tests: set MALLOC_PERTURB_ to expose memory bugs

glibc wipes malloc(3) memory when the MALLOC_PERTURB_ environment
variable is set.  The value of the environment variable determines the
bit pattern used to wipe memory.  For more information, see
http://udrepper.livejournal.com/11429.html.

Set MALLOC_PERTURB_ for gtester and qemu-iotests.  Note we pick a random
value from 1 to 255 to expose more bugs.  If you need to reproduce a
crash use 'show environment' in gdb to extract the MALLOC_PERTURB_
value from a core dump.

Both make check and qemu-iotests pass with MALLOC_PERTURB_ enabled.
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Message-id: 1369661331-28041-1-git-send-email-stefanha@redhat.com
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

tests/Makefile

@@ -171,6 +171,7 @@ GCOV_OPTIONS = -n $(if $(V),-f,)
 $(patsubst %, check-qtest-%, $(QTEST_TARGETS)): check-qtest-%: $(check-qtest-y)
 	$(if $(CONFIG_GCOV),@rm -f *.gcda */*.gcda */*/*.gcda */*/*/*.gcda,)
 	$(call quiet-command,QTEST_QEMU_BINARY=$*-softmmu/qemu-system-$* \
+		MALLOC_PERTURB_=$${MALLOC_PERTURB_:-$$((RANDOM % 255 + 1))} \
 		gtester $(GTESTER_OPTIONS) -m=$(SPEED) $(check-qtest-$*-y),"GTESTER $@")
 	$(if $(CONFIG_GCOV),@for f in $(gcov-files-$*-y); do \
 	  echo Gcov report for $$f:;\
@@ -180,7 +181,9 @@ $(patsubst %, check-qtest-%, $(QTEST_TARGETS)): check-qtest-%: $(check-qtest-y)
 .PHONY: $(patsubst %, check-%, $(check-unit-y))
 $(patsubst %, check-%, $(check-unit-y)): check-%: %
 	$(if $(CONFIG_GCOV),@rm -f *.gcda */*.gcda */*/*.gcda */*/*/*.gcda,)
-	$(call quiet-command,gtester $(GTESTER_OPTIONS) -m=$(SPEED) $*,"GTESTER $*")
+	$(call quiet-command, \
+		MALLOC_PERTURB_=$${MALLOC_PERTURB_:-$$((RANDOM % 255 + 1))} \
+		gtester $(GTESTER_OPTIONS) -m=$(SPEED) $*,"GTESTER $*")
 	$(if $(CONFIG_GCOV),@for f in $(gcov-files-$(subst tests/,,$*)-y); do \
 	  echo Gcov report for $$f:;\
 	  $(GCOV) $(GCOV_OPTIONS) $$f -o `dirname $$f`; \

tests/qemu-iotests/check

@@ -214,7 +214,8 @@ do
 	start=`_wallclock`
 	$timestamp && echo -n "	["`date "+%T"`"]"
 	[ ! -x $seq ] && chmod u+x $seq # ensure we can run it
-	./$seq >$tmp.out 2>&1
+	MALLOC_PERTURB_=${MALLOC_PERTURB_:-$(($RANDOM % 255 + 1))} \
+		./$seq >$tmp.out 2>&1
 	sts=$?
 	$timestamp && _timestamp
 	stop=`_wallclock`