kern: add new overflow checks on KMemoryRegions

2020-12-01 17:14:23 -08:00
parent 866310937a
commit a56bdab820
8 changed files with 32 additions and 1 deletions
--- a/libraries/libmesosphere/source/kern_k_page_table_base.cpp
+++ b/libraries/libmesosphere/source/kern_k_page_table_base.cpp
@@ -1807,6 +1807,9 @@ namespace ams::kern {
        const KMemoryRegion *region = KMemoryLayout::GetPhysicalMemoryRegionTree().FindFirstDerived(region_type);
        R_UNLESS(region != nullptr, svc::ResultOutOfRange());

+        /* Check that the region is valid. */
+        MESOSPHERE_ABORT_UNLESS(region->GetEndAddress() != 0);
+
        /* Map the region. */
        R_TRY_CATCH(this->MapStatic(region->GetAddress(), region->GetSize(), perm)) {
            R_CONVERT(svc::ResultInvalidAddress, svc::ResultOutOfRange())