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authorDan Williams <dan.j.williams@intel.com>2016-07-20 02:17:58 +0300
committerDan Williams <dan.j.williams@intel.com>2016-08-24 08:58:52 +0300
commit9d2d01a031a945075d4609b1c4d3c73f10ba61e7 (patch)
tree45743da7f0fdffa1c1f43920d0cf5cf94737af6b /drivers/dax
parent9dc1e4927bfabaf654738c9ecca3a4926a0aaeb5 (diff)
downloadlinux-9d2d01a031a945075d4609b1c4d3c73f10ba61e7.tar.xz
dax: check resource alignment at dax region/device create
All the extents of a dax-device must match the alignment of the region. Otherwise, we are unable to guarantee fault semantics of a given page size. The region must be self-consistent itself as well. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax')
-rw-r--r--drivers/dax/dax.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
index 0a7899d5c65c..03bb54f7f58f 100644
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -206,8 +206,11 @@ struct dax_region *alloc_dax_region(struct device *parent, int region_id,
{
struct dax_region *dax_region;
- dax_region = kzalloc(sizeof(*dax_region), GFP_KERNEL);
+ if (!IS_ALIGNED(res->start, align)
+ || !IS_ALIGNED(resource_size(res), align))
+ return NULL;
+ dax_region = kzalloc(sizeof(*dax_region), GFP_KERNEL);
if (!dax_region)
return NULL;
@@ -560,15 +563,29 @@ int devm_create_dax_dev(struct dax_region *dax_region, struct resource *res,
{
struct device *parent = dax_region->dev;
struct dax_dev *dax_dev;
+ int rc = 0, minor, i;
struct device *dev;
struct cdev *cdev;
- int rc, minor;
dev_t dev_t;
dax_dev = kzalloc(sizeof(*dax_dev) + sizeof(*res) * count, GFP_KERNEL);
if (!dax_dev)
return -ENOMEM;
+ for (i = 0; i < count; i++) {
+ if (!IS_ALIGNED(res[i].start, dax_region->align)
+ || !IS_ALIGNED(resource_size(&res[i]),
+ dax_region->align)) {
+ rc = -EINVAL;
+ break;
+ }
+ dax_dev->res[i].start = res[i].start;
+ dax_dev->res[i].end = res[i].end;
+ }
+
+ if (i < count)
+ goto err_id;
+
dax_dev->id = ida_simple_get(&dax_region->ida, 0, 0, GFP_KERNEL);
if (dax_dev->id < 0) {
rc = dax_dev->id;
@@ -601,7 +618,6 @@ int devm_create_dax_dev(struct dax_region *dax_region, struct resource *res,
goto err_cdev;
/* from here on we're committed to teardown via dax_dev_release() */
- memcpy(dax_dev->res, res, sizeof(*res) * count);
dax_dev->num_resources = count;
dax_dev->alive = true;
dax_dev->region = dax_region;