linux-kernel - Re: [PATCH v2] fs: Fix page

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Date:   Fri, 29 Nov 2019 17:06:34 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Andreas Gruenbacher <agruenba@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jeff Layton <jlayton@...nel.org>, Sage Weil <sage@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Richard Weinberger <richard@....at>,
        Artem Bityutskiy <dedekind1@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        ceph-devel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-mtd@...ts.infradead.org, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org
Subject: Re: [PATCH v2] fs: Fix page_mkwrite off-by-one errors

On Fri, Nov 29, 2019 at 03:20:45PM +0100, Andreas Gruenbacher wrote:
> The check in block_page_mkwrite meant to determine whether an offset is
> within the inode size is off by one.  This bug has spread to
> iomap_page_mkwrite and to several filesystems (ubifs, ext4, f2fs, ceph).
> To fix that, introduce a new page_mkwrite_check_truncate helper that
> checks for truncate and computes the bytes in the page up to EOF, and
> use that helper in the above mentioned filesystems and in btrfs.
> 
> Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com>
> 
> ---
> 
> This patch has a trivial conflict with commit "iomap: Fix overflow in
> iomap_page_mkwrite" in Darrick's iomap pull request for 5.5:
> 
>   https://lore.kernel.org/lkml/20191125190907.GN6219@magnolia/
> ---
>  fs/btrfs/inode.c        | 15 ++++-----------

For the btrfs part

Acked-by: David Sterba <dsterba@...e.com>

and reviewed that the change is equivalent.