From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sat, 7 Jul 2012 17:17:00 +0000 (-0700)
Subject: vfs: make O_PATH file descriptors usable for 'fchdir()'
X-Git-Tag: v3.5-rc6~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=332a2e1244bd08b9e3ecd378028513396a004a24;p=pandora-kernel.git

vfs: make O_PATH file descriptors usable for 'fchdir()'

We already use them for openat() and friends, but fchdir() also wants to
be able to use O_PATH file descriptors.  This should make it comparable
to the O_SEARCH of Solaris.  In particular, O_PATH allows you to access
(not-quite-open) a directory you don't have read persmission to, only
execute permission.

Noticed during development of multithread support for ksh93.

Reported-by: ольга крыжановская <olga.kryzhanovska@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@kernel.org    # O_PATH introduced in 3.0+
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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