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Wed, 28 Jul 2021 19:05:07 +0800 Message-ID: <29f4844b1af163b0ec463fccbc9b902b3150f5c1.camel@mediatek.com> Subject: Re: [PATCH 1/2] kasan, mm: reset tag when access metadata From: Kuan-Ying Lee To: Catalin Marinas CC: Marco Elver , Nicholas Tang , Andrew Yang , Andrey Konovalov , Andrey Ryabinin , Alexander Potapenko , "Chinwen Chang" , Andrew Morton , , , , , , Date: Wed, 28 Jul 2021 19:05:07 +0800 In-Reply-To: <20210727192217.GV13920@arm.com> References: <20210727040021.21371-1-Kuan-Ying.Lee@mediatek.com> <20210727040021.21371-2-Kuan-Ying.Lee@mediatek.com> <20210727192217.GV13920@arm.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 MIME-Version: 1.0 X-MTK: N Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org T24gVHVlLCAyMDIxLTA3LTI3IGF0IDIwOjIyICswMTAwLCBDYXRhbGluIE1hcmluYXMgd3JvdGU6 DQo+IE9uIFR1ZSwgSnVsIDI3LCAyMDIxIGF0IDA0OjMyOjAyUE0gKzA4MDAsIEt1YW4tWWluZyBM ZWUgd3JvdGU6DQo+ID4gT24gVHVlLCAyMDIxLTA3LTI3IGF0IDA5OjEwICswMjAwLCBNYXJjbyBF bHZlciB3cm90ZToNCj4gPiA+ICtDYyBDYXRhbGluDQo+ID4gPiANCj4gPiA+IE9uIFR1ZSwgMjcg SnVsIDIwMjEgYXQgMDY6MDAsIEt1YW4tWWluZyBMZWUgPA0KPiA+ID4gS3Vhbi1ZaW5nLkxlZUBt ZWRpYXRlay5jb20+IHdyb3RlOg0KPiA+ID4gPiANCj4gPiA+ID4gSGFyZHdhcmUgdGFnLWJhc2Vk IEtBU0FOIGRvZXNuJ3QgdXNlIGNvbXBpbGVyIGluc3RydW1lbnRhdGlvbiwNCj4gPiA+ID4gd2UN Cj4gPiA+ID4gY2FuIG5vdCB1c2Uga2FzYW5fZGlzYWJsZV9jdXJyZW50KCkgdG8gaWdub3JlIHRh ZyBjaGVjay4NCj4gPiA+ID4gDQo+ID4gPiA+IFRodXMsIHdlIG5lZWQgdG8gcmVzZXQgdGFncyB3 aGVuIGFjY2Vzc2luZyBtZXRhZGF0YS4NCj4gPiA+ID4gDQo+ID4gPiA+IFNpZ25lZC1vZmYtYnk6 IEt1YW4tWWluZyBMZWUgPEt1YW4tWWluZy5MZWVAbWVkaWF0ZWsuY29tPg0KPiA+ID4gDQo+ID4g PiBUaGlzIGxvb2tzIHJlYXNvbmFibGUsIGJ1dCB0aGUgcGF0Y2ggdGl0bGUgaXMgbm90IHNheWlu ZyB0aGlzIGlzDQo+ID4gPiBrbWVtbGVhaywgbm9yIGRvZXMgdGhlIGRlc2NyaXB0aW9uIHNheSB3 aGF0IHRoZSBwcm9ibGVtIGlzLiBXaGF0DQo+ID4gPiBwcm9ibGVtIGRpZCB5b3UgZW5jb3VudGVy PyBXYXMgaXQgYSBmYWxzZSBwb3NpdGl2ZT8NCj4gPiANCj4gPiBrbWVtbGVhayB3b3VsZCBzY2Fu IGtlcm5lbCBtZW1vcnkgdG8gY2hlY2sgbWVtb3J5IGxlYWsuDQo+ID4gV2hlbiBpdCBzY2FucyBv biB0aGUgaW52YWxpZCBzbGFiIGFuZCBkZXJlZmVyZW5jZSwgdGhlIGlzc3VlDQo+ID4gd2lsbCBv Y2N1ciBsaWtlIGJlbG93Lg0KPiA+IA0KPiA+IFNvIEkgdGhpbmsgd2Ugc2hvdWxkIHJlc2V0IHRo ZSB0YWcgYmVmb3JlIHNjYW5uaW5nLg0KPiA+IA0KPiA+ICMgZWNobyBzY2FuID4gL3N5cy9rZXJu