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Wed, 23 Jun 2021 15:31:24 +0800 Message-ID: Subject: Re: [PATCH] kasan: unpoison use memset to init unaligned object size From: Yee Lee To: Andrey Konovalov CC: , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Andrew Morton , Matthias Brugger , "open list:KASAN" , "open list:MEMORY MANAGEMENT" , open list , "moderated list:ARM/Mediatek SoC support" , "moderated list:ARM/Mediatek SoC support" , Marco Elver Date: Wed, 23 Jun 2021 15:31:24 +0800 In-Reply-To: References: <20210621154442.18463-1-yee.lee@mediatek.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 Authentication-Results: imf20.hostedemail.com; dkim=pass header.d=mediatek.com header.s=dk header.b=YpZi2Znu; dmarc=pass (policy=none) header.from=mediatek.com; spf=pass (imf20.hostedemail.com: domain of yee.lee@mediatek.com designates 216.200.240.185 as permitted sender) smtp.mailfrom=yee.lee@mediatek.com X-Rspamd-Server: rspam02 X-Stat-Signature: 4dns8h3rccxhej9uit5opguzbsr4kjs4 X-Rspamd-Queue-Id: A7B0E98B X-HE-Tag: 1624433495-980835 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: T24gVHVlLCAyMDIxLTA2LTIyIGF0IDE3OjAzICswMzAwLCBBbmRyZXkgS29ub3ZhbG92IHdyb3Rl Og0KPiBPbiBNb24sIEp1biAyMSwgMjAyMSBhdCA2OjQ1IFBNIDx5ZWUubGVlQG1lZGlhdGVrLmNv bT4gd3JvdGU6DQo+ID4gDQo+ID4gRnJvbTogWWVlIExlZSA8eWVlLmxlZUBtZWRpYXRlay5jb20+ DQo+ID4gDQo+ID4gVGhpcyBwYXRjaCBhZGRzIGEgbWVtc2V0IHRvIGluaXRpYWxpemUgb2JqZWN0 IG9mIHVuYWxpZ25lZCBzaXplLg0KPiA+IER1aW5nIHRvIHRoZSBNVEUgZ3JhbnVscml0eSwgdGhl IGludGVncmF0ZWQgaW5pdGlhbGl6YXRpb24gdXNpbmcNCj4gPiBod3RhZyBpbnN0cnVjdGlvbiB3 aWxsIGZvcmNlIGNsZWFyaW5nIG91dCBieXRlcyBpbiBncmFudWxhciBzaXplLA0KPiA+IHdoaWNo IG1heSBjYXVzZSB1bmRlc2lyZWQgZWZmZWN0LCBzdWNoIGFzIG92ZXJ3cml0aW5nIHRvIHRoZQ0K PiA+IHJlZHpvbmUNCj4gPiBvZiBTTFVCIGRlYnVnLiBJbiB0aGlzIHBhdGNoLCBmb3IgdGhlIHVu YWxpZ25lZCBvYmplY3Qgc2l6ZSwNCj4gPiBmdW5jdGlvbg0KPiA+IHVzZXMgbWVtc2V0IHRvIGlu aXRhaWxpemUgY29udGV4dCBpbnN0ZWFkIG9mIHRoZSBod3RhZyBpbnN0cnVjdGlvbi4NCj4gPiAN