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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id t22sm393058pjo.45.2021.03.11.18.39.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Mar 2021 18:39:45 -0800 (PST) Date: Thu, 11 Mar 2021 18:39:44 -0800 From: Kees Cook To: Sami Tolvanen Cc: Nathan Chancellor , Nick Desaulniers , Masahiro Yamada , Will Deacon , Jessica Yu , Arnd Bergmann , Tejun Heo , bpf@vger.kernel.org, linux-hardening@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 01/17] add support for Clang CFI Message-ID: <202103111839.4A4375E@keescook> References: <20210312004919.669614-1-samitolvanen@google.com> <20210312004919.669614-2-samitolvanen@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210312004919.669614-2-samitolvanen@google.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210312_023950_929479_010A2C7D X-CRM114-Status: GOOD ( 25.16 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVGh1LCBNYXIgMTEsIDIwMjEgYXQgMDQ6NDk6MDNQTSAtMDgwMCwgU2FtaSBUb2x2YW5lbiB3 cm90ZToKPiBUaGlzIGNoYW5nZSBhZGRzIHN1cHBvcnQgZm9yIENsYW5n4oCZcyBmb3J3YXJkLWVk Z2UgQ29udHJvbCBGbG93Cj4gSW50ZWdyaXR5IChDRkkpIGNoZWNraW5nLiBXaXRoIENPTkZJR19D RklfQ0xBTkcsIHRoZSBjb21waWxlcgo+IGluamVjdHMgYSBydW50aW1lIGNoZWNrIGJlZm9yZSBl YWNoIGluZGlyZWN0IGZ1bmN0aW9uIGNhbGwgdG8gZW5zdXJlCj4gdGhlIHRhcmdldCBpcyBhIHZh bGlkIGZ1bmN0aW9uIHdpdGggdGhlIGNvcnJlY3Qgc3RhdGljIHR5cGUuIFRoaXMKPiByZXN0cmlj dHMgcG9zc2libGUgY2FsbCB0YXJnZXRzIGFuZCBtYWtlcyBpdCBtb3JlIGRpZmZpY3VsdCBmb3IK PiBhbiBhdHRhY2tlciB0byBleHBsb2l0IGJ1Z3MgdGhhdCBhbGxvdyB0aGUgbW9kaWZpY2F0aW9u IG9mIHN0b3JlZAo+IGZ1bmN0aW9uIHBvaW50ZXJzLiBGb3IgbW9yZSBkZXRhaWxzLCBzZWU6Cj4g Cj4gICBodHRwczovL2NsYW5nLmxsdm0ub3JnL2RvY3MvQ29udHJvbEZsb3dJbnRlZ3JpdHkuaHRt bAo+IAo+IENsYW5nIHJlcXVpcmVzIENPTkZJR19MVE9fQ0xBTkcgdG8gYmUgZW5hYmxlZCB3aXRo IENGSSB0byBnYWluCj4gdmlzaWJpbGl0eSB0byBwb3NzaWJsZSBjYWxsIHRhcmdldHMuIEtlcm5l bCBtb2R1bGVzIGFyZSBzdXBwb3J0ZWQKPiB3aXRoIENsYW5n4oCZcyBjcm9zcy1EU08gQ0ZJIG1v ZGUsIHdoaWNoIGFsbG93cyBjaGVja2luZyBiZXR3ZWVuCj4gaW5kZXBlbmRlbnRseSBjb21waWxl ZCBjb21wb25lbnRzLgo+IAo+IFdpdGggQ0ZJIGVuYWJsZWQsIHRoZSBjb21waWxlciBpbmplY3Rz IGEgX19jZmlfY2hlY2soKSBmdW5jdGlvbiBpbnRvCj4gdGhlIGtlcm5lbCBhbmQgZWFjaCBtb2R1 bGUgZm9yIHZhbGlkYXRpbmcgbG9jYWwgY2FsbCB0YXJnZXRzLiBGb3IKPiBjcm9zcy1tb2R1bGUg Y2FsbHMgdGhhdCBjYW5ub3QgYmUgdmFsaWRhdGVkIGxvY2FsbHksIHRoZSBjb21waWxlcgo+IGNh bGxzIHRoZSBnbG9iYWwgX19jZmlfc2xvd3BhdGhfZGlhZygpIGZ1bmN0aW9uLCB3aGljaCBkZXRl cm1pbmVzCj4gdGhlIHRhcmdldCBtb2R1bGUgYW5kIGNhbGxzIHRoZSBjb3JyZWN0IF9fY2ZpX2No ZWNrKCkgZnVuY3Rpb24uIFRoaXMKPiBwYXRjaCBpbmNsdWRlcyBhIHNsb3dwYXRoIGltcGxlbWVu dGF0aW9uIHRoYXQgdXNlcyBfX21vZHVsZV9hZGRyZXNzKCkKPiB0byByZXNvbHZlIGNhbGwgdGFy Z2V0cywgYW5kIHdpdGggQ09ORklHX0NGSV9DTEFOR19TSEFET1cgZW5hYmxlZCwgYQo+IHNoYWRv