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Thu, 18 Apr 2019 21:27:08 +0000 Received: from MWHPR2201MB1277.namprd22.prod.outlook.com ([fe80::b9d6:bf19:ec58:2765]) by MWHPR2201MB1277.namprd22.prod.outlook.com ([fe80::b9d6:bf19:ec58:2765%7]) with mapi id 15.20.1813.013; Thu, 18 Apr 2019 21:27:08 +0000 From: Paul Burton To: Alexandre Ghiti CC: Andrew Morton , Christoph Hellwig , Russell King , Catalin Marinas , Will Deacon , Ralf Baechle , James Hogan , Palmer Dabbelt , Albert Ou , Alexander Viro , Luis Chamberlain , Kees Cook , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mips@vger.kernel.org" , "linux-riscv@lists.infradead.org" , "linux-fsdevel@vger.kernel.org" , "linux-mm@kvack.org" Subject: Re: [PATCH v3 08/11] mips: Properly account for stack randomization and stack guard gap Thread-Topic: [PATCH v3 08/11] mips: Properly account for stack randomization and stack guard gap Thread-Index: AQHU9N7WOMS/C9RNx0iyqk626UOBSKZCcS8A Date: Thu, 18 Apr 2019 21:27:08 +0000 Message-ID: <20190418212701.dpymnwuki3g7rox2@pburton-laptop> References: <20190417052247.17809-1-alex@ghiti.fr> <20190417052247.17809-9-alex@ghiti.fr> In-Reply-To: <20190417052247.17809-9-alex@ghiti.fr> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: BYAPR02CA0046.namprd02.prod.outlook.com (2603:10b6:a03:54::23) To MWHPR2201MB1277.namprd22.prod.outlook.com (2603:10b6:301:24::17) user-agent: NeoMutt/20180716 authentication-results: spf=none (sender IP is ) smtp.mailfrom=pburton@wavecomp.com; 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received-spf: None (protection.outlook.com: wavecomp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: 8f4+5nWoBkDj6d1MLlkvJBbL7HDwiQVIXpbaTMbUbalRzhboOrsRxZoUH949lssGtYMTSYy3jxy5+j1nM/rKWn4tVwzvbGdScU9RVhY8wbH6pY12EcqIYEe/gTCLQxzWEmMzWSuSGX0GaUU+cLuTuwXR0hsJCvKOaupWI0YjGxfS3zmOoL82DAhFZa/t778WMCols7AhxapTvBIIQTsLvgWrfQH16GSsxKmGHr4qgowyOKg9YUK66JY/8Yil7SsqzfembPwfLkmIT/BRxLxyK8yFRlhTiLaHNIiCnc1cOfGDWG2TWZt92W+a20PnZs/3W2xUGl3T5g9sEZ6kUUQiRfw7K2sggJJ/3JydxgDKBWStRA6Jqn0RcBkNUscy7D614xZHrygsPek1twK/Igwi/u8uXfVsDQ/VNP4h4M/c07o= Content-Type: text/plain; charset="us-ascii" Content-ID: <7903A9C444F5B74FB67DD91CFCCC1456@namprd22.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: mips.com X-MS-Exchange-CrossTenant-Network-Message-Id: 33f5353b-dda9-4910-9587-08d6c4449c56 X-MS-Exchange-CrossTenant-originalarrivaltime: 18 Apr 2019 21:27:08.3517 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 463607d3-1db3-40a0-8a29-970c56230104 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR2201MB1424 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: Hi Alexandre, On Wed, Apr 17, 2019 at 01:22:44AM -0400, Alexandre Ghiti wrote: > This commit takes care of stack randomization and stack guard gap when > computing mmap base address and checks if the task asked for randomizatio= n. > This fixes the problem uncovered and not fixed for mips here: > https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1429066.html >=20 > Signed-off-by: Alexandre Ghiti For patches 8-10: Acked-by: Paul Burton Thanks for improving this, Paul > --- > arch/mips/mm/mmap.c | 14 ++++++++++++-- > 1 file changed, 12 insertions(+), 2 deletions(-) >=20 > diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c > index 2f616ebeb7e0..3ff82c6f7e24 100644 > --- a/arch/mips/mm/mmap.c > +++ b/arch/mips/mm/mmap.c > @@ -21,8 +21,9 @@ unsigned long shm_align_mask =3D PAGE_SIZE - 1; /* Sane= caches */ > EXPORT_SYMBOL(shm_align_mask); > =20 > /* gap between mmap and stack */ > -#define MIN_GAP (128*1024*1024UL) > -#define MAX_GAP ((TASK_SIZE)/6*5) > +#define MIN_GAP (128*1024*1024UL) > +#define MAX_GAP ((TASK_SIZE)/6*5) > +#define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) > =20 > static int mmap_is_legacy(struct rlimit *rlim_stack) > { > @@ -38,6 +39,15 @@ static int mmap_is_legacy(struct rlimit *rlim_stack) > static unsigned long mmap_base(unsigned long rnd, struct rlimit *rlim_st= ack) > { > unsigned long gap =3D rlim_stack->rlim_cur; > + unsigned long pad =3D stack_guard_gap; > + > + /* Account for stack randomization if necessary */ > + if (current->flags & PF_RANDOMIZE) > + pad +=3D (STACK_RND_MASK << PAGE_SHIFT); > + > + /* Values close to RLIM_INFINITY can overflow. */ > + if (gap + pad > gap) > + gap +=3D pad; > =20 > if (gap < MIN_GAP) > gap =3D MIN_GAP; > --=20 > 2.20.1 >=20