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kern: implement IsValidPageGroup

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This commit is contained in:
Michael Scire 2020-02-18 01:44:40 -08:00
parent 154422562a
commit 772e1f1c4f
4 changed files with 89 additions and 6 deletions
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1
libraries/libmesosphere/include/mesosphere/kern_k_page_group.hpp
View file

@ -90,6 +90,7 @@ namespace ams::kern {
iterator begin() const { return this->block_list.begin(); }
iterator end() const { return this->block_list.end(); }
bool empty() const { return this->block_list.empty(); }
Result AddBlock(KVirtualAddress addr, size_t num_pages);
void Open() const;

5
libraries/libmesosphere/include/mesosphere/kern_k_page_table_base.hpp
View file

@ -35,6 +35,9 @@ namespace ams::kern {
class KPageTableBase {
NON_COPYABLE(KPageTableBase);
NON_MOVEABLE(KPageTableBase);
public:
using TraversalEntry = KPageTableImpl::TraversalEntry;
using TraversalContext = KPageTableImpl::TraversalContext;
protected:
enum MemoryFillValue {
MemoryFillValue_Zero = 0,
@ -214,7 +217,7 @@ namespace ams::kern {
Result AllocateAndMapPagesImpl(PageLinkedList *page_list, KProcessAddress address, size_t num_pages, const KPageProperties properties);
Result MapPageGroupImpl(PageLinkedList *page_list, KProcessAddress address, const KPageGroup &pg, const KPageProperties properties, bool reuse_ll);
bool IsValidPageGroup(const KPageGroup &pg, KProcessAddress addr, size_t num_pages) const;
bool IsValidPageGroup(const KPageGroup &pg, KProcessAddress addr, size_t num_pages);
NOINLINE Result MapPages(KProcessAddress *out_addr, size_t num_pages, size_t alignment, KPhysicalAddress phys_addr, bool is_pa_valid, KProcessAddress region_start, size_t region_num_pages, KMemoryState state, KMemoryPermission perm);
public:

1
libraries/libmesosphere/source/arch/arm64/kern_k_page_table.cpp
View file

@ -224,7 +224,6 @@ namespace ams::kern::arch::arm64 {
next_valid = impl.BeginTraversal(std::addressof(next_entry), std::addressof(context), virt_addr);
MESOSPHERE_ASSERT(next_valid);
}
//MESOSPHERE_LOG("Unmap: Acting on %08zx %08zx (%p %p %p)\n", GetInteger(next_entry.phys_addr), next_entry.block_size, context.l1_entry, context.l2_entry, context.l3_entry);
/* Check that our state is coherent. */
MESOSPHERE_ASSERT((next_entry.block_size / PageSize) <= remaining_pages);

86
libraries/libmesosphere/source/kern_k_page_table_base.cpp
View file

@ -337,9 +337,89 @@ namespace ams::kern {
return ResultSuccess();
}
bool KPageTableBase::IsValidPageGroup(const KPageGroup &pg, KProcessAddress addr, size_t num_pages) const {
/* TODO */
bool KPageTableBase::IsValidPageGroup(const KPageGroup &pg, KProcessAddress addr, size_t num_pages) {
/* Empty groups are necessarily invalid. */
if (pg.empty()) {
return false;
}
auto &impl = this->GetImpl();
/* We're going to validate that the group we'd expect is the group we see. */
auto cur_it = pg.begin();
KVirtualAddress cur_block_address = cur_it->GetAddress();
size_t cur_block_pages = cur_it->GetNumPages();
auto UpdateCurrentIterator = [&]() ALWAYS_INLINE_LAMBDA {
if (cur_block_pages == 0) {
if ((++cur_it) == pg.end()) {
return false;
}
cur_block_address = cur_it->GetAddress();
cur_block_pages = cur_it->GetNumPages();
}
return true;
};
/* Begin traversal. */
TraversalContext context;
TraversalEntry next_entry;
if (!impl.BeginTraversal(std::addressof(next_entry), std::addressof(context), addr)) {
return false;
}
/* Prepare tracking variables. */
KPhysicalAddress cur_addr = next_entry.phys_addr;
size_t cur_size = next_entry.block_size - (GetInteger(cur_addr) & (next_entry.block_size - 1));
size_t tot_size = cur_size;
/* Iterate, comparing expected to actual. */
while (tot_size < num_pages * PageSize) {
if (!impl.ContinueTraversal(std::addressof(next_entry), std::addressof(context))) {
return false;
}
if (next_entry.phys_addr != (cur_addr + cur_size)) {
const size_t cur_pages = cur_size / PageSize;
if (!IsHeapPhysicalAddress(cur_addr)) {
return false;
}
if (!UpdateCurrentIterator()) {
return false;
}
if (cur_block_address != GetHeapVirtualAddress(cur_addr) || cur_block_pages < cur_pages) {
return false;
}
cur_block_address += cur_size;
cur_block_pages -= cur_pages;
cur_addr = next_entry.phys_addr;
cur_size = next_entry.block_size;
} else {
cur_size += next_entry.block_size;
}
tot_size += next_entry.block_size;
}
/* Ensure we compare the right amount for the last block. */
if (tot_size > num_pages * PageSize) {
cur_size -= (tot_size - num_pages * PageSize);
}
if (!IsHeapPhysicalAddress(cur_addr)) {
return false;
}
if (!UpdateCurrentIterator()) {
return false;
}
return cur_block_address == GetHeapVirtualAddress(cur_addr) && cur_block_pages == (cur_size / PageSize);
}
Result KPageTableBase::MapPages(KProcessAddress *out_addr, size_t num_pages, size_t alignment, KPhysicalAddress phys_addr, bool is_pa_valid, KProcessAddress region_start, size_t region_num_pages, KMemoryState state, KMemoryPermission perm) {
@ -437,7 +517,7 @@ namespace ams::kern {
R_TRY(this->CheckMemoryState(address, size, KMemoryState_All, state, KMemoryPermission_None, KMemoryPermission_None, KMemoryAttribute_All, KMemoryAttribute_None));
/* Check that the page group is valid. */
R_UNLESS(this->IsValidPageGroup(pg, address, size), svc::ResultInvalidCurrentMemory());
R_UNLESS(this->IsValidPageGroup(pg, address, num_pages), svc::ResultInvalidCurrentMemory());
/* Create an update allocator. */
KMemoryBlockManagerUpdateAllocator allocator(this->memory_block_slab_manager);