From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oleksandr Andrushchenko Subject: Re: [PATCH 2/6] xen-netfront: copy response out of shared buffer before accessing it Date: Wed, 2 May 2018 08:20:56 +0300 Message-ID: References: <98a855dceb47dbebd9c87e024084f14a5cb127f7.1525122026.git-series.marmarek@invisiblethingslab.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1fDkCN-0003eF-3S for xen-devel@lists.xenproject.org; Wed, 02 May 2018 05:21:03 +0000 Received: by mail-lf0-x241.google.com with SMTP id j16-v6so18992961lfb.7 for ; Tue, 01 May 2018 22:21:00 -0700 (PDT) In-Reply-To: <98a855dceb47dbebd9c87e024084f14a5cb127f7.1525122026.git-series.marmarek@invisiblethingslab.com> Content-Language: en-US List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: =?UTF-8?Q?Marek_Marczykowski-G=c3=b3recki?= , xen-devel@lists.xenproject.org Cc: Juergen Gross , "open list:NETWORKING DRIVERS" , Boris Ostrovsky , open list , stable@vger.kernel.org List-Id: xen-devel@lists.xenproject.org T24gMDUvMDEvMjAxOCAxMjowMSBBTSwgTWFyZWsgTWFyY3p5a293c2tpLUfDs3JlY2tpIHdyb3Rl Ogo+IE1ha2UgbG9jYWwgY29weSBvZiB0aGUgcmVzcG9uc2UsIG90aGVyd2lzZSBiYWNrZW5kIG1p Z2h0IG1vZGlmeSBpdCB3aGlsZQo+IGZyb250ZW5kIGlzIGFscmVhZHkgcHJvY2Vzc2luZyBpdCAt IGxlYWRpbmcgdG8gdGltZSBvZiBjaGVjayAvIHRpbWUgb2YKPiB1c2UgaXNzdWUuCj4KPiBUaGlz IGlzIGNvbXBsZW1lbnRhcnkgdG8gWFNBMTU1Lgo+Cj4gQ2M6IHN0YWJsZUB2Z2VyLmtlcm5lbC5v cmcKPiBTaWduZWQtb2ZmLWJ5OiBNYXJlayBNYXJjenlrb3dza2ktR8OzcmVja2kgPG1hcm1hcmVr QGludmlzaWJsZXRoaW5nc2xhYi5jb20+Cj4gLS0tCj4gICBkcml2ZXJzL25ldC94ZW4tbmV0ZnJv bnQuYyB8IDUxICsrKysrKysrKysrKysrKysrKystLS0tLS0tLS0tLS0tLS0tLS0tLQo+ICAgMSBm aWxlIGNoYW5nZWQsIDI1IGluc2VydGlvbnMoKyksIDI2IGRlbGV0aW9ucygtKQo+Cj4gZGlmZiAt LWdpdCBhL2RyaXZlcnMvbmV0L3hlbi1uZXRmcm9udC5jIGIvZHJpdmVycy9uZXQveGVuLW5ldGZy