linux-kernel - Re: [PATCH v3] ima: detect changes to the backing overlay file

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Date:   Wed, 25 Oct 2023 08:59:13 -0600
From:   Raul Rangel <rrangel@...omium.org>
To:     Mimi Zohar <zohar@...ux.ibm.com>
Cc:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        Eric Snowberg <eric.snowberg@...cle.com>,
        Amir Goldstein <amir73il@...il.com>
Subject: Re: [PATCH v3] ima: detect changes to the backing overlay file

On Wed, Oct 25, 2023 at 8:39 AM Mimi Zohar <zohar@...ux.ibm.com> wrote:
> +               if (!IS_I_VERSION(backing_inode) ||
> +                   backing_inode->i_sb->s_dev != iint->real_dev ||
> +                   backing_inode->i_ino != iint->real_ino ||
> +                   !inode_eq_iversion(backing_inode, iint->version)) {
> +                       iint->flags &= ~IMA_DONE_MASK;
> +                       iint->measured_pcrs = 0;
> +               }
> +       }
> +
Does this mean I need to mount ext4 with `-o iversion`? Or has it been
enabled by default?

I can test this patch out sometime this week and verify it fixes the
performance regression.

Thanks!