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 50F0964CC0; Thu, 11 Apr 2024 10:51:31 +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=1712832691; cv=none; b=KMJtdN/+ZuKe0LZdKcpKNOPWX//NZguxDWBiB0qqVPVe8HAy4JYyS1px1/f6AMcrcPhfjbx+2pqGIOQ5wjJ56E6p9wEfqbic+9eAllWd8/kThpfKZ/6EstdCgHA1ocUMulRjpVbleRbJEWELbQRyfLyucVOYL4Yf2QUHAu3r9hc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712832691; c=relaxed/simple; bh=pMrOuebTnzHoRaCrFFn8gb9z0B0j0pTFPq0tf/ceeBc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Vp/53nIYuHOxaYwG1V3/yt4a8SOlRozMk1+rbao9Dm4sJkeAcnWAkPHFgvorZkoCZHjxy1GIMq1AJ+ULDyERdXevuOIMhnp2k5qeA0Jk3Z4aMMHWl7PItFv7ozeX6fYXlWUE3F05HqvWVGy3MmKUtI2O2liPGONuAiw0697RoQM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=slCfF25L; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="slCfF25L" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CC5B6C433C7; Thu, 11 Apr 2024 10:51:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1712832691; bh=pMrOuebTnzHoRaCrFFn8gb9z0B0j0pTFPq0tf/ceeBc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=slCfF25LMaiI+a9ZEW3yncsehr3R+NM7fRDDJJHrGIzBfV8t6uyvFHWkh/DneEMuG V6JRjjAKwTO0Z5ngIkcgZ0nq2qAYUVpsmG2qhKJv9+nK/+z8a2x+pSVaG/aDAllkN7 qgBgvd5dE4fdXZ1DG5Cwnv/PwXO+0F80EOcGmq+o= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Thadeu Lima de Souza Cascardo Subject: [PATCH 5.15 49/57] tty: n_gsm: require CAP_NET_ADMIN to attach N_GSM0710 ldisc Date: Thu, 11 Apr 2024 11:57:57 +0200 Message-ID: <20240411095409.472720084@linuxfoundation.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240411095407.982258070@linuxfoundation.org> References: <20240411095407.982258070@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Thadeu Lima de Souza Cascardo commit 67c37756898a5a6b2941a13ae7260c89b54e0d88 upstream. Any unprivileged user can attach N_GSM0710 ldisc, but it requires CAP_NET_ADMIN to create a GSM network anyway. Require initial namespace CAP_NET_ADMIN to do that. Signed-off-by: Thadeu Lima de Souza Cascardo Link: https://lore.kernel.org/r/20230731185942.279611-1-cascardo@canonical.com From: Salvatore Bonaccorso Signed-off-by: Greg Kroah-Hartman --- drivers/tty/n_gsm.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -2827,6 +2827,9 @@ static int gsmld_open(struct tty_struct { struct gsm_mux *gsm; + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + if (tty->ops->write == NULL) return -EINVAL;