linux-kernel - Re: [PATCH v1 2/2] certs: Remove panic() calls from system_trusted_keyring

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Date:   Sun, 20 Mar 2022 23:06:20 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Mickaël Salaün <mic@...ikod.net>
Cc:     David Howells <dhowells@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Snowberg <eric.snowberg@...cle.com>,
        Mickaël Salaün <mic@...ux.microsoft.com>,
        Paul Moore <paul@...l-moore.com>, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] certs: Remove panic() calls from
 system_trusted_keyring_init()

On Thu, Mar 17, 2022 at 09:30:02AM +0100, Mickaël Salaün wrote:
> 
> On 17/03/2022 08:36, Jarkko Sakkinen wrote:
> > On Fri, Mar 11, 2022 at 06:47:41PM +0100, Mickaël Salaün wrote:
> > > From: Mickaël Salaün <mic@...ux.microsoft.com>
> > > 
> > > Replace panic() calls from device_initcall(system_trusted_keyring_init)
> > > with proper error handling using -ENODEV.
> > > 
> > > Suggested-by: Jarkko Sakkinen <jarkko@...nel.org> [1]
> > > Link: https://lore.kernel.org/r/Yik0C2t7G272YZ73@iki.fi [1]
> > > Signed-off-by: Mickaël Salaün <mic@...ux.microsoft.com>
> > > Link: https://lore.kernel.org/r/20220311174741.250424-3-mic@digikod.net
> > > ---
> > >   certs/system_keyring.c | 26 ++++++++++++++++++++------
> > >   1 file changed, 20 insertions(+), 6 deletions(-)
> > > 
> > > diff --git a/certs/system_keyring.c b/certs/system_keyring.c
> > > index 05b66ce9d1c9..428046a7aa7f 100644
> > > --- a/certs/system_keyring.c
> > > +++ b/certs/system_keyring.c
> > > @@ -148,8 +148,10 @@ static __init int system_trusted_keyring_init(void)
> > >   			      KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH),
> > >   			      KEY_ALLOC_NOT_IN_QUOTA,
> > >   			      NULL, NULL);
> > > -	if (IS_ERR(builtin_trusted_keys))
> > > -		panic("Can't allocate builtin trusted keyring\n");
> > > +	if (IS_ERR(builtin_trusted_keys)) {
> > > +		pr_err("Can't allocate builtin trusted keyring\n");
> > > +		return -ENODEV;
> > > +	}
> > >   #ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
> > >   	secondary_trusted_keys =
> > > @@ -161,14 +163,26 @@ static __init int system_trusted_keyring_init(void)
> > >   			      KEY_ALLOC_NOT_IN_QUOTA,
> > >   			      get_builtin_and_secondary_restriction(),
> > >   			      NULL);
> > > -	if (IS_ERR(secondary_trusted_keys))
> > > -		panic("Can't allocate secondary trusted keyring\n");
> > > +	if (IS_ERR(secondary_trusted_keys)) {
> > > +		pr_err("Can't allocate secondary trusted keyring\n");
> > > +		goto err_secondary;
> > > +	}
> > > -	if (key_link(secondary_trusted_keys, builtin_trusted_keys) < 0)
> > > -		panic("Can't link trusted keyrings\n");
> > > +	if (key_link(secondary_trusted_keys, builtin_trusted_keys) < 0) {
> > > +		pr_err("Can't link trusted keyrings\n");
> > > +		goto err_link;
> > > +	}
> > >   #endif
> > >   	return 0;
> > > +
> > > +err_link:
> > > +	key_put(secondary_trusted_keys);
> > > +
> > > +err_secondary:
> > > +	key_put(builtin_trusted_keys);
> > > +
> > > +	return -ENODEV;
> > >   }
> > >   /*
> > > -- 
> > > 2.35.1
> > > 
> > 
> > Changes make sense to me but you should implement all this to the original
> > patch set.
> 
> You agreed to add this patch on top of the others a few days ago: https://lore.kernel.org/r/f8b1ea77afe8d6698b4a2122254ff8be310412b1.camel@kernel.org
> 
> What do you think about Paul's concerns?

Yes, but I missed this part.

I think the right call would be to include Paul's concerns documented.

BR, Jarkko