/* * PROJECT: ReactOS Kernel * LICENSE: GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later) * PURPOSE: Configuration Manager Library - Registry Self-Heal Routines * COPYRIGHT: Copyright 2022 George Bișoc */ #include "cmlib.h" #define NDEBUG #include /* GLOBALS ********************************************************************/ #if !defined(CMLIB_HOST) && !defined(_BLDR_) extern BOOLEAN CmpSelfHeal; extern ULONG CmpBootType; #endif /* PRIVATE FUNCTIONS **********************************************************/ /** * @brief * Removes a cell from a fast key index. * * @param[in,out] FastIndex * The fast key index where a cell has to be removed. * * @param[in] Index * The index which points to the location of the * cell that is to be removed. * * @param[in] UpdateCount * If set to TRUE, the function will update the fast * index count accordingly by one value less. If set * to FALSE, the count won't be updated. See Remarks * for further information. * * @remarks * In case where the fast index count is not updated is * when the key index is not a root but a leaf. In such * scenario such leaf is the actual key index itself * so updating the fast index count is not necessary (aka * UpdateCount is set to FALSE). */ static VOID CmpRemoveFastIndexKeyCell( _Inout_ PCM_KEY_FAST_INDEX FastIndex, _In_ ULONG Index, _In_ BOOLEAN UpdateCount) { ULONG MoveCount; ASSERT(Index < FastIndex->Count); /* Calculate the number of trailing cells */ MoveCount = FastIndex->Count - Index - 1; if (MoveCount != 0) { /* Remove the cell now by moving one location ahead */ RtlMoveMemory(&FastIndex->List[Index], &FastIndex->List[Index + 1], MoveCount * sizeof(CM_INDEX)); } /* Update the fast index count if asked */ if (UpdateCount) FastIndex->Count--; } /** * @brief * Removes a cell from a normal key index. * * @param[in,out] KeyIndex * The key index where a cell has to be removed. * * @param[in] Index * The index which points to the location of the * cell that is to be removed. */ static VOID CmpRemoveIndexKeyCell( _Inout_ PCM_KEY_INDEX KeyIndex, _In_ ULONG Index) { ULONG MoveCount; ASSERT(Index < KeyIndex->Count); /* Calculate the number of trailing cells */ MoveCount = KeyIndex->Count - Index - 1; if (MoveCount != 0) { /* Remove the cell now by moving one location ahead */ RtlMoveMemory(&KeyIndex->List[Index], &KeyIndex->List[Index + 1], MoveCount * sizeof(HCELL_INDEX)); } /* Update the key index count */ KeyIndex->Count--; } /** * @brief * Removes a cell from a key value list node. * * @param[in,out] ValueListNode * The value list node which is used by the * function to update the value list count. * * @param[in,out] ValueListData * The value list data of which a cell has to be removed. * * @param[in] Index * The index which points to the location of the * cell that is to be removed. */ static VOID CmpRemoveValueFromValueList( _Inout_ PCM_KEY_NODE ValueListNode, _Inout_ PCELL_DATA ValueListData, _In_ ULONG Index) { ULONG MoveCount; ASSERT(Index < ValueListNode->ValueList.Count); /* Calculate the number of trailing values */ MoveCount = ValueListNode->ValueList.Count - Index - 1; if (MoveCount != 0) { /* Remove the value now by moving one location ahead */ RtlMoveMemory(&ValueListData->u.KeyList[Index], &ValueListData->u.KeyList[Index + 1], MoveCount * sizeof(HCELL_INDEX)); } /* Update the value list count */ ValueListNode->ValueList.Count--; } /** * @brief * Removes the offending subkey from a root index. * * @param[in] Hive * A pointer to a hive descriptor containing faulty data. * * @param[in] RootIndex * The root index where a leaf