From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 57F46441638; Thu, 30 Jul 2026 15:24:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785425067; cv=none; b=kaxst9b8Fob9sPN2dTiicf/Vim29UFpB6tkGDX5hl3LVQRNVAppV0azK8F3usV0mRvOlqLqRMWYQjJajL5SZwGGMhhJUY86YezUDXGMps2okWisT7675Cm22mJQRwZIeNRrJvF6/7AQrzObwiyi2YwQdshcEm/SASbIpEoBFMXo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785425067; c=relaxed/simple; bh=9G5lmVQBEWwJewDc0yi0zS4JXgbdvE1YrxgaY8RS82U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=XzL1sw7FfvoUaEpw4vrv8XzZB2A55MqCP2WFAJsohqy8+7yufXY6agFVFOyKzM3vNDsbYws8oZ7JLMcLyq7YStjT9mTYvmRrUxBb1O2Fk4cmGTYfoQgFQAGOHKUdgpJDPLwXh670RCuuMQxNoFW+TW5FzBMXCnyNmPEOTxKH9ms= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=IZiXjCxk; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="IZiXjCxk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9C40D1F000E9; Thu, 30 Jul 2026 15:24:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1785425066; bh=yh8UU+1BnOj3kaRPB3fz7Rwuaz616eXhveZOQLeuHL4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=IZiXjCxkv6YHANH3W55nkLwLB4RzgljMw9JlU5mJ7C6tR23X1PJs9zg/aoYazU20q detknrX/t9XjCptwoZC3HyLcJnuB589V3jo+vr65pMK8+i1K0XIp8pJeUxMZDsfghO osEH2s/KdYw1mf2RxrlFu5/2KVyCNeS3D4vDNJt8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jason Wang , Xie Yongji , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , "Michael S. Tsirkin" , Sasha Levin Subject: [PATCH 6.18 615/675] VDUSE: avoid leaking information to userspace Date: Thu, 30 Jul 2026 16:15:45 +0200 Message-ID: <20260730141458.187905492@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260730141445.110192266@linuxfoundation.org> References: <20260730141445.110192266@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Wang [ Upstream commit 9c1523803445ee0348f62b77793266dd981596e0 ] The bounceing is not necessarily page aligned, so current VDUSE can leak kernel information through mapping bounce pages to userspace. Allocate bounce pages with __GFP_ZERO to avoid leaking information to userspace. Fixes: 8c773d53fb7b ("vduse: Implement an MMU-based software IOTLB") Cc: stable@vger.kernel.org Signed-off-by: Jason Wang Reviewed-by: Xie Yongji Reviewed-by: Eugenio Pérez Signed-off-by: Michael S. Tsirkin Message-ID: <20260130050750.4050-1-jasowang@redhat.com> Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/vdpa/vdpa_user/iova_domain.c | 2 +- drivers/vdpa/vdpa_user/vduse_dev.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) --- a/drivers/vdpa/vdpa_user/iova_domain.c +++ b/drivers/vdpa/vdpa_user/iova_domain.c @@ -124,7 +124,7 @@ static int vduse_domain_map_bounce_page( if (!map->bounce_page) { head_map = &domain->bounce_maps[(iova & PAGE_MASK) >> BOUNCE_MAP_SHIFT]; if (!head_map->bounce_page) { - tmp_page = alloc_page(GFP_ATOMIC); + tmp_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); if (!tmp_page) return -ENOMEM; if (cmpxchg(&head_map->bounce_page, NULL, tmp_page)) --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -930,7 +930,7 @@ static void *vduse_dev_alloc_coherent(un if (!token.group) return NULL; - addr = alloc_pages_exact(size, flag); + addr = alloc_pages_exact(size, flag | __GFP_ZERO); if (!addr) return NULL;