ecryptfs: don't allow mmap when the lower fs doesn't support it

ecryptfs: don't allow mmap when the lower fs doesn't support it

[ Upstream commit f0fe970df3838c202ef6c07a4c2b36838ef0a88b ]

There are legitimate reasons to disallow mmap on certain files, notably
in sysfs or procfs.  We shouldn't emulate mmap support on file systems
that don't offer support natively.

CVE-2016-1583

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Cc: stable@vger.kernel.org
[tyhicks: clean up f_op check by using ecryptfs_file_to_lower()]
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
[mainline backport of commit 8c8e669bb8c5f690976883dd3b7a32d605c58d9a]
Change-Id: I47d4d1c3945782ff77bf58259fcafff4d2f7e7b3
Signed-off-by: Jaechul Lee <jcsing.lee@samsung.com>