From nobody Thu Apr 2 22:05:40 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 C4DD43542DB; Fri, 13 Feb 2026 10:44:56 +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=1770979496; cv=none; b=R3ZjG3k8zNkMAv6qyX7bn1YxNSN1v4Gt0CUeB+w3MPfr1hFh2YIYQ7ZyyQCAowtvzegxKZqqg6j9ZwoI42iyelAkWeB4OZiwdyI4of7yRaAOvdP8st2hkhspPsAI72sAoNMkMhoJ27eXrRJPUVxEQICDdBZNpsXNoUyJmakQzWs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770979496; c=relaxed/simple; bh=QRRP7xArIVfTXqzIf8NIlsyrWWBUCIjM0l4EgDMc768=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=N2RBHUG++VJW+ZtYEabaIZuWZfCBrqlS8jQlydBDT0SbRFGtPUzdVuBVqFzVG0q5eg4B/wKjd+/8d6cSy7ZFfhW45zQLyhJaoFJMH64Z9gUV/nWhIFsguBMUI3Czi5TJWOlgWLmNVn89q93jdB/Vz47iqXLK4SMQp9Q6cA2vD+Q= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RJ86mcT1; 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="RJ86mcT1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 07DB3C116C6; Fri, 13 Feb 2026 10:44:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770979496; bh=QRRP7xArIVfTXqzIf8NIlsyrWWBUCIjM0l4EgDMc768=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RJ86mcT1cNuCnObS8WSWu119BBGerKwDRyHm+jdKkCs4Qd+w1X6cIUzPCjx4TCo2g aCbd56Wxmwnc9niy3Fj+sjmHI8oN0FFPBMWlsJMgdqWWmjPnHhQ7QB+a4jBkGvf2ys XpsU6y2vkv3TK9aD7pEhTPrpcOlt9kpIX0ufaYs+R3Se5JeC4EwbtODMsvGovffAiE FyhXxAGCbMFJRnuJ7kGaHBZ7QGB6WFFxL1L5h51b5sObY05yYmamoWe7lLHQ3vhRAd 9WYKVvegydz032f13zCsc77/ynFa5PwQSeXb9Iggdf4/Ic0WI42TUcd0MAaqyuFzl/ 0gK3zd3WnJ0sA== From: Alexey Gladkov To: Christian Brauner , Dan Klishch Cc: Al Viro , "Eric W . Biederman" , Kees Cook , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v8 5/5] docs: proc: add documentation about relaxing visibility restrictions Date: Fri, 13 Feb 2026 11:44:30 +0100 Message-ID: <84b3d2c6f7eadccd115c561d7291ff2f7532595e.1770979341.git.legion@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: References: 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 2.53.0