linux-kernel - Re: do_change_type(): refuse to operate on unmounted/not ours mounts

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Message-ID: <CAE1zp77udiu5bB7+4G7ca=A+dsm_veZoPBM6ZceEnHAUBtgK3g@mail.gmail.com>
Date: Thu, 14 Aug 2025 15:07:58 +0800
From: Pavel Tikhomirov <snorcht@...il.com>
To: Al Viro <viro@...iv.linux.org.uk>
Cc: Tycho Andersen <tycho@...ho.pizza>, Andrei Vagin <avagin@...gle.com>, 
	Andrei Vagin <avagin@...il.com>, Christian Brauner <brauner@...nel.org>, 
	linux-fsdevel <linux-fsdevel@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, 
	criu@...ts.linux.dev, Linux API <linux-api@...r.kernel.org>, 
	stable <stable@...r.kernel.org>
Subject: Re: do_change_type(): refuse to operate on unmounted/not ours mounts

> It should be enough to run a zdtm test-suit to check that change does
> not break something for CRIU (will do).

jfyi: checked 0cc53520e68 with patch "[PATCH] use uniform permission
checks for all mount propagation changes" (+ s/from/to/), there is no
problem on criu-zdtm mount related tests. I see some problems on
socket related tests on it, but it looks unrelated.