linux-kernel - Re: [PATCH v5] KEYS: Add a list for unreferenced keys

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Message-ID: <Z_MeZ-dC7ugzdkkn@kernel.org>
Date: Mon, 7 Apr 2025 03:37:59 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: keyrings@...r.kernel.org
Cc: Jarkko Sakkinen <jarkko.sakkinen@...nsys.com>, stable@...r.kernel.org,
	David Howells <dhowells@...hat.com>, Lukas Wunner <lukas@...ner.de>,
	Ignat Korchagin <ignat@...udflare.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>,
	Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Mimi Zohar <zohar@...ux.ibm.com>, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH v5] KEYS: Add a list for unreferenced keys

On Mon, Apr 07, 2025 at 03:10:45AM +0300, Jarkko Sakkinen wrote:
> From: Jarkko Sakkinen <jarkko.sakkinen@...nsys.com>
> 
> Add an isolated list of unreferenced keys to be queued for deletion, and
> try to pin the keys in the garbage collector before processing anything.
> Skip unpinnable keys.
> 
> Use this list for blocking the reaping process during the teardown:
> 
> 1. First off, the keys added to `keys_graveyard` are snapshotted, and the
>    list is flushed. This the very last step in `key_put()`.
> 2. `key_put()` reaches zero. This will mark key as busy for the garbage
>    collector.
> 3. `key_garbage_collector()` will try to increase refcount, which won't go
>    above zero. Whenever this happens, the key will be skipped.
> 
> Cc: stable@...r.kernel.org # v6.1+
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...nsys.com>

Rebase went wrong:

https://lore.kernel.org/keyrings/20250407003622.22139-1-jarkko@kernel.org/T/#u

BR, Jarkko