From mboxrd@z Thu Jan 1 00:00:00 1970 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 82F9D32F75B; Tue, 21 Oct 2025 11:44:14 +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=1761047054; cv=none; b=bO5UVffDHZOhKTZcCoaJe0O9Z00IE4ZeWc1pCY9Gh5anFgBFHf6KL+j8VYd0bCXtXGlS8ax5XvJ85BU+x8W+6ytR1XXlR5W6gqj4LN+IBx8CPcJ1/u2PXj5dWpurDKKjFcfL+cgetYbsjSMi5A620CUbdldlb87peByc6zoghlM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761047054; c=relaxed/simple; bh=KoKI9phRTGMhjpn+9D8BgtjcoxSIgpJa0JnjxzKpEbY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=LxlunTkKWj7gejlTREkqKKRgpysHXuCKc9GynqsvkOEnvXOZ1jWf2fT8aWMRLaZw9tOkMQ2B5YUaCq0zWYvdtNCEXG7NKtAhrkxg0zWGS6gXB2TXyuk05e0eFHMpBYrqmedoNB+dDXz3nFsZeVgiuu5wLBZCiv+Ud64/7+elfEg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Own9LxaO; 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="Own9LxaO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC7EDC4CEFD; Tue, 21 Oct 2025 11:44:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761047054; bh=KoKI9phRTGMhjpn+9D8BgtjcoxSIgpJa0JnjxzKpEbY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Own9LxaOxCPJgK+rss6yu3LOvggckkZJUzXvDnCFd9hWH67Vx+raWmWFZtSmgOJ4Y ZGuVtQzUuhFJ4EXY6xvatWIsikY5jOSHPP5NLm93LVfUNm7Iy8iUcUmxnOrsrG4Fzw zMeR98rZjXvd1yJhSGKBbZRFg/Q8GSODOQChwoZCN1BXm7DtgWPHa3Qdfitn63phUl 2wMoQSM4KlTCtEX4QOYaD8Vx2x2xjilPWa0BwZ6K1IPxZf6RTKxKq3/sw8CuR6JC7J NFPG8cjnR8antjb9CxpWYVFwh/bDQ2RF7JoNfsc7axWrfd62pjNiYbHzwOC18/U6eC PTNI5q22z0ppQ== From: Christian Brauner Date: Tue, 21 Oct 2025 13:43:11 +0200 Subject: [PATCH RFC DRAFT 05/50] nsfs: raise SB_I_NODEV and SB_I_NOEXEC Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251021-work-namespace-nstree-listns-v1-5-ad44261a8a5b@kernel.org> References: <20251021-work-namespace-nstree-listns-v1-0-ad44261a8a5b@kernel.org> In-Reply-To: <20251021-work-namespace-nstree-listns-v1-0-ad44261a8a5b@kernel.org> To: linux-fsdevel@vger.kernel.org, Josef Bacik , Jeff Layton Cc: Jann Horn , Mike Yuan , =?utf-8?q?Zbigniew_J=C4=99drzejewski-Szmek?= , Lennart Poettering , Daan De Meyer , Aleksa Sarai , Amir Goldstein , Tejun Heo , Johannes Weiner , Thomas Gleixner , Alexander Viro , Jan Kara , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, bpf@vger.kernel.org, Eric Dumazet , Jakub Kicinski , netdev@vger.kernel.org, Arnd Bergmann , Christian Brauner X-Mailer: b4 0.15-dev-96507 X-Developer-Signature: v=1; a=openpgp-sha256; l=647; i=brauner@kernel.org; h=from:subject:message-id; bh=KoKI9phRTGMhjpn+9D8BgtjcoxSIgpJa0JnjxzKpEbY=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWR8L3xzPUlET+FOWH/IyylvX+3RTf8y6bW6e+rtvsaHH KkxGQ/ZO0pZGMS4GGTFFFkc2k3C5ZbzVGw2ytSAmcPKBDKEgYtTACZioMbw341jYgfDjwwznwqj W87blNhiFp4UXpe/KOaV49ozi9/lNjMyLL43J9hgVYzwB/uIN69f7GJ1VVkXc79m466Sjh3bdHR nMwIA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 There's zero need for nsfs to allow device nodes or execution. Signed-off-by: Christian Brauner --- 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