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linux/drivers/nvdimm
Dan Williams 86ef58a4e3 nfit, libnvdimm: fix interleave set cookie calculation
The interleave-set cookie is a sum that sanity checks the composition of
an interleave set has not changed from when the namespace was initially
created.  The checksum is calculated by sorting the DIMMs by their
location in the interleave-set. The comparison for the sort must be
64-bit wide, not byte-by-byte as performed by memcmp() in the broken
case.

Fix the implementation to accept correct cookie values in addition to
the Linux "memcmp" order cookies, but only allow correct cookies to be
generated going forward. It does mean that namespaces created by
third-party-tooling, or created by newer kernels with this fix, will not
validate on older kernels. However, there are a couple mitigating
conditions:

    1/ platforms with namespace-label capable NVDIMMs are not widely
       available.

    2/ interleave-sets with a single-dimm are by definition not affected
       (nothing to sort). This covers the QEMU-KVM NVDIMM emulation case.

The cookie stored in the namespace label will be fixed by any write the
namespace label, the most straightforward way to achieve this is to
write to the "alt_name" attribute of a namespace in sysfs.

Cc: <stable@vger.kernel.org>
Fixes: eaf961536e ("libnvdimm, nfit: add interleave-set state-tracking infrastructure")
Reported-by: Nicholas Moulin <nicholas.w.moulin@linux.intel.com>
Tested-by: Nicholas Moulin <nicholas.w.moulin@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2017-03-01 00:49:42 -08:00
..
blk.c libnvdimm for 4.8 2016-07-28 17:38:16 -07:00
btt_devs.c nvdimm, btt: add a size attribute for BTTs 2016-08-08 09:26:14 -07:00
btt.c nvdimm, btt: add a size attribute for BTTs 2016-08-08 09:26:14 -07:00
btt.h libnvdimm, btt: consolidate arena validation 2015-08-14 13:43:04 -04:00
bus.c acpi, nfit, libnvdimm: fix / harden ars_status output length handling 2016-12-06 16:08:10 -08:00
claim.c libnvdimm: fix mishandled nvdimm_clear_poison() return value 2016-12-16 08:10:31 -08:00
core.c libnvdimm: use generic iostat interfaces 2016-10-19 08:53:26 -07:00
dax_devs.c libnvdimm, dax: autodetect support 2016-05-20 22:02:57 -07:00
dimm_devs.c libnvdimm: allow a platform to force enable label support 2016-10-19 08:57:33 -07:00
dimm.c libnvdimm: allow a platform to force enable label support 2016-10-19 08:57:33 -07:00
e820.c libnvdimm, e820: use module_platform_driver 2016-12-05 08:52:21 -08:00
Kconfig Linux 4.9-rc4 2016-11-18 16:13:41 -07:00
label.c nvdimm: use the right length of "pmem" 2016-11-11 20:37:42 -08:00
label.h libnvdimm: write blk label set 2015-06-24 21:24:10 -04:00
Makefile libnvdimm, dax: introduce device-dax infrastructure 2016-05-09 15:35:42 -07:00
namespace_devs.c nfit, libnvdimm: fix interleave set cookie calculation 2017-03-01 00:49:42 -08:00
nd-core.h libnvdimm, namespace: allow creation of multiple pmem-namespaces per region 2016-10-07 09:22:53 -07:00
nd.h nfit, libnvdimm: fix interleave set cookie calculation 2017-03-01 00:49:42 -08:00
pfn_devs.c libnvdimm, pfn: fix memmap reservation size versus 4K alignment 2017-02-04 14:47:31 -08:00
pfn.h libnvdimm, dax: autodetect support 2016-05-20 22:02:57 -07:00
pmem.c pmem: return EIO on read_pmem() failure 2017-01-12 16:40:29 -08:00
pmem.h pmem: kill __pmem address space 2016-07-12 19:25:38 -07:00
region_devs.c nfit, libnvdimm: fix interleave set cookie calculation 2017-03-01 00:49:42 -08:00
region.c libnvdimm: keep region data alive over namespace removal 2016-07-11 16:13:41 -07:00