On ObpChargeQuotaForObject function, the kernel will either charge the default object type charges or the specified information charges obtained from ObCreateObject API call. What happens is that if a paged pool charge is specified on ObCreateObject call the kernel will charge that
but when an object is about to be de-allocated, the amount of quota to return back to the system is the amounting of the paged pool charge specified previously by the ObCreateObject call plus the amounting of the security descriptor charge (see oblife.c / line 98).
This will result in a fatal crash with a bugcheck of QUOTA_UNDERFLOW because we are returning quota with bits of it that was never charged and that's SecurityDescriptorCharge. A QUOTA_UNDERFLOW bugcheck occurs in two following scenarios:
-- When installing Virtualbox Guest Additions and prompting the installer to reboot the system for you
-- When logging off and on back to the system and then you restart the system normally
This bug has been discovered whilst working on #4555 PR.
We are allocating blocks of pool memory for a security descriptor with its own specific tag, TAG_SEC_QUERY, so just use it when freeing when releasing the descriptor as well (aka freeing the said pool).
As it currently stands the Object Manager doesn't charge any quotas when objects are created, nor it returns quotas when objects are de-allocated and freed from the objects namespace database. This alone can bring inconsistencies in the kernel as we simply don't know what is the amount charged in an object and thus we aren't keeping track of quotas flow.
Now with both PsReturnSharedPoolQuota and PsChargeSharedPoolQuota implemented, the Object Manager can now track the said flow of quotas every time an object is created or de-allocated, thus enforcing consistency with the use of quota resources.
We have a special file, tag.h, which serves as a place to store whatever kernel pool allocation tag yet we still have some tags sparse over the kernel code... So just re-group them in one unique place.
- NtQuerySymbolicLinkObject(): Use an intermediate variable for the object header.
- Simplify code in ObpLookupEntryDirectory() by calling ObpReleaseLookupContextObject() instead.
- Use TAG_OBJECT_TYPE instead of hardcoded tag values.
- Disentangle the usage of ObpAcquireDirectoryLockExclusive() when it's
used only for accessing a directory structure, or as part of a lookup
operation.
The Obp*DirectoryLock*() -- both shared and exclusive -- functions
are only for locking an OB directory, for reading or writing its
structure members.
When performing lookup operations (insertions/deletions of entries
within a directory), use a ObpAcquireLookupContextLock() function that
exclusively locks the directory and saves extra lock state, that can
be used by ObpReleaseLookupContextObject() for cleanup.
- Add documentation for these functions.
As of now the Object Manager private service, ObpCloseHandleTableEntry, looks for OBJ_PROTECT_CLOSE attribute if a handle should not be closed. However, in ObDuplicateObject if an attribute of OBJ_PROTECT_CLOSE is found as it's been filled to the caller (see L2466) this attribute is removed from the attributes list of the new handle and ObpAccessProtectCloseBit access is granted to the newly duplicated object handle.
With that being said ObpCloseHandleTableEntry indiscriminately closes the object handle albeit it shouldn't do so. As a matter of fact in Windows Server 2003 SP2 this service indeed checks for ObpAccessProtectCloseBit flag bit and if the condition is met then it returns STATUS_HANDLE_NOT_CLOSABLE as it should. Therefore we should do the same.
Now NtClose can properly warn the calling thread the object handle can't be closed which fixes a testcase failure within NtDuplicateObject NTDLL APITEST where this function gives handle close protection bit as requested by the caller.
- Change INIT_FUNCTION and INIT_SECTION to CODE_SEG("INIT") and DATA_SEG("INIT") respectively
- Remove INIT_FUNCTION from function prototypes
- Remove alloc_text pragma calls as they are not needed anymore
- Sync some INIT_FUNCTION with how they are used and what is already
specified in the headers.
Addendum to commit 85e5b5be (r49445).
- KdbpGetCommandLineSettings(): Remove INIT_FUNCTION.
Fix MSVC 2015 x86 custom build:
"...\ntoskrnl\kdbg\kdb.c(1699): error C2983: 'KdbpGetCommandLineSettings': all declarations must have an identical __declspec(code_seg(...))"
And may also fix obscure bugs when entering into the KDBG debugger.
This allows getting rid of the ?? hack in the kernel but this doesn't
allow enabling LUID device maps as ReactOS can no longer open a
session with them enabled. So, we must remain with device maps at
root
CORE-16114
So that they handle LUID mappings and process device maps.
Get rid of the ObpParseSymbolicLinkToIoDeviceObject helper and introduce a
new helper ObpProcessDosDeviceSymbolicLink that will do the same things
but also handle name creation/deletion as well as device map handling.
All this is based on previous code (hence the same comments :-)).
What's left to do now is to add support for device maps in ObpLookupObjectName
It is now able to set the newly created device map to any
process and will default to current process if none is provided.
It also sets system device map if no process is specified.
It also deferences existing device map in the process if needed.
Finaly, it will make the directory object permanant.
* Add an NDK header to define INIT_FUNCTION/INIT_SECTION globally
* Use _declspec(allocate(x)) and _declspec(code_seg(x)) on MSVC versions that support it
* Use INIT_FUNCTION on functions only and INIT_SECTION on data only (required by MSVC)
* Place INIT_FUNCTION before the return type (required by MSVC)
* Make sure declarations and implementations share the same modifiers (required by MSVC)
* Add a global linker option to suppress warnings about defined but unused INIT section
* Merge INIT section into .text in freeldr
- Rename ObDirectoryType to ObpDirectoryObjectType and remove it from NDK (this is not exported!)
- Rename ObSymbolicLinkType to ObpSymbolicLinkObjectType
- Remove duplicated ObpTypeObjectType from ob.h
