From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97135C433E4 for ; Mon, 27 Jul 2020 07:56:45 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5253F20738 for ; Mon, 27 Jul 2020 07:56:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="MG5CBLty" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5253F20738 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linux-kernel-mentees-bounces@lists.linuxfoundation.org Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 2BFA1203D2; Mon, 27 Jul 2020 07:56:45 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gbSntcp48mWP; Mon, 27 Jul 2020 07:56:44 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by silver.osuosl.org (Postfix) with ESMTP id A5FCB2002B; Mon, 27 Jul 2020 07:56:44 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 911C6C004F; Mon, 27 Jul 2020 07:56:44 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id BDD99C004D for ; Mon, 27 Jul 2020 07:56:42 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 97C40203D2 for ; Mon, 27 Jul 2020 07:56:42 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LxhBa9dkDDHA for ; Mon, 27 Jul 2020 07:56:41 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mail-qk1-f194.google.com (mail-qk1-f194.google.com [209.85.222.194]) by silver.osuosl.org (Postfix) with ESMTPS id 2744F2002B for ; Mon, 27 Jul 2020 07:56:41 +0000 (UTC) Received: by mail-qk1-f194.google.com with SMTP id b79so14432931qkg.9 for ; Mon, 27 Jul 2020 00:56:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=N6upqxCfyW0GVZHe453idrIKQhFzkY5bo/oAq5M3uGE=; b=MG5CBLtyWpDp74hy9XAMKqGEpWa8mR8mZm6FLz3EmFUhHuNS6Cc+ucxF/8J3Kwilww ctoLd7ZrsXx6WGMNMV4rJbnd27tJ1/e4rtMyJBuCTqpVNAAoNo99DbKA44lj0OjjfjF3 SNqKyxqlob+pKDiCPnI21KXkXmZNE53JjrZ3oENbp1qhQTFUoABDRLmgacaHzT4HdKI4 tBXnGOlWKicNc5GHjatI5XupCQPIIbGS5yKAF0NRmIBtDgzck+d0RDxmQyQh1BrnGohf L7vVZJdawFwAO9/0fnkuLd6z7+8TZ0QuPIM0GgkOvt+scBTGTnMDfHPP4eA37TtOMW0V Z1LA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=N6upqxCfyW0GVZHe453idrIKQhFzkY5bo/oAq5M3uGE=; b=jzRNkptYaY2YNNQSoPVuHRx3fG8tzmKLeDDmC00giMovaeaRRLLPFMDt+KO8tdxylG K8MZYn0UuXZcDh/9nxw04sMPM19W3c5nrnWA+5dCgGB9Q1i/jK7ST7TkVARMS7XQkJ9D Wc/eAY8k37Cp6RUN8CgXPyWSK1FDBdikZHxGEzf6dHUgy1ZKs6UwZH8yCXr5eZsutLVh mKvYgNV+XDHN2Bs+msb0ebfB6fG0EHpGYlhRVqSfHYj0dxfyAch/NBFARTTlm037IjvQ qoyees/aeM6WCky6fo1+eP7y5lIaQAEcTJTkqgAfP+jN7imhOQK8b00wfuBTpRAyjUeO ZlLA== X-Gm-Message-State: AOAM533PvhABkzeVtbiuiPWcut/k4nAQy0/jIZRp457sHlMKgu/ryg+Q U6/c9R68/L1tQb9SxbVaHg== X-Google-Smtp-Source: ABdhPJxAQQcavuqSCw162hVKCvTa60uFZJYYJ8f5F0oIw3F8nSrx6KfVDkWkp/ov+7P3mP9y4r3j/A== X-Received: by 2002:a37:61ce:: with SMTP id v197mr2776425qkb.44.1595836600043; Mon, 27 Jul 2020 00:56:40 -0700 (PDT) Received: from PWN ([209.94.141.207]) by smtp.gmail.com with ESMTPSA id p4sm17340859qkj.135.2020.07.27.00.56.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Jul 2020 00:56:39 -0700 (PDT) Date: Mon, 27 Jul 2020 03:56:37 -0400 From: Peilin Ye To: Arnd Bergmann Message-ID: <20200727075637.GA205716@PWN> References: <20200726220557.102300-1-yepeilin.cs@gmail.com> <20200726222703.102701-1-yepeilin.cs@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Cc: Niklas =?iso-8859-1?Q?S=F6derlund?= , syzkaller-bugs , Linux Media Mailing List , "linux-kernel@vger.kernel.org" , Laurent Pinchart , Sakari Ailus , Vandana BN , Hans Verkuil , Mauro Carvalho Chehab , Ezequiel Garcia , linux-kernel-mentees@lists.linuxfoundation.org Subject: Re: [Linux-kernel-mentees] [PATCH v3] media/v4l2-core: Fix kernel-infoleak in video_put_user() X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" On Mon, Jul 27, 2020 at 09:25:16AM +0200, Arnd Bergmann wrote: > On Mon, Jul 27, 2020 at 12:28 AM Peilin Ye wrote: > > > > video_put_user() is copying uninitialized stack memory to userspace due > > to the compiler not initializing holes in the structures declared on the > > stack. Fix it by initializing `ev32` and `vb32` using memset(). > > > > Reported-and-tested-by: syzbot+79d751604cb6f29fbf59@syzkaller.appspotmail.com > > Link: https://syzkaller.appspot.com/bug?extid=79d751604cb6f29fbf59 > > Reviewed-by: Laurent Pinchart > > Signed-off-by: Peilin Ye > > Thanks a lot for addressing this! I now see that I actually created a similar > bugfix for it back in January, but for some reason that got stuck in my > backlog and I never wrote a proper description for it or sent it out to the > list, sorry about that. I would hope we could find a way to have either > the compiler or sparse warn if we copy uninitialized data to user space, > but we now don't even check for that within the kernel any more. I am glad to be of help! > I would suggest adding these tags to the patch, to ensure it gets backported > to stable kernels as needed: > > Cc: stable@vger.kernel.org > Fixes: 1a6c0b36dd19 ("media: v4l2-core: fix VIDIOC_DQEVENT for time64 ABI") > Fixes: 577c89b0ce72 ("media: v4l2-core: fix v4l2_buffer handling for > time64 ABI") > > In addition to > > Reviewed-by: Arnd Bergmann Sure, I will send a v4 soon. Thank you for reviewing the patch. Peilin Ye _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees