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

On 2021/06/03 18:54, David Sterba wrote:

On Mon, May 31, 2021 at 01:54:53PM +0000, Niklas Cassel wrote:

quoted

From: Niklas Cassel <redacted>

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