tree ec4bbe77017ce2002940f2e9c9b502a7abf648d4
parent 6a84fb4b4e439a8ef0ce19ec7e7661ad76f655c9
author Dan Williams <dan.j.williams@intel.com> 1479315638 -0800
committer Dan Williams <dan.j.williams@intel.com> 1479315638 -0800

device-dax: fail all private mapping attempts

The device-dax implementation originally tried to be tricky and allow
private read-only mappings, but in the process allowed writable
MAP_PRIVATE + MAP_NORESERVE mappings.  For simplicity and predictability
just fail all private mapping attempts since device-dax memory is
statically allocated and will never support overcommit.

Cc: <stable@vger.kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Fixes: dee410792419 ("/dev/dax, core: file operations and dax-mmap")
Reported-by: Pawel Lebioda <pawel.lebioda@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>