From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793827102; b=T6S38wRRISTKJRwYHLeuqqzXIWC7DKd/RiGuOC2+9d+WT3gxbOkUnPWvEHUiiMKKMJ6a I2uN94J5BGKbJGcGTGIzoMt2P8QQtF41CSG0k1OtRny4jnmut/Bi9tmwxFW4LAFI+Lu3u 5dJgEGu02vc5wURu1a+q39g5UEZZdoF0MVoMbQ+E2HMnj+9nlkzYW/6FzHlqoY4CG2vAT P0b4WB0olr1FZlBF8tlrZZ/MzIvVwLWh5sPT8Vnk1XtaUhiV+ZYltEzDlbyeoFByJYwSZ Y+ipm5KRHh0yOLZFEKsfSrkgv64aGWx1TAQX9HqpIaYn13GBidNsEnJc75nLRafdGnA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793827102; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=fxBAqDqxqdvRtsZFoiKYQb4acuQytmiJXwjIKrhG4r8=; b=zcDuhg02JN5hz4alqhuvbK77o4T2AKqILxAeO9GSZCV3HBHZ6pwc2rEGx5/kVJ7xgDoV OhWEOBYiAQfIcGIHvfZBaV5jd/yVCwFHsGKukIasFwqg2HxH6WHTg4aSq0SXG+PWri+36 ZdgLBbQo0RNEy+3Yhxsb5piqxkvfsDMbtUmXZSsq6zFJxoFU/0HIDTk3a6YLD+OK2qHUl 1JXC2ixr/PKf+nKs0tgqGlZnvhdlXyly1FWG8pMFW2Lcqimg2xgEi+cct1T2i6zeC4tyR D81mRF0o7/2T5vTINdD3iORzrXMjKbh0kZHSqHul5s5S5qopWfklVJoRys+5Gx+P1aw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=wKWvZwWM; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D1D6606A869; Wed, 4 Nov 2026 21:18:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=wKWvZwWM Received: by smtp.kernel.org (Postfix) with ESMTPSA id 33ADD1F00919; Wed, 4 Nov 2026 21:18:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793827102; bh=fxBAqDqxqdvRtsZFoiKYQb4acuQytmiJXwjIKrhG4r8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=wKWvZwWMiSGa/x7RjN08351unftJOido+2Dx/46VKMKU/4msx9q1gbdFv1RtEt4zf 31DP6lSCN8BJTQKidXM55X4X9V4cKVvWihNPvH4lPJhX/ZEztzplj2Z4HBdaDp9vrU YWPOfPI2fIAb0YRX6u1TRLhYAMQ1/8WJZijZmKf8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Christian Borntraeger , Heiko Carstens Subject: [PATCH 7.3 179/547] s390/vmcp: Initialize full session info to zero Date: Wed, 4 Nov 2026 16:06:03 -0500 Message-ID: <20261104211043.231223106@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261104211038.406938024@linuxfoundation.org> References: <20261104211038.406938024@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christian Borntraeger commit f63eb4ee4a30fc5d8de07a229d92310e3c8d560c upstream. The cma_alloc bit as well as the response can contain old data. cma_release will not free the kmalloced memory in that case and the response code might leak kernel stack data to CAP_SYS_ADMIN users. Cc: stable@vger.kernel.org Signed-off-by: Christian Borntraeger Reviewed-by: Heiko Carstens Signed-off-by: Heiko Carstens Signed-off-by: Greg Kroah-Hartman --- drivers/s390/char/vmcp.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/drivers/s390/char/vmcp.c +++ b/drivers/s390/char/vmcp.c @@ -104,13 +104,11 @@ static int vmcp_open(struct inode *inode if (!capable(CAP_SYS_ADMIN)) return -EPERM; - session = kmalloc_obj(*session); + session = kzalloc_obj(*session); if (!session) return -ENOMEM; session->bufsize = PAGE_SIZE; - session->response = NULL; - session->resp_size = 0; mutex_init(&session->mutex); file->private_data = session; return nonseekable_open(inode, file);