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Message-Id: <20171227164616.944455981@linuxfoundation.org> Date: Wed, 27 Dec 2017 17:46:43 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Jane Chu <jane.chu@...cle.com>, Dan Williams <dan.j.williams@...el.com> Subject: [PATCH 4.14 70/74] libnvdimm, pfn: fix start_pad handling for aligned namespaces 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dan Williams <dan.j.williams@...el.com> commit 19deaa217bc04e83b59b5e8c8229eb0e53ad9efc upstream. The alignment checks at pfn driver startup fail to properly account for the 'start_pad' in the case where the namespace is misaligned relative to its internal alignment. This is typically triggered in 1G aligned namespace, but could theoretically trigger with small namespace alignments. When this triggers the kernel reports messages of the form: dax2.1: bad offset: 0x3c000000 dax disabled align: 0x40000000 Fixes: 1ee6667cd8d1 ("libnvdimm, pfn, dax: fix initialization vs autodetect...") Reported-by: Jane Chu <jane.chu@...cle.com> Signed-off-by: Dan Williams <dan.j.williams@...el.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/nvdimm/pfn_devs.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/drivers/nvdimm/pfn_devs.c +++ b/drivers/nvdimm/pfn_devs.c @@ -364,9 +364,9 @@ struct device *nd_pfn_create(struct nd_r int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig) { u64 checksum, offset; - unsigned long align; enum nd_pfn_mode mode; struct nd_namespace_io *nsio; + unsigned long align, start_pad; struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; struct nd_namespace_common *ndns = nd_pfn->ndns; const u8 *parent_uuid = nd_dev_to_uuid(&ndns->dev); @@ -410,6 +410,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pf align = le32_to_cpu(pfn_sb->align); offset = le64_to_cpu(pfn_sb->dataoff); + start_pad = le32_to_cpu(pfn_sb->start_pad); if (align == 0) align = 1UL << ilog2(offset); mode = le32_to_cpu(pfn_sb->mode); @@ -468,7 +469,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pf return -EBUSY; } - if ((align && !IS_ALIGNED(offset, align)) + if ((align && !IS_ALIGNED(nsio->res.start + offset + start_pad, align)) || !IS_ALIGNED(offset, PAGE_SIZE)) { dev_err(&nd_pfn->dev, "bad offset: %#llx dax disabled align: %#lx\n",
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