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From 7c0f859e15ad91f6d6921970fc9d48f1f7804bf9 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sat, 7 Jul 2012 10:17:00 -0700
Subject: [PATCH 48/49] vfs: make O_PATH file descriptors usable for
'fchdir()'
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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: Ben Hutchings <ben@decadent.org.uk>
---
fs/open.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/open.c b/fs/open.c
index 22c41b5..e2b5d51 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -396,10 +396,10 @@ 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;
@@ -413,7 +413,7 @@ 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;
}
--
1.7.10
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