[{"id":3685431,"web_url":"http://patchwork.ozlabs.org/comment/3685431/","msgid":"<20260503154557.GA1455207@rocinante>","list_archive_url":null,"date":"2026-05-03T18:46:27","subject":"Re: [PATCH] PCI/proc: check __get_user() return value in\n proc_bus_pci_write()","submitter":{"id":77280,"url":"http://patchwork.ozlabs.org/api/people/77280/","name":"Krzysztof Wilczyński","email":"kw@linux.com"},"content":"Hello,\n\n> Check __get_user() and return -EFAULT on failure.\n[...]\n> @@ -136,7 +136,10 @@ static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,\n> \n> \tif ((pos & 1) && cnt) {\n> \t\tunsigned char val;\n> -\t\t__get_user(val, buf);\n> +\t\tif (__get_user(val, buf)) {\n> +\t\t\tret = -EFAULT;\n> +\t\t\tgoto out;\n> +\t\t}\n\nWe could move to get_user() here. This would allow you to drop\nthe access_ok(), too, as get_user() would return -EFAULT on error.\n\nSo, something simple, like:\n\n if (get_user(val, buf))\n \tgoto err;\n\n> +out:\n\nUse \"err\" for a single goto label for the error path.\n\n> \tpci_config_pm_runtime_put(dev);\n> -\n> \t*ppos = pos;\n> -\ti_size_write(ino, dev->cfg_size);\n> -\treturn nbytes;\n> +\tif (ret > 0)\n> +\t\ti_size_write(ino, dev->cfg_size);\n> +\treturn ret;\n\nThis can be kept simple:\n\n err:\n \tpci_config_pm_runtime_put(dev);\n \treturn -EFAULT;\n\nThe i_size_write() is such an unfortunate band-aid, but unless we have a\nway to set the size before the procfs entry is created/made visible, then\nthe problem that this aims to fix is here to stay for now, see:\n\n ecb3908046ce (\"pci: write file size to inode on proc bus file write\")\n\nHaving said all that, since you are looking at proc_bus_pci_write(),\nthen perhaps an update to proc_bus_pci_read() to use put_user() would\nalso be prudent.\n\nThank you!\n\n\tKrzysztof","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-pci+bounces-53644-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=209.85.210.175","smtp.subspace.kernel.org;\n dmarc=fail (p=none dis=none) header.from=linux.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=gmail.com"],"Received":["from sea.lore.kernel.org (sea.lore.kernel.org\n [IPv6:2600:3c0a:e001:db::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g7tzH6yW6z1xvV\n\tfor ; Mon, 04 May 2026 04:46:35 +1000 (AEST)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sea.lore.kernel.org (Postfix) with ESMTP id 163BC300C5BC\n\tfor ; Sun, 3 May 2026 18:46:32 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 7A93639DBFB;\n\tSun, 3 May 2026 18:46:31 +0000 (UTC)","from mail-pf1-f175.google.com (mail-pf1-f175.google.com\n [209.85.210.175])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id 0E33F399374\n\tfor ; Sun, 3 May 2026 18:46:29 +0000 (UTC)","by mail-pf1-f175.google.com with SMTP id\n d2e1a72fcca58-837dfccd950so12004b3a.0\n for ; Sun, 03 May 2026 11:46:29 -0700 (PDT)","from localhost (fpd11144dd.ap.nuro.jp. 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This would allow you to drop\n> the access_ok(), too, as get_user() would return -EFAULT on error.\n>\n> So, something simple, like:\n>\n> if (get_user(val, buf))\n> goto err;\n>\n> > +out:\n>\n> Use \"err\" for a single goto label for the error path.\n>\n> > pci_config_pm_runtime_put(dev);\n> > -\n> > *ppos = pos;\n> > - i_size_write(ino, dev->cfg_size);\n> > - return nbytes;\n> > + if (ret > 0)\n> > + i_size_write(ino, dev->cfg_size);\n> > + return ret;\n>\n> This can be kept simple:\n>\n> err:\n> pci_config_pm_runtime_put(dev);\n> return -EFAULT;\n>\n> The i_size_write() is such an unfortunate band-aid, but unless we have a\n> way to set the size before the procfs entry is created/made visible, then\n> the problem that this aims to fix is here to stay for now, see:\n>\n> ecb3908046ce (\"pci: write file size to inode on proc bus file write\")\n>\n> Having said all that, since you are looking at proc_bus_pci_write(),\n> then perhaps an update to proc_bus_pci_read() to use put_user() would\n> also be prudent.\n>\n> Thank you!\n>\n> Krzysztof\n\nThanks for the detailed feedback. I will send patch v2 shortly.\n\nThanks\n\nDeepanshu Kartikey","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=Py3hqYbY;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c15:e001:75::12fc:5321; helo=sin.lore.kernel.org;\n envelope-from=linux-pci+bounces-53650-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com\n header.b=\"Py3hqYbY\"","smtp.subspace.kernel.org;\n arc=pass smtp.client-ip=209.85.128.172","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=gmail.com"],"Received":["from sin.lore.kernel.org (sin.lore.kernel.org\n [IPv6:2600:3c15:e001:75::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g83nR3KZBz1y04\n\tfor ; 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Sun, 03 May 2026\n 18:23:31 -0700 (PDT)","Precedence":"bulk","X-Mailing-List":"linux-pci@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","References":"<20260502011446.125268-1-kartikey406@gmail.com>\n <20260503154557.GA1455207@rocinante>","In-Reply-To":"<20260503154557.GA1455207@rocinante>","From":"Deepanshu Kartikey ","Date":"Mon, 4 May 2026 06:53:19 +0530","X-Gm-Features":"AVHnY4LAzKE65UAqCQJ1ussP5u7mZnf1aw8lE27SCzqOyzz8PbJSatHCvDc7s8M","Message-ID":"\n ","Subject":"Re: [PATCH] PCI/proc: check __get_user() return value in\n proc_bus_pci_write()","To":"=?utf-8?q?Krzysztof_Wilczy=C5=84ski?= ","Cc":"bhelgaas@google.com, linux-pci@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tsyzbot+c7604c9fdd7580cca4e0@syzkaller.appspotmail.com","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable"}}]