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os: ShadowStack is a forbidden region

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This commit is contained in:
hexkyz
2026-09-21 21:20:13 +01:00
parent 0411dbfdda
commit 1de771e264
2 changed files with 18 additions and 2 deletions
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2
libraries/libstratosphere/source/os/impl/os_address_space_allocator.hpp
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@@ -33,7 +33,7 @@ namespace ams::os::impl {
using AddressType = AddressType_;
using SizeType = SizeType_;
private:
static constexpr size_t MaxForbiddenRegions = 2;
static constexpr size_t MaxForbiddenRegions = 3;
private:
InternalCriticalSection m_critical_section;
AddressType m_start_page;

18
libraries/libstratosphere/source/os/impl/os_aslr_space_manager_impl.os.horizon.hpp
View File

@@ -30,7 +30,7 @@ namespace ams::os::impl {
static constexpr u64 AslrBase64Bit = 0x0008000000ul;
static constexpr u64 AslrSize64Bit = 0x7FF8000000ul;
static constexpr size_t ForbiddenRegionCount = 2;
static constexpr size_t ForbiddenRegionCount = 3;
private:
static u64 GetAslrInfo(os::NativeHandle process_handle, svc::InfoType type) {
u64 value;
@@ -75,6 +75,14 @@ namespace ams::os::impl {
static u64 GetAliasSpaceSize(os::NativeHandle process_handle = svc::PseudoHandle::CurrentProcess) {
return GetAslrInfo(process_handle, svc::InfoType_AliasRegionSize);
}
static u64 GetShadowStackSpaceBeginAddress(os::NativeHandle process_handle = svc::PseudoHandle::CurrentProcess) {
return GetAslrInfo(process_handle, svc::InfoType_ShadowStackRegionAddress);
}
static u64 GetShadowStackSpaceSize(os::NativeHandle process_handle = svc::PseudoHandle::CurrentProcess) {
return GetAslrInfo(process_handle, svc::InfoType_ShadowStackRegionSize);
}
static u64 GetAslrSpaceBeginAddress(os::NativeHandle process_handle = svc::PseudoHandle::CurrentProcess) {
return GetAslrInfo(process_handle, svc::InfoType_AslrRegionAddress);
@@ -87,6 +95,14 @@ namespace ams::os::impl {
void InitializeForbiddenRegions(os::NativeHandle process_handle) {
m_forbidden_regions[0] = { .address = GetHeapSpaceBeginAddress(process_handle), .size = GetHeapSpaceSize(process_handle) };
m_forbidden_regions[1] = { .address = GetAliasSpaceBeginAddress(process_handle), .size = GetAliasSpaceSize(process_handle) };
/* 23.0.0+ added ShadowStack to the forbidden region list. */
/* Unconditionally create the region, but set it's size to 0 on < 23.0.0. */
/* This should be fine because the address space allocator discards 0 sized regions without changing the final forbidden region count. */
if (hos::GetVersion() >= hos::Version_23_0_0) {
m_forbidden_regions[2] = { .address = GetShadowStackSpaceBeginAddress(process_handle), .size = GetShadowStackSpaceSize(process_handle) };
} else {
m_forbidden_regions[2] = { .address = 0, .size = 0 };
}
}
};