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Don't let page containing stack disappear when switching memory spaces
svn path=/trunk/; revision=4656
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74c0e6eb1c
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@ -218,6 +218,7 @@ MmDeleteVirtualMapping(struct _EPROCESS* Process,
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BOOL FreePage,
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BOOL* WasDirty,
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PHYSICAL_ADDRESS* PhysicalPage);
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VOID MmUpdatePageDir(PULONG LocalPageDir);
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#define MM_PAGE_CLEAN (0)
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#define MM_PAGE_DIRTY (1)
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@ -16,7 +16,7 @@
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* $Id: process.c,v 1.11 2002/09/08 10:23:29 chorns Exp $
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/* $Id: process.c,v 1.12 2003/05/07 21:41:03 gvg Exp $
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*
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* PROJECT: ReactOS kernel
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* FILE: ntoskrnl/ke/process.c
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@ -44,6 +44,7 @@ KeAttachProcess (PEPROCESS Process)
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{
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KIRQL oldlvl;
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PETHREAD CurrentThread;
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PULONG AttachedProcessPageDir;
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ULONG PageDir;
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DPRINT("KeAttachProcess(Process %x)\n",Process);
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@ -58,9 +59,22 @@ KeAttachProcess (PEPROCESS Process)
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KeRaiseIrql(DISPATCH_LEVEL, &oldlvl);
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/* The stack of the current process may be located in a page which is
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not present in the page directory of the process we're attaching to.
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That would lead to a page fault when this function returns. However,
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since the processor can't call the page fault handler 'cause it can't
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push EIP on the stack, this will show up as a stack fault which will
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crash the entire system.
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To prevent this, make sure the page directory of the process we're
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attaching to is up-to-date. */
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AttachedProcessPageDir = ExAllocatePageWithPhysPage(Process->Pcb.DirectoryTableBase);
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MmUpdatePageDir(AttachedProcessPageDir);
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ExUnmapPage(AttachedProcessPageDir);
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CurrentThread->OldProcess = PsGetCurrentProcess();
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CurrentThread->ThreadsProcess = Process;
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PageDir = CurrentThread->ThreadsProcess->Pcb.DirectoryTableBase.u.LowPart;
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PageDir = Process->Pcb.DirectoryTableBase.u.LowPart;
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DPRINT("Switching process context to %x\n",PageDir)
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__asm__("movl %0,%%cr3\n\t"
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: /* no inputs */
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@ -16,7 +16,7 @@
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* $Id: page.c,v 1.47 2002/11/05 21:13:15 dwelch Exp $
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/* $Id: page.c,v 1.48 2003/05/07 21:41:03 gvg Exp $
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*
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* PROJECT: ReactOS kernel
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* FILE: ntoskrnl/mm/i386/page.c
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@ -1213,4 +1213,23 @@ MmGetPhysicalAddress(PVOID vaddr)
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}
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VOID
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MmUpdatePageDir(PULONG LocalPageDir)
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{
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unsigned Entry;
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for (Entry = ADDR_TO_PDE_OFFSET(KERNEL_BASE);
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Entry < PAGE_SIZE / sizeof(LONG);
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Entry++)
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{
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/* Skip the page directory */
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if (ADDR_TO_PDE_OFFSET(PAGETABLE_MAP) != Entry &&
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0 == LocalPageDir[Entry] &&
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0 != MmGlobalKernelPageDirectory[Entry])
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{
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LocalPageDir[Entry] = MmGlobalKernelPageDirectory[Entry];
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}
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}
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}
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/* EOF */
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