https://git.reactos.org/?p=reactos.git;a=commitdiff;h=3aaee3562910cd06113569cace4eb155ee2a6050
commit 3aaee3562910cd06113569cace4eb155ee2a6050 Author: Timo Kreuzer <[email protected]> AuthorDate: Mon Feb 5 01:23:30 2018 +0100 Commit: Timo Kreuzer <[email protected]> CommitDate: Sun Sep 20 23:08:17 2020 +0200 [NTOS:KE] Save and restore previous mode in KiZwSystemService and fix restoring the trap frame --- ntoskrnl/ke/amd64/trap.S | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/ntoskrnl/ke/amd64/trap.S b/ntoskrnl/ke/amd64/trap.S index 15f816f756b..3bcaa1684bf 100644 --- a/ntoskrnl/ke/amd64/trap.S +++ b/ntoskrnl/ke/amd64/trap.S @@ -835,6 +835,10 @@ FUNC KiZwSystemService /* Get current thread */ mov r11, gs:[PcCurrentThread] + /* Save PreviousMode in the trap frame */ + mov dil, byte ptr [r11 + KTHREAD_PreviousMode] + mov byte ptr [rbp + KTRAP_FRAME_PreviousMode], dil + /* Save the old trap frame in TrapFrame.Rdx */ mov rdi, [r11 + KTHREAD_TrapFrame] mov [rbp + KTRAP_FRAME_Rdx], rdi @@ -865,9 +869,13 @@ FUNC KiZwSystemService /* Restore the old trap frame */ mov r11, gs:[PcCurrentThread] - mov rsi, [rsp + KTRAP_FRAME_Rdx] + mov rsi, [rbp + KTRAP_FRAME_Rdx] mov [r11 + KTHREAD_TrapFrame], rsi + /* Restore PreviousMode from the trap frame */ + mov dil, byte ptr [rbp + KTRAP_FRAME_PreviousMode] + mov byte ptr [r11 + KTHREAD_PreviousMode], dil + /* Restore rdi and rsi */ mov rsi, [rbp + KTRAP_FRAME_Rsi] mov rdi, [rbp + KTRAP_FRAME_Rdi]
