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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id z73sm9693620pfc.75.2020.10.08.22.41.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Oct 2020 22:41:15 -0700 (PDT) Date: Thu, 8 Oct 2020 22:41:14 -0700 From: Kees Cook To: YiFei Zhu Subject: Re: [PATCH v3 seccomp 2/5] seccomp/cache: Add "emulator" to check if filter is constant allow Message-ID: <202010082235.3D6A5F2@keescook> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Cc: Andrea Arcangeli , Giuseppe Scrivano , Valentin Rothberg , Jann Horn , YiFei Zhu , Linux Containers , Tobin Feldman-Fitzthum , kernel list , Andy Lutomirski , Hubertus Franke , David Laight , Jack Chen , Dimitrios Skarlatos , Josep Torrellas , Will Drewry , bpf , Tianyin Xu X-BeenThere: containers@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux Containers List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: containers-bounces@lists.linux-foundation.org Sender: "Containers" T24gVGh1LCBPY3QgMDgsIDIwMjAgYXQgMTE6NDc6MTdQTSAtMDUwMCwgWWlGZWkgWmh1IHdyb3Rl Ogo+IE9uIFdlZCwgU2VwIDMwLCAyMDIwIGF0IDEwOjIwIEFNIFlpRmVpIFpodSA8emh1eWlmZWkx OTk5QGdtYWlsLmNvbT4gd3JvdGU6Cj4gPiBAQCAtNTQ0LDcgKzU3Nyw4IEBAIHN0YXRpYyBzdHJ1 Y3Qgc2VjY29tcF9maWx0ZXIgKnNlY2NvbXBfcHJlcGFyZV9maWx0ZXIoc3RydWN0IHNvY2tfZnBy b2cgKmZwcm9nKQo+ID4gIHsKPiA+ICAgICAgICAgc3RydWN0IHNlY2NvbXBfZmlsdGVyICpzZmls dGVyOwo+ID4gICAgICAgICBpbnQgcmV0Owo+ID4gLSAgICAgICBjb25zdCBib29sIHNhdmVfb3Jp ZyA9IElTX0VOQUJMRUQoQ09ORklHX0NIRUNLUE9JTlRfUkVTVE9SRSk7Cj4gPiArICAgICAgIGNv bnN0IGJvb2wgc2F2ZV9vcmlnID0gSVNfRU5BQkxFRChDT05GSUdfQ0hFQ0tQT0lOVF9SRVNUT1JF KSB8fAo+ID4gKyAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIElTX0VOQUJMRUQoQ09ORklH X1NFQ0NPTVBfQ0FDSEVfTlJfT05MWSk7Cj4gPgo+ID4gICAgICAgICBpZiAoZnByb2ctPmxlbiA9 PSAwIHx8IGZwcm9nLT5sZW4gPiBCUEZfTUFYSU5TTlMpCj4gPiAgICAgICAgICAgICAgICAgcmV0 dXJuIEVSUl9QVFIoLUVJTlZBTCk7Cj4gCj4gSSdtIHRyeWluZyB0byB1c2UgX19pc19kZWZpbmVk KFNFQ0NPTVBfQVJDSF9OQVRJVkUpIGhlcmUsIGFuZCBnb3QgdGhpcyBtZXNzYWdlOgo+IAo+IGtl cm5lbC9zZWNjb21wLmM6IEluIGZ1bmN0aW9uIOKAmHNlY2NvbXBfcHJlcGFyZV9maWx0ZXLigJk6 Cj4gLi8uL2luY2x1ZGUvbGludXgva2NvbmZpZy5oOjQ0OjQ0OiBlcnJvcjogcGFzdGluZyAiX19B UkdfUExBQ0VIT0xERVJfIgo+IGFuZCAiKCIgZG9lcyBub3QgZ2l2ZSBhIHZhbGlkIHByZXByb2Nl c3NpbmcgdG9rZW4KPiAgICA0NCB8ICNkZWZpbmUgX19faXNfZGVmaW5lZCh2YWwpICBfX19faXNf