From 42a7c5d017a3a6bb5e6ed1b51b955ea3d756eead Mon Sep 17 00:00:00 2001
From: Markus Wick <markus@selfnet.de>
Date: Sat, 29 May 2021 09:24:09 +0200
Subject: core/memory: Check our memory fallbacks for out-of-bound behavior.
This makes it by far harder to crash yuzu.
Also implement the 48bit masking of AARCH64 while touching this code.
---
src/core/memory.cpp | 43 +++++++++++++++++++++++++++++++++++++++----
1 file changed, 39 insertions(+), 4 deletions(-)
(limited to 'src/core/memory.cpp')
diff --git a/src/core/memory.cpp b/src/core/memory.cpp
index bf2ef78166..9857278f66 100644
--- a/src/core/memory.cpp
+++ b/src/core/memory.cpp
@@ -591,7 +591,15 @@ struct Memory::Impl {
* @returns The instance of T read from the specified virtual address.
*/
template <typename T>
- T Read(const VAddr vaddr) {
+ T Read(VAddr vaddr) {
+ // AARCH64 masks the upper 16 bit of all memory accesses
+ vaddr &= 0xffffffffffffLL;
+
+ if (vaddr >= 1uLL << current_page_table->GetAddressSpaceBits()) {
+ LOG_ERROR(HW_Memory, "Unmapped Read{} @ 0x{:08X}", sizeof(T) * 8, vaddr);
+ return 0;
+ }
+
// Avoid adding any extra logic to this fast-path block
const uintptr_t raw_pointer = current_page_table->pointers[vaddr >> PAGE_BITS].Raw();
if (const u8* const pointer = Common::PageTable::PageInfo::ExtractPointer(raw_pointer)) {
@@ -629,7 +637,16 @@ struct Memory::Impl {
* is undefined.
*/
template <typename T>
- void Write(const VAddr vaddr, const T data) {
+ void Write(VAddr vaddr, const T data) {
+ // AARCH64 masks the upper 16 bit of all memory accesses
+ vaddr &= 0xffffffffffffLL;
+
+ if (vaddr >= 1uLL << current_page_table->GetAddressSpaceBits()) {
+ LOG_ERROR(HW_Memory, "Unmapped Write{} 0x{:08X} @ 0x{:016X}", sizeof(data) * 8,
+ static_cast<u32>(data), vaddr);
+ return;
+ }
+
// Avoid adding any extra logic to this fast-path block
const uintptr_t raw_pointer = current_page_table->pointers[vaddr >> PAGE_BITS].Raw();
if (u8* const pointer = Common::PageTable::PageInfo::ExtractPointer(raw_pointer)) {
@@ -656,7 +673,16 @@ struct Memory::Impl {
}
template <typename T>
- bool WriteExclusive(const VAddr vaddr, const T data, const T expected) {
+ bool WriteExclusive(VAddr vaddr, const T data, const T expected) {
+ // AARCH64 masks the upper 16 bit of all memory accesses
+ vaddr &= 0xffffffffffffLL;
+
+ if (vaddr >= 1uLL << current_page_table->GetAddressSpaceBits()) {
+ LOG_ERROR(HW_Memory, "Unmapped Write{} 0x{:08X} @ 0x{:016X}", sizeof(data) * 8,
+ static_cast<u32>(data), vaddr);
+ return true;
+ }
+
const uintptr_t raw_pointer = current_page_table->pointers[vaddr >> PAGE_BITS].Raw();
if (u8* const pointer = Common::PageTable::PageInfo::ExtractPointer(raw_pointer)) {
// NOTE: Avoid adding any extra logic to this fast-path block
@@ -683,7 +709,16 @@ struct Memory::Impl {
return true;
}
- bool WriteExclusive128(const VAddr vaddr, const u128 data, const u128 expected) {
+ bool WriteExclusive128(VAddr vaddr, const u128 data, const u128 expected) {
+ // AARCH64 masks the upper 16 bit of all memory accesses
+ vaddr &= 0xffffffffffffLL;
+
+ if (vaddr >= 1uLL << current_page_table->GetAddressSpaceBits()) {
+ LOG_ERROR(HW_Memory, "Unmapped Write{} 0x{:08X} @ 0x{:016X}", sizeof(data) * 8,
+ static_cast<u32>(data[0]), vaddr);
+ return true;
+ }
+
const uintptr_t raw_pointer = current_page_table->pointers[vaddr >> PAGE_BITS].Raw();
if (u8* const pointer = Common::PageTable::PageInfo::ExtractPointer(raw_pointer)) {
// NOTE: Avoid adding any extra logic to this fast-path block
--
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