netdev - [PATCH RFC DRAFT 05/50] nsfs: raise SB_I_NODEV and SB_I

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Message-Id: <20251021-work-namespace-nstree-listns-v1-5-ad44261a8a5b@kernel.org>
Date: Tue, 21 Oct 2025 13:43:11 +0200
From: Christian Brauner <brauner@...nel.org>
To: linux-fsdevel@...r.kernel.org, Josef Bacik <josef@...icpanda.com>, 
 Jeff Layton <jlayton@...nel.org>
Cc: Jann Horn <jannh@...gle.com>, Mike Yuan <me@...dnzj.com>, 
 Zbigniew Jędrzejewski-Szmek <zbyszek@...waw.pl>, 
 Lennart Poettering <mzxreary@...inter.de>, 
 Daan De Meyer <daan.j.demeyer@...il.com>, Aleksa Sarai <cyphar@...har.com>, 
 Amir Goldstein <amir73il@...il.com>, Tejun Heo <tj@...nel.org>, 
 Johannes Weiner <hannes@...xchg.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>, 
 linux-kernel@...r.kernel.org, cgroups@...r.kernel.org, bpf@...r.kernel.org, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 netdev@...r.kernel.org, Arnd Bergmann <arnd@...db.de>, 
 Christian Brauner <brauner@...nel.org>
Subject: [PATCH RFC DRAFT 05/50] nsfs: raise SB_I_NODEV and SB_I_NOEXEC

There's zero need for nsfs to allow device nodes or execution.

Signed-off-by: Christian Brauner <brauner@...nel.org>
---
 fs/nsfs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/nsfs.c b/fs/nsfs.c
index 0e3fe8fda5bf..363be226e357 100644
--- a/fs/nsfs.c
+++ b/fs/nsfs.c
@@ -589,6 +589,8 @@ static int nsfs_init_fs_context(struct fs_context *fc)
 	struct pseudo_fs_context *ctx = init_pseudo(fc, NSFS_MAGIC);
 	if (!ctx)
 		return -ENOMEM;
+	fc->s_iflags |= SB_I_NOEXEC;
+	fc->s_iflags |= SB_I_NODEV;
 	ctx->s_d_flags |= DCACHE_DONTCACHE;
 	ctx->ops = &nsfs_ops;
 	ctx->eops = &nsfs_export_operations;

-- 
2.47.3