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Sun, 05 Apr 2020 05:25:55 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0355MHrs128371; Sun, 5 Apr 2020 05:25:55 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3020.oracle.com with ESMTP id 3073xt3q73-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 05 Apr 2020 05:25:55 +0000 Received: from abhmp0010.oracle.com (abhmp0010.oracle.com [141.146.116.16]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 0355PlOY013071; Sun, 5 Apr 2020 05:25:47 GMT Received: from [192.168.0.110] (/73.243.10.6) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Sat, 04 Apr 2020 22:25:46 -0700 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Subject: Re: [PATCH] mm/vmalloc: Sanitize __get_vm_area() arguments From: William Kucharski In-Reply-To: <20200404185229.GA424@pc636> Date: Sat, 4 Apr 2020 23:25:45 -0600 Cc: Peter Zijlstra , Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, jroedel@suse.de, vbabka@suse.cz, Thomas Gleixner Content-Transfer-Encoding: quoted-printable Message-Id: References: <20200404185229.GA424@pc636> To: Uladzislau Rezki X-Mailer: Apple Mail (2.3608.80.23.2.2) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9581 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxlogscore=691 adultscore=0 spamscore=0 phishscore=0 malwarescore=0 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004050051 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9581 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 phishscore=0 adultscore=0 priorityscore=1501 mlxscore=0 malwarescore=0 mlxlogscore=746 lowpriorityscore=0 spamscore=0 impostorscore=0 suspectscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004050051 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > On Apr 4, 2020, at 12:52 PM, Uladzislau Rezki = wrote: >=20 >>=20 >> =EF=BB=BFIs there any need to similarly sanitize =E2=80=9Csize=E2=80=9D= to assure start + size doesn=E2=80=99t go past =E2=80=9Cend?=E2=80=9D >>=20 > Why is that double check needed if all such tests are done deeper on = stack? If such tests ARE performed, then it doesn't matter to me whether it is = checked before or after, it just seems that nothing checks whether start + size makes some sort = of sense with respect to end. I admit I didn't walk through all the routines to see if such a check = would be superfluous.