ZGVmaW5lZChfX0FSR19QTEFDRUhPTERFUl8jI3ZhbCkKPiAgICAgICB8ICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgICBefn5+fn5+fn5+fn5+fn5+fn4KPiAuLy4vaW5j bHVkZS9saW51eC9rY29uZmlnLmg6NDM6Mjc6IG5vdGU6IGluIGV4cGFuc2lvbiBvZiBtYWNybyDi gJhfX19pc19kZWZpbmVk4oCZCj4gICAgNDMgfCAjZGVmaW5lIF9faXNfZGVmaW5lZCh4KSAgIF9f X2lzX2RlZmluZWQoeCkKPiAgICAgICB8ICAgICAgICAgICAgICAgICAgICAgICAgICAgXn5+fn5+ fn5+fn5+fgo+IGtlcm5lbC9zZWNjb21wLmM6NjI5OjExOiBub3RlOiBpbiBleHBhbnNpb24gb2Yg bWFjcm8g4oCYX19pc19kZWZpbmVk4oCZCj4gICA2MjkgfCAgICAgICAgICAgX19pc19kZWZpbmVk KFNFQ0NPTVBfQVJDSF9OQVRJVkUpOwo+ICAgICAgIHwgICAgICAgICAgIF5+fn5+fn5+fn5+fgo+ IAo+IExvb2tpbmcgYXQgdGhlIGltcGxlbWVudGF0aW9uIG9mIF9faXNfZGVmaW5lZCwgaXQgaXM6 Cj4gCj4gI2RlZmluZSBfX0FSR19QTEFDRUhPTERFUl8xIDAsCj4gI2RlZmluZSBfX3Rha2Vfc2Vj b25kX2FyZyhfX2lnbm9yZWQsIHZhbCwgLi4uKSB2YWwKPiAjZGVmaW5lIF9faXNfZGVmaW5lZCh4 KSBfX19pc19kZWZpbmVkKHgpCj4gI2RlZmluZSBfX19pc19kZWZpbmVkKHZhbCkgX19fX2lzX2Rl ZmluZWQoX19BUkdfUExBQ0VIT0xERVJfIyN2YWwpCj4gI2RlZmluZSBfX19faXNfZGVmaW5lZChh cmcxX29yX2p1bmspIF9fdGFrZV9zZWNvbmRfYXJnKGFyZzFfb3JfanVuayAxLCAwKQo+IAo+IEhl bmNlLCB3aGVuIEZPTyBpcyBkZWZpbmVkIHRvIGJlIDEsIHRoZW4gdGhlIGV4cGFuc2lvbiB3b3Vs ZCBiZQo+IF9faXNfZGVmaW5lZChGT08pIC0+IF9fX2lzX2RlZmluZWQoMSkgLT4KPiBfX19faXNf ZGVmaW5lZChfX0FSR19QTEFDRUhPTERFUl8xKSAtPiBfX3Rha2Vfc2Vjb25kX2FyZygwLCAxLCAw KSAtPgo+IDEsCj4gYW5kIHdoZW4gRk9PIGlzIG5vdCBkZWZpbmVkLCB0aGUgZXhwYW5zaW9uIHdv dWxkIGJlIF9faXNfZGVmaW5lZChGT08pCj4gLT4gX19faXNfZGVmaW5lZChGT08pIC0+IF9fX19p c19kZWZpbmVkKF9fQVJHX1BMQUNFSE9MREVSX0ZPTykgLT4KPiBfX3Rha2Vfc2Vjb25kX2FyZyhf X0FSR19QTEFDRUhPTERFUl9GT08gMSwgMCkgLT4gMAo+IAo+IEhvd2V2ZXIsIGhlcmUgU0VDQ09N UF9BUkNIX05BVElWRSBpcyBhbiBleHByZXNzaW9uIGZyb20gYW4gT1Igb2Ygc29tZQo+IGJpdHMs IGFuZCBfX2lzX2RlZmluZWQoU0VDQ09NUF9BUkNIX05BVElWRSkgd291bGQgbm90IGV4cGFuZCB0 bwo+IF9fQVJHX1BMQUNFSE9MREVSXzEgZHVyaW5nIGFueSBzdGFnZSBpbiB0aGUgcHJlcHJvY2Vz c2luZy4KPiAKPiBJcyB0aGVyZSBhbnkgYmV0dGVyIHdheSB0byBkbyB0aGlzPyBJJ20gdGhpbmtp bmcgb2YganVzdCBkb2luZyAjaWYKPiBkZWZpbmVkKENPTkZJR19DSEVDS1BPSU5UX1JFU1RPUkUp IHx8IGRlZmluZWQoU0VDQ09NUF9BUkNIX05BVElWRSkKPiBsaWtlIGluIEtlZSdzIHBhdGNoLgoK WWVhaCwgSSB0aGluayB0aGF0J3Mgc2ltcGxlc3QuCgotLSAKS2VlcyBDb29rCl9fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCkNvbnRhaW5lcnMgbWFpbGluZyBs aXN0CkNvbnRhaW5lcnNAbGlzdHMubGludXgtZm91bmRhdGlvbi5vcmcKaHR0cHM6Ly9saXN0cy5s aW51eGZvdW5kYXRpb24ub3JnL21haWxtYW4vbGlzdGluZm8vY29udGFpbmVycw==