From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0A381C433FE for ; Sat, 25 Sep 2021 19:07:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E64AF6109D for ; Sat, 25 Sep 2021 19:07:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229816AbhIYTIn (ORCPT ); Sat, 25 Sep 2021 15:08:43 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.86.151]:54006 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229804AbhIYTIl (ORCPT ); Sat, 25 Sep 2021 15:08:41 -0400 Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-161-wVsmmQEKP26rzW7cxYafgg-1; Sat, 25 Sep 2021 20:07:03 +0100 X-MC-Unique: wVsmmQEKP26rzW7cxYafgg-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) by AcuMS.aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Sat, 25 Sep 2021 20:07:02 +0100 Received: from AcuMS.Aculab.com ([fe80::994c:f5c2:35d6:9b65]) by AcuMS.aculab.com ([fe80::994c:f5c2:35d6:9b65%12]) with mapi id 15.00.1497.023; Sat, 25 Sep 2021 20:07:02 +0100 From: David Laight To: 'Jann Horn' , Kees Cook CC: Josh Poimboeuf , Vito Caputo , linux-kernel , "x86@kernel.org" , Qi Zheng , "peterz@infradead.org" , "luto@kernel.org" Subject: RE: CONFIG_ORC_UNWINDER=y breaks get_wchan()? Thread-Topic: CONFIG_ORC_UNWINDER=y breaks get_wchan()? Thread-Index: AQHXsNcuqtoUBVFLwk2kLaGlW2BOzKu1GzQg Date: Sat, 25 Sep 2021 19:07:02 +0000 Message-ID: References: <20210921193249.el476vlhg5k6lfcq@shells.gnugeneration.com> <20210922001537.4ktg3r2ky3b3r6yp@treble> <202109211931.E6E33500E8@keescook> In-Reply-To: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogSmFubiBIb3JuDQo+IFNlbnQ6IDI0IFNlcHRlbWJlciAyMDIxIDAxOjAwDQouLi4NCj4g PiBOb3JtYWxseSB3Y2hhbiBpcyBwcm90ZWN0ZWQgYnk6DQo+ID4NCj4gPiAgICAgICAgIHB0cmFj ZV9tYXlfYWNjZXNzKHRhc2ssIFBUUkFDRV9NT0RFX1JFQURfRlNDUkVEUykNCj4gPg0KPiA+IEkg bWlnaHQgYXJndWUgdGhhdCB0aGlzIGNoZWNrIGlzbid0IHJpZ2h0IC0tIGl0IG5lZWRzIHRvIGJl IHVzaW5nDQo+ID4gZl9jcmVkLCBidXQgSSdsbCBsZXQgSmFubiBhbnN3ZXIgbW9yZSB0aGVyZS4N Cj4gPg0KPiA+ID4gLi4uIHNpbmNlIHByZXN1bWFibHkgcHJvY19waWRfd2NoYW4oKSdzIHVzZSBv ZiAnJXBzJyBjYW4gcmVzdWx0IGluIGFuDQo+ID4gPiBhY3R1YWwgYWRkcmVzcyBnZXR0aW5nIHBy aW50ZWQgaWYgdGhlIHVud2luZCBnZXRzIGNvbmZ1c2VkLCB0aGFua3MgdG8NCj4gPiA+IF9fc3By aW50X3N5bWJvbCgpJ3MgYmFja3VwIG9wdGlvbiBpZiBrYWxsc3ltc19sb29rdXBfYnVpbGRpZCgp IGRvZXNuJ3QNCj4gPiA+IGZpbmQgYSBuYW1lLg0KPiA+DQo+ID4gRXcsIHllYWgsIF9fc3ByaW50 X3N5bWJvbCgpIGZhbGxzIGJhY2sgdG8gZXhwb3NpbmcgYWRkcmVzc2VzLiA6KA0KPiA+DQo+ID4g ICAgICAgICBuYW1lID0ga2FsbHN5bXNfbG9va3VwX2J1aWxkaWQoYWRkcmVzcywgJnNpemUsICZv ZmZzZXQsICZtb2RuYW1lLCAmYnVpbGRpZCwNCj4gPiAgICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICBidWZmZXIpOw0KPiA+ICAgICAgICAgaWYgKCFuYW1lKQ0KPiA+ICAgICAg ICAgICAgICAgICByZXR1cm4gc3ByaW50ZihidWZmZXIsICIweCVseCIsIGFkZHJlc3MgLSBzeW1i b2xfb2Zmc2V0KTsNCj4gDQo+IFdoYWFhYXQ/IFRoYXQncyBub3QgaG93IHdjaGFuIHdvcmtlZCB3 aGVuIEkgbG9va2VkIGF0IHRoaXMgdGhlIGxhc3QNCj4gdGltZSBhIGZldyB5ZWFycyBhZ28uLi4N Cg0KSG1tbW0uLi4uDQpIaXN0b3JpY2FsbHkgKGFuZCBJIG1lYW4gU1lTViBhbmQgcHJvYmFibHkg QlNEKSB0aGUgJ3djaGFuJw0Kd2FzIHRoZSAndG9rZW4nIHBhc3NlZCB0byB0aGUga2VybmVsIHNs ZWVwKCkgZnVuY3Rpb24gYW5kDQp2YWx1ZSB0aGF0IG5lZWRlZCB0byBiZSBwYXNzZWQgdG8gd2Fr ZXVwKCkgdG8gZ2V0IHRoZSBwcm9jZXNzDQpyZXNjaGVkdWxlZC4NCkl0IHdhcyB1c3VhbGx5IHRo ZSBhZGRyZXNzIG9mIHNvbWV0aGluZyBhc3NvY2lhdGVkIHdpdGggdGhlDQpzbGVlcCAtIGJ1dCBk aWRuJ3QgaGF2ZSB0byBiZS4NCkxpbnV4IGRvZXNuJ3QgZG8gcHJvY2VzcyBzbGVlcC93YWtldXAg dGhlIHNhbWUgd2F5Lg0KDQpUaGUgbmVhcmVzdCB0aGluZyB3b3VsZCBiZSAnc3RydWN0IHdhaXRf cXVldWVfaGVhZCcuDQpCdXQgdGhlIGFkZHJlc3Mgb2YgdGhhdCBpc24ndCBhIHVzZWZ1bCB2YWx1 ZS4NClBsYXVzaWJseSB0aGUgYWRkcmVzcyBvZiB0aGUgZnVuY3Rpb24gdGhhdCBpbml0aWFsaXNl cw0KdGhlIHdhaXRfcXVldWVfaGVhZCBjb3VsZCBiZSBwdXQgaW50byBpdCBhbmQgdGhhdA0KdmFs dWUgc2F2ZWQgYnkgc2NoZWR1bGUoKSB0byB0aGF0IGl0IGNhbiBiZSByZXR1cm5lZA0KYXMgdGhl ICd3Y2hhbicuDQoNCglEYXZpZA0KDQotDQpSZWdpc3RlcmVkIEFkZHJlc3MgTGFrZXNpZGUsIEJy YW1sZXkgUm9hZCwgTW91bnQgRmFybSwgTWlsdG9uIEtleW5lcywgTUsxIDFQVCwgVUsNClJlZ2lz dHJhdGlvbiBObzogMTM5NzM4NiAoV2FsZXMpDQo=