b250LmMKPiBpbmRleCA0ZGQwNjY4Li5kYzk5NzYzIDEwMDY0NAo+IC0tLSBhL2RyaXZlcnMvbmV0 L3hlbi1uZXRmcm9udC5jCj4gKysrIGIvZHJpdmVycy9uZXQveGVuLW5ldGZyb250LmMKPiBAQCAt Mzg3LDEzICszODcsMTMgQEAgc3RhdGljIHZvaWQgeGVubmV0X3R4X2J1Zl9nYyhzdHJ1Y3QgbmV0 ZnJvbnRfcXVldWUgKnF1ZXVlKQo+ICAgCQlybWIoKTsgLyogRW5zdXJlIHdlIHNlZSByZXNwb25z ZXMgdXAgdG8gJ3JwJy4gKi8KPiAgIAo+ICAgCQlmb3IgKGNvbnMgPSBxdWV1ZS0+dHgucnNwX2Nv bnM7IGNvbnMgIT0gcHJvZDsgY29ucysrKSB7ClNpZGUgY29tbWVudDogdGhlIG9yaWdpbmFsIGNv bmNlcm4gd2FzIGV4cHJlc3NlZCBvbiB0aGUgYWJvdmUgY291bnRlcnMsCndpbGwgdGhvc2UgYmUg YWRkcmVzc2VkIGFzIGEgZGVkaWNhdGVkIHNlcmllcz8KPiAtCQkJc3RydWN0IHhlbl9uZXRpZl90 eF9yZXNwb25zZSAqdHhyc3A7Cj4gKwkJCXN0cnVjdCB4ZW5fbmV0aWZfdHhfcmVzcG9uc2UgdHhy c3A7Cj4gICAKPiAtCQkJdHhyc3AgPSBSSU5HX0dFVF9SRVNQT05TRSgmcXVldWUtPnR4LCBjb25z KTsKPiAtCQkJaWYgKHR4cnNwLT5zdGF0dXMgPT0gWEVOX05FVElGX1JTUF9OVUxMKQo+ICsJCQlS SU5HX0NPUFlfUkVTUE9OU0UoJnF1ZXVlLT50eCwgY29ucywgJnR4cnNwKTsKPiArCQkJaWYgKHR4 cnNwLnN0YXR1cyA9PSBYRU5fTkVUSUZfUlNQX05VTEwpCj4gICAJCQkJY29udGludWU7Cj4gICAK SU1PLCB0aGVyZSBpcyBzdGlsbCBubyBndWFyYW50ZWUgeW91IGFjY2VzcyBjb25zaXN0ZW50IGRh dGEgYWZ0ZXIgdGhpcyAKY2hhbmdlLgpXaGF0IGlmIHBhcnQgb2YgdGhlIHJlc3BvbnNlIHdhcyBv ayB3aGVuIHlvdSBzdGFydGVkIGNvcHlpbmcgYW5kCnRoZW4sIGluIHRoZSBtaWRkbGUsIGJhY2tl bmQgcG9pc29ucyB0aGUgZW5kIG9mIHRoZSByZXNwb25zZT8KVGhpcyBzZWVtcyB0byBiZSBqdXN0 IGxpa2UgbWluaW1pemluZyg/KSBjaGFuY2VzIHRvIHdvcmsgd2l0aCBpbmNvbnNpc3RlbnQKZGF0 YSByYXRoZXIgdGhhbiByZW1vdmluZyB0aGUgcG9zc2liaWxpdHkgb2Ygc3VjaCBjb21wbGV0ZWx5 Cj4gLQkJCWlkICA9IHR4cnNwLT5pZDsKPiArCQkJaWQgID0gdHhyc3AuaWQ7Cj4gICAJCQlza2Ig PSBxdWV1ZS0+dHhfc2tic1tpZF0uc2tiOwo+ICAgCQkJaWYgKHVubGlrZWx5KGdudHRhYl9xdWVy eV9mb3JlaWduX2FjY2VzcygKPiAgIAkJCQlxdWV1ZS0+Z3JhbnRfdHhfcmVmW2lkXSkgIT0gMCkp IHsKPiBAQCAtNzQxLDcgKzc0MSw3IEBAIHN0YXRpYyBpbnQgeGVubmV0X2dldF9leHRyYXMoc3Ry