From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Vetter Subject: Re: [PATCH v2] drm/i915: Fix possible security hole in command parsing Date: Fri, 8 May 2015 16:25:38 +0200 Message-ID: <20150508142538.GG15256@phenom.ffwll.local> References: <554212BF.1040309@zoho.com> <20150508112448.GD15256@phenom.ffwll.local> <554CB99A.3090501@zoho.com> <87d22bgo73.fsf@gaia.fi.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mail-wi0-f174.google.com (mail-wi0-f174.google.com [209.85.212.174]) by gabe.freedesktop.org (Postfix) with ESMTP id B90296E16D for ; Fri, 8 May 2015 07:23:19 -0700 (PDT) Received: by widdi4 with SMTP id di4so31749224wid.0 for ; Fri, 08 May 2015 07:23:18 -0700 (PDT) Content-Disposition: inline In-Reply-To: <87d22bgo73.fsf@gaia.fi.intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Mika Kuoppala Cc: "Rebecca N. Palmer" , intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org T24gRnJpLCBNYXkgMDgsIDIwMTUgYXQgMDU6MDQ6NDhQTSArMDMwMCwgTWlrYSBLdW9wcGFsYSB3 cm90ZToKPiAiUmViZWNjYSBOLiBQYWxtZXIiIDxyZWJlY2NhX3BhbG1lckB6b2hvLmNvbT4gd3Jp dGVzOgo+IAo+IEhpLAo+IAo+ID4+IHdoZXJlIGNtZHBhcnNlciBpcyBkaXNhYmxlZCwgYmF0Y2hf b2JqIGlzCj4gPj4gbGVmdCBkYW5nbGluZwo+ID4gU29ycnkhICBGaXhlZCBub3cuCj4gPgo+IAo+ IFRoZXJlIGlzIGFic29sdXRlbHkgbm90aGluZyB0byBiZSBzb3JyeSBhYm91dC4KPiAKPiA+IFRo aXMgdmVyc2lvbiBhbHNvIGJyaW5ncyBleGVjX3N0YXJ0ID0gMCBpbnNpZGUgdGhpcyBjaGVjaywg YXMgaXQKPiA+IGFwcGVhcnMgdG8gYmUgdGhlcmUgYmVjYXVzZSB0aGUgY29weWluZyAoaTkxNV9j bWRfcGFyc2VyLmM6MTA1NCkKPiA+IHJlbW92ZXMgYW55IG9mZnNldCB0aGUgb3JpZ2luYWwgbWln aHQgaGF2ZSBoYWQuCj4gPgo+ID4gV2hlbiB0ZXN0ZWQgb24gbmV4dC0yMDE1MDUwOCAoNjc1YjNm YiksIGl0IHBhc3NlZCBteSBjaGVja3MKPiA+IChsaWJ2YSB0ZXN0cywgdmxjIHZpZGVvLCBnbHhn ZWFycywgYmVpZ25ldCB0ZXN0cyksIGFuZCBkaWRuJ3QKPiA+IHNob3cgdGhlICJtaXNzaW5nIHdp bmRvdyB0aXRsZSBiYXIiIHByb2JsZW0gWzAtMV0gaW4gMyBhdHRlbXB0cywKPiA+IGJ1dCBnaXZl biB0aGUgaW50ZXJtaXR0ZW50IG5hdHVyZSBvZiB0aGF0IEkgY2FuJ3QgYmUgc3VyZS4KPiA+Cj4g PiBJIHN0aWxsIGNhbid0IGdpdmUgdXNlZnVsIGktZy10IHJlc3VsdHMsIGFzIGl0IHdvcmtzIG9u IDMuMTYKPiA+IGJ1dCByZXBvcnRzICJHUFUgSEFORyIgZm9yIG1vc3QgdGVzdHMgb24gNC4wIGFu ZCAoYm90aCBwYXRjaGVkIGFuZAo+ID4gdW5wYXRjaGVkKSBuZXh0IChzY3JpcHRzL3J1bi10ZXN0 cy5zaCBhdCB0aGUgcmVjb3ZlcnktbW9kZQo+ID4gKHNpbmdsZS11c2VyLW1vZGUpIHByb21wdCwg Ym90aCBpLWctdCAxLjEwIGFuZCBsYXRlc3QgZ2l0KS4KPiA+Cj4gPiBbMF0gaHR0cDovL2xpc3Rz LmZyZWVkZXNrdG9wLm9yZy9hcmNoaXZlcy9pbnRlbC1nZngvMjAxNS1NYXkvMDY1NzA1Lmh0bWwK PiA+IFsxXSBodHRwOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL2FyY2hpdmVzL2ludGVsLWdmeC8y MDE1LU1heS8wNjU5MDYuaHRtbAo+ID4KPiA+IC0tLQoKSnVzdCBhbiBzaWRlOiBnaXQgZHJvcHMg ZXZlcnl0aGluZyBfYmVsb3dfIHRoZSAtLS0gbGluZSBmcm9tIHRoZSBjb21taXQKbWVzc2FnZSB3 aGVuIGFwcGx5aW5nIHRoZSBwYXRjaC4gSGVuY2UgY29tbWVudHMgbGlrZSB0aGUgYWJvdmUgc2hv dWxkIGdvCmJlbG93IHRoYXQgbGluZSwgYW5kIHRoZSByZWFsIGNvbW1pdCBtZXNzYWdlIGFib3Zl