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

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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>
This commit is contained in:
Linus Torvalds 2012-07-07 10:17:00 -07:00
parent cd6407fe22
commit 332a2e1244
1 changed files with 3 additions and 3 deletions
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6
fs/open.c
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@ -397,10 +397,10 @@ SYSCALL_DEFINE1(fchdir, unsigned int, fd)
{ {
struct file *file; struct file *file;
struct inode *inode; struct inode *inode;
int error; int error, fput_needed;
error = -EBADF; error = -EBADF;
file = fget(fd); file = fget_raw_light(fd, &fput_needed);
if (!file) if (!file)
goto out; goto out;
@ -414,7 +414,7 @@ SYSCALL_DEFINE1(fchdir, unsigned int, fd)
if (!error) if (!error)
set_fs_pwd(current->fs, &file->f_path); set_fs_pwd(current->fs, &file->f_path);
out_putf: out_putf:
fput(file); fput_light(file, fput_needed);
out: out:
return error; return error;
} }