Thread (2 messages) 2 messages, 2 authors, 2024-03-29

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

From: Mimi Zohar <zohar@linux.ibm.com>
Date: 2024-03-29 01:02:56
Also in: linux-integrity, lkml

On Fri, 2024-03-22 at 10:03 -0400, Stefan Berger wrote:
->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.

Link: https://lore.kernel.org/all/20240202182732.GE2087318@ZenIV/ (local)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Thanks, Al, Stefan.

Mimi
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