linux-kernel - [PATCH v7 5/5] docs: proc: add documentation about relaxing visibility restrictions

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Message-ID: <b20343931abd5d458b7f3de59cc35b9d52e8191a.1768295900.git.legion@kernel.org>
Date: Tue, 13 Jan 2026 10:20:37 +0100
From: Alexey Gladkov <legion@...nel.org>
To: Christian Brauner <brauner@...nel.org>,
	Dan Klishch <danilklishch@...il.com>
Cc: Al Viro <viro@...iv.linux.org.uk>,
	"Eric W . Biederman" <ebiederm@...ssion.com>,
	Kees Cook <keescook@...omium.org>,
	containers@...ts.linux-foundation.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v7 5/5] docs: proc: add documentation about relaxing visibility restrictions

Signed-off-by: Alexey Gladkov <legion@...nel.org>
---
 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 instances of
 procfs available to the mounter and will not allow procfs to be mounted if:
 
-  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=pid option.
 
      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 mount.
-- 
2.52.0