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 38BBE2F745C; Wed, 28 Jan 2026 15:47:59 +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=1769615279; cv=none; b=N+J3LN7i9d7IT4KZoMovDAdHI7MgaiUrcQM/YD3bGC9JknjQ+g8Rl90hH3skctM0LP/PJQxU4nYBJMT6eFTapWKqxg52VeaXh6MfHV6x0uW4PS1b5KqCRePwtEffveBkFQVwIkJ12clN/EMK8lxvjKLNFI5Kkv6TbG3thDLjoU0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769615279; c=relaxed/simple; bh=nz2t1RId91i+raWi4cdJ8CMmms5xM9IN2VU9XTHqjdk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RYEmk6IhEgqBrvU1BqWfrlCvkfzV37UlmHYg5YG+SfddOR2DWGCZNhHohAIrCVJuRurVgxWmSuJP0qeXZTi4L6GV6d7YVScKaiuwgEgtyrssnh2DJCdoHKf28HuRqYMQQlEp+IAmjkm+Q4ANTkHnVyli+NOkHsSLg+rMakoenGQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=jbdeeHJk; 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="jbdeeHJk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9355FC4CEF1; Wed, 28 Jan 2026 15:47:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1769615279; bh=nz2t1RId91i+raWi4cdJ8CMmms5xM9IN2VU9XTHqjdk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jbdeeHJkHDyXOdRUpE8fDsSMg12ePcDTWHa7Ylx4I2pACsYLOfHHkQ7JPsSaf2cvT yXMUnnplQKoRExGdcpySzJEyUm9bcAnL8gWAqWVH2ZCsxXENDZQVAYRIo4IiM6z6+w L0mN/8tlba1a2qyu0BCEi6f+umSMeowN/+t0KNgA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yang Shen , Chenghai Huang , Zhangfei Gao Subject: [PATCH 6.12 132/169] uacce: implement mremap in uacce_vm_ops to return -EPERM Date: Wed, 28 Jan 2026 16:23:35 +0100 Message-ID: <20260128145338.758575394@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260128145334.006287341@linuxfoundation.org> References: <20260128145334.006287341@linuxfoundation.org> User-Agent: quilt/0.69 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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yang Shen commit 02695347be532b628f22488300d40c4eba48b9b7 upstream. The current uacce_vm_ops does not support the mremap operation of vm_operations_struct. Implement .mremap to return -EPERM to remind users. The reason we need to explicitly disable mremap is that when the driver does not implement .mremap, it uses the default mremap method. This could lead to a risk scenario: An application might first mmap address p1, then mremap to p2, followed by munmap(p1), and finally munmap(p2). Since the default mremap copies the original vma's vm_private_data (i.e., q) to the new vma, both munmap operations would trigger vma_close, causing q->qfr to be freed twice(qfr will be set to null here, so repeated release is ok). Fixes: 015d239ac014 ("uacce: add uacce driver") Cc: stable@vger.kernel.org Signed-off-by: Yang Shen Signed-off-by: Chenghai Huang Acked-by: Zhangfei Gao Link: https://patch.msgid.link/20251202061256.4158641-4-huangchenghai2@huawei.com Signed-off-by: Greg Kroah-Hartman --- drivers/misc/uacce/uacce.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/misc/uacce/uacce.c +++ b/drivers/misc/uacce/uacce.c @@ -214,8 +214,14 @@ static void uacce_vma_close(struct vm_ar } } +static int uacce_vma_mremap(struct vm_area_struct *area) +{ + return -EPERM; +} + static const struct vm_operations_struct uacce_vm_ops = { .close = uacce_vma_close, + .mremap = uacce_vma_mremap, }; static int uacce_fops_mmap(struct file *filep, struct vm_area_struct *vma)