On 6/12/23 09:25, Jan Kara wrote:
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@xxxxxxxxxx
Signed-off-by: Jan Kara <jack@xxxxxxx>
Please disregard this patch. I had uncommited fixups in my tree. I'll send
fixed version shortly. I'm sorry for the noise.
Have alternatives been configured to making this functionality configurable
at build time only? How about a kernel command line parameter instead of a
config option?
Thanks,
Bart.
