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[NTOSKRNL]

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In MmDbgCopyMemory do physical memory copy, if the virtual target address is valid, but not writable. Fixes Step-Over on user mode addresses with WinDbg (can write break points now)

svn path=/trunk/; revision=52582
This commit is contained in:
Timo Kreuzer 2011-07-09 14:15:47 +00:00
parent 5bf3d7c1d8
commit b5eab2f965
1 changed files with 23 additions and 25 deletions
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48
reactos/ntoskrnl/mm/ARM3/mmdbg.c
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@ -150,6 +150,8 @@ MmDbgCopyMemory(IN ULONG64 Address,
{
NTSTATUS Status;
PVOID TargetAddress;
ULONG64 PhysicalAddress;
PMMPTE PointerPte;
//
// No local kernel debugging support yet, so don't worry about locking
@ -238,34 +240,30 @@ MmDbgCopyMemory(IN ULONG64 Address,
// No session space support yet
//
ASSERT(MmIsSessionAddress(TargetAddress) == FALSE);
}
//
// If we are going to write to the address then make sure it is writeable too
//
if ((Flags & MMDBG_COPY_WRITE) &&
(!MI_IS_PAGE_WRITEABLE(MiAddressToPte(TargetAddress))))
{
//
// Check if we mapped anything
//
if (Flags & MMDBG_COPY_PHYSICAL)
/* If we are going to write to the address, then check if its writable */
PointerPte = MiAddressToPte(TargetAddress);
if ((Flags & MMDBG_COPY_WRITE) && !MI_IS_PAGE_WRITEABLE(PointerPte))
{
//
// Get rid of the mapping
//
MiDbgUnTranslatePhysicalAddress();
}
/* Not writable, we need to do a physical copy */
Flags |= MMDBG_COPY_PHYSICAL;
//
// Fail
//
// FIXME: We should attempt to override the write protection instead of
// failing here
//
KdpDprintf("MmDbgCopyMemory: Failing Write for Protected Address 0x%p\n",
TargetAddress);
return STATUS_UNSUCCESSFUL;
/* Calculate the physical address */
PhysicalAddress = PointerPte->u.Hard.PageFrameNumber << PAGE_SHIFT;
PhysicalAddress += BYTE_OFFSET(Address);
/* Translate the physical address */
TargetAddress = MiDbgTranslatePhysicalAddress(PhysicalAddress, Flags);
/* Check if translation failed */
if (!TargetAddress)
{
/* Fail */
KdpDprintf("MmDbgCopyMemory: Failed to translate for write "
"%I64x (%I64x)\n", PhysicalAddress, Address);
return STATUS_UNSUCCESSFUL;
}
}
}
//