linux-kernel - Re: [PATCH 2/5] KEYS: user_defined: sanitize key payloads

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Message-ID: <28138.1493043275@warthog.procyon.org.uk>
Date:   Mon, 24 Apr 2017 15:14:35 +0100
From:   David Howells <dhowells@...hat.com>
To:     Eric Biggers <ebiggers3@...il.com>
Cc:     dhowells@...hat.com, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH 2/5] KEYS: user_defined: sanitize key payloads

Eric Biggers <ebiggers3@...il.com> wrote:

> > Add kzfree_rcu()?
> > 
> > David
> 
> We could, but it's not trivial because the way kfree_rcu() works is to store
> the offset of the rcu_head as the callback function, then have a special
> case in RCU reclaim that recognizes "function pointers" with value < 4096
> and call kfree() rather than the function. ...

Okay, that sounds reasonable.

David