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=1794590901; b=NTFjptJdqYiXCHWv0VBMOdvjQgwvGx7CqIxsflXqvOfMj4VPqywgrFV1M3PZGzu4bFsl agjZnD70zsiyvAxuwp5wa1cUBF4eUL7NUlmLMMGJTgynSv1+0dgHEZwL1IttFjH9l9e2q 49NeZdfNSmP4g+Ggz/bfaQd6+Ar8jcyogZzGwfg5VTgZTjIkfIj6IQ2uaJ7MUWSgH0/zP Uihri0bC204QZVjvIfNnpoJKYJD5wNnck9OfZB6/e0krT9nXEQokV/3pKOVYpMZ4mxQnc qwzB4RRLs56eUosNXKLqvBUnRI535LKRCWnZWgdnSeOMD+DKfQAfKkRp8+zMaEm9Yig== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794590901; 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=uvid/rODD+IK8kjWYq1t0keY8n3fX/itOqOb9uaKWi4=; b=JvINUWWOGKbXNd19SfiGUfK9woCmmIJFWpdTjgOOpD0LEfbX3QD7gCHB8dyCcNe7OC0H QwycI7wYzgkqGp1rZ+PcQ4/kxjyYjsNT7RIYxRNU/1HSz4WrPyLhJW5wMblMIj570FNif fCXWBYcbedofm5VvMqgxAd1kpvTZwxi5aiFSqCAUpc4y1JNLGb0ox9lB1XRCasgWUxnaY dfLcUPGYwfMdktvU8XrSj3crOEsTB2O61rEuDcgGk7BPrCIFl1essm0bigpAVJrNVCAZ0 66RsXUCAReHwx3+bf+KhedW3+JOKJFII33GnNuDOKBOQpcx5ykqkP7fz11se2lSu28g== 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=DEU9DaQ7; 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 38E45607EE75; Fri, 13 Nov 2026 17:28:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=DEU9DaQ7 Received: by smtp.kernel.org (Postfix) with ESMTPSA id D91941F000C4; Fri, 13 Nov 2026 17:28:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794590901; bh=uvid/rODD+IK8kjWYq1t0keY8n3fX/itOqOb9uaKWi4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=DEU9DaQ7tBeqoV3/NQsTmIDJK4Y6V5CKwaH1dVhOrEFjF9avUic62YtguNBUDVeUX 6ADFJ0TIngGPZV7jnvL3LBTvPuvVFyPbHvFdLSkCv2SbId33E/TvCner7MZv0R4cLE VowBg8nGAwVQEF1piEK5DvrM+fHec9Y9a1AyPQdc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Christian Borntraeger , Heiko Carstens , Sasha Levin Subject: [PATCH 6.12 091/670] s390/vmcp: Initialize full session info to zero Date: Fri, 13 Nov 2026 10:44:15 -0500 Message-ID: <20261113153814.992852072@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261113153811.177190860@linuxfoundation.org> References: <20261113153811.177190860@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christian Borntraeger [ Upstream commit f63eb4ee4a30fc5d8de07a229d92310e3c8d560c ] 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 [borntraeger@linux.ibm.com: use kzalloc instead of kzalloc_obj for older versions] Signed-off-by: Christian Borntraeger Signed-off-by: Sasha Levin --- drivers/s390/char/vmcp.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c index c6d58335beb47..4fdc3f1dc8db3 100644 --- a/drivers/s390/char/vmcp.c +++ b/drivers/s390/char/vmcp.c @@ -105,13 +105,11 @@ static int vmcp_open(struct inode *inode, struct file *file) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - session = kmalloc(sizeof(*session), GFP_KERNEL); + session = kzalloc(sizeof(*session), GFP_KERNEL); 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); -- 2.53.0