dWN0IG5ldGZyb250X3F1ZXVlICpxdWV1ZSwKPiAgIAkJCSAgICAgUklOR19JRFggcnApCj4gICAK PiAgIHsKPiAtCXN0cnVjdCB4ZW5fbmV0aWZfZXh0cmFfaW5mbyAqZXh0cmE7Cj4gKwlzdHJ1Y3Qg eGVuX25ldGlmX2V4dHJhX2luZm8gZXh0cmE7Cj4gICAJc3RydWN0IGRldmljZSAqZGV2ID0gJnF1 ZXVlLT5pbmZvLT5uZXRkZXYtPmRldjsKPiAgIAlSSU5HX0lEWCBjb25zID0gcXVldWUtPnJ4LnJz cF9jb25zOwo+ICAgCWludCBlcnIgPSAwOwo+IEBAIC03NTcsMjQgKzc1NywyMyBAQCBzdGF0aWMg aW50IHhlbm5ldF9nZXRfZXh0cmFzKHN0cnVjdCBuZXRmcm9udF9xdWV1ZSAqcXVldWUsCj4gICAJ CQlicmVhazsKPiAgIAkJfQo+ICAgCj4gLQkJZXh0cmEgPSAoc3RydWN0IHhlbl9uZXRpZl9leHRy YV9pbmZvICopCj4gLQkJCVJJTkdfR0VUX1JFU1BPTlNFKCZxdWV1ZS0+cngsICsrY29ucyk7Cj4g KwkJUklOR19DT1BZX1JFU1BPTlNFKCZxdWV1ZS0+cngsICsrY29ucywgJmV4dHJhKTsKPiAgIAo+ IC0JCWlmICh1bmxpa2VseSghZXh0cmEtPnR5cGUgfHwKPiAtCQkJICAgICBleHRyYS0+dHlwZSA+ PSBYRU5fTkVUSUZfRVhUUkFfVFlQRV9NQVgpKSB7Cj4gKwkJaWYgKHVubGlrZWx5KCFleHRyYS50 eXBlIHx8Cj4gKwkJCSAgICAgZXh0cmEudHlwZSA+PSBYRU5fTkVUSUZfRVhUUkFfVFlQRV9NQVgp KSB7Cj4gICAJCQlpZiAobmV0X3JhdGVsaW1pdCgpKQo+ICAgCQkJCWRldl93YXJuKGRldiwgIklu dmFsaWQgZXh0cmEgdHlwZTogJWRcbiIsCj4gLQkJCQkJZXh0cmEtPnR5cGUpOwo+ICsJCQkJCWV4 dHJhLnR5cGUpOwo+ICAgCQkJZXJyID0gLUVJTlZBTDsKPiAgIAkJfSBlbHNlIHsKPiAtCQkJbWVt Y3B5KCZleHRyYXNbZXh0cmEtPnR5cGUgLSAxXSwgZXh0cmEsCj4gLQkJCSAgICAgICBzaXplb2Yo KmV4dHJhKSk7Cj4gKwkJCW1lbWNweSgmZXh0cmFzW2V4dHJhLnR5cGUgLSAxXSwgJmV4dHJhLAo+ ICsJCQkgICAgICAgc2l6ZW9mKGV4dHJhKSk7Cj4gICAJCX0KPiAgIAo+ICAgCQlza2IgPSB4ZW5u ZXRfZ2V0X3J4X3NrYihxdWV1ZSwgY29ucyk7Cj4gICAJCXJlZiA9IHhlbm5ldF9nZXRfcnhfcmVm KHF1ZXVlLCBjb25zKTsKPiAgIAkJeGVubmV0X21vdmVfcnhfc2xvdChxdWV1ZSwgc2tiLCByZWYp Owo+IC0JfSB3aGlsZSAoZXh0cmEtPmZsYWdzICYgWEVOX05FVElGX0VYVFJBX0ZMQUdfTU9SRSk7 Cj4gKwl9IHdoaWxlIChleHRyYS5mbGFncyAmIFhFTl9ORVRJRl9FWFRSQV9GTEFHX01PUkUpOwo+ ICAgCj4gICAJcXVldWUtPnJ4LnJzcF9jb25zID0gY29uczsKPiAgIAlyZXR1cm4gZXJyOwo+IEBA