Re: [PATCH] block: Add config option to not allow writing to mounted devices

Jan Kara
2023-06-12T16:25:51Z

On Mon 12-06-23 18:16:14, Jan Kara wrote:
> Writing to mounted devices is dangerous and can lead to filesystem
> corruption as well as crashes. Furthermore syzbot comes with more and
> more involved examples how to corrupt block device under a mounted
> filesystem leading to kernel crashes and reports we can do nothing
> about. Add config option to disallow writing to mounted (exclusively
> open) block devices. Syzbot can use this option to avoid uninteresting
> crashes. Also users whose userspace setup does not need writing to
> mounted block devices can set this config option for hardening.
>
> Link: https://lore.kernel.org/all/60788e5d-5c7c-1142-e554-c21d709acfd9@linaro.org
> Signed-off-by: Jan Kara <jack@suse.cz>

Please disregard this patch. I had uncommited fixups in my tree. I'll send
fixed version shortly. I'm sorry for the noise.

Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR