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[NTOS:MM] Use image prefix in MmLoadSystemImage

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MmLoadSystemImage has a PUNICODE_STRING NamePrefix parameter which is
currently unused in ReactOS. When the kernel loads the crash dump
storage stack drivers, the drivers will be loaded with MmLoadSystemImage
with a "dump_" or "hiber_" (for hibernation, which uses crash dump
stack too) prefix. This change adds in the prefix support, and is
supposed to push crash dump support forward.

CORE-376
This commit is contained in:
Wu Haotian 2023-01-09 22:55:29 +08:00 committed by Victor Perevertkin
parent 543d390259
commit 346477fb3c
1 changed files with 49 additions and 4 deletions
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53
ntoskrnl/mm/ARM3/sysldr.c
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@ -2900,7 +2900,7 @@ MmLoadSystemImage(IN PUNICODE_STRING FileName,
ULONG EntrySize, DriverSize;
PLOAD_IMPORTS LoadedImports = MM_SYSLDR_NO_IMPORTS;
PCHAR MissingApiName, Buffer;
PWCHAR MissingDriverName;
PWCHAR MissingDriverName, PrefixedBuffer = NULL;
HANDLE SectionHandle;
ACCESS_MASK DesiredAccess;
PSECTION Section = NULL;
@ -2964,7 +2964,52 @@ MmLoadSystemImage(IN PUNICODE_STRING FileName,
PrefixName = *FileName;
/* Check if we have a prefix */
if (NamePrefix) DPRINT1("Prefixed images are not yet supported!\n");
if (NamePrefix)
{
/* Check if "directory + prefix" is too long for the string */
Status = RtlUShortAdd(BaseDirectory.Length,
NamePrefix->Length,
&PrefixName.MaximumLength);
if (!NT_SUCCESS(Status))
{
Status = STATUS_INVALID_PARAMETER;
goto Quickie;
}
/* Check if "directory + prefix + basename" is too long for the string */
Status = RtlUShortAdd(PrefixName.MaximumLength,
BaseName.Length,
&PrefixName.MaximumLength);
if (!NT_SUCCESS(Status))
{
Status = STATUS_INVALID_PARAMETER;
goto Quickie;
}
/* Allocate the buffer exclusively used for prefixed name */
PrefixedBuffer = ExAllocatePoolWithTag(PagedPool,
PrefixName.MaximumLength,
TAG_LDR_WSTR);
if (!PrefixedBuffer)
{
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Quickie;
}
/* Clear out the prefixed name string */
PrefixName.Buffer = PrefixedBuffer;
PrefixName.Length = 0;
/* Concatenate the strings */
RtlAppendUnicodeStringToString(&PrefixName, &BaseDirectory);
RtlAppendUnicodeStringToString(&PrefixName, NamePrefix);
RtlAppendUnicodeStringToString(&PrefixName, &BaseName);
/* Now the base name of the image becomes the prefixed version */
BaseName.Buffer = &(PrefixName.Buffer[BaseDirectory.Length / sizeof(WCHAR)]);
BaseName.Length += NamePrefix->Length;
BaseName.MaximumLength = (PrefixName.MaximumLength - BaseDirectory.Length);
}
/* Check if we already have a name, use it instead */
if (LoadedName) BaseName = *LoadedName;
@ -3406,8 +3451,8 @@ Quickie:
/* If we have a file handle, close it */
if (FileHandle) ZwClose(FileHandle);
/* Check if we had a prefix (not supported yet - PrefixName == *FileName now) */
/* if (NamePrefix) ExFreePool(PrefixName.Buffer); */
/* If we have allocated a prefixed name buffer, free it */
if (PrefixedBuffer) ExFreePoolWithTag(PrefixedBuffer, TAG_LDR_WSTR);
/* Free the name buffer and return status */
ExFreePoolWithTag(Buffer, TAG_LDR_WSTR);