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

BugLink: http://bugs.launchpad.net/bugs/1025406

commit 332a2e1244bd08b9e3ecd378028513396a004a24 upstream.

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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/open.c b/fs/open.c
index a540e7bb3a3..e3638449b86 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -400,10 +400,10 @@ SYSCALL_DEFINE1(fchdir, unsigned int, fd)
 {
         struct file *file;
         struct inode *inode;
-        int error;
+        int error, fput_needed;
 
         error = -EBADF;
-        file = fget(fd);
+        file = fget_raw_light(fd, &fput_needed);
         if (!file)
                 goto out;
 
@@ -417,7 +417,7 @@ SYSCALL_DEFINE1(fchdir, unsigned int, fd)
         if (!error)
                 set_fs_pwd(current->fs, &file->f_path);
 out_putf:
-        fput(file);
+        fput_light(file, fput_needed);
 out:
         return error;
 }