summaryrefslogtreecommitdiff
path: root/drivers/nvdimm/namespace_devs.c
diff options
context:
space:
mode:
authorDan Williams <dan.j.williams@intel.com>2020-02-28 08:39:23 +0300
committerDan Williams <dan.j.williams@intel.com>2020-03-17 22:23:21 +0300
commit6acd7d5ef264d8e9a8988cebf6eeb3567eaf60c6 (patch)
tree38b3ebe83d3d4dbd380c7da6e7769f8a17c92463 /drivers/nvdimm/namespace_devs.c
parentb2ba7e91fa81bec9b64c47ab852145559cad2b68 (diff)
downloadlinux-6acd7d5ef264d8e9a8988cebf6eeb3567eaf60c6.tar.xz
libnvdimm/namespace: Enforce memremap_compat_align()
The pmem driver on PowerPC crashes with the following signature when instantiating misaligned namespaces that map their capacity via memremap_pages(). BUG: Unable to handle kernel data access at 0xc001000406000000 Faulting instruction address: 0xc000000000090790 NIP [c000000000090790] arch_add_memory+0xc0/0x130 LR [c000000000090744] arch_add_memory+0x74/0x130 Call Trace: arch_add_memory+0x74/0x130 (unreliable) memremap_pages+0x74c/0xa30 devm_memremap_pages+0x3c/0xa0 pmem_attach_disk+0x188/0x770 nvdimm_bus_probe+0xd8/0x470 With the assumption that only memremap_pages() has alignment constraints, enforce memremap_compat_align() for pmem_should_map_pages(), nd_pfn, and nd_dax cases. This includes preventing the creation of namespaces where the base address is misaligned and cases there infoblock padding parameters are invalid. Reported-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Cc: Jeff Moyer <jmoyer@redhat.com> Fixes: a3619190d62e ("libnvdimm/pfn: stop padding pmem namespaces to section alignment") Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/namespace_devs.c')
-rw-r--r--drivers/nvdimm/namespace_devs.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 032dc61725ff..77e211c7d94d 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -10,6 +10,7 @@
#include <linux/nd.h>
#include "nd-core.h"
#include "pmem.h"
+#include "pfn.h"
#include "nd.h"
static void namespace_io_release(struct device *dev)
@@ -1739,6 +1740,22 @@ struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
return ERR_PTR(-ENODEV);
}
+ /*
+ * Note, alignment validation for fsdax and devdax mode
+ * namespaces happens in nd_pfn_validate() where infoblock
+ * padding parameters can be applied.
+ */
+ if (pmem_should_map_pages(dev)) {
+ struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
+ struct resource *res = &nsio->res;
+
+ if (!IS_ALIGNED(res->start | (res->end + 1),
+ memremap_compat_align())) {
+ dev_err(&ndns->dev, "%pr misaligned, unable to map\n", res);
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+ }
+
if (is_namespace_pmem(&ndns->dev)) {
struct nd_namespace_pmem *nspm;