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- Establish the pde for the thread structure within the process

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before a switch to the process occurs.

svn path=/trunk/; revision=10704
This commit is contained in:
Hartmut Birr 2004-08-27 10:24:04 +00:00
parent aa00673d45
commit 16a24538c2
2 changed files with 17 additions and 8 deletions
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10
reactos/ntoskrnl/ke/kthread.c
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@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: kthread.c,v 1.51 2004/08/21 21:09:39 tamlin Exp $
/* $Id: kthread.c,v 1.52 2004/08/27 10:24:04 hbirr Exp $
*
* FILE: ntoskrnl/ke/kthread.c
* PURPOSE: Microkernel thread support
@ -188,8 +188,16 @@ KeInitializeThread(PKPROCESS Process, PKTHREAD Thread, BOOLEAN First)
Thread->StackLimit = (ULONG)&init_stack;
Thread->KernelStack = (PVOID)&init_stack_top;
}
/*
* Establish the pde's for the new stack and the thread structure within the
* address space of the new process. They are accessed while taskswitching or
* while handling page faults. At this point it isn't possible to call the
* page fault handler for the missing pde's.
*/
MmUpdatePageDir((PEPROCESS)Process, (PVOID)Thread->StackLimit, MM_STACK_SIZE);
MmUpdatePageDir((PEPROCESS)Process, (PVOID)Thread, sizeof(ETHREAD));
/*
* The Native API function will initialize the TEB field later

15
reactos/ntoskrnl/ke/process.c
View file

@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: process.c,v 1.25 2004/08/21 21:19:06 tamlin Exp $
/* $Id: process.c,v 1.26 2004/08/27 10:24:04 hbirr Exp $
*
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/ke/process.c
@ -55,16 +55,17 @@ KeAttachProcess (PEPROCESS Process)
KEBUGCHECK(INVALID_PROCESS_ATTACH_ATTEMPT);
}
/* The stack of the current process may be located in a page which is
not present in the page directory of the process we're attaching to.
That would lead to a page fault when this function returns. However,
since the processor can't call the page fault handler 'cause it can't
push EIP on the stack, this will show up as a stack fault which will
crash the entire system.
/* The stack and the thread structure of the current process may be
located in a page which is not present in the page directory of
the process we're attaching to. That would lead to a page fault
when this function returns. However, since the processor can't
call the page fault handler 'cause it can't push EIP on the stack,
this will show up as a stack fault which will crash the entire system.
To prevent this, make sure the page directory of the process we're
attaching to is up-to-date. */
MmUpdatePageDir(Process, (PVOID)CurrentThread->Tcb.StackLimit, MM_STACK_SIZE);
MmUpdatePageDir(Process, (PVOID)CurrentThread, sizeof(ETHREAD));
KeRaiseIrql(DISPATCH_LEVEL, &oldlvl);