Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-30 14:52:05 +00:00
Code Issues Packages Projects Releases Wiki Activity

libnvdimm, namespace: fix label initialization to use valid seq numbers

Browse Source 
The set of valid sequence numbers is {1,2,3}. The specification
indicates that an implementation should consider 0 a sign of a critical
error:

    UEFI 2.7: 13.19 NVDIMM Label Protocol

    Software never writes the sequence number 00, so a correctly
    check-summed Index Block with this sequence number probably indicates a
    critical error. When software discovers this case it treats it as an
    invalid Index Block indication.

While the expectation is that the invalid block is just thrown away, the
Robustness Principle says we should fix this to make both sequence
numbers valid.

Fixes: f524bf271a ("libnvdimm: write pmem label set")
Cc: <stable@vger.kernel.org>
Reported-by: Juston Li <juston.li@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2017-09-26 11:41:28 -07:00
parent 26417ae4fc
commit b18d4b8a25
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/nvdimm/label.c
View File

@ -1050,7 +1050,7 @@ static int init_labels(struct nd_mapping *nd_mapping, int num_labels)
nsindex = to_namespace_index(ndd, 0);
memset(nsindex, 0, ndd->nsarea.config_size);
for (i = 0; i < 2; i++) {
int rc = nd_label_write_index(ndd, i, i*2, ND_NSINDEX_INIT);
int rc = nd_label_write_index(ndd, i, 3 - i, ND_NSINDEX_INIT);
if (rc)
return rc;