those are not present in german XPSP3 for those dlgs.
I noticed that subtle thing just by the fact that the de-DE.rc had one
less of those compared to all other languages.
I don't know why those were added, but it is like that since eternity already,
e.g. see ebc7599c6d from ancient 2008 SVN r36325 times had them already.
Use safer string functions of <strsafe.h>.
Use StringCbPrintf instead of _stprintf.
Use StringCbCopy insteaad of _tcscpy.
Use StringCbCat instead of _tcscat.
CORE-19306
Allow the user to turn off "Advanced Text Service".
[HKEY_CURRENT_USER\Software\Microsoft\CTF]
"Disable Thread Input Manager"=dword:00000001
Implement AdvancedSettingsPageProc procedure.
Modify IDS_REBOOT_NOW resource string.
CORE-19268
Reason: VS solution builds pass the compiler options to the assembler. These are usually ignored and result in a warning only, but ML of the latest VS supports /Gy (function level linking), but that requires all functions to be declared with "PROC" and otherwise results in an error.
- Add IMAGE_PART structure and use as history items.
- Overload ImageModel::PushImageForUndo(const RECT& rcPartial).
- Add ToolsModel::GetToolSize.
- Implement partial image history on TwoPointDrawTool.
CORE-19094
