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Code Issues Releases Activity

kern: SvcSetMemoryPermission

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This commit is contained in:
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) {

33
libraries/libmesosphere/source/svc/kern_svc_memory.cpp
View file

@ -21,6 +21,35 @@ namespace ams::kern::svc {
namespace {
constexpr bool IsValidSetMemoryPermission(ams::svc::MemoryPermission perm) {
switch (perm) {
case ams::svc::MemoryPermission_None:
case ams::svc::MemoryPermission_Read:
case ams::svc::MemoryPermission_ReadWrite:
return true;
default:
return false;
}
}
Result SetMemoryPermission(uintptr_t address, size_t size, ams::svc::MemoryPermission perm) {
/* Validate address / size. */
R_UNLESS(util::IsAligned(address, PageSize), svc::ResultInvalidAddress());
R_UNLESS(util::IsAligned(size, PageSize), svc::ResultInvalidSize());
R_UNLESS(size > 0, svc::ResultInvalidSize());
R_UNLESS((address < address + size), svc::ResultInvalidCurrentMemory());
/* Validate the permission. */
R_UNLESS(IsValidSetMemoryPermission(perm), svc::ResultInvalidNewMemoryPermission());
/* Validate that the region is in range for the current process. */
auto &page_table = GetCurrentProcess().GetPageTable();
R_UNLESS(page_table.Contains(address, size), svc::ResultInvalidCurrentMemory());
/* Set the memory attribute. */
return page_table.SetMemoryPermission(address, size, perm);
}
Result SetMemoryAttribute(uintptr_t address, size_t size, uint32_t mask, uint32_t attr) {
/* Validate address / size. */
R_UNLESS(util::IsAligned(address, PageSize), svc::ResultInvalidAddress());
@ -97,7 +126,7 @@ namespace ams::kern::svc {
/* ============================= 64 ABI ============================= */
Result SetMemoryPermission64(ams::svc::Address address, ams::svc::Size size, ams::svc::MemoryPermission perm) {
MESOSPHERE_PANIC("Stubbed SvcSetMemoryPermission64 was called.");
return SetMemoryPermission(address, size, perm);
}
Result SetMemoryAttribute64(ams::svc::Address address, ams::svc::Size size, uint32_t mask, uint32_t attr) {
@ -115,7 +144,7 @@ namespace ams::kern::svc {
/* ============================= 64From32 ABI ============================= */
Result SetMemoryPermission64From32(ams::svc::Address address, ams::svc::Size size, ams::svc::MemoryPermission perm) {
MESOSPHERE_PANIC("Stubbed SvcSetMemoryPermission64From32 was called.");
return SetMemoryPermission(address, size, perm);
}
Result SetMemoryAttribute64From32(ams::svc::Address address, ams::svc::Size size, uint32_t mask, uint32_t attr) {