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authorAl Viro <viro@zeniv.linux.org.uk>2011-03-13 20:56:26 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2011-03-15 07:21:45 +0100
commit65cfc6722361570bfe255698d9cd4dccaf47570d (patch)
treed98ac0a392cf9abc1bbc3363448c8e072504c6a4 /fs/stat.c
parentAllow O_PATH for symlinks (diff)
downloadlinux-65cfc6722361570bfe255698d9cd4dccaf47570d.tar.xz
linux-65cfc6722361570bfe255698d9cd4dccaf47570d.zip
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/stat.c')
-rw-r--r--fs/stat.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/stat.c b/fs/stat.c
index d5c61cf2b703..961039121cb8 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -75,13 +75,16 @@ int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
int error = -EINVAL;
int lookup_flags = 0;
- if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT)) != 0)
+ if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
+ AT_EMPTY_PATH)) != 0)
goto out;
if (!(flag & AT_SYMLINK_NOFOLLOW))
lookup_flags |= LOOKUP_FOLLOW;
if (flag & AT_NO_AUTOMOUNT)
lookup_flags |= LOOKUP_NO_AUTOMOUNT;
+ if (flag & AT_EMPTY_PATH)
+ lookup_flags |= LOOKUP_EMPTY;
error = user_path_at(dfd, filename, lookup_flags, &path);
if (error)
@@ -297,7 +300,7 @@ SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
if (bufsiz <= 0)
return -EINVAL;
- error = user_path_at(dfd, pathname, 0, &path);
+ error = user_path_at(dfd, pathname, LOOKUP_EMPTY, &path);
if (!error) {
struct inode *inode = path.dentry->d_inode;