CRED: Add some configurable debugging [try #6]

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / open.c

diff --git a/fs/open.c b/fs/open.c
index dd98e8076024d638cb0987b57b24269d20588587..31191bf513e40ebcbd05668cc0db2bc46c1c1311 100644 (file)
--- a/fs/open.c
+++ b/fs/open.c
@@ -199,7 +199,7 @@ out:
 int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
        struct file *filp)
 {
-       int err;
+       int ret;
        struct iattr newattrs;
 
        /* Not pretty: "inode->i_size" shouldn't really be signed. But it is. */
@@ -214,12 +214,14 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
        }
 
        /* Remove suid/sgid on truncate too */
-       newattrs.ia_valid |= should_remove_suid(dentry);
+       ret = should_remove_suid(dentry);
+       if (ret)
+               newattrs.ia_valid |= ret | ATTR_FORCE;
 
        mutex_lock(&dentry->d_inode->i_mutex);
-       err = notify_change(dentry, &newattrs);
+       ret = notify_change(dentry, &newattrs);
        mutex_unlock(&dentry->d_inode->i_mutex);
-       return err;
+       return ret;
 }
 
 static long do_sys_truncate(const char __user *pathname, loff_t length)
@@ -957,6 +959,8 @@ struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags,
        int error;
        struct file *f;
 
+       validate_creds(cred);
+
        /*
         * We must always pass in a valid mount pointer.   Historically
         * callers got away with not passing it, but we must enforce this at