linux-kernel - Re: [PATCH 05/29] btrfs: move btrfs_xattr

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Message-ID: <20231002113752.GL13697@twin.jikos.cz>
Date:   Mon, 2 Oct 2023 13:37:52 +0200
From:   David Sterba <dsterba@...e.cz>
To:     David Sterba <dsterba@...e.cz>
Cc:     Wedson Almeida Filho <wedsonaf@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wedson Almeida Filho <walmeida@...rosoft.com>,
        Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org
Subject: Re: [PATCH 05/29] btrfs: move btrfs_xattr_handlers to .rodata

On Mon, Oct 02, 2023 at 01:28:58PM +0200, David Sterba wrote:
> On Sat, Sep 30, 2023 at 02:00:09AM -0300, Wedson Almeida Filho wrote:
> > From: Wedson Almeida Filho <walmeida@...rosoft.com>
> > 
> > This makes it harder for accidental or malicious changes to
> > btrfs_xattr_handlers at runtime.
> > 
> > Cc: Chris Mason <clm@...com>
> > Cc: Josef Bacik <josef@...icpanda.com>
> > Cc: David Sterba <dsterba@...e.com>
> > Cc: linux-btrfs@...r.kernel.org
> > Signed-off-by: Wedson Almeida Filho <walmeida@...rosoft.com>
> 
> With slightly updated changelog added to misc-next, thanks.

Removed again. I did not notice first that this is part of a larger
series, please also CC the [PATCH 0/N] patch.

There's a warning:

fs/btrfs/super.c: In function ‘btrfs_fill_super’:
fs/btrfs/super.c:1107:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
 1107 |         sb->s_xattr = btrfs_xattr_handlers;
      |                     ^

but the patch changing the type is present in the series.

Please update the changelog of btrfs patch with:

    Add const specifier also to the pointed array members of
    btrfs_xattr_handlers.  This moves the whole structure to the .rodata
    section which makes it harder for accidental or malicious changes to
    btrfs_xattr_handlers at runtime.

or use it for others patches too.