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| author | Dan Williams <dan.j.williams@intel.com> | 2016-12-07 04:03:35 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2016-12-07 04:42:37 +0300 |
| commit | 325896ffdf90f7cbd59fb873b7ba20d60d1ddf3c (patch) | |
| tree | d71d337b3a5b9858907c6a4a0797ced074302590 /drivers/nvdimm/pmem.c | |
| parent | a7de92dac9f0dbf01deb56fe1d661d7baac097e1 (diff) | |
| download | linux-325896ffdf90f7cbd59fb873b7ba20d60d1ddf3c.tar.xz | |
device-dax: fix private mapping restriction, permit read-only
Hugh notes in response to commit 4cb19355ea19 "device-dax: fail all
private mapping attempts":
"I think that is more restrictive than you intended: haven't tried, but I
believe it rejects a PROT_READ, MAP_SHARED, O_RDONLY fd mmap, leaving no
way to mmap /dev/dax without write permission to it."
Indeed it does restrict read-only mappings, switch to checking
VM_MAYSHARE, not VM_SHARED.
Cc: <stable@vger.kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Pawel Lebioda <pawel.lebioda@intel.com>
Fixes: 4cb19355ea19 ("device-dax: fail all private mapping attempts")
Reported-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/pmem.c')
0 files changed, 0 insertions, 0 deletions