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[46.139.12.213]) by smtp.gmail.com with ESMTPSA id 192sm5554039wme.13.2019.04.19.01.51.42 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 19 Apr 2019 01:51:43 -0700 (PDT) Date: Fri, 19 Apr 2019 10:51:40 +0200 From: Ingo Molnar To: "Saidi, Ali" Subject: Re: [PATCH 2/2] x86/mmap: handle worst-case heap randomization in mmap_base Message-ID: <20190419085140.GA50390@gmail.com> References: <20190312173248.13490-1-alisaidi@amazon.com> <20190312173248.13490-3-alisaidi@amazon.com> <34381CFC-A90F-4979-9802-2BA0E6539C68@amazon.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <34381CFC-A90F-4979-9802-2BA0E6539C68@amazon.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190419_015146_414104_850F8034 X-CRM114-Status: GOOD ( 13.87 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michal Hocko , Kees Cook , Jann Horn , Peter Zijlstra , Catalin Marinas , Dave Hansen , Will Deacon , X86 ML , Matthew Wilcox , LKML , Ingo Molnar , Borislav Petkov , linux-arm-kernel , "Liguori, Anthony" , "H. Peter Anvin" , Andrew Morton , Andy Lutomirski , Thomas Gleixner , "Woodhouse, David" Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org CiogU2FpZGksIEFsaSA8YWxpc2FpZGlAYW1hem9uLmNvbT4gd3JvdGU6Cgo+IO+7v09uIDMvMjcv MTksIDI6NTIgUE0sICJsaW51eC1hcm0ta2VybmVsIG9uIGJlaGFsZiBvZiBLZWVzIENvb2siIDxs aW51eC1hcm0ta2VybmVsLWJvdW5jZXNAbGlzdHMuaW5mcmFkZWFkLm9yZyBvbiBiZWhhbGYgb2Yg a2Vlc2Nvb2tAY2hyb21pdW0ub3JnPiB3cm90ZToKPiAKPiAgICAgQWRkaW5nIHNvbWUgbW9yZSBw ZW9wbGUgdG8gQ0MuLi4gd2hhdCBkbyBwZW9wbGUgdGhpbmsgYWJvdXQgdGhpcwo+ICAgICBtb3Zp bmcgb2YgdGhlIGJyayB0byBFTEZfRVRfRFlOX0JBU0UgaW4gdGhpcyBjb3JuZXItY2FzZT8gQW55 dGhpbmcKPiAgICAgdGhhdCB3b3JrZWQgYmVmb3JlIHNob3VsZCBzdGlsbCB3b3JrIChpLmUuIHRo ZSB1bHRpbWF0ZWx5LWxhdW5jaGVkCj4gICAgIGJpbmFyeSBhbHJlYWR5IGhhZCB0aGUgYnJrIHZl cnkgZmFyIGZyb20gaXRzIHRleHQsIHNvIHRoaXMgc2hvdWxkIGJlCj4gICAgIG5vIGRpZmZlcmVu dCBmcm9tIGEgQ09NUEFUX0JSSyBzdGFuZHBvaW50KS4gVGhlIG9ubHkgcmlzayBJIHNlZSBoZXJl Cj4gICAgIGlzIHRoYXQgaWYgc29tZW9uZSBzdGFydGVkIHRvIHN1ZGRlbmx5IGRlcGVuZCBvbiB0 aGUgZW50aXJlIG1lbW9yeQo+ICAgICBzcGFjZSBhYm92ZSB0aGUgbW1hcCByZWdpb24gYmVpbmcg YXZhaWxhYmxlIHdoZW4gbGF1bmNoaW5nIGJpbmFyaWVzCj4gICAgIHZpYSBhIGRpcmVjdCBsb2Fk ZXIgZXhlY3MuLi4gd2hpY2ggc2VlbXMgaGlnaGx5IHVubGlrZWx5LCBJJ2QgaG9wZToKPiAgICAg dGhpcyB3b3VsZCBtZWFuIGEgYmluYXJ5IHdvdWxkIG5vdCB3b3JrIHdoZW4gZXhlY2VkIG5vcm1h bGx5Lgo+IAo+IEtlZXMnIHByb3Bvc2FsIGFkZHJlc3NlcyB0aGUgaXNzdWUgZm9yIG1lLiBBbnlv bmUgaGF2ZSBjb25jZXJucyBvbiB0aGlzIHByb3Bvc2VkIHNvbHV0aW9uPwoKSSdkIHN1Z2dlc3Qg aW5jb3Jwb3JhdGluZyBhbGwgZmVlZGJhY2sgYW5kIHNlbmRpbmcgYSB2MiBzZXJpZXMgLSBpdCdz IAptdWNoIGVhc2llciB0byBnZXQgcGVvcGxlJ3MgYXR0ZW50aW9uIHZpYSBjb2RlIHN1Ym1pdHRl ZC4gOy0pCgpUaGFua3MsCgoJSW5nbwoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtl cm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxt YW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=