IC03ODQsMjggKzc4MywyOCBAQCBzdGF0aWMgaW50IHhlbm5ldF9nZXRfcmVzcG9uc2VzKHN0cnVj dCBuZXRmcm9udF9xdWV1ZSAqcXVldWUsCj4gICAJCQkJc3RydWN0IG5ldGZyb250X3J4X2luZm8g KnJpbmZvLCBSSU5HX0lEWCBycCwKPiAgIAkJCQlzdHJ1Y3Qgc2tfYnVmZl9oZWFkICpsaXN0KQo+ ICAgewo+IC0Jc3RydWN0IHhlbl9uZXRpZl9yeF9yZXNwb25zZSAqcnggPSAmcmluZm8tPnJ4Owo+ ICsJc3RydWN0IHhlbl9uZXRpZl9yeF9yZXNwb25zZSByeCA9IHJpbmZvLT5yeDsKPiAgIAlzdHJ1 Y3QgeGVuX25ldGlmX2V4dHJhX2luZm8gKmV4dHJhcyA9IHJpbmZvLT5leHRyYXM7Cj4gICAJc3Ry dWN0IGRldmljZSAqZGV2ID0gJnF1ZXVlLT5pbmZvLT5uZXRkZXYtPmRldjsKPiAgIAlSSU5HX0lE WCBjb25zID0gcXVldWUtPnJ4LnJzcF9jb25zOwo+ICAgCXN0cnVjdCBza19idWZmICpza2IgPSB4 ZW5uZXRfZ2V0X3J4X3NrYihxdWV1ZSwgY29ucyk7Cj4gICAJZ3JhbnRfcmVmX3QgcmVmID0geGVu bmV0X2dldF9yeF9yZWYocXVldWUsIGNvbnMpOwo+IC0JaW50IG1heCA9IE1BWF9TS0JfRlJBR1Mg KyAocngtPnN0YXR1cyA8PSBSWF9DT1BZX1RIUkVTSE9MRCk7Cj4gKwlpbnQgbWF4ID0gTUFYX1NL Ql9GUkFHUyArIChyeC5zdGF0dXMgPD0gUlhfQ09QWV9USFJFU0hPTEQpOwo+ICAgCWludCBzbG90 cyA9IDE7Cj4gICAJaW50IGVyciA9IDA7Cj4gICAJdW5zaWduZWQgbG9uZyByZXQ7Cj4gICAKPiAt CWlmIChyeC0+ZmxhZ3MgJiBYRU5fTkVUUlhGX2V4dHJhX2luZm8pIHsKPiArCWlmIChyeC5mbGFn cyAmIFhFTl9ORVRSWEZfZXh0cmFfaW5mbykgewo+ICAgCQllcnIgPSB4ZW5uZXRfZ2V0X2V4dHJh cyhxdWV1ZSwgZXh0cmFzLCBycCk7Cj4gICAJCWNvbnMgPSBxdWV1ZS0+cngucnNwX2NvbnM7Cj4g ICAJfQo+ICAgCj4gICAJZm9yICg7Oykgewo+IC0JCWlmICh1bmxpa2VseShyeC0+c3RhdHVzIDwg MCB8fAo+IC0JCQkgICAgIHJ4LT5vZmZzZXQgKyByeC0+c3RhdHVzID4gWEVOX1BBR0VfU0laRSkp IHsKPiArCQlpZiAodW5saWtlbHkocnguc3RhdHVzIDwgMCB8fAo+ICsJCQkgICAgIHJ4Lm9mZnNl dCArIHJ4LnN0YXR1cyA+IFhFTl9QQUdFX1NJWkUpKSB7Cj4gICAJCQlpZiAobmV0X3JhdGVsaW1p dCgpKQo+ICAgCQkJCWRldl93YXJuKGRldiwgInJ4LT5vZmZzZXQ6ICV1LCBzaXplOiAlZFxuIiwK PiAtCQkJCQkgcngtPm9mZnNldCwgcngtPnN0YXR1cyk7Cj4gKwkJCQkJIHJ4Lm9mZnNldCwgcngu c3RhdHVzKTsKPiAgIAkJCXhlbm5ldF9tb3ZlX3J4X3Nsb3QocXVldWUsIHNrYiwgcmVmKTsKPiAg