[reactos] 08/09: [NTOS] Treat page faults with interrupts disabled as access violation

[Timo Kreuzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=b3a8f8611de4c8c6e3c71…

commit b3a8f8611de4c8c6e3c71d3c54f0b5bc8ebe2a27
Author:     Timo Kreuzer <timo.kreuzer(a)reactos.org>
AuthorDate: Sat Jul 23 12:42:20 2022 +0200
Commit:     Timo Kreuzer <timo.kreuzer(a)reactos.org>
CommitDate: Thu Aug 4 16:15:24 2022 +0200

    [NTOS] Treat page faults with interrupts disabled as access violation
---
 ntoskrnl/ke/amd64/trap.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ntoskrnl/ke/amd64/trap.S b/ntoskrnl/ke/amd64/trap.S
index 0b4f0375af2..73470363a23 100644
--- a/ntoskrnl/ke/amd64/trap.S
+++ b/ntoskrnl/ke/amd64/trap.S
@@ -428,6 +428,10 @@ FUNC KiPageFault
     /* Save page fault address */
     mov rdx, cr2
     mov [rbp  + KTRAP_FRAME_FaultAddress], rdx
+    
+    /* If interrupts are off, treat this as an access violation */
+    test dword ptr [rbp + KTRAP_FRAME_EFlags], EFLAGS_IF_MASK
+    jz AccessViolation
 
     /* Enable interrupts for the page fault handler */
     sti