From: Karel Zak <kzak@redhat.com>
To: Sami Kerola <kerolasa@iki.fi>
Cc: util-linux@vger.kernel.org
Subject: Re: [PATCH 08/12] mkfs.bfs: fix block device open race
Date: Mon, 9 Nov 2015 09:48:54 +0100 [thread overview]
Message-ID: <20151109084854.GO19508@ws.net.home> (raw)
In-Reply-To: <1446319284-24778-9-git-send-email-kerolasa@iki.fi>
On Sat, Oct 31, 2015 at 07:21:20PM +0000, Sami Kerola wrote:
> This fix makes mkfs.bfs also to detect if block device is busy, and warn if
> the device is misaligned.
>
> Signed-off-by: Sami Kerola <kerolasa@iki.fi>
> ---
> disk-utils/mkfs.bfs.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/disk-utils/mkfs.bfs.c b/disk-utils/mkfs.bfs.c
> index 7057194..139130e 100644
> --- a/disk-utils/mkfs.bfs.c
> +++ b/disk-utils/mkfs.bfs.c
> @@ -187,7 +187,7 @@ int main(int argc, char **argv)
> if (!S_ISBLK(statbuf.st_mode))
> errx(EXIT_FAILURE, _("%s is not a block special device"), device);
>
> - fd = open(device, O_RDWR | O_EXCL);
> + fd = open_blkdev_or_file(device, O_RDWR);
It seems code assumes block devices only, why we need _or_file()
here? It would be enough to check statbuf and fstat(fd) for inode
number if you want to avoid races.
Karel
--
Karel Zak <kzak@redhat.com>
http://karelzak.blogspot.com
next prev parent reply other threads:[~2015-11-09 8:48 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-31 19:21 [PATCH 00/12] pull: race fixes Sami Kerola
2015-10-31 19:21 ` [PATCH 01/12] login: fix stat(2) race Sami Kerola
2015-10-31 19:21 ` [PATCH 02/12] swapon: fix stat(3) and open(3) race Sami Kerola
2015-10-31 19:21 ` [PATCH 03/12] fsck: retire stat(3) when access(3) does better job Sami Kerola
2015-10-31 19:21 ` [PATCH 04/12] agetty: fix chown(3), chmod(3) and open(3) race Sami Kerola
2015-11-09 9:01 ` Karel Zak
2015-10-31 19:21 ` [PATCH 05/12] script, hwclock: check file exist with access(3) rather than stat(3) Sami Kerola
2015-11-09 8:43 ` Karel Zak
2015-10-31 19:21 ` [PATCH 06/12] lib/fileutils: add is_same_inode() check Sami Kerola
2015-11-09 8:54 ` Karel Zak
2015-10-31 19:21 ` [PATCH 07/12] include/blkdev: add open_blkdev_or_file() function Sami Kerola
2015-11-09 8:51 ` Karel Zak
2015-11-22 21:27 ` Sami Kerola
2015-10-31 19:21 ` [PATCH 08/12] mkfs.bfs: fix block device open race Sami Kerola
2015-11-09 8:48 ` Karel Zak [this message]
2015-11-22 21:24 ` Sami Kerola
2015-10-31 19:21 ` [PATCH 09/12] mkfs.minix: " Sami Kerola
2015-10-31 19:21 ` [PATCH 10/12] mkswap: " Sami Kerola
2015-10-31 19:21 ` [PATCH 11/12] mesg: fix multiple races Sami Kerola
2015-10-31 19:21 ` [PATCH 12/12] fdformat: fix block device open race Sami Kerola
2015-11-09 8:58 ` [PATCH 00/12] pull: race fixes Karel Zak
2015-12-02 9:54 ` Karel Zak
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