From nobody Sun Feb 8 08:47:58 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 12E84389E01; Tue, 13 Jan 2026 09:21:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768296086; cv=none; b=dlm4w1/7hX77Bc5oF3Zh8j6ODcYTf02POU7NoTtGQYoaXQmzeUXU5sh3V/+09DbJhtQQNjDvTHj4ZBDKQ/ymfzYb0nMeK54GKN6gE64rft+LNR900Dz6AfXwoEd2tW+fgZNu8RGTWFumzKhGNIWLMp18JM6271BFpx8KL8FDwWY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768296086; c=relaxed/simple; bh=ROVKdQmr+DawgPpCxGcE1IpjtvRSKTzHsnNOpgWpY9E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oIHxEa9vPz8Ut6J10nRh/vBdMzWjZzTr94p9mCPnBW+5gGE1MvihdwqG+UhEk6DgBlAlWc230+xC3YfNluU2hsjrytAKyoU320uawx+1GBTofncIHYTx/jOZ8gbWmaZQi9kz/JDkI3BDe4HE91goP5grD1BV7tw2xCESpDY52FI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XKeGm3Z3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XKeGm3Z3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A39F7C19422; Tue, 13 Jan 2026 09:21:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768296082; bh=ROVKdQmr+DawgPpCxGcE1IpjtvRSKTzHsnNOpgWpY9E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XKeGm3Z37swapz8yNgLzUItd/+DekYmVc63BE1ZBTbzbWTbnVUm2+nank76dYy72d 9XjcP5DCtOdb8LTREGlnqsQHy43V73VlZOQgD46419Su7zAXcs3w4mGdmVERkmh/Fk AALmm4tTutZESfelEfh1dfiaQycBPZZDO49oOBCzaC2QvFvStEJgx7nLFjPNgzUN2O pmz0AgmR2pYLY2KtulJZmqOQH8UVl6sbOn/AnjcsNwQp0rYZ5ijlHXy1fPsr4IQQuB NbSfHt990gCQI0Q5PxDz/8hF/YTMHjomYx48zuI3XCwUrhEeX3FeIp6xWhS+KGdbOs 0v2I8CiG+l4DQ== From: Alexey Gladkov To: Christian Brauner , Dan Klishch Cc: Al Viro , "Eric W . Biederman" , Kees Cook , containers@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v7 5/5] docs: proc: add documentation about relaxing visibility restrictions Date: Tue, 13 Jan 2026 10:20:37 +0100 Message-ID: X-Mailer: git-send-email 2.52.0 In-Reply-To: References: <20251213050639.735940-1-danilklishch@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Signed-off-by: Alexey Gladkov --- Documentation/filesystems/proc.rst | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems= /proc.rst index c8864fcbdec7..3acf178c1202 100644 --- a/Documentation/filesystems/proc.rst +++ b/Documentation/filesystems/proc.rst @@ -2417,7 +2417,8 @@ so will give an `-EBUSY` error). If user namespaces are in use, the kernel additionally checks the instance= s of procfs available to the mounter and will not allow procfs to be mounted if: =20 - 1. This mount is not fully visible. + 1. This mount is not fully visible unless the new procfs is going to be + mounted with subset=3Dpid option. =20 a. It's root directory is not the root directory of the filesystem. b. If any file or non-empty procfs directory is hidden by another mou= nt. --=20 2.52.0