1 files changed, 12 insertions, 0 deletions
diff --git a/deps/v8/src/compiler/backend/frame-elider.cc b/deps/v8/src/compiler/backend/frame-elider.cc
index 293fc9352c..5454996b38 100644
--- a/deps/v8/src/compiler/backend/frame-elider.cc
+++ b/deps/v8/src/compiler/backend/frame-elider.cc
@@ -29,6 +29,18 @@ void FrameElider::MarkBlocks() {
         block->mark_needs_frame();
         break;
       }
+      if (instr->arch_opcode() == ArchOpcode::kArchStackSlot &&
+          instr->InputAt(0)->IsImmediate() &&
+          code_->GetImmediate(ImmediateOperand::cast(instr->InputAt(0)))
+                  .ToInt32() > 0) {
+        // We shouldn't allow accesses to the stack below the current stack
+        // pointer (indicated by positive slot indices).
+        // This is in particular because signal handlers (which could, of
+        // course, be triggered at any point in time) will overwrite this
+        // memory.
+        block->mark_needs_frame();
+        break;
+      }
     }
   }
 }