tree 7524ffece22d3a7db3555d1df2e1d1d9370da9dd
parent cd6407fe220c5cf26c117457f5bcdfd6a81fbef8
author Linus Torvalds <torvalds@linux-foundation.org> 1341681420 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1341706742 -0700

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>