| From | Greg Kroah-Hartman <> | Subject | [ 42/68] vfs: make O PATH file descriptors usable for fchdir() | Date | Thu, 12 Jul 2012 16:02:16 -0700 |
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From: Greg KH <gregkh@linuxfoundation.org>
3.0-stable review patch. If anyone has any objections, please let me know.
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From: Linus Torvalds <torvalds@linux-foundation.org>
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>
--- 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; }
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