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authorLinus Torvalds <torvalds@linux-foundation.org>2012-07-07 13:17:00 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-07 20:19:02 -0400
commit332a2e1244bd08b9e3ecd378028513396a004a24 (patch)
tree7524ffece22d3a7db3555d1df2e1d1d9370da9dd /fs/open.c
parentcd6407fe220c5cf26c117457f5bcdfd6a81fbef8 (diff)
vfs: make O_PATH file descriptors usable for 'fchdir()'
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>
Diffstat (limited to 'fs/open.c')
-rw-r--r--fs/open.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/open.c b/fs/open.c
index d6c79a0dffc7..1540632d8387 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -397,10 +397,10 @@ SYSCALL_DEFINE1(fchdir, unsigned int, fd)
397{ 397{
398 struct file *file; 398 struct file *file;
399 struct inode *inode; 399 struct inode *inode;
400 int error; 400 int error, fput_needed;
401 401
402 error = -EBADF; 402 error = -EBADF;
403 file = fget(fd); 403 file = fget_raw_light(fd, &fput_needed);
404 if (!file) 404 if (!file)
405 goto out; 405 goto out;
406 406
@@ -414,7 +414,7 @@ SYSCALL_DEFINE1(fchdir, unsigned int, fd)
414 if (!error) 414 if (!error)
415 set_fs_pwd(current->fs, &file->f_path); 415 set_fs_pwd(current->fs, &file->f_path);
416out_putf: 416out_putf:
417 fput(file); 417 fput_light(file, fput_needed);
418out: 418out:
419 return error; 419 return error;
420} 420}