From mboxrd@z Thu Jan 1 00:00:00 1970 From: Szabolcs Nagy Subject: Re: [PATCH] clone3: validate stack arguments Date: Fri, 1 Nov 2019 14:57:10 +0000 Message-ID: References: <20191031113608.20713-1-christian.brauner@ubuntu.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20191031113608.20713-1-christian.brauner@ubuntu.com> Content-Language: en-US Content-ID: Sender: stable-owner@vger.kernel.org To: Christian Brauner , "linux-kernel@vger.kernel.org" , Florian Weimer , GNU C Library Cc: nd , Arnd Bergmann , Kees Cook , Jann Horn , David Howells , Ingo Molnar , Oleg Nesterov , Linus Torvalds , Peter Zijlstra , "linux-api@vger.kernel.org" , "stable@vger.kernel.org" List-Id: linux-api@vger.kernel.org T24gMzEvMTAvMjAxOSAxMTozNiwgQ2hyaXN0aWFuIEJyYXVuZXIgd3JvdGU6DQo+IGRpZmYgLS1n aXQgYS9pbmNsdWRlL3VhcGkvbGludXgvc2NoZWQuaCBiL2luY2x1ZGUvdWFwaS9saW51eC9zY2hl ZC5oDQo+IGluZGV4IDk5MzM1ZTFmNGEyNy4uMjViNGZhMDBiYWQxIDEwMDY0NA0KPiAtLS0gYS9p bmNsdWRlL3VhcGkvbGludXgvc2NoZWQuaA0KPiArKysgYi9pbmNsdWRlL3VhcGkvbGludXgvc2No ZWQuaA0KPiBAQCAtNTEsNiArNTEsMTAgQEANCj4gICAqICAgICAgICAgICAgICAgc2VudCB3aGVu IHRoZSBjaGlsZCBleGl0cy4NCj4gICAqIEBzdGFjazogICAgICAgU3BlY2lmeSB0aGUgbG9jYXRp b24gb2YgdGhlIHN0YWNrIGZvciB0aGUNCj4gICAqICAgICAgICAgICAgICAgY2hpbGQgcHJvY2Vz cy4NCj4gKyAqICAgICAgICAgICAgICAgTm90ZSwgQHN0YWNrIGlzIGV4cGVjdGVkIHRvIHBvaW50 IHRvIHRoZQ0KPiArICogICAgICAgICAgICAgICBsb3dlc3QgYWRkcmVzcy4gVGhlIHN0YWNrIGRp cmVjdGlvbiB3aWxsIGJlDQo+ICsgKiAgICAgICAgICAgICAgIGRldGVybWluZWQgYnkgdGhlIGtl cm5lbCBhbmQgc2V0IHVwDQo+ICsgKiAgICAgICAgICAgICAgIGFwcHJvcHJpYXRlbHkgYmFzZWQg b24gQHN0YWNrX3NpemUuDQo+ICAgKiBAc3RhY2tfc2l6ZTogIFRoZSBzaXplIG9mIHRoZSBzdGFj ayBmb3IgdGhlIGNoaWxkIHByb2Nlc3MuDQo+ICAgKiBAdGxzOiAgICAgICAgIElmIENMT05FX1NF VFRMUyBpcyBzZXQsIHRoZSB0bHMgZGVzY3JpcHRvcg0KPiAgICogICAgICAgICAgICAgICBpcyBz ZXQgdG8gdGxzLg0KPiBkaWZmIC0tZ2l0IGEva2VybmVsL2ZvcmsuYyBiL2tlcm5lbC9mb3JrLmMN