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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 1 Oct 2019 01:46:30 +0100 Received: from d06av24.portsmouth.uk.ibm.com (mk.ibm.com [9.149.105.60]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x910k1Jv37224860 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 1 Oct 2019 00:46:01 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F1CA342041; Tue, 1 Oct 2019 00:46:29 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9DAE74203F; Tue, 1 Oct 2019 00:46:29 +0000 (GMT) Received: from ozlabs.au.ibm.com (unknown [9.192.253.14]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 1 Oct 2019 00:46:29 +0000 (GMT) Received: from adsilva.ozlabs.ibm.com (haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id E989EA00F8; Tue, 1 Oct 2019 10:46:25 +1000 (AEST) From: "Alastair D'Silva" To: alastair@d-silva.org Cc: Andrew Morton , Oscar Salvador , Michal Hocko , David Hildenbrand , Pavel Tatashin , Dan Williams , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v7 0/1] Add bounds check for Hotplugged memory Date: Tue, 1 Oct 2019 10:46:14 +1000 X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 19100100-0020-0000-0000-00000373345C X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19100100-0021-0000-0000-000021C91151 Message-Id: <20191001004617.7536-1-alastair@au1.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-09-30_14:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910010006 Content-Transfer-Encoding: quoted-printable 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: From: Alastair D'Silva This series adds bounds checks for hotplugged memory, ensuring that it is within the physically addressable range (for platforms that define MAX_(POSSIBLE_)PHYSMEM_BITS. This allows for early failure, rather than attempting to access bogus section numbers. Changelog: V7: - Cast PFN_PHYS as u64 since it's type is platform dependant V6: - Fix printf formats V5: - Factor out calculation into max_allowed var - Declare unchanging vars as const - Use PFN_PHYS macro instead of shifting by PAGE_SHIFT V4: - Relocate call to __add_pages - Add a warning when the addressable check fails V3: - Perform the addressable check before we take the hotplug lock V2: - Don't use MAX_POSSIBLE_PHYSMEM_BITS as it's wider that what may be available Alastair D'Silva (1): memory_hotplug: Add a bounds check to __add_pages mm/memory_hotplug.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) --=20 2.21.0