Cj4gPiBTaWduZWQtb2ZmLWJ5OiBZZWUgTGVlIDx5ZWUubGVlQG1lZGlhdGVrLmNvbT4NCj4gPiAt LS0NCj4gPiAgbW0va2FzYW4va2FzYW4uaCB8IDUgKysrKy0NCj4gPiAgMSBmaWxlIGNoYW5nZWQs IDQgaW5zZXJ0aW9ucygrKSwgMSBkZWxldGlvbigtKQ0KPiA+IA0KPiA+IGRpZmYgLS1naXQgYS9t bS9rYXNhbi9rYXNhbi5oIGIvbW0va2FzYW4va2FzYW4uaA0KPiA+IGluZGV4IDhmNDUwYmMyODA0 NS4uZDhmYWE2NDYxNGI3IDEwMDY0NA0KPiA+IC0tLSBhL21tL2thc2FuL2thc2FuLmgNCj4gPiAr KysgYi9tbS9rYXNhbi9rYXNhbi5oDQo+ID4gQEAgLTM4Nyw4ICszODcsMTEgQEAgc3RhdGljIGlu bGluZSB2b2lkIGthc2FuX3VucG9pc29uKGNvbnN0IHZvaWQNCj4gPiAqYWRkciwgc2l6ZV90IHNp emUsIGJvb2wgaW5pdCkNCj4gPiANCj4gPiAgICAgICAgIGlmIChXQVJOX09OKCh1bnNpZ25lZCBs b25nKWFkZHIgJiBLQVNBTl9HUkFOVUxFX01BU0spKQ0KPiA+ICAgICAgICAgICAgICAgICByZXR1 cm47DQo+ID4gKyAgICAgICBpZiAoaW5pdCAmJiAoKHVuc2lnbmVkIGxvbmcpc2l6ZSAmIEtBU0FO X0dSQU5VTEVfTUFTSykpIHsNCj4gPiArICAgICAgICAgICAgICAgaW5pdCA9IGZhbHNlOw0KPiA+ ICsgICAgICAgICAgICAgICBtZW1zZXQoKHZvaWQgKilhZGRyLCAwLCBzaXplKTsNCj4gPiArICAg ICAgIH0NCj4gDQo+IFdpdGggdGhpcyBpbXBsZW1lbnRhdGlvbiwgd2UgbG9vc2UgdGhlIGJlbmVm aXQgb2Ygc2V0dGluZyB0YWdzIGFuZA0KPiBpbml0aWFsaXppbmcgbWVtb3J5IHdpdGggdGhlIHNh bWUgaW5zdHJ1Y3Rpb25zLg0KPiANCj4gUGVyaGFwcyBhIGJldHRlciBpbXBsZW1lbnRhdGlvbiB3 b3VsZCBiZSB0byBjYWxsDQo+IGh3X3NldF9tZW1fdGFnX3JhbmdlKCkgd2l0aCB0aGUgc2l6ZSBy b3VuZGVkIGRvd24sIGFuZCB0aGVuDQo+IHNlcGFyYXRlbHkNCj4gZGVhbCB3aXRoIHRoZSBsZWZ0 b3ZlciBtZW1vcnkuDQoNClllcywgdGhpcyBmdWxseSB0YWtlcyB0aGUgYWR2YW50YWdlIG9mIGh3 IGluc3RydWN0aW9uLiANCkhvd2V2ZXIsIHRoZSBsZWZ0b3ZlciBtZW1vcnkgbmVlZHMgb25lIG1v cmUgaHdfc2V0X21lbV90YWdfcmFuZ2UoKSBmb3INCnByb3RlY3Rpb24gYXMgd2VsbC4NCg0KSWYg dGhlIGV4dHJhIHBhdGggaXMgb25seSBleGVjdXRlZCBhcyBDT05GSUdfU0xVQl9ERUJVRywgdGhl DQpwZXJmb3JtYW5jZSBsb3N0IHdvdWxkIGJlIGxlc3MgY29uY2VybmVkLg0KDQo+IA0KPiA+ICAg ICAgICAgc2l6ZSA9IHJvdW5kX3VwKHNpemUsIEtBU0FOX0dSQU5VTEVfU0laRSk7DQo+ID4gLQ0K PiA+ICAgICAgICAgaHdfc2V0X21lbV90YWdfcmFuZ2UoKHZvaWQgKilhZGRyLCBzaXplLCB0YWcs IGluaXQpOw0KPiA+ICB9DQo+ID4gDQo+ID4gLS0NCj4gPiAyLjE4LjANCj4gPiANCg==