Check page table bounds

Signed-off-by: Marcus Weiner <[email protected]>
r9os · Sep 10, 2023 · f072d8f · f072d8f
1 parent 9c52cb5
commit f072d8f
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/riscv64/src/mem.rs b/riscv64/src/mem.rs
@@ -86,6 +86,7 @@ impl PageTable {
     }
 
     pub fn dump_entry(&self, at: u16) -> PageTableEntry {
+        assert!(at < 512, "index out of range: page tables always have 512 entries");
         let addr = self.addr + (at as u64 * Self::ENTRY_SIZE);
         let val = unsafe { read_volatile(addr as *const u64) };
         val.into()