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kern/ldr: add support for --x executables

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This commit is contained in:
Michael Scire
2024-10-09 17:42:02 -07:00
committed by SciresM
parent 2855b8ee35
commit ff38a32a9b
9 changed files with 54 additions and 40 deletions
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21
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_k_page_table.hpp
View File

@@ -109,6 +109,9 @@ namespace ams::kern::arch::arm64 {
KPageTableManager &GetPageTableManager() const { return *m_manager; }
private:
constexpr PageTableEntry GetEntryTemplate(const KPageProperties properties) const {
/* Check that the property is not kernel execute. */
MESOSPHERE_ABORT_UNLESS((properties.perm & KMemoryPermission_KernelExecute) == 0);
/* Set basic attributes. */
PageTableEntry entry{PageTableEntry::ExtensionFlag_Valid};
entry.SetPrivilegedExecuteNever(true);
@@ -122,22 +125,24 @@ namespace ams::kern::arch::arm64 {
/* Set page attribute. */
if (properties.io) {
MESOSPHERE_ABORT_UNLESS(!properties.uncached);
MESOSPHERE_ABORT_UNLESS((properties.perm & (KMemoryPermission_KernelExecute | KMemoryPermission_UserExecute)) == 0);
MESOSPHERE_ABORT_UNLESS((properties.perm & KMemoryPermission_UserExecute) == 0);
entry.SetPageAttribute(PageTableEntry::PageAttribute_Device_nGnRnE)
.SetUserExecuteNever(true);
} else if (properties.uncached) {
MESOSPHERE_ABORT_UNLESS((properties.perm & (KMemoryPermission_KernelExecute | KMemoryPermission_UserExecute)) == 0);
MESOSPHERE_ABORT_UNLESS((properties.perm & KMemoryPermission_UserExecute) == 0);
entry.SetPageAttribute(PageTableEntry::PageAttribute_NormalMemoryNotCacheable);
entry.SetPageAttribute(PageTableEntry::PageAttribute_NormalMemoryNotCacheable)
.SetUserExecuteNever(true);
} else {
entry.SetPageAttribute(PageTableEntry::PageAttribute_NormalMemory);
}
/* Set user execute never bit. */
if (properties.perm != KMemoryPermission_UserReadExecute) {
MESOSPHERE_ABORT_UNLESS((properties.perm & (KMemoryPermission_KernelExecute | KMemoryPermission_UserExecute)) == 0);
entry.SetUserExecuteNever(true);
if ((properties.perm & KMemoryPermission_UserExecute) != 0) {
/* Check that the permission is either r--/--x or r--/r-x. */
MESOSPHERE_ABORT_UNLESS((properties.perm & ~ams::svc::MemoryPermission_Read) == (KMemoryPermission_KernelRead | KMemoryPermission_UserExecute));
} else {
entry.SetUserExecuteNever(true);
}
}
/* Set AP[1] based on perm. */

11
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_userspace_memory_access.hpp
View File

@@ -21,7 +21,18 @@ namespace ams::kern::arch::arm64 {
void UserspaceAccessFunctionAreaBegin();
class UserspaceAccess {
private:
static bool CopyMemoryFromUserSize32BitWithSupervisorAccessImpl(void *dst, const void *src);
public:
static bool CopyMemoryFromUserSize32BitWithSupervisorAccess(void *dst, const void *src) {
/* Check that the address is within the valid userspace range. */
if (const uintptr_t src_uptr = reinterpret_cast<uintptr_t>(src); src_uptr < ams::svc::AddressNullGuard32Size || (src_uptr + sizeof(u32) - 1) >= ams::svc::AddressMemoryRegion39Size) {
return false;
}
return CopyMemoryFromUserSize32BitWithSupervisorAccessImpl(dst, src);
}
static bool CopyMemoryFromUser(void *dst, const void *src, size_t size);
static bool CopyMemoryFromUserAligned32Bit(void *dst, const void *src, size_t size);
static bool CopyMemoryFromUserAligned64Bit(void *dst, const void *src, size_t size);