linux-kernel - Re: [PATCH 2/4] aio: Remove the now superfluous sentinel elements from ctl

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Date:   Thu, 9 Nov 2023 22:12:12 +0100
From:   Joel Granados <j.granados@...sung.com>
To:     Eric Biggers <ebiggers@...nel.org>
CC:     Luis Chamberlain <mcgrof@...nel.org>, <willy@...radead.org>,
        <josh@...htriplett.org>, Kees Cook <keescook@...omium.org>,
        David Howells <dhowells@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Benjamin LaHaise <bcrl@...ck.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...nel.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        Jeff Layton <jlayton@...nel.org>, Neil Brown <neilb@...e.de>,
        Olga Kornievskaia <kolga@...app.com>,
        Dai Ngo <Dai.Ngo@...cle.com>, Tom Talpey <tom@...pey.com>,
        Jan Kara <jack@...e.cz>, Amir Goldstein <amir73il@...il.com>,
        Matthew Bobrowski <repnop@...gle.com>,
        Anton Altaparmakov <anton@...era.com>,
        Namjae Jeon <linkinjeon@...nel.org>,
        Mark Fasheh <mark@...heh.com>,
        Joel Becker <jlbec@...lplan.org>,
        Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Iurii Zaikin <yzaikin@...gle.com>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        Chandan Babu R <chandan.babu@...cle.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Jan Harkes <jaharkes@...cmu.edu>, <coda@...cmu.edu>,
        <linux-cachefs@...hat.com>, <linux-kernel@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-aio@...ck.org>,
        <linux-mm@...ck.org>, <linux-nfs@...r.kernel.org>,
        <linux-ntfs-dev@...ts.sourceforge.net>,
        <ocfs2-devel@...ts.linux.dev>, <fsverity@...ts.linux.dev>,
        <linux-xfs@...r.kernel.org>, <codalist@...emann.coda.cs.cmu.edu>
Subject: Re: [PATCH 2/4] aio: Remove the now superfluous sentinel elements
 from ctl_table array

On Thu, Nov 09, 2023 at 08:08:31AM -0800, Eric Biggers wrote:
> On Thu, Nov 09, 2023 at 05:00:40PM +0100, Joel Granados wrote:
> > > >  static void __init fsverity_init_sysctl(void)
> > > >  {
> > > > +#ifdef CONFIG_FS_VERITY_BUILTIN_SIGNATURES
> > > >  	fsverity_sysctl_header = register_sysctl("fs/verity",
> > > >  						 fsverity_sysctl_table);
> > > > +#else
> > > > +	fsverity_sysctl_header = register_sysctl_sz("fs/verity",
> > > > +						 fsverity_sysctl_table, 0);
> > > > +#endif
> > > >  	if (!fsverity_sysctl_header)
> > > >  		panic("fsverity sysctl registration failed");
> > > 
> > > This does not make sense, and it causes a build error when CONFIG_FS_VERITY=y
> > > and CONFIG_FS_VERITY_BUILTIN_SIGNATURES=n.
> > > 
> > > I think all you need to do is delete the sentinel element, the same as
> > > everywhere else.  I just tested it, and it works fine.
> > I found the reason why I added the CONFIG_FS_VERITY_BUILTIN_SIGNATURES
> > here: it is related to
> > https://lore.kernel.org/all/20230705212743.42180-3-ebiggers@kernel.org/
> > where the directory is registered with an element only if
> > CONFIG_FS_VERITY_BUILTIN_SIGNATURES is defined. I had forgotten, but I
> > even asked for a clarification on the patch :).
> > 
> > I see that that patch made it to v6.6. So the solution is not to remove
> > the CONFIG_FS_VERITY_BUILTIN_SIGNATURES, but for me to rebase on top of
> > a more up to date base.
> > 
> > @Eric: Please get back to me if the patch in
> > https://lore.kernel.org/all/20230705212743.42180-3-ebiggers@kernel.org/
> > is no longer relevant.
> > 
> > Best.
> 
> Yes, that patch was merged in 6.6.  I don't think it really matters here though,
> other than the fact that it moved the code to a different file.  I believe all
> you need to do is remove the sentinel element, the same as anywhere else:
Indeed. I thought that I had to handle empty array in a special way, but
it seems that ARRAY_SIZE works for empty arrays as well. I'll correct
this as well. Thx again for the feedback.

Best
> 
> diff --git a/fs/verity/init.c b/fs/verity/init.c
> index a29f062f6047b..b64a76b9ac362 100644
> --- a/fs/verity/init.c
> +++ b/fs/verity/init.c
> @@ -24,7 +24,6 @@ static struct ctl_table fsverity_sysctl_table[] = {
>  		.extra2         = SYSCTL_ONE,
>  	},
>  #endif
> -	{ }
>  };
>  
>  static void __init fsverity_init_sysctl(void)

-- 

Joel Granados

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