From: Jan Kara <jack@suse.cz>
To: Ritesh Harjani <riteshh@linux.ibm.com>
Cc: linux-ext4@vger.kernel.org, jack@suse.cz, tytso@mit.edu,
adilger@dilger.ca, darrick.wong@oracle.com, hch@infradead.org,
Alexander Viro <viro@zeniv.linux.org.uk>,
Dan Carpenter <dan.carpenter@oracle.com>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
Murphy Zhou <jencce.kernel@gmail.com>,
Miklos Szeredi <miklos@szeredi.hu>,
Amir Goldstein <amir73il@gmail.com>,
linux-fsdevel@vger.kernel.org, linux-unionfs@vger.kernel.org,
syzbot+77fa5bdb65cc39711820@syzkaller.appspotmail.com
Subject: Re: [PATCH 1/5] ext4: Fix EXT4_MAX_LOGICAL_BLOCK macro
Date: Thu, 23 Apr 2020 13:16:36 +0200 [thread overview]
Message-ID: <20200423111636.GH3737@quack2.suse.cz> (raw)
In-Reply-To: <e31dbabc453d1f227371bed6e0cc2f3493b4955f.1587555962.git.riteshh@linux.ibm.com>
On Thu 23-04-20 16:17:53, Ritesh Harjani wrote:
> ext4 supports max number of logical blocks in a file to be 0xffffffff.
> (This is since ext4_extent's ee_block is __le32).
> This means that EXT4_MAX_LOGICAL_BLOCK should be 0xfffffffe (starting
> from 0 logical offset). This patch fixes this.
>
> The issue was seen when ext4 moved to iomap_fiemap API and when
> overlayfs was mounted on top of ext4. Since overlayfs was missing
> filemap_check_ranges(), so it could pass a arbitrary huge length which
> lead to overflow of map.m_len logic.
>
> This patch fixes that.
>
> Fixes: d3b6f23f7167 ("ext4: move ext4_fiemap to use iomap framework")
> Reported-by: syzbot+77fa5bdb65cc39711820@syzkaller.appspotmail.com
> Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
The patch looks good to me. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>
Honza
> ---
> fs/ext4/ext4.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 91eb4381cae5..ad2dbf6e4924 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -722,7 +722,7 @@ enum {
> #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
>
> /* Max logical block we can support */
> -#define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFF
> +#define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
>
> /*
> * Structure of an inode on the disk
> --
> 2.21.0
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2020-04-23 11:16 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-23 10:47 [PATCH 0/5] ext4/overlayfs: fiemap related fixes Ritesh Harjani
2020-04-23 10:47 ` [PATCH 1/5] ext4: Fix EXT4_MAX_LOGICAL_BLOCK macro Ritesh Harjani
2020-04-23 11:16 ` Jan Kara [this message]
2020-04-23 10:47 ` [PATCH 2/5] ext4: Rename fiemap_check_ranges() to make it ext4 specific Ritesh Harjani
2020-04-23 11:17 ` Jan Kara
2020-04-23 10:47 ` [PATCH 3/5] vfs: EXPORT_SYMBOL for fiemap_check_ranges() Ritesh Harjani
2020-04-23 11:18 ` Jan Kara
2020-04-23 10:47 ` [PATCH 4/5] overlayfs: Check for range bounds before calling i_op->fiemap() Ritesh Harjani
2020-04-23 11:19 ` Jan Kara
2020-04-25 8:54 ` Amir Goldstein
2020-04-23 10:47 ` [PATCH 5/5] ext4: Get rid of ext4_fiemap_check_ranges Ritesh Harjani
2020-04-23 11:20 ` Jan Kara
2020-04-24 10:11 ` [PATCH 0/5] ext4/overlayfs: fiemap related fixes Christoph Hellwig
2020-04-24 23:20 ` Ritesh Harjani
2020-04-25 9:11 ` Amir Goldstein
2020-04-25 9:43 ` Christoph Hellwig
2020-04-25 10:49 ` Amir Goldstein
2020-04-25 11:14 ` Ritesh Harjani
2020-04-27 6:28 ` Christoph Hellwig
2020-04-27 10:15 ` Amir Goldstein
2020-04-27 10:38 ` Christoph Hellwig
2020-04-25 17:32 ` Andreas Dilger
2020-04-27 6:42 ` Christoph Hellwig
2020-04-25 9:44 ` Ritesh Harjani
2020-05-19 2:43 ` Murphy Zhou
2020-05-21 6:08 ` Ritesh Harjani
2020-05-22 4:56 ` Murphy Zhou
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