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

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Message-ID: <YjLk5p1ej3JwFdaJ@iki.fi>
Date:   Thu, 17 Mar 2022 09:36:06 +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 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.

BR, Jarkko