Re: [PATCH 5.15.y] ima: Fix use-after-free on a dentry's dname.name

On Wed, 2024-12-11 at 16:28 +0800, libo.chen.cn@eng.windriver.com wrote:

From: Stefan Berger stefanb@linux.ibm.com

[ Upstream commit be84f32bb2c981ca670922e047cdde1488b233de ]

->d_name.name can change on rename and the earlier value can be freed; there are conditions sufficient to stabilize it (->d_lock on dentry, ->d_lock on its parent, ->i_rwsem exclusive on the parent's inode, rename_lock), but none of those are met at any of the sites. Take a stable snapshot of the name instead.

Thanks, Libo. The backport looks fine.

Mimi