LiBBbHNvIHlvdXIgY29tbWl0Cm1lc3NhZ2UgZm9yIHYyIGRvZXNuJ3QgbWVudGlvbiBob3cgdGhp cyBidWcgd2FzIGludHJvZHVjZWQsIHdoaWNoIGlzCmNydWNpYWwgaW5mb3JtYXRpb24uIEkndmUg c3RpdGNoZWQgc29tZXRoaW5nIHRvZ2V0aGVyLgoKPiA+IGk5MTVfZ2VtX2V4ZWNidWZmZXJfcGFy c2UgcmV0dXJucyB0aGUgb3JpZ2luYWwgYmF0Y2hfb2JqIG9uIGJhdGNoZXMKPiA+IGl0IGNhbid0 IGNoZWNrIChjdXJyZW50bHksIGNoYWluZWQgYmF0Y2hlcykuICBEb24ndCBzZXQgdGhlIHNlY3Vy ZQo+ID4gYml0IGluIHRoaXMgY2FzZS4KPiA+Cj4gPiB2MiAodGhhbmtzIHRvIE1pa2EgS3VvcHBh bGEpOgo+ID4gRG9uJ3QgbGVhdmUgYmF0Y2hfb2JqIHVuc2V0IHdoZW4gdGhlIHBhcnNlciBpcyBu b3QgcnVuLgo+ID4gT25seSBkbyBleGVjX3N0YXJ0ID0gMCBvbiBwYXJzZWQgYmF0Y2hlcy4KPiA+ IEFkZCBjb21tZW50cy4KPiA+Cj4gPiBTaWduZWQtb2ZmLWJ5OiBSZWJlY2NhIFBhbG1lciA8cmVi ZWNjYV9wYWxtZXJAem9oby5jb20+Cj4gPgo+ID4gZGlmZiAtLWdpdCBhL2RyaXZlcnMvZ3B1L2Ry bS9pOTE1L2k5MTVfZ2VtX2V4ZWNidWZmZXIuYyBiL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2k5MTVf Z2VtX2V4ZWNidWZmZXIuYwo+ID4gaW5kZXggN2FiNjNkOS4uMmZiNmRjMSAxMDA2NDQKPiA+IC0t LSBhL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2k5MTVfZ2VtX2V4ZWNidWZmZXIuYwo+ID4gKysrIGIv ZHJpdmVycy9ncHUvZHJtL2k5MTUvaTkxNV9nZW1fZXhlY2J1ZmZlci5jCj4gPiBAQCAtMTU0MCwy OCArMTU0MCwzOCBAQCBpOTE1X2dlbV9kb19leGVjYnVmZmVyKHN0cnVjdCBkcm1fZGV2aWNlICpk ZXYsIHZvaWQgKmRhdGEsCj4gPiAgCX0KPiA+ICAKPiA+ICAJaWYgKGk5MTVfbmVlZHNfY21kX3Bh cnNlcihyaW5nKSAmJiBhcmdzLT5iYXRjaF9sZW4pIHsKPiA+IC0JCWJhdGNoX29iaiA9IGk5MTVf Z2VtX2V4ZWNidWZmZXJfcGFyc2UocmluZywKPiA+ICsJCXN0cnVjdCBkcm1faTkxNV9nZW1fb2Jq ZWN0ICpwYXJzZWRfYmF0Y2hfb2JqOwo+ID4gKwo+ID4gKwkJcGFyc2VkX2JhdGNoX29iaiA9IGk5 MTVfZ2VtX2V4ZWNidWZmZXJfcGFyc2UocmluZywKPiA+ICAJCQkJCQkgICAgICAmc2hhZG93X2V4 ZWNfZW50cnksCj4gPiAgCQkJCQkJICAgICAgZWIsCj4gPiAgCQkJCQkJICAgICAgYmF0Y2hfb2Jq LAo+ID4gIAkJCQkJCSAgICAgIGFyZ3MtPmJhdGNoX3N0YXJ0X29mZnNldCwKPiA+ICAJCQkJCQkg ICAgICBhcmdzLT5iYXRjaF9sZW4sCj4gPiAgCQkJCQkJICAgICAgZmlsZS0+aXNfbWFzdGVyKTsK PiA+IC0JCWlmIChJU19FUlIoYmF0Y2hfb2JqKSkgewo+ID4gLQkJCXJldCA9IFBUUl9FUlIoYmF0 Y2hfb2JqKTsKPiA+ICsJCWlmIChJU19FUlIocGFyc2VkX2JhdGNoX29iaikpIHsKPiA+ICsJCQkv KiBCYXRjaCByZWplY3RlZCBieSBwYXJzZXIsIG9yIGFuIGVycm9yCj4gPiBvY2N1cnJlZCAqLwo+ IAo+IFRoaXMgY29tbWVudCBzaG91bGQgYmUgb21pdHRlZCBhcyB0aGUgcmVqZWN0aW9uIHBhcnQg aXMgbm90Cj4gdmFsaWQgaW4gaGVyZSBhbmQgdGhlIGVycm9yIHBhcnQgaXMgcmVkdWRhbnQuIERh bmllbCBjYW4gc3F1YXNoIGl0IHdoaWxlCj4gYXBwbHlpbmcgSSB0aGluay4KCkRvbmUgd2hpbGUg YXBwbHlpbmcuCgo+IAo+IEZvciBhIGZpcnN0IHBhdGNoLCBzdGVsbGFyIHdvcmshCgpJbmRlZWQu IFF1ZXVlZCBmb3IgLW5leHQsIHRoYW5rcyBmb3IgdGhlIHBhdGNoLgotRGFuaWVsCi0tIApEYW5p ZWwgVmV0dGVyClNvZnR3YXJlIEVuZ2luZWVyLCBJbnRlbCBDb3Jwb3JhdGlvbgpodHRwOi8vYmxv Zy5mZndsbC5jaApfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f XwpJbnRlbC1nZnggbWFpbGluZyBsaXN0CkludGVsLWdmeEBsaXN0cy5mcmVlZGVza3RvcC5vcmcK aHR0cDovL2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2ludGVsLWdmeAo=