how would you like your deadbeef? well done?
since we support variable poison values, we should invert the patterns
sometimes to find bugs where the deadbeef values hide the bugs. (we
can of course do even more with extra tricksy bit patterns, but start
with this.)
Index: subr_poison.c
===
RCS file: /cvs/src/sys/kern/subr_poison.c,v
retrieving revision 1.7
diff -u -p -r1.7 subr_poison.c
--- subr_poison.c 19 May 2014 14:30:03 - 1.7
+++ subr_poison.c 8 Jul 2014 20:09:38 -
@@ -43,7 +43,17 @@ poison_value(void *v)
l = l >> PAGE_SHIFT;
- return (l & 1) ? POISON0 : POISON1;
+ switch (l & 3) {
+ case 0:
+ return POISON0;
+ case 1:
+ return POISON1;
+ case 2:
+ return ~POISON0;
+ case 3:
+ return ~POISON1;
+ }
+ return 0;
}
void