Cj4gaW5kZXggYmNkZjUzMTI1MjEwLi41NWFmNjkzMWM2ZWMgMTAwNjQ0DQo+IC0tLSBhL2tlcm5l bC9mb3JrLmMNCj4gKysrIGIva2VybmVsL2ZvcmsuYw0KPiBAQCAtMjU2MSw3ICsyNTYxLDM1IEBA IG5vaW5saW5lIHN0YXRpYyBpbnQgY29weV9jbG9uZV9hcmdzX2Zyb21fdXNlcihzdHJ1Y3Qga2Vy bmVsX2Nsb25lX2FyZ3MgKmthcmdzLA0KPiAgCXJldHVybiAwOw0KPiAgfQ0KPiAgDQo+IC1zdGF0 aWMgYm9vbCBjbG9uZTNfYXJnc192YWxpZChjb25zdCBzdHJ1Y3Qga2VybmVsX2Nsb25lX2FyZ3Mg KmthcmdzKQ0KPiArLyoqDQo+ICsgKiBjbG9uZTNfc3RhY2tfdmFsaWQgLSBjaGVjayBhbmQgcHJl cGFyZSBzdGFjaw0KPiArICogQGthcmdzOiBrZXJuZWwgY2xvbmUgYXJncw0KPiArICoNCj4gKyAq IFZlcmlmeSB0aGF0IHRoZSBzdGFjayBhcmd1bWVudHMgdXNlcnNwYWNlIGdhdmUgdXMgYXJlIHNh bmUuDQo+ICsgKiBJbiBhZGRpdGlvbiwgc2V0IHRoZSBzdGFjayBkaXJlY3Rpb24gZm9yIHVzZXJz cGFjZSBzaW5jZSBpdCdzIGVhc3kgZm9yIHVzIHRvDQo+ICsgKiBkZXRlcm1pbmUuDQo+ICsgKi8N Cj4gK3N0YXRpYyBpbmxpbmUgYm9vbCBjbG9uZTNfc3RhY2tfdmFsaWQoc3RydWN0IGtlcm5lbF9j bG9uZV9hcmdzICprYXJncykNCj4gK3sNCj4gKwlpZiAoa2FyZ3MtPnN0YWNrID09IDApIHsNCj4g KwkJaWYgKGthcmdzLT5zdGFja19zaXplID4gMCkNCj4gKwkJCXJldHVybiBmYWxzZTsNCj4gKwl9 IGVsc2Ugew0KPiArCQlpZiAoa2FyZ3MtPnN0YWNrX3NpemUgPT0gMCkNCj4gKwkJCXJldHVybiBm YWxzZTsNCj4gKw0KPiArCQlpZiAoIWFjY2Vzc19vaygodm9pZCBfX3VzZXIgKilrYXJncy0+c3Rh Y2ssIGthcmdzLT5zdGFja19zaXplKSkNCj4gKwkJCXJldHVybiBmYWxzZTsNCj4gKw0KPiArI2lm ICFkZWZpbmVkKENPTkZJR19TVEFDS19HUk9XU1VQKSAmJiAhZGVmaW5lZChDT05GSUdfSUE2NCkN Cj4gKwkJa2FyZ3MtPnN0YWNrICs9IGthcmdzLT5zdGFja19zaXplOw0KPiArI2VuZGlmDQo+ICsJ fQ0KDQpmcm9tIHRoZSBkZXNjcmlwdGlvbiBpdCBpcyBub3QgY2xlYXIgd2hvc2UNCnJlc3BvbnNp YmlsaXR5IGl0IGlzIHRvIGd1YXJhbnRlZSB0aGUgYWxpZ25tZW50DQpvZiBzcCBvbiBlbnRyeS4N Cg0KaSB0aGluayAwIHN0YWNrIHNpemUgbWF5IHdvcmsgaWYgc2lnbmFscyBhcmUNCmJsb2NrZWQg YW5kIHRoZW4gcHJvaGliaXRpbmcgaXQgbWlnaHQgbm90IGJlDQp0aGUgcmlnaHQgdGhpbmcuDQoN Cml0J3Mgbm90IGNsZWFyIGhvdyBsaWJjIHNob3VsZCBkZWFsIHdpdGggdjUuMw0Ka2VybmVscyB3 aGljaCBkb24ndCBoYXZlIHRoZSBzdGFjays9c3RhY2tfc2l6ZQ0KbG9naWMuDQo=