introduce new LSM hooks where vfsmount is available.

Add new LSM hooks for path-based checks.  Call them on directory-modifying
operations at the points where we still know the vfsmount involved.

Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/open.c b/fs/open.c
index c0a426d5766c..1cd7d40e9991 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -272,6 +272,8 @@ static long do_sys_truncate(const char __user *pathname, loff_t length)
                 goto put_write_and_out;
 
         error = locks_verify_truncate(inode, NULL, length);
+        if (!error)
+                error = security_path_truncate(&path, length, 0);
         if (!error) {
                 DQUOT_INIT(inode);
                 error = do_truncate(path.dentry, length, 0, NULL);
@@ -329,6 +331,9 @@ static long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
 
         error = locks_verify_truncate(inode, file, length);
         if (!error)
+                error = security_path_truncate(&file->f_path, length,
+                                               ATTR_MTIME|ATTR_CTIME);
+        if (!error)
                 error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, file);
 out_putf:
         fput(file);