is obtained from. Such * leaf is used to check deep down the leaf for the offending * subkey. * * @param[in] TargetKey * The offending target subkey to be removed. * * @return * Returns TRUE if the function successfully removed the target * key, FALSE otherwise. */ static BOOLEAN CmpRemoveSubkeyInRoot( _In_ PHHIVE Hive, _In_ PCM_KEY_INDEX RootIndex, _In_ HCELL_INDEX TargetKey) { PCM_KEY_INDEX Leaf; PCM_KEY_FAST_INDEX FastIndex; HCELL_INDEX LeafCell; ULONG RootCountIndex; ULONG LeafCountIndex; PAGED_CODE(); ASSERT(RootIndex); /* Loop the root index */ for (RootCountIndex = 0; RootCountIndex < RootIndex->Count; RootCountIndex++) { /* * Release the leaf cell from previous iteration * of the loop. Make sure what we're releasing is * valid to begin with. */ if (RootCountIndex) { ASSERT(Leaf); ASSERT(LeafCell == RootIndex->List[RootCountIndex - 1]); HvReleaseCell(Hive, LeafCell); } /* Get the leaf cell and the leaf for this index */ LeafCell = RootIndex->List[RootCountIndex]; Leaf = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell); if (!Leaf) { DPRINT1("Couldn't get the leaf from cell\n"); return FALSE; } /* Start looping the leaf */ for (LeafCountIndex = 0; LeafCountIndex < Leaf->Count; LeafCountIndex++) { /* Is the leaf a fast leaf or a hash one? */ if ((Leaf->Signature == CM_KEY_FAST_LEAF) || (Leaf->Signature == CM_KEY_HASH_LEAF)) { /* It is one of the two, get the fast index */ FastIndex = (PCM_KEY_FAST_INDEX)Leaf; /* * Is the subkey cell from the fast * index the one we one we're actually * searching? */ if (FastIndex->List[LeafCountIndex].Cell == TargetKey) { HvReleaseCell(Hive, LeafCell); HvMarkCellDirty(Hive, LeafCell, FALSE); CmpRemoveFastIndexKeyCell(FastIndex, LeafCountIndex, TRUE); DPRINT1("The offending key cell has BEEN FOUND in fast index (fast index 0x%p, index %u)\n", FastIndex, LeafCountIndex); return TRUE; } } else { /* * The leaf is neither of the two. Check if * the target offending cell is inside the leaf * itself. */ if (Leaf->List[LeafCountIndex] == TargetKey) { HvReleaseCell(Hive, LeafCell); HvMarkCellDirty(Hive, LeafCell, FALSE); CmpRemoveIndexKeyCell(Leaf, LeafCountIndex); DPRINT1("The offending key cell has BEEN FOUND in leaf (leaf 0x%p, index %u)\n", Leaf, LeafCountIndex); return TRUE; } } } } /* * We have searched everywhere but we couldn't * hunt the offending target key cell. */ DPRINT1("No target key has been found to remove\n"); return FALSE; } /** * @brief * Removes the offending subkey from a leaf index. * * @param[in] Hive * A pointer to a hive descriptor containing faulty data. * * @param[in] KeyNode * A pointer to a key node of the parent. This node is * used by the function to mark the whole subkeys list * of the parent dirty. * * @param[in] Leaf * A pointer to a leaf key index of which the offending * subkey is to be removed from. * * @param[in] TargetKey * The offending target subkey to remove. * * @return * Returns TRUE if the function successfully removed the target * key, FALSE otherwise. */ static BOOLEAN CmpRemoveSubKeyInLeaf( _In_ PHHIVE Hive, _In_ PCM_KEY_NODE KeyNode, _In_ PCM_KEY_INDEX Leaf, _In_ HCELL_INDEX TargetKey) { PCM_KEY_FAST_INDEX FastIndex; ULONG LeafIndex; /* Loop the leaf index */ for (LeafIndex = 0; LeafIndex < Leaf->Count; LeafIndex++) { /* * Check if the main leaf is a fast * leaf or a hash one. */ if ((Leaf->Signature == CM_KEY_FAST_LEAF) || (Leaf->Signature == CM_KEY_HASH_LEAF)) { /* It is one of the two, get the fast index */ FastIndex = (PCM_KEY_FAST_INDEX)Leaf; /* * Is the subkey cell from the fast * index the one we're actually * searching? */ if (FastIndex->List[LeafIndex].Cell == TargetKey) { HvMarkCellDirty(Hive, KeyNode->SubKeyLists[Stable], FALSE); CmpRemoveFastIndexKeyCell(FastIndex, LeafIndex, FALSE); /* * Since this fast index actually came from the * actual leaf index itself, just update its count * rather than that of the fast index. */ Leaf->Count--; DPRINT1("The offending key cell has BEEN FOUND in fast index (fast index 0x%p, leaf index %u)\n", FastIndex, LeafIndex); return TRUE; } } else { /* * The leaf is neither of the two. The offending * cell must come directly from the normal leaf * at this point. */ if (Leaf->List[LeafIndex] == TargetKey) { HvMarkCellDirty(Hive, KeyNode->SubKeyLists[Stable], FALSE); CmpRemoveIndexKeyCell(Leaf, LeafIndex); DPRINT1("The offending key cell has BEEN FOUND in leaf (leaf 0x%p, index %u)\n", Leaf, LeafIndex); return TRUE; } } } /* * We have searched everywhere but we couldn't * hunt the offending target key cell. */ DPRINT1("No target key has been found to remove\n"); return FALSE; } /* PUBLIC FUNCTIONS ***********************************************************/ /** * @brief * Checks if self healing is permitted by the kernel and/or * bootloader. Self healing is also triggered if such a * request was prompted by the user to fix a broken hive. * Such a request tipically comes from a registry repair * tool such as the ReactOS Check Registry Utility. * * @param[in] FixHive * If set to TRUE, self heal is triggered and the target * hive will be fixed. Otherwise the hive will not be fixed. * * @return * Returns TRUE if self healing is possible, FALSE otherwise. */ BOOLEAN CMAPI CmIsSelfHealEnabled( _In_ BOOLEAN FixHive) { PAGED_CODE(); if (FixHive) return TRUE; #if !defined(CMLIB_HOST) && !defined(_BLDR_) if (CmpSelfHeal || (CmpBootType & HBOOT_TYPE_SELF_HEAL)) return TRUE; #endif return FALSE; } /** * @brief * Repairs the parent key from damage by removing the * offending subkey cell. * * @param[in,out] Hive * A pointer to a hive descriptor containing faulty data. * * @param[in] TargetKey * The offending target cell to remove from the parent. * * @param[in] ParentKey * The damaged parent key cell to heal. * * @param[in] FixHive * If set to TRUE, self heal is triggered and the target * hive will be fixed. Otherwise the hive will not be fixed. * * @return * Returns TRUE if the function successfully healed the parent * key, FALSE otherwise. */ BOOLEAN CMAPI CmpRepairParentKey( _Inout_ PHHIVE Hive, _In_ HCELL_INDEX TargetKey, _In_ HCELL_INDEX ParentKey, _In_ BOOLEAN FixHive) { PCM_KEY_INDEX KeyIndex; PCM_KEY_NODE KeyNode; BOOLEAN ParentRepaired; PAGED_CODE(); /* The target key must NEVER be NIL! */ ASSERT(TargetKey != HCELL_NIL); /* Assume the parent hasn't been repaired yet */ ParentRepaired = FALSE; /* Is self healing possible? */ if (!CmIsSelfHealEnabled(FixHive)) { DPRINT1("Self healing not possible\n"); return ParentRepaired; } /* Obtain a node from the parent */ KeyNode = (PCM_KEY_NODE)HvGetCell(Hive, ParentKey); if (!KeyNode) { DPRINT1("Couldn't get the parent key node\n"); return ParentRepaired; } /* Obtain the index as well since we got the parent node */ KeyIndex = (PCM_KEY_INDEX)HvGetCell(Hive, KeyNode->SubKeyLists[Stable]); if (!KeyIndex) { DPRINT1("Couldn't get the key index from parent node\n"); HvReleaseCell(Hive, ParentKey); return ParentRepaired; } /* Check if this is a root */ if (KeyIndex->Signature == CM_KEY_INDEX_ROOT) { /* It is, call the specific helper to discard the damaged key down the root */ ParentRepaired = CmpRemoveSubkeyInRoot(Hive, KeyIndex, TargetKey); } else if ((KeyIndex->Signature == CM_KEY_INDEX_LEAF) || (KeyIndex->Signature == CM_KEY_FAST_LEAF) || (KeyIndex->Signature == CM_KEY_HASH_LEAF)) { /* Otherwise call the leaf helper */ ParentRepaired = CmpRemoveSubKeyInLeaf(Hive, KeyNode, KeyIndex, TargetKey); } else { /* * Generally CmCheckRegistry detects if a key index * in the subkeys list is totally broken (we understand * that if its signature is not root or leaf) and it will * purge the whole subkeys list in such cases. With that * being said, we should never reach this code path. But * if for whatever reason we reach here then something * is seriously wrong. */ DPRINT1("The key index signature is invalid (KeyIndex->Signature == %u)", KeyIndex->Signature); ASSERT(FALSE); } /* * If we successfully removed the offending key * cell mark down the parent as dirty and punt down * the subkey count as well. Mark the hive as in * self heal mode as well. */ if (ParentRepaired) { HvMarkCellDirty(Hive, ParentKey, FALSE); KeyNode->SubKeyCounts[Stable]--; Hive->BaseBlock->BootType |= HBOOT_TYPE_SELF_HEAL; DPRINT1("The subkey has been removed, the parent is now repaired\n"); } HvReleaseCell(Hive, KeyNode->SubKeyLists[Stable]); HvReleaseCell(Hive, ParentKey); return ParentRepaired; } /** * @brief * Repairs the parent of the node from damage due * to parent cell and parent node incosistency. * * @param[in,out] Hive * A pointer to a hive descriptor containing faulty data. * * @param[in] CurrentCell * The current cell to be marked as dirty. * * @param[in] ParentCell * The sane parent cell which is used by the * function for new parent node assignment. * * @param[in,out] CellData * The cell data of the current cell of which * its parent node is to be repaired. * * @param[in] FixHive * If set to TRUE, self heal is triggered and the target * hive will be fixed. Otherwise the hive will not be fixed. * * @return * Returns TRUE if the function successfully healed the * parent node, FALSE otherwise. */ BOOLEAN CMAPI CmpRepairParentNode( _Inout_ PHHIVE Hive, _In_ HCELL_INDEX CurrentCell, _In_ HCELL_INDEX ParentCell, _Inout_ PCELL_DATA CellData, _In_ BOOLEAN FixHive) { PAGED_CODE(); /* Is self healing possible? */ if (!CmIsSelfHealEnabled(FixHive)) { DPRINT1("Self healing not possible\n"); return FALSE; } /* * Mark the cell where we got the actual * cell data as dirty and fix the node. */ HvMarkCellDirty(Hive, CurrentCell, FALSE); CellData->u.KeyNode.Parent = ParentCell; /* Mark the hive as in self healing mode since we repaired it */ Hive->BaseBlock->BootType |= HBOOT_TYPE_SELF_HEAL; return TRUE; } /** * @brief * Repairs the key node signature from damage * due to signature corruption. * * @param[in,out] Hive * A pointer to a hive descriptor containing faulty data. * * @param[in] CurrentCell * The current cell to be marked as dirty. * * @param[in,out] CellData * The cell data of the current cell of which * its signature is to be repaired. * * @param[in] FixHive * If set to TRUE, self heal is triggered and the target * hive will be fixed. Otherwise the hive will not be fixed. * * @return * Returns TRUE if the function successfully healed the * key node signature, FALSE otherwise. */ BOOLEAN CMAPI CmpRepairKeyNodeSignature( _Inout_ PHHIVE Hive, _In_ HCELL_INDEX CurrentCell, _Inout_ PCELL_DATA CellData, _In_ BOOLEAN FixHive) { PAGED_CODE(); /* Is self healing possible? */ if (!CmIsSelfHealEnabled(FixHive)) { DPRINT1("Self healing not possible\n"); return FALSE; } /* * Mark the cell where we got the actual * cell data as dirty and fix the key signature. */ HvMarkCellDirty(Hive, CurrentCell, FALSE); CellData->u.KeyNode.Signature = CM_KEY_NODE_SIGNATURE; /* Mark the hive as in self healing mode since we repaired it */ Hive->BaseBlock->BootType |= HBOOT_TYPE_SELF_HEAL; return TRUE; } /** * @brief * Repairs the class from damage due to class * corruption within the node key. * * @param[in,out] Hive * A pointer to a hive descriptor containing faulty data. * * @param[in] CurrentCell * The current cell to be marked as dirty. * * @param[in,out] CellData * The cell data of the current cell of which * its class is to be repaired. * * @param[in] FixHive * If set to TRUE, self heal is triggered and the target * hive will be fixed. Otherwise the hive will not be fixed. * * @return * Returns TRUE if the function successfully healed the * class of node key, FALSE otherwise. */ BOOLEAN CMAPI CmpRepairClassOfNodeKey( _Inout_ PHHIVE Hive, _In_ HCELL_INDEX CurrentCell, _Inout_ PCELL_DATA CellData, _In_ BOOLEAN FixHive) { PAGED_CODE(); /* Is self healing possible? */ if (!CmIsSelfHealEnabled(FixHive)) { DPRINT1("Self healing not possible\n"); return FALSE; } /* * Mark the cell where we got the actual * cell data as dirty and fix the class field * of key node. */ HvMarkCellDirty(Hive, CurrentCell, FALSE); CellData->u.KeyNode.Class = HCELL_NIL; CellData->u.KeyNode.ClassLength = 0; /* Mark the hive as in self healing mode since we repaired it */ Hive->BaseBlock->BootType |= HBOOT_TYPE_SELF_HEAL; return TRUE; } /** * @brief * Repairs the value list count of key due to * corruption. The process involves by removing * one damaged value less from the list. * * @param[in,out] Hive * A pointer to a hive descriptor containing faulty data. * * @param[in] CurrentCell * The current cell to be marked as dirty. * * @param[in] ListCountIndex * The value count index which points to the actual * value in the list to be removed. * * @param[in,out] ValueListData * The value list cell data containing the actual list * of which the damaged is to be removed from. * * @param[in] FixHive * If set to TRUE, self heal is triggered and the target * hive will be fixed. Otherwise the hive will not be fixed. * * @return * Returns TRUE if the function successfully healed the * value list count, FALSE otherwise. */ BOOLEAN CMAPI CmpRepairValueListCount( _Inout_ PHHIVE Hive, _In_ HCELL_INDEX CurrentCell, _In_ ULONG ListCountIndex, _Inout_ PCELL_DATA ValueListData, _In_ BOOLEAN FixHive) { PCM_KEY_NODE ValueListNode; PAGED_CODE(); /* Is self healing possible? */ if (!CmIsSelfHealEnabled(FixHive)) { DPRINT1("Self healing not possible\n"); return FALSE; } /* * Obtain a node from the cell that we mark it as dirty. * The node is that of the current cell of which its * value list is being validated. */ ValueListNode = (PCM_KEY_NODE)HvGetCell(Hive, CurrentCell); if (!ValueListNode) { DPRINT1("Could not get a node from the current cell\n"); return FALSE; } /* * Mark the current cell and value list as dirty * as we will be making changes onto them. */ HvMarkCellDirty(Hive, CurrentCell, FALSE); HvMarkCellDirty(Hive, ValueListNode->ValueList.List, FALSE); /* * Now remove the value from the list and mark the * hive as in self healing mode. */ CmpRemoveValueFromValueList(ValueListNode, ValueListData, ListCountIndex); Hive->BaseBlock->BootType |= HBOOT_TYPE_SELF_HEAL; HvReleaseCell(Hive, CurrentCell); return TRUE; } /** * @brief * Repairs the value list due to corruption. The * process involes by purging the whole damaged * list. * * @param[in,out] Hive * A pointer to a hive descriptor containing faulty data. * * @param[in] CurrentCell * The current cell to be marked as