From patchwork Wed Feb 19 16:40:28 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Brauner X-Patchwork-Id: 13982525 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 BC73F1FECC9 for ; Wed, 19 Feb 2025 16:40:35 +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=1739983235; cv=none; b=Iuehbp8B6Jut4zvOsPYHLz6B2zWbg2zhKpWTdUkKXdgxSEAuYApV5IMQGchEedMRZks/kiAcDl7w5I4MLLNn3vmV90rxmOGU5iAstkXumYEXmtNS4rX2KA0iU3F4JX4SEgsn3uEcYVRiVXGjgdTqrLUywCs10YPNSISbdurvf2c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739983235; c=relaxed/simple; bh=pfUzip/9ZUqIio8NrY0Vu7ZdeL0+rEWGOMkV9a1ck6U=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=OgCRbwp3P+wKmrJ9/3lzVVEpdyXrWwjCGxgj7P5dd4xvQYlT+7/mgDE1onR13xsDhlPXv35lr2wxbjZ10kgPhFJ88bBXOZFFTho0X4ZkEtCMqa+6uubCuu99gIDJHTHW59QR2OndiRiFwoQPd6pCJLkYEwzMszuDKoMRPuRQ0ks= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RIPmJNhV; 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="RIPmJNhV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 326FAC4CEDD; Wed, 19 Feb 2025 16:40:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1739983235; bh=pfUzip/9ZUqIio8NrY0Vu7ZdeL0+rEWGOMkV9a1ck6U=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=RIPmJNhVFC0hkIY8bfgFzlQeq1ZGCBFWvvqFxS4PbUHUNwQwCHzPB723mHnB+HL9o VdBqIBVCiRtCPkGqq/5wnrgiGyvfEK2LVRSq1Hfh5WOItuzYtI5CA4mK0+I2sQdET6 MToWOWl97h2Dfpjt0R2cthRnOUjKTXvLzwWfZ4gdg/G2QoMeFQScI1TFzj2THu8Jo4 KSi3UBIFwF5LrkWhqVJYAJtIzle0dplMj+CeTvESoOkghqz9l7hSh+o2E2kUNxxKkw unpispb4CcLJeMhAi+Q5TQ4Box9nmUoZi790byifBKXUX9knrYcslR6xZuoKZHJ+SF ealrx4m/Vb9tA== From: Christian Brauner Date: Wed, 19 Feb 2025 17:40:28 +0100 Subject: [PATCH 1/2] nsfs: validate ioctls Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250219-work-nsfs-v1-1-21128d73c5e8@kernel.org> References: <20250219-work-nsfs-v1-0-21128d73c5e8@kernel.org> In-Reply-To: <20250219-work-nsfs-v1-0-21128d73c5e8@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: Jeff Layton , Jann Horn , Josef Bacik , Christian Brauner X-Mailer: b4 0.15-dev-d23a9 X-Developer-Signature: v=1; a=openpgp-sha256; l=1697; i=brauner@kernel.org; h=from:subject:message-id; bh=pfUzip/9ZUqIio8NrY0Vu7ZdeL0+rEWGOMkV9a1ck6U=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMaRv42yYF3ZisY5mWMzGlW19VnH/uOojCpJ3xOmG1Dps8 2pvrpDsKGVhEONikBVTZHFoNwmXW85TsdkoUwNmDisTyBAGLk4BmEjhIob/vn+2Tohp3THRZJO6 qYay0a1Z26w644p609O5b+jcr412Zvinz7jcPLfs78mHupl6Hz8Gu83wLT40/Rh3ZMoR3TXTc3g 4AA== X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Nsfs supports extensible and non-extensible ioctls. Validate both types to prevent confusion. Signed-off-by: Christian Brauner --- fs/nsfs.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/fs/nsfs.c b/fs/nsfs.c index 663f8656158d..1ab705bb9386 100644 --- a/fs/nsfs.c +++ b/fs/nsfs.c @@ -152,19 +152,49 @@ static int copy_ns_info_to_user(const struct mnt_namespace *mnt_ns, return 0; } +static bool nsfs_ioctl_valid(unsigned int cmd) +{ + switch (cmd) { + case NS_GET_USERNS: + case NS_GET_PARENT: + case NS_GET_NSTYPE: + case NS_GET_OWNER_UID: + case NS_GET_MNTNS_ID: + case NS_GET_PID_FROM_PIDNS: + case NS_GET_TGID_FROM_PIDNS: + case NS_GET_PID_IN_PIDNS: + case NS_GET_TGID_IN_PIDNS: + return (_IOC_TYPE(cmd) == _IOC_TYPE(cmd)); + } + + /* Extensible ioctls require some extra handling. */ + switch (_IOC_NR(cmd)) { + case _IOC_NR(NS_MNT_GET_INFO): + case _IOC_NR(NS_MNT_GET_NEXT): + case _IOC_NR(NS_MNT_GET_PREV): + return (_IOC_TYPE(cmd) == _IOC_TYPE(cmd)); + } + + return false; +} + static long ns_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { struct user_namespace *user_ns; struct pid_namespace *pid_ns; struct task_struct *tsk; - struct ns_common *ns = get_proc_ns(file_inode(filp)); + struct ns_common *ns; struct mnt_namespace *mnt_ns; bool previous = false; uid_t __user *argp; uid_t uid; int ret; + if (!nsfs_ioctl_valid(ioctl)) + return -ENOIOCTLCMD; + + ns = get_proc_ns(file_inode(filp)); switch (ioctl) { case NS_GET_USERNS: return open_related_ns(ns, ns_get_owner);