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Merge pull request #1472 from lioncash/san

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svc: Add missing address range sanitizing checks to MapMemory/UnmapMemory
This commit is contained in:
bunnei 2018-10-11 16:51:41 -04:00 committed by GitHub
commit 3fd26b7147
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2 changed files with 83 additions and 14 deletions
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2
src/core/hle/kernel/errors.h
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@ -22,6 +22,7 @@ enum {
HandleTableFull = 105,
InvalidMemoryState = 106,
InvalidMemoryPermissions = 108,
InvalidMemoryRange = 110,
InvalidThreadPriority = 112,
InvalidProcessorId = 113,
InvalidHandle = 114,
@ -56,6 +57,7 @@ constexpr ResultCode ERR_INVALID_ADDRESS(ErrorModule::Kernel, ErrCodes::InvalidA
constexpr ResultCode ERR_INVALID_ADDRESS_STATE(ErrorModule::Kernel, ErrCodes::InvalidMemoryState);
constexpr ResultCode ERR_INVALID_MEMORY_PERMISSIONS(ErrorModule::Kernel,
ErrCodes::InvalidMemoryPermissions);
constexpr ResultCode ERR_INVALID_MEMORY_RANGE(ErrorModule::Kernel, ErrCodes::InvalidMemoryRange);
constexpr ResultCode ERR_INVALID_HANDLE(ErrorModule::Kernel, ErrCodes::InvalidHandle);
constexpr ResultCode ERR_INVALID_PROCESSOR_ID(ErrorModule::Kernel, ErrCodes::InvalidProcessorId);
constexpr ResultCode ERR_INVALID_SIZE(ErrorModule::Kernel, ErrCodes::InvalidSize);

95
src/core/hle/kernel/svc.cpp
View file

@ -39,6 +39,73 @@ namespace {
constexpr bool Is4KBAligned(VAddr address) {
return (address & 0xFFF) == 0;
}
// Checks if address + size is greater than the given address
// This can return false if the size causes an overflow of a 64-bit type
// or if the given size is zero.
constexpr bool IsValidAddressRange(VAddr address, u64 size) {
return address + size > address;
}
// Checks if a given address range lies within a larger address range.
constexpr bool IsInsideAddressRange(VAddr address, u64 size, VAddr address_range_begin,
VAddr address_range_end) {
const VAddr end_address = address + size - 1;
return address_range_begin <= address && end_address <= address_range_end - 1;
}
bool IsInsideAddressSpace(const VMManager& vm, VAddr address, u64 size) {
return IsInsideAddressRange(address, size, vm.GetAddressSpaceBaseAddress(),
vm.GetAddressSpaceEndAddress());
}
bool IsInsideNewMapRegion(const VMManager& vm, VAddr address, u64 size) {
return IsInsideAddressRange(address, size, vm.GetNewMapRegionBaseAddress(),
vm.GetNewMapRegionEndAddress());
}
// Helper function that performs the common sanity checks for svcMapMemory
// and svcUnmapMemory. This is doable, as both functions perform their sanitizing
// in the same order.
ResultCode MapUnmapMemorySanityChecks(const VMManager& vm_manager, VAddr dst_addr, VAddr src_addr,
u64 size) {
if (!Is4KBAligned(dst_addr) || !Is4KBAligned(src_addr)) {
return ERR_INVALID_ADDRESS;
}
if (size == 0 || !Is4KBAligned(size)) {
return ERR_INVALID_SIZE;
}
if (!IsValidAddressRange(dst_addr, size)) {
return ERR_INVALID_ADDRESS_STATE;
}
if (!IsValidAddressRange(src_addr, size)) {
return ERR_INVALID_ADDRESS_STATE;
}
if (!IsInsideAddressSpace(vm_manager, src_addr, size)) {
return ERR_INVALID_ADDRESS_STATE;
}
if (!IsInsideNewMapRegion(vm_manager, dst_addr, size)) {
return ERR_INVALID_MEMORY_RANGE;
}
const VAddr dst_end_address = dst_addr + size;
if (dst_end_address > vm_manager.GetHeapRegionBaseAddress() &&
dst_addr < vm_manager.GetHeapRegionEndAddress()) {
return ERR_INVALID_MEMORY_RANGE;
}
if (dst_end_address > vm_manager.GetNewMapRegionBaseAddress() &&
dst_addr < vm_manager.GetMapRegionEndAddress()) {
return ERR_INVALID_MEMORY_RANGE;
}
return RESULT_SUCCESS;
}
} // Anonymous namespace
/// Set the process heap to a given Size. It can both extend and shrink the heap.
@ -69,15 +136,15 @@ static ResultCode MapMemory(VAddr dst_addr, VAddr src_addr, u64 size) {
LOG_TRACE(Kernel_SVC, "called, dst_addr=0x{:X}, src_addr=0x{:X}, size=0x{:X}", dst_addr,
src_addr, size);
if (!Is4KBAligned(dst_addr) || !Is4KBAligned(src_addr)) {
return ERR_INVALID_ADDRESS;
auto* const current_process = Core::CurrentProcess();
const auto& vm_manager = current_process->VMManager();
const auto result = MapUnmapMemorySanityChecks(vm_manager, dst_addr, src_addr, size);
if (result != RESULT_SUCCESS) {
return result;
}
if (size == 0 || !Is4KBAligned(size)) {
return ERR_INVALID_SIZE;
}
return Core::CurrentProcess()->MirrorMemory(dst_addr, src_addr, size);
return current_process->MirrorMemory(dst_addr, src_addr, size);
}
/// Unmaps a region that was previously mapped with svcMapMemory
@ -85,15 +152,15 @@ static ResultCode UnmapMemory(VAddr dst_addr, VAddr src_addr, u64 size) {
LOG_TRACE(Kernel_SVC, "called, dst_addr=0x{:X}, src_addr=0x{:X}, size=0x{:X}", dst_addr,
src_addr, size);
if (!Is4KBAligned(dst_addr) || !Is4KBAligned(src_addr)) {
return ERR_INVALID_ADDRESS;
auto* const current_process = Core::CurrentProcess();
const auto& vm_manager = current_process->VMManager();
const auto result = MapUnmapMemorySanityChecks(vm_manager, dst_addr, src_addr, size);
if (result != RESULT_SUCCESS) {
return result;
}
if (size == 0 || !Is4KBAligned(size)) {
return ERR_INVALID_SIZE;
}
return Core::CurrentProcess()->UnmapMemory(dst_addr, src_addr, size);
return current_process->UnmapMemory(dst_addr, src_addr, size);
}
/// Connect to an OS service given the port name, returns the handle to the port to out