dyBtYXAgdGhhdCBzcGVlZHMgdXAgbW9kdWxlIGxvb2stdXBzIGJ5IH4zeC4KPiAKPiBDbGFuZyBp bXBsZW1lbnRzIGluZGlyZWN0IGNhbGwgY2hlY2tpbmcgdXNpbmcganVtcCB0YWJsZXMgYW5kCj4g b2ZmZXJzIHR3byBtZXRob2RzIG9mIGdlbmVyYXRpbmcgdGhlbS4gV2l0aCBjYW5vbmljYWwganVt cCB0YWJsZXMsCj4gdGhlIGNvbXBpbGVyIHJlbmFtZXMgZWFjaCBhZGRyZXNzLXRha2VuIGZ1bmN0 aW9uIHRvIDxmdW5jdGlvbj4uY2ZpCj4gYW5kIHBvaW50cyB0aGUgb3JpZ2luYWwgc3ltYm9sIHRv IGEganVtcCB0YWJsZSBlbnRyeSwgd2hpY2ggcGFzc2VzCj4gX19jZmlfY2hlY2soKSB2YWxpZGF0 aW9uLiBUaGlzIGlzbuKAmXQgY29tcGF0aWJsZSB3aXRoIHN0YW5kLWFsb25lCj4gYXNzZW1ibHkg Y29kZSwgd2hpY2ggdGhlIGNvbXBpbGVyIGRvZXNu4oCZdCBpbnN0cnVtZW50LCBhbmQgd291bGQK PiByZXN1bHQgaW4gaW5kaXJlY3QgY2FsbHMgdG8gYXNzZW1ibHkgY29kZSB0byBmYWlsLiBUaGVy ZWZvcmUsIHdlCj4gZGVmYXVsdCB0byB1c2luZyBub24tY2Fub25pY2FsIGp1bXAgdGFibGVzIGlu c3RlYWQsIHdoZXJlIHRoZSBjb21waWxlcgo+IGdlbmVyYXRlcyBhIGxvY2FsIGp1bXAgdGFibGUg ZW50cnkgPGZ1bmN0aW9uPi5jZmlfanQgZm9yIGVhY2gKPiBhZGRyZXNzLXRha2VuIGZ1bmN0aW9u LCBhbmQgcmVwbGFjZXMgYWxsIHJlZmVyZW5jZXMgdG8gdGhlIGZ1bmN0aW9uCj4gd2l0aCB0aGUg YWRkcmVzcyBvZiB0aGUganVtcCB0YWJsZSBlbnRyeS4KPiAKPiBOb3RlIHRoYXQgYmVjYXVzZSBu b24tY2Fub25pY2FsIGp1bXAgdGFibGUgYWRkcmVzc2VzIGFyZSBsb2NhbAo+IHRvIGVhY2ggY29t cG9uZW50LCB0aGV5IGJyZWFrIGNyb3NzLW1vZHVsZSBmdW5jdGlvbiBhZGRyZXNzCj4gZXF1YWxp dHkuIFNwZWNpZmljYWxseSwgdGhlIGFkZHJlc3Mgb2YgYSBnbG9iYWwgZnVuY3Rpb24gd2lsbCBi ZQo+IGRpZmZlcmVudCBpbiBlYWNoIG1vZHVsZSwgYXMgaXQncyByZXBsYWNlZCB3aXRoIHRoZSBh ZGRyZXNzIG9mIGEgbG9jYWwKPiBqdW1wIHRhYmxlIGVudHJ5LiBJZiB0aGlzIGFkZHJlc3MgaXMg cGFzc2VkIHRvIGEgZGlmZmVyZW50IG1vZHVsZSwKPiBpdCB3b27igJl0IG1hdGNoIHRoZSBhZGRy ZXNzIG9mIHRoZSBzYW1lIGZ1bmN0aW9uIHRha2VuIHRoZXJlLiBUaGlzCj4gbWF5IGJyZWFrIGNv ZGUgdGhhdCByZWxpZXMgb24gY29tcGFyaW5nIGFkZHJlc3NlcyBwYXNzZWQgZnJvbSBvdGhlcgo+ IGNvbXBvbmVudHMuCj4gCj4gQ0ZJIGNoZWNraW5nIGNhbiBiZSBkaXNhYmxlZCBpbiBhIGZ1bmN0 aW9uIHdpdGggdGhlIF9fbm9jZmkgYXR0cmlidXRlLgo+IEFkZGl0aW9uYWxseSwgQ0ZJIGNhbiBi ZSBkaXNhYmxlZCBmb3IgYW4gZW50aXJlIGNvbXBpbGF0aW9uIHVuaXQgYnkKPiBmaWx0ZXJpbmcg b3V0IENDX0ZMQUdTX0NGSS4KPiAKPiBCeSBkZWZhdWx0LCBDRkkgZmFpbHVyZXMgcmVzdWx0IGlu IGEga2VybmVsIHBhbmljIHRvIHN0b3AgYSBwb3RlbnRpYWwKPiBleHBsb2l0LiBDT05GSUdfQ0ZJ X1BFUk1JU1NJVkUgZW5hYmxlcyBhIHBlcm1pc3NpdmUgbW9kZSwgd2hlcmUgdGhlCj4ga2VybmVs IHByaW50cyBvdXQgYSByYXRlLWxpbWl0ZWQgd2FybmluZyBpbnN0ZWFkLCBhbmQgYWxsb3dzIGV4 ZWN1dGlvbgo+IHRvIGNvbnRpbnVlLiBUaGlzIG9wdGlvbiBpcyBoZWxwZnVsIGZvciBsb2NhdGlu ZyB0eXBlIG1pc21hdGNoZXMsIGJ1dAo+IHNob3VsZCBvbmx5IGJlIGVuYWJsZWQgZHVyaW5nIGRl dmVsb3BtZW50Lgo+IAo+IFNpZ25lZC1vZmYtYnk6IFNhbWkgVG9sdmFuZW4gPHNhbWl0b2x2YW5l bkBnb29nbGUuY29tPgoKUmV2aWV3ZWQtYnk6IEtlZXMgQ29vayA8a2Vlc2Nvb2tAY2hyb21pdW0u b3JnPgoKLS0gCktlZXMgQ29vawoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5l bEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4v bGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=