linux-kernel - [PATCH v6 1/2] statmount: permission check should return EPERM

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Message-ID: <20251118084836.2114503-2-b.sachdev1904@gmail.com>
Date: Tue, 18 Nov 2025 14:16:41 +0530
From: Bhavik Sachdev <b.sachdev1904@...il.com>
To: Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	criu@...ts.linux.dev,
	Aleksa Sarai <cyphar@...har.com>,
	Bhavik Sachdev <b.sachdev1904@...il.com>,
	Pavel Tikhomirov <ptikhomirov@...tuozzo.com>,
	Jan Kara <jack@...e.cz>,
	John Garry <john.g.garry@...cle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"Darrick J . Wong" <djwong@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrei Vagin <avagin@...il.com>,
	Alexander Mikhalitsyn <alexander@...alicyn.com>,
	Miklos Szeredi <miklos@...redi.hu>
Subject: [PATCH v6 1/2] statmount: permission check should return EPERM

Currently, statmount() returns ENOENT when caller is not CAP_SYS_ADMIN
in the current user namespace. This should be EPERM instead.

Suggested-by: Miklos Szeredi <miklos@...redi.hu>
Signed-off-by: Bhavik Sachdev <b.sachdev1904@...il.com>
---
 fs/namespace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index 2bad25709b2c..ee36d67f1ac2 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -5795,7 +5795,7 @@ SYSCALL_DEFINE4(statmount, const struct mnt_id_req __user *, req,
 
 	if (kreq.mnt_ns_id && (ns != current->nsproxy->mnt_ns) &&
 	    !ns_capable_noaudit(ns->user_ns, CAP_SYS_ADMIN))
-		return -ENOENT;
+		return -EPERM;
 
 	ks = kmalloc(sizeof(*ks), GFP_KERNEL_ACCOUNT);
 	if (!ks)
-- 
2.51.1