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authorAl Viro <viro@zeniv.linux.org.uk>2011-03-13 15:56:26 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-03-15 02:21:45 -0400
commit65cfc6722361570bfe255698d9cd4dccaf47570d (patch)
treed98ac0a392cf9abc1bbc3363448c8e072504c6a4 /fs/open.c
parentbcda76524cd1fa32af748536f27f674a13e56700 (diff)
readlinkat(), fchownat() and fstatat() with empty relative pathnames
For readlinkat() we simply allow empty pathname; it will fail unless we have dfd equal to O_PATH-opened symlink, so we are outside of POSIX scope here. For fchownat() and fstatat() we allow AT_EMPTY_PATH; let the caller explicitly ask for such behaviour. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/open.c')
-rw-r--r--fs/open.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/open.c b/fs/open.c
index 14a51de01f54..3cac0bda46df 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -573,13 +573,15 @@ SYSCALL_DEFINE5(fchownat, int, dfd, const char __user *, filename, uid_t, user,
573{ 573{
574 struct path path; 574 struct path path;
575 int error = -EINVAL; 575 int error = -EINVAL;
576 int follow; 576 int lookup_flags;
577 577
578 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) 578 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
579 goto out; 579 goto out;
580 580
581 follow = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW; 581 lookup_flags = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
582 error = user_path_at(dfd, filename, follow, &path); 582 if (flag & AT_EMPTY_PATH)
583 lookup_flags |= LOOKUP_EMPTY;
584 error = user_path_at(dfd, filename, lookup_flags, &path);
583 if (error) 585 if (error)
584 goto out; 586 goto out;
585 error = mnt_want_write(path.mnt); 587 error = mnt_want_write(path.mnt);