linux-kernel - Re: [RFC][PATCH 2/4] lsm: Add missing return values doc in lsm

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Date:   Tue, 15 Nov 2022 21:23:03 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     Roberto Sassu <roberto.sassu@...weicloud.com>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        martin.lau@...ux.dev, song@...nel.org, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, revest@...omium.org,
        jackmanb@...omium.org, jmorris@...ei.org, serge@...lyn.com,
        bpf@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [RFC][PATCH 2/4] lsm: Add missing return values doc in
 lsm_hooks.h and fix formatting

On Tue, Nov 15, 2022 at 12:57 PM Roberto Sassu
<roberto.sassu@...weicloud.com> wrote:
>
> From: Roberto Sassu <roberto.sassu@...wei.com>
>
> Ensure that for non-void LSM hooks there is a description of the return
> values. Also replace spaces with tab for indentation, remove empty lines
> between the hook description and the list of parameters and add the period
> at the end of the parameter description.
>
> Finally, replace the description of the sb_parse_opts_str hook, which was
> removed with commit 757cbe597fe8 ("LSM: new method: ->sb_add_mnt_opt()"),
> with one for the new hook sb_add_mnt_opt.
>
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> ---
>  include/linux/lsm_hooks.h | 123 ++++++++++++++++++++++++++------------
>  1 file changed, 86 insertions(+), 37 deletions(-)

...

> diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
> index f40b82ca91e7..c0c570b7eabd 100644
> --- a/include/linux/lsm_hooks.h
> +++ b/include/linux/lsm_hooks.h
> @@ -176,18 +183,22 @@
>   *     Set the security relevant mount options used for a superblock
>   *     @sb the superblock to set security mount options for
>   *     @opts binary data structure containing all lsm mount data
> + *     Return 0 on success, error on failure.
>   * @sb_clone_mnt_opts:
>   *     Copy all security options from a given superblock to another
>   *     @oldsb old superblock which contain information to clone
>   *     @newsb new superblock which needs filled in
> - * @sb_parse_opts_str:
> - *     Parse a string of security data filling in the opts structure
> - *     @options string containing all mount options known by the LSM
> - *     @opts binary data structure usable by the LSM
> + *     Return 0 on success, error on failure.
> + * @add_mnt_opt:
> + *     Add a new mount option @option with value @val and length @len to the
> + *     existing mount options @mnt_opts.
> + *     Return 0 if the option was successfully added, a negative value
> + *     otherwise.

I really appreciate the effort to improve the LSM hook comments/docs,
but the "sb_add_mnt_opt" hook was removed in 52f982f00b22
("security,selinux: remove security_add_mnt_opt()").

-- 
paul-moore.com