Dan Williams 325896ffdf device-dax: fix private mapping restriction, permit read-only ...

Hugh notes in response to commit 4cb19355ea "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: 4cb19355ea ("device-dax: fail all private mapping attempts")
Reported-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

2016-12-06 17:42:37 -08:00

..

dax.c

device-dax: fix private mapping restriction, permit read-only

2016-12-06 17:42:37 -08:00

dax.h

dax: convert devm_create_dax_dev to PTR_ERR

2016-10-07 16:45:59 -07:00

Kconfig

nvdimm: make CONFIG_NVDIMM_DAX 'bool'

2016-10-27 16:16:21 -07:00

Makefile

…

pmem.c

device-dax: check devm_nsio_enable() return value

2016-10-28 14:35:25 -07:00