in-file function type derivation violates safety

Bug #657499 reported by Nikodemus Siivola on 2010-10-09
This bug affects 1 person
Affects Status Importance Assigned to Milestone

Bug Description

File-compiling the following and calling QUUX returns "foo" instead of signalling a type-error.

(declaim (optimize safety))

(defun foo ()
  (cons t t))

(defun bar ()
  (let ((cons (foo)))
    (setf (car cons) 3)

(defun quux ()
  (eval `(locally (declare (optimize safety))
           (setf (fdefinition 'foo) (lambda () (copy-seq "foobar")))

Changed in sbcl:
assignee: nobody → Nikodemus Siivola (nikodemus)
status: New → In Progress
tags: added: compiler types
Nikodemus Siivola (nikodemus) wrote :

Marking this as "high" due to heap corruption potential.

Changed in sbcl:
importance: Undecided → High
Nikodemus Siivola (nikodemus) wrote :

Attached patch is my current status on this. Pending addition of tests and more testing, I plan to commit this soonish.

The basic approach is to use ASSERT-LVAR-TYPE instead of DERIVE-NODE-TYPE for derived untrusted calls.

Nikodemus Siivola (nikodemus) wrote :


Changed in sbcl:
assignee: Nikodemus Siivola (nikodemus) → nobody
status: In Progress → Fix Committed
Changed in sbcl:
status: Fix Committed → Fix Released
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