Re: [PATCH 2/2] blk-zoned: allow BLKREPORTZONE without CAP_SYS_ADMIN

[Damien Le Moal]

On 2021/06/03 18:54, David Sterba wrote:
> On Mon, May 31, 2021 at 01:54:53PM +0000, Niklas Cassel wrote:
>> From: Niklas Cassel <niklas.cassel@xxxxxxx>
>>
>> Performing a BLKREPORTZONE operation should be allowed under the same
>> permissions as read(). (read() does not require CAP_SYS_ADMIN).
>>
>> Remove the CAP_SYS_ADMIN requirement, and instead check that the fd was
>> successfully opened with FMODE_READ. This way BLKREPORTZONE will match
>> the access control requirement of read().
> 
> Does this mean that a process that does not have read nor write access
> to the device itself (blocks) is capable of reading the zone
> information? Eg. some monitoring tool.

With this change, to do a report zones, the process will only need to have read
access to the device. And if it has read access, it also means that it can read
the zones content.


-- 
Damien Le Moal
Western Digital Research