Hi,
I was asked if we can add this patch to our kernel in Fedora.
It's for ability to open a directory with execute permission but without
read permission.
Michal
-------- Original Message --------
Michal, can you ask the Fedora Linux kernel people to backport this
patch, please (this is going to be needed by both ksh93 and KDE4)?
Josh
---------- Forwarded message ----------
From: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
Date: Thu, Jul 12, 2012 at 7:51 PM
Subject: [ 42/68] vfs: make O_PATH file descriptors usable for fchdir()
To: linux-kernel@xxxxxxxxxxxxxxx, stable@xxxxxxxxxxxxxxx
Cc: torvalds@xxxxxxxxxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx,
alan@xxxxxxxxxxxxxxxxxxx, Al Viro <viro@xxxxxxxxxxxxxxxxxx>
3.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/open.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- 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;
}
Josh
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