Bug 694724: Have filenameforall and getenv honor SAFER

jmuehlenhoff · Mar 29, 2016 · ab109aa · ab109aa
1 parent bcdbe51
commit ab109aa
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Showing 2 changed files with 20 additions and 16 deletions.
diff --git a/Resource/Init/gs_init.ps b/Resource/Init/gs_init.ps
diff --git a/psi/zfile.c b/psi/zfile.c
@@ -371,22 +371,26 @@ file_continue(i_ctx_t *i_ctx_p)
 
     if (len < devlen)
         return_error(gs_error_rangecheck);     /* not even room for device len */
-    memcpy((char *)pscratch->value.bytes, iodev->dname, devlen);
-    code = iodev->procs.enumerate_next(pfen, (char *)pscratch->value.bytes + devlen,
-                len - devlen);
-    if (code == ~(uint) 0) {    /* all done */
-        esp -= 5;               /* pop proc, pfen, devlen, iodev , mark */
-        return o_pop_estack;
-    } else if (code > len)      /* overran string */
-        return_error(gs_error_rangecheck);
-    else {
-        push(1);
-        ref_assign(op, pscratch);
-        r_set_size(op, code + devlen);
-        push_op_estack(file_continue);  /* come again */
-        *++esp = pscratch[2];   /* proc */
-        return o_push_estack;
-    }
+
+    do {
+        memcpy((char *)pscratch->value.bytes, iodev->dname, devlen);
+        code = iodev->procs.enumerate_next(pfen, (char *)pscratch->value.bytes + devlen,
+                    len - devlen);
+        if (code == ~(uint) 0) {    /* all done */
+            esp -= 5;               /* pop proc, pfen, devlen, iodev , mark */
+            return o_pop_estack;
+        } else if (code > len)      /* overran string */
+            return_error(gs_error_rangecheck);
+        else if (iodev != iodev_default(imemory)
+              || (check_file_permissions_reduced(i_ctx_p, (char *)pscratch->value.bytes, code + devlen, "PermitFileReading")) == 0) {
+            push(1);
+            ref_assign(op, pscratch);
+            r_set_size(op, code + devlen);
+            push_op_estack(file_continue);  /* come again */
+            *++esp = pscratch[2];   /* proc */
+            return o_push_estack;
+        }
+    } while(1);
 }
 /* Cleanup procedure for enumerating files */
 static int