[PATCH] ntoskrnl.exe: Add emulation of rdmsr for MSR_LSTAR control register.
Derek Lesho
dereklesho52 at gmail.com
Wed Mar 20 23:19:35 CDT 2019
Signed-off-by: Derek Lesho <dereklesho52 at Gmail.com>
---
dlls/ntoskrnl.exe/instr.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/dlls/ntoskrnl.exe/instr.c b/dlls/ntoskrnl.exe/instr.c
index 67cdd327ee..192ba05ee4 100644
--- a/dlls/ntoskrnl.exe/instr.c
+++ b/dlls/ntoskrnl.exe/instr.c
@@ -586,6 +586,12 @@ static BYTE *INSTR_GetOperandAddr( CONTEXT *context, BYTE *instr,
}
+static void fake_syscall_function(void)
+{
+ TRACE("() stub\n");
+}
+
+
/***********************************************************************
* emulate_instruction
*
@@ -757,6 +763,25 @@ static DWORD emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT *context )
context->Rip += prefixlen + 3;
return ExceptionContinueExecution;
}
+ case 0x32: /* rdmsr */
+ {
+ int reg = context->Rcx & 0xffffffff;
+ TRACE("rdmsr CR 0x%08x\n", reg);
+ switch (reg)
+ {
+ case 0xc0000082:
+ {
+ ULONGLONG syscall_address = (ULONGLONG) fake_syscall_function;
+
+ context->Rdx = (syscall_address >> 32) & 0xffffffff;
+ context->Rax = syscall_address & 0xffffffff;
+ }
+ break;
+ default: return ExceptionContinueSearch;
+ }
+ context->Rip += prefixlen + 2;
+ return ExceptionContinueExecution;
+ }
case 0xb6: /* movzx Eb, Gv */
case 0xb7: /* movzx Ew, Gv */
{
--
2.20.1
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