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* [daxctl PATCH] daxctl/list: Avoid memory operations without resource data
@ 2019-11-27 20:33 Dan Williams
  0 siblings, 0 replies; only message in thread
From: Dan Williams @ 2019-11-27 20:33 UTC (permalink / raw)
  To: linux-nvdimm; +Cc: Michal Biesek

Resource data is restricted to root-only, and "daxctl list" is likely to
be run by non-root. Skip listing memory-object details when the resource
is not available.

Otherwise, "daxctl list" from non-root emits:

   libdaxctl: memblock_in_dev: dax1.0: Unable to determine resource

Reported-by: Michal Biesek <>
Signed-off-by: Dan Williams <>
 util/json.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/util/json.c b/util/json.c
index 0abaf3a5b9c2..6745bcc19058 100644
--- a/util/json.c
+++ b/util/json.c
@@ -306,7 +306,7 @@ struct json_object *util_daxctl_dev_to_json(struct daxctl_dev *dev,
 	if (jobj)
 		json_object_object_add(jdev, "mode", jobj);
-	if (mem) {
+	if (mem && daxctl_dev_get_resource(dev) != 0) {
 		movable = daxctl_memory_is_movable(mem);
 		if (movable == 1)
 			jobj = json_object_new_boolean(true);
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2019-11-27 20:33 [daxctl PATCH] daxctl/list: Avoid memory operations without resource data Dan Williams

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