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Peter Anvin" , "Andrew Morton" , "linux-arm-kernel@lists.infradead.org" , "Liguori, Anthony" Subject: Re: [PATCH 2/2] x86/mmap: handle worst-case heap randomization in mmap_base Thread-Topic: [PATCH 2/2] x86/mmap: handle worst-case heap randomization in mmap_base Thread-Index: AQHU2PmhiRz/TsWOLEOmeVSaHu1ISKYWLY6AgAa/s4A= Date: Tue, 26 Mar 2019 02:13:34 +0000 Message-ID: <037ACE94-A408-4CB0-BCA5-3FF9041E43B0@amazon.com> References: <20190312173248.13490-1-alisaidi@amazon.com> <20190312173248.13490-3-alisaidi@amazon.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.43.160.180] Content-Type: text/plain; charset="utf-8" Content-ID: <852CE8557F754E4FB47D67B97DC97127@amazon.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org DQoNCu+7v09uIDMvMjEvMTksIDk6MTEgQU0sICJsaW51eC1hcm0ta2VybmVsIG9uIGJlaGFsZiBv ZiBUaG9tYXMgR2xlaXhuZXIiIDxsaW51eC1hcm0ta2VybmVsLWJvdW5jZXNAbGlzdHMuaW5mcmFk ZWFkLm9yZyBvbiBiZWhhbGYgb2YgdGdseEBsaW51dHJvbml4LmRlPiB3cm90ZToNCg0KICAgIE9u IFR1ZSwgMTIgTWFyIDIwMTksIEFsaSBTYWlkaSB3cm90ZToNCiAgICANCiAgICA+IEluY3JlYXNl IG1tYXBfYmFzZSBieSB0aGUgd29yc3QtY2FzZSBicmsgcmFuZG9taXphdGlvbiBzbyB0aGF0DQog ICAgPiB0aGUgc3RhY2sgYW5kIGhlYXAgcmVtYWluIGFwYXJ0Lg0KICAgID4gDQogICAgPiBJbiBM aW51eCA0LjEzIGEgY2hhbmdlIHdhcyBjb21taXR0ZWQgdGhhdCBzcGVjaWFsIGNhc2VkIHRoZSBr ZXJuZWwgRUxGDQogICAgPiBsb2FkZXIgd2hlbiB0aGUgbG9hZGVyIGlzIGludm9rZWQgZGlyZWN0 bHkgKGVhYjA5NTMyZDQwMDsgYmluZm10X2VsZjogdXNlDQogICAgPiBFTEZfRVRfRFlOX0JBU0Ug b25seSBmb3IgUElFKS4gR2VuZXJhbGx5LCB0aGUgbG9hZGVyIGlzbuKAmXQgaW52b2tlZA0KICAg ID4gZGlyZWN0bHkgYW5kIHRoaXMgaXNzdWUgaXMgbGltaXRlZCB0byBjYXNlcyB3aGVyZSBpdCBp cywgKGUuZyB0byBzZXQgYQ0KICAgID4gbm9uLWluaGVyaXRhYmxlIExEX0xJQlJBUllfUEFUSCwg dGVzdGluZyBuZXcgdmVyc2lvbnMgb2YgdGhlIGxvYWRlcikuIEluDQogICAgPiB0aG9zZSByYXJl IGNhc2VzLCB0aGUgbG9hZGVyIGRvZXNuJ3QgdGFrZSBpbnRvIGFjY291bnQgdGhlIGFtb3VudCBv ZiBicmsNCiAgICA+IHJhbmRvbWl6YXRpb24gdGhhdCB3aWxsIGJlIGFwcGxpZWQgYnkgYXJjaF9y YW5kb21pemVfYnJrKCkuIFRoaXMgY2FuDQogICAgPiBsZWFkIHRvIHRoZSBzdGFjayBhbmQgaGVh cCBiZWluZyBhcmJpdHJhcmlseSBjbG9zZSB0byBlYWNoIG90aGVyLg0KICAgIA0KICAgIFRoYXQg ZXhwbGFpbnMgbm90IHdoeSB5b3UgbmVlZCB0aGlzIGNoYW5nZS4gV2hhdCdzIHRoZSBjb25zZXF1 ZW5jZSBvZiB0aGVtDQogICAgYmVpbmcgY2xvc2UgdG8gZWFjaCBvdGhlcj8NCiAgICANClRoZSBw cm9jZXNzIGRvZXNuJ3QgZ2V0IGl0J3MgcmVxdWVzdGVkIHN0YWNrIHNpemUgYW5kIHN0YWNrIGFs bG9jYXRpb25zIGNvdWxkIGVuZCB1cCBzY3JpYmJsaW5nIG9uIHRoZSBoZWFwLg0KDQpUaGFua3Ms DQpBbGkNCiANCg0K