From nobody Wed Nov 27 06:41:06 2024 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 05F841C3F0A; Fri, 11 Oct 2024 20:37:27 +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=1728679048; cv=none; b=KbpdVama0ONF5wVqel0SJSnH0htrIYgzsSEgef2eqyRTsUZ+r7FBAPyozhy8BQLOLe/qh5rRdnTLpCFu2bRW9TJZeEBx0aaHFD6nN3+VPtwz0TtiZfSbQhqKbweoq/MXkR/3oFZzSOL04siUBbTauEzg24nLGEIB+sOGIwn6ITo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728679048; c=relaxed/simple; bh=CWZGBnEJ80UiaDTPSuDUZ70kqMw3cxxu6gG4Z0pcQVE=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=M5iLnQr7yGD6fnSGRXwEpejfQdLXQk+O4UJHXZnOz1DdfdT7j+WRYQJNWdxgDHy/VCnc4P8mXN+rDx6/fZKMTR3F4JJtWORhLkFY3RX3c6Yl71Rdns+194czOOQXIZSKKW5E/lGJyrxJZE9rXv2JMcU8NfeDQYO7T6+ioi5xVSk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=uYAbcrXK; 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="uYAbcrXK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 831CEC4CEC3; Fri, 11 Oct 2024 20:37:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728679047; bh=CWZGBnEJ80UiaDTPSuDUZ70kqMw3cxxu6gG4Z0pcQVE=; h=From:To:Cc:Subject:Date:From; b=uYAbcrXK8FLRoEkmirqKqE2T2BWanywm0TM90kzfEKK0nYuDxOhrIhDbmui+SrNt+ 1mjjpUvymCswoPAWZddBRZSI7fZe1o/evRZNqBo4Dx0xEuYkhxpBEJfDTd3GNxZ7x6 EfQdm7CxvjmXuQiP/TXiDi+s7rhBX8ol2CN0MOjYzQ641N3+0xB/AMBZfdDW9fuMFx P22KWy+9B9G/KGvAJ+MhJiAwddKNcyTSZWStAhfBiaqRPqSU4L7Qo+fr2ai89iLO7+ Hpf0G4myWZ4l50hTbL1Ymw49gXx1n5eI2ZVFY1+67nxeDf2gyZfuLV8Q+x3Tkzavr1 H7vOx5CHPuwdg== From: Song Liu To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org Cc: viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, kernel-team@fb.com, song@kernel.org Subject: [PATCH] fsnotify, lsm: Separate fsnotify_open_perm() and security_file_open() Date: Fri, 11 Oct 2024 13:37:22 -0700 Message-ID: <20241011203722.3749850-1-song@kernel.org> X-Mailer: git-send-email 2.43.5 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Currently, fsnotify_open_perm() is called from security_file_open(). This is not right for CONFIG_SECURITY=3Dn and CONFIG_FSNOTIFY=3Dy case, as security_file_open() in this combination will be a no-op and not call fsnotify_open_perm(). Fix this by calling fsnotify_open_perm() directly. Signed-off-by: Song Liu Acked-by: Paul Moore --- PS: I didn't included a Fixes tag. This issue was probably introduced 15 years ago in [1]. If we want to back port this to stable, we will need another version for older kernel because of [2]. [1] c4ec54b40d33 ("fsnotify: new fsnotify hooks and events types for access= decisions") [2] 36e28c42187c ("fsnotify: split fsnotify_perm() into two hooks") --- fs/open.c | 4 ++++ security/security.c | 9 +-------- 2 files changed, 5 insertions(+), 8 deletions(-) diff --git a/fs/open.c b/fs/open.c index acaeb3e25c88..6c4950f19cfb 100644 --- a/fs/open.c +++ b/fs/open.c @@ -946,6 +946,10 @@ static int do_dentry_open(struct file *f, if (error) goto cleanup_all; =20 + error =3D fsnotify_open_perm(f); + if (error) + goto cleanup_all; + error =3D break_lease(file_inode(f), f->f_flags); if (error) goto cleanup_all; diff --git a/security/security.c b/security/security.c index 6875eb4a59fc..a72cc62c0a07 100644 --- a/security/security.c +++ b/security/security.c @@ -19,7 +19,6 @@ #include #include #include -#include #include #include #include @@ -3102,13 +3101,7 @@ int security_file_receive(struct file *file) */ int security_file_open(struct file *file) { - int ret; - - ret =3D call_int_hook(file_open, file); - if (ret) - return ret; - - return fsnotify_open_perm(file); + return call_int_hook(file_open, file); } =20 /** --=20 2.43.5