room upgrade doesn't transfer non-standard power structure

[grinapo]

Description

A room with nonstandard power structure cannot be upgraded, since the power levels are not moved over. In fact, upgrade results:

{
    "errcode": "M_FORBIDDEN",
    "error": "You don't have permission to add ops level greater than your own"
}

Steps to reproduce

• crate a room with various levels above 100, with owners and members above, too.
• room/.../upgrade (I have used from v5 to v5)
• kaboom

Version information

• Homeserver: grin.hu
• Version: 1.0.0
• Install method: self-hacked debian package
• Platform: debian/buster

[richvdh]

crate a room with various levels above 100, with owners and members above, too.

How do you do this?

[babolivier]

How do you do this?

Via the initial_state param in the /createRoom request (I've just successfully granted myself PL 500 in a new room that way).

[grinapo]

Related: https://github.com/matrix-org/matrix-doc/issues/2149

@babolivier I have used power_level_content_override but it's the same.

[babolivier]

Ah, yeah, I forgot that was a thing. Anyway, yes, the max PL is overridable at room creation time.

[richvdh]

I'm not convinced this is worthy of a 'security' label

[anoadragon453]

Should be fixed by #6237