ZWwvZGVidWcva21lbWxlYWsNCj4gPiBbICAxNTEuOTA1ODA0XQ0KPiA+ID09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQ0KPiA+ IFsgIDE1MS45MDcxMjBdIEJVRzogS0FTQU46IG91dC1vZi1ib3VuZHMgaW4gc2Nhbl9ibG9jaysw eDU4LzB4MTcwDQo+ID4gWyAgMTUxLjkwODc3M10gUmVhZCBhdCBhZGRyIGY3ZmYwMDAwYzAwNzRl YjAgYnkgdGFzayBrbWVtbGVhay8xMzgNCj4gPiBbICAxNTEuOTA5NjU2XSBQb2ludGVyIHRhZzog W2Y3XSwgbWVtb3J5IHRhZzogW2ZlXQ0KPiANCj4gSXQgd291bGQgYmUgaW50ZXJlc3RpbmcgdG8g ZmluZCBvdXQgd2h5IHRoZSB0YWcgZG9lc24ndCBtYXRjaC4NCj4gS21lbWxlYWsNCj4gc2hvdWxk IGluIHByaW5jaXBsZSBvbmx5IHNjYW4gdmFsaWQgb2JqZWN0cyB0aGF0IGhhdmUgYmVlbiBhbGxv Y2F0ZWQNCj4gYW5kDQo+IHRoZSBwb2ludGVyIGNhbiBiZSBzYWZlbHkgZGVyZWZlcmVuY2VkLiAw eGZlIGlzIEtBU0FOX1RBR19JTlZBTElELCBzbw0KPiBpdA0KPiBlaXRoZXIgZ29lcyBwYXN0IHRo ZSBzaXplIG9mIHRoZSBvYmplY3QgKGludG8gdGhlIHJlZCB6b25lKSBvciBpdA0KPiBzdGlsbA0K PiBhY2Nlc3NlcyB0aGUgb2JqZWN0IGFmdGVyIGl0IHdhcyBtYXJrZWQgYXMgZnJlZWQgYnV0IGJl Zm9yZSBiZWluZw0KPiByZWxlYXNlZCBmcm9tIGttZW1sZWFrLg0KPiANCj4gV2l0aCBzbGFiLCBs b29raW5nIGF0IF9fY2FjaGVfZnJlZSgpLCBpdCBjYWxscyBrYXNhbl9zbGFiX2ZyZWUoKQ0KPiBi ZWZvcmUNCj4gX19fY2FjaGVfZnJlZSgpIC0+IGttZW1sZWFrX2ZyZWVfcmVjdXJzaXZlKCksIHNv IHRoZSBzZWNvbmQgc2NlbmFyaW8NCj4gaXMNCj4gcG9zc2libGUuIFdpdGggc2x1YiwgaG93ZXZl ciwgc2xhYl9mcmVlX2hvb2soKSBmaXJzdCByZWxlYXNlcyB0aGUNCj4gb2JqZWN0DQo+IGZyb20g a21lbWxlYWsgYmVmb3JlIHBvaXNvbmluZyBpdC4gQmFzZWQgb24gdGhlIHN0YWNrIGR1bXAsIHlv dSBhcmUNCj4gdXNpbmcgc2x1Yiwgc28gaXQgbWF5IGJlIHRoYXQga21lbWxlYWsgZ29lcyBpbnRv IHRoZSBvYmplY3QgcmVkDQo+IHpvbmVzLg0KPiANCj4gSSdkIGxpa2UgdGhpcyBjbGFyaWZpZWQg YmVmb3JlIGJsaW5kbHkgcmVzZXR0aW5nIHRoZSB0YWcuDQoNClRoaXMga2FzYW4gaXNzdWUgb25s eSBoYXBwZW5lZCBvbiBoYXJkd2FyZSB0YWctYmFzZWQga2FzYW4gbW9kZS4NCkJlY2F1c2Uga2Fz YW5fZGlzYWJsZV9jdXJyZW50KCkgd29ya3MgZm9yIGdlbmVyaWMgYW5kIHN3IHRhZy1iYXNlZA0K a2FzYW4uDQoNCkhXIHRhZy1iYXNlZCBrYXNhbiBkZXBlbmRzIG9uIHNsdWIgc28gc2xhYiB3aWxs IG5vdCBoaXQgdGhpcw0KaXNzdWUuDQpJIHRoaW5rIHdlIGNhbiBqdXN0IGNoZWNrIGlmIEhXIHRh Zy1iYXNlZCBrYXNhbiBpcyBlbmFibGVkIG9yIG5vdA0KYW5kIGRlY2lkZSB0byByZXNldCB0aGUg dGFnIGFzIGJlbG93Lg0KDQppZiAoa2FzYW5faGFzX2ludGVncmF0ZWRfaW5pdCgpKSAvLyBzbHVi IGNhc2UsIGh3LXRhZyBrYXNhbg0KCXBvaW50ZXIgPSAqKHVuc2lnbmVkIGxvbmcgKilrYXNhbl9y ZXNldF90YWcoKHZvaWQgKilwdHIpOw0KZWxzZQ0KCXBvaW50ZXIgPSAqcHRyOyAvLyBzbGFiDQoN CklzIHRoaXMgYmV0dGVyIG9yIGFueSBvdGhlciBzdWdnZXN0aW9ucz8NCkFueSBzdWdnZXN0aW9u IGlzIGFwcHJlY2lhdGVkLg0KDQpUaGFua3MsDQpLdWFuLVlpbmcgTGVlDQoNCj4gDQo=