dirty. * * @param[in] FixHive * If set to TRUE, self heal is triggered and the target * hive will be fixed. Otherwise the hive will not be fixed. * * @return * Returns TRUE if the function successfully healed the * value list, FALSE otherwise. */ BOOLEAN CMAPI CmpRepairValueList( _Inout_ PHHIVE Hive, _In_ HCELL_INDEX CurrentCell, _In_ BOOLEAN FixHive) { PCM_KEY_NODE ValueListNode; PAGED_CODE(); /* Is self healing possible? */ if (!CmIsSelfHealEnabled(FixHive)) { DPRINT1("Self healing not possible\n"); return FALSE; } /* Obtain a node */ ValueListNode = (PCM_KEY_NODE)HvGetCell(Hive, CurrentCell); if (!ValueListNode) { DPRINT1("Could not get a node from the current cell\n"); return FALSE; } /* Purge out the whole list */ HvMarkCellDirty(Hive, CurrentCell, FALSE); ValueListNode->ValueList.List = HCELL_NIL; ValueListNode->ValueList.Count = 0; Hive->BaseBlock->BootType |= HBOOT_TYPE_SELF_HEAL; HvReleaseCell(Hive, CurrentCell); return TRUE; } /** * @brief * Repairs the subkey list count due to corruption. * The process involves by fixing the count itself * with a sane count. * * @param[in,out] Hive * A pointer to a hive descriptor containing faulty data. * * @param[in] CurrentCell * The current cell to be marked as dirty. * * @param[in] Count * The healthy count which is used by the function * to fix the subkeys list count. * * @param[in,out] CellData * The cell data of the current cell of which its * subkeys list is to be fixed. * * @param[in] FixHive * If set to TRUE, self heal is triggered and the target * hive will be fixed. Otherwise the hive will not be fixed. * * @return * Returns TRUE if the function successfully healed the * subkeys list count, FALSE otherwise. */ BOOLEAN CMAPI CmpRepairSubKeyCounts( _Inout_ PHHIVE Hive, _In_ HCELL_INDEX CurrentCell, _In_ ULONG Count, _Inout_ PCELL_DATA CellData, _In_ BOOLEAN FixHive) { PAGED_CODE(); /* Is self healing possible? */ if (!CmIsSelfHealEnabled(FixHive)) { DPRINT1("Self healing not possible\n"); return FALSE; } /* * Mark the cell where we got the actual * cell data as dirty and fix the subkey * counts. */ HvMarkCellDirty(Hive, CurrentCell, FALSE); CellData->u.KeyNode.SubKeyCounts[Stable] = Count; /* Mark the hive as in self healing mode since we repaired it */ Hive->BaseBlock->BootType |= HBOOT_TYPE_SELF_HEAL; return TRUE; } /** * @brief * Repairs the subkey list due to corruption. The process * involves by purging the whole damaged subkeys list. * * @param[in,out] Hive * A pointer to a hive descriptor containing faulty data. * * @param[in] CurrentCell * The current cell to be marked as dirty. * * @param[in,out] CellData * The cell data of the current cell of which its * subkeys list is to be fixed. * * @param[in] FixHive * If set to TRUE, self heal is triggered and the target * hive will be fixed. Otherwise the hive will not be fixed. * * @return * Returns TRUE if the function successfully healed the * subkeys list, FALSE otherwise. */ BOOLEAN CMAPI CmpRepairSubKeyList( _Inout_ PHHIVE Hive, _In_ HCELL_INDEX CurrentCell, _Inout_ PCELL_DATA CellData, _In_ BOOLEAN FixHive) { PAGED_CODE(); /* Is self healing possible? */ if (!CmIsSelfHealEnabled(FixHive)) { DPRINT1("Self healing not possible\n"); return FALSE; } /* * Mark the cell where we got the actual * cell data as dirty and fix the subkey * list. */ HvMarkCellDirty(Hive, CurrentCell, FALSE); CellData->u.KeyNode.SubKeyLists[Stable] = HCELL_NIL; CellData->u.KeyNode.SubKeyCounts[Stable] = 0; /* Mark the hive as in self healing mode since we repaired it */ Hive->BaseBlock->BootType |= HBOOT_TYPE_SELF_HEAL; return TRUE; } /* EOF */