summaryrefslogtreecommitdiff
path: root/fs/namei.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2016-10-15 03:23:33 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-15 03:23:33 +0300
commit1a892b485f328224b4882818f84fcc0a3208677d (patch)
treec0ec8fd39c2cdcb00996ac42e7f253f8157cf41d /fs/namei.c
parent5d89d9f502f9c33ed0270d716f238429861e1942 (diff)
parent7764235becf3b72bd124400fbffe670531322135 (diff)
downloadlinux-1a892b485f328224b4882818f84fcc0a3208677d.tar.xz
Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
Pull overlayfs updates from Miklos Szeredi: "This update contains fixes to the "use mounter's permission to access underlying layers" area, and miscellaneous other fixes and cleanups. No new features this time" * 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs: ovl: use vfs_get_link() vfs: add vfs_get_link() helper ovl: use generic_readlink ovl: explain error values when removing acl from workdir ovl: Fix info leak in ovl_lookup_temp() ovl: during copy up, switch to mounter's creds early ovl: lookup: do getxattr with mounter's permission ovl: copy_up_xattr(): use strnlen
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/namei.c b/fs/namei.c
index a7f601cd521a..5b4eed221530 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4668,6 +4668,31 @@ int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
}
EXPORT_SYMBOL(generic_readlink);
+/**
+ * vfs_get_link - get symlink body
+ * @dentry: dentry on which to get symbolic link
+ * @done: caller needs to free returned data with this
+ *
+ * Calls security hook and i_op->get_link() on the supplied inode.
+ *
+ * It does not touch atime. That's up to the caller if necessary.
+ *
+ * Does not work on "special" symlinks like /proc/$$/fd/N
+ */
+const char *vfs_get_link(struct dentry *dentry, struct delayed_call *done)
+{
+ const char *res = ERR_PTR(-EINVAL);
+ struct inode *inode = d_inode(dentry);
+
+ if (d_is_symlink(dentry)) {
+ res = ERR_PTR(security_inode_readlink(dentry));
+ if (!res)
+ res = inode->i_op->get_link(dentry, inode, done);
+ }
+ return res;
+}
+EXPORT_SYMBOL(vfs_get_link);
+
/* get the link contents into pagecache */
const char *page_get_link(struct dentry *dentry, struct inode *inode,
struct delayed_call *callback)