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authorDan Williams <dan.j.williams@intel.com>2017-03-01 05:32:48 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-03-15 05:02:47 +0300
commit9ad1571da2c0139db952d8df5a9e4d67a752948b (patch)
tree1c897157243e054ba148e2f09eef4ab1c2d81742 /drivers/nvdimm/nd.h
parenta7b9c9ddb6f457bab2fc8527ffccf16eefba4af4 (diff)
downloadlinux-9ad1571da2c0139db952d8df5a9e4d67a752948b.tar.xz
nfit, libnvdimm: fix interleave set cookie calculation
commit 86ef58a4e35e8fa66afb5898cf6dec6a3bb29f67 upstream. 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. Fixes: eaf961536e16 ("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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvdimm/nd.h')
-rw-r--r--drivers/nvdimm/nd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index d3b2fca8deec..d869236b474f 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -327,6 +327,7 @@ struct nd_region *to_nd_region(struct device *dev);
int nd_region_to_nstype(struct nd_region *nd_region);
int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
+u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region);
void nvdimm_bus_lock(struct device *dev);
void nvdimm_bus_unlock(struct device *dev);
bool is_nvdimm_bus_locked(struct device *dev);