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kern: SvcSetMemoryPermission

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Michael Scire 2020-07-23 00:58:44 -07:00 • committed by SciresM
parent d87a9f011c
commit c622539b95
2 changed files with 60 additions and 3 deletions
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30
libraries/libmesosphere/source/kern_k_page_table_base.cpp
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@ -1021,7 +1021,35 @@ namespace ams::kern {
}
Result KPageTableBase::SetMemoryPermission(KProcessAddress addr, size_t size, ams::svc::MemoryPermission svc_perm) {
MESOSPHERE_UNIMPLEMENTED();
const size_t num_pages = size / PageSize;
/* Lock the table. */
KScopedLightLock lk(this->general_lock);
/* Verify we can change the memory permission. */
KMemoryState old_state;
KMemoryPermission old_perm;
R_TRY(this->CheckMemoryState(std::addressof(old_state), std::addressof(old_perm), nullptr, addr, size, KMemoryState_FlagCanReprotect, KMemoryState_FlagCanReprotect, KMemoryPermission_None, KMemoryPermission_None, KMemoryAttribute_All, KMemoryAttribute_None));
/* Determine new perm. */
const KMemoryPermission new_perm = ConvertToKMemoryPermission(svc_perm);
R_SUCCEED_IF(old_perm == new_perm);
/* Create an update allocator. */
KMemoryBlockManagerUpdateAllocator allocator(this->memory_block_slab_manager);
R_TRY(allocator.GetResult());
/* We're going to perform an update, so create a helper. */
KScopedPageTableUpdater updater(this);
/* Perform mapping operation. */
const KPageProperties properties = { new_perm, false, false, false };
R_TRY(this->Operate(updater.GetPageList(), addr, num_pages, Null<KPhysicalAddress>, false, properties, OperationType_ChangePermissions, false));
/* Update the blocks. */
this->memory_block_manager.Update(&allocator, addr, num_pages, old_state, new_perm, KMemoryAttribute_None);
return ResultSuccess();
}
Result KPageTableBase::SetProcessMemoryPermission(KProcessAddress addr, size_t size, ams::svc::MemoryPermission svc_perm) {