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EmuVariable: enable deletion of variables

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Make it possible to delete a variable by appending it with
size 0. Also ignore keysizes of 0 when reading variables.

Signed-off-by: Jeremy Soller <jeremy@system76.com>
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
This commit is contained in:
Jeremy Soller
2019-10-02 16:01:00 -06:00
committed by Matt DeVillier
parent 4f60b6a439
commit 1b66efff52
1 changed files with 30 additions and 9 deletions
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33
MdeModulePkg/Universal/Variable/EmuRuntimeDxe/EmuVariable.c
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@@ -945,6 +945,7 @@ UpdateVariable (
VARIABLE_GLOBAL *Global;
UINTN NonVolatileVarableStoreSize;
UINT32 Result;
BOOLEAN Delete = FALSE;
Global = &mVariableModuleGlobal->VariableGlobal[Physical];
@@ -977,10 +978,8 @@ UpdateVariable (
// specified causes it to be deleted.
//
if (DataSize == 0 || (Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == 0) {
Variable->CurrPtr->State &= VAR_DELETED;
UpdateVariableInfo (VariableName, VendorGuid, Variable->Volatile, FALSE, FALSE, TRUE, FALSE);
Status = EFI_SUCCESS;
goto Done;
DataSize = 0;
Delete = TRUE;
}
//
@@ -990,8 +989,12 @@ UpdateVariable (
if (Variable->CurrPtr->DataSize == DataSize &&
CompareMem (Data, GetVariableDataPtr (Variable->CurrPtr), DataSize) == 0
) {
if (Delete) {
goto Update;
} else {
Status = EFI_SUCCESS;
goto Done;
}
} else if (Variable->CurrPtr->State == VAR_ADDED) {
//
// Mark the old variable as in delete transition
@@ -1033,6 +1036,10 @@ UpdateVariable (
VarDataOffset = VarNameOffset + VarNameSize + GET_PAD_SIZE (VarNameSize);
VarSize = VarDataOffset + DataSize + GET_PAD_SIZE (DataSize);
if (Delete) {
goto Store;
}
if ((Attributes & EFI_VARIABLE_NON_VOLATILE) != 0) {
NonVolatileVarableStoreSize = ((VARIABLE_STORE_HEADER *)(UINTN)(Global->NonVolatileVariableBase))->Size;
if ((((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != 0)
@@ -1090,7 +1097,16 @@ UpdateVariable (
DataSize
);
if (storeInitialized && ((Attributes & EFI_VARIABLE_NON_VOLATILE) != 0)) {
Store:
// If the store is initialized
// And we are storing or deleting a non volatile variable
// Send the new data to SMMSTORE
if (storeInitialized && (
(Attributes & EFI_VARIABLE_NON_VOLATILE) != 0 || (
Delete &&
(Variable->CurrPtr->Attributes & EFI_VARIABLE_NON_VOLATILE) != 0
)
)) {
/* TODO: add hook for logging nv changes here */
@@ -1120,6 +1136,7 @@ UpdateVariable (
*/
}
Update:
//
// Mark the old variable as deleted
//
@@ -1127,7 +1144,11 @@ UpdateVariable (
Variable->CurrPtr->State &= VAR_DELETED;
}
if (Delete) {
UpdateVariableInfo (VariableName, VendorGuid, Variable->Volatile, FALSE, FALSE, TRUE, FALSE);
} else {
UpdateVariableInfo (VariableName, VendorGuid, Variable->Volatile, FALSE, TRUE, FALSE, FALSE);
}
Status = EFI_SUCCESS;
@@ -1943,7 +1964,7 @@ VariableCommonInitialize (
while (i < read_cmd.bufsize) {
// assume native endian
UINT32 keysz = ((UINT32 *)(buf + i))[0];
if (keysz == 0xffffffff)
if (keysz == 0 || keysz == 0xffffffff)
break; // no more entries
UINTN valsz = ((UINT32 *)(buf + i))[1];