linux-kernel - Re: [PATCH v3 1/1] vfs: iversion truncate bug fix

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Date:	Fri, 13 Jan 2012 12:13:59 +0200
From:	"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Greg KH <greg@...ah.com>, linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/1] vfs: iversion truncate bug fix

On Fri, Jan 6, 2012 at 12:30 AM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Thu, 05 Jan 2012 10:39:41 -0800
> James Bottomley <James.Bottomley@...senPartnership.com> wrote:
>
>> > > Please, go read Documentation/stable_kernel_rules.txt for how to
>> > > properly submit patches to the stable kernel tree.  The information here
>> > > needs to be in the patch changelog itself, not in some random email
>> > > thread that will get lost instantly into my email-archive-from-hell
>> > > after I am done reading this.
>> > >
>> > > greg k-h
>> >
>> > Yes, I've read Documentation/stable_kernel_rules.txt and think this
>> > patch meets the criteria for being backported.
>> >
>> > As far as I'm aware, this patch hasn't been upstreamed yet and is
>> > waiting for someone, besides myself, to Ack it.  Once Acked, either
>> > Dmitry or I can send a pull request with an updated patch description.
>> > Should this patch go in via the security tree?
>>
>> If it hasn't been upstreamed yet, just make sure you put
>>
>> cc: stable@...nel.org
>>
>> In the signoffs of the patch you're sending upstream and the backport
>> will occur automatically when the patch is finally upstreamed.
>
> Mimi didn't write or send the patch.
>
> This happily git-free maintainer simply goes in and edits the
> changelog.  I do this very very frequently.
>
>
> Here's what I currently have.  I plan to send this to Rip Van Viro.
>
>

Hello,

Should I do anything about re-submitting this patch now?
Or it went forward already?

Thanks,
Dmitry

>
>
> From: Dmitry Kasatkin <dmitry.kasatkin@...el.com>
> Subject: vfs: increment iversion when a file is truncated
>
> When a file is truncated with truncate()/ftruncate() and then closed,
> iversion is not updated.  This patch uses ATTR_SIZE flag as an indication
> to increment iversion.
>
> Mimi said:
>
> On fput(), i_version is used to detect and flag files that have changed
> and need to be re-measured in the IMA measurement policy.  When a file
> is truncated with truncate()/ftruncate() and then closed, i_version is
> not updated.  As a result, although the file has changed, it will not be
> re-measured and added to the IMA measurement list on subsequent access.
>
> Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@...el.com>
> Acked-by: Mimi Zohar <zohar@...ibm.com>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
>
>  fs/attr.c |    5 +++++
>  1 file changed, 5 insertions(+)
>
> diff -puN fs/attr.c~vfs-increment-iversion-when-a-file-is-truncated fs/attr.c
> --- a/fs/attr.c~vfs-increment-iversion-when-a-file-is-truncated
> +++ a/fs/attr.c
> @@ -176,6 +176,11 @@ int notify_change(struct dentry * dentry
>                        return -EPERM;
>        }
>
> +       if ((ia_valid & ATTR_SIZE) && IS_I_VERSION(inode)) {
> +               if (attr->ia_size != inode->i_size)
> +                       inode_inc_iversion(inode);
> +       }
> +
>        if ((ia_valid & ATTR_MODE)) {
>                umode_t amode = attr->ia_mode;
>                /* Flag setting protected by i_mutex */
> _
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