From c39c8e69824af03799b0903f218eac81eba80751 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Wed, 3 Apr 2019 20:23:14 -0400
Subject: [PATCH] kernel/svc: Properly sanitize mutex address in
WaitProcessWideKeyAtomic
We need to be checking whether or not the given address is within the
kernel address space or if the given address isn't word-aligned and bail
in these scenarios instead of trashing any kernel state.
---
src/core/hle/kernel/svc.cpp | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp
index ab10db3df..2fd07ab34 100644
--- a/src/core/hle/kernel/svc.cpp
+++ b/src/core/hle/kernel/svc.cpp
@@ -1339,6 +1339,20 @@ static ResultCode WaitProcessWideKeyAtomic(VAddr mutex_addr, VAddr condition_var
"called mutex_addr={:X}, condition_variable_addr={:X}, thread_handle=0x{:08X}, timeout={}",
mutex_addr, condition_variable_addr, thread_handle, nano_seconds);
+ if (Memory::IsKernelVirtualAddress(mutex_addr)) {
+ LOG_ERROR(
+ Kernel_SVC,
+ "Given mutex address must not be within the kernel address space. address=0x{:016X}",
+ mutex_addr);
+ return ERR_INVALID_ADDRESS_STATE;
+ }
+
+ if (!Common::IsWordAligned(mutex_addr)) {
+ LOG_ERROR(Kernel_SVC, "Given mutex address must be word-aligned. address=0x{:016X}",
+ mutex_addr);
+ return ERR_INVALID_ADDRESS;
+ }
+
auto* const current_process = Core::System::GetInstance().Kernel().CurrentProcess();
const auto& handle_table = current_process->GetHandleTable();
SharedPtr<Thread> thread = handle_table.Get<Thread>(thread_handle);