IAkJCWVyciA9IC1FSU5WQUw7Cj4gICAJCQlnb3RvIG5leHQ7Cj4gQEAgLTgxOSw3ICs4MTgsNyBA QCBzdGF0aWMgaW50IHhlbm5ldF9nZXRfcmVzcG9uc2VzKHN0cnVjdCBuZXRmcm9udF9xdWV1ZSAq cXVldWUsCj4gICAJCWlmIChyZWYgPT0gR1JBTlRfSU5WQUxJRF9SRUYpIHsKPiAgIAkJCWlmIChu ZXRfcmF0ZWxpbWl0KCkpCj4gICAJCQkJZGV2X3dhcm4oZGV2LCAiQmFkIHJ4IHJlc3BvbnNlIGlk ICVkLlxuIiwKPiAtCQkJCQkgcngtPmlkKTsKPiArCQkJCQkgcnguaWQpOwo+ICAgCQkJZXJyID0g LUVJTlZBTDsKPiAgIAkJCWdvdG8gbmV4dDsKPiAgIAkJfQo+IEBAIC04MzIsNyArODMxLDcgQEAg c3RhdGljIGludCB4ZW5uZXRfZ2V0X3Jlc3BvbnNlcyhzdHJ1Y3QgbmV0ZnJvbnRfcXVldWUgKnF1 ZXVlLAo+ICAgCQlfX3NrYl9xdWV1ZV90YWlsKGxpc3QsIHNrYik7Cj4gICAKPiAgIG5leHQ6Cj4g LQkJaWYgKCEocngtPmZsYWdzICYgWEVOX05FVFJYRl9tb3JlX2RhdGEpKQo+ICsJCWlmICghKHJ4 LmZsYWdzICYgWEVOX05FVFJYRl9tb3JlX2RhdGEpKQo+ICAgCQkJYnJlYWs7Cj4gICAKPiAgIAkJ aWYgKGNvbnMgKyBzbG90cyA9PSBycCkgewo+IEBAIC04NDIsNyArODQxLDcgQEAgc3RhdGljIGlu dCB4ZW5uZXRfZ2V0X3Jlc3BvbnNlcyhzdHJ1Y3QgbmV0ZnJvbnRfcXVldWUgKnF1ZXVlLAo+ICAg CQkJYnJlYWs7Cj4gICAJCX0KPiAgIAo+IC0JCXJ4ID0gUklOR19HRVRfUkVTUE9OU0UoJnF1ZXVl LT5yeCwgY29ucyArIHNsb3RzKTsKPiArCQlSSU5HX0NPUFlfUkVTUE9OU0UoJnF1ZXVlLT5yeCwg Y29ucyArIHNsb3RzLCAmcngpOwo+ICAgCQlza2IgPSB4ZW5uZXRfZ2V0X3J4X3NrYihxdWV1ZSwg Y29ucyArIHNsb3RzKTsKPiAgIAkJcmVmID0geGVubmV0X2dldF9yeF9yZWYocXVldWUsIGNvbnMg KyBzbG90cyk7Cj4gICAJCXNsb3RzKys7Cj4gQEAgLTg5OCw5ICs4OTcsOSBAQCBzdGF0aWMgUklO R19JRFggeGVubmV0X2ZpbGxfZnJhZ3Moc3RydWN0IG5ldGZyb250X3F1ZXVlICpxdWV1ZSwKPiAg IAlzdHJ1Y3Qgc2tfYnVmZiAqbnNrYjsKPiAgIAo+ICAgCXdoaWxlICgobnNrYiA9IF9fc2tiX2Rl cXVldWUobGlzdCkpKSB7Cj4gLQkJc3RydWN0IHhlbl9uZXRpZl9yeF9yZXNwb25zZSAqcnggPQo+ IC0JCQlSSU5HX0dFVF9SRVNQT05TRSgmcXVldWUtPnJ4LCArK2NvbnMpOwo+ICsJCXN0cnVjdCB4 ZW5fbmV0aWZfcnhfcmVzcG9uc2Ugcng7Cj4gICAJCXNrYl9mcmFnX3QgKm5mcmFnID0gJnNrYl9z aGluZm8obnNrYiktPmZyYWdzWzBdOwo+ICsJCVJJTkdfQ09QWV9SRVNQT05TRSgmcXVldWUtPnJ4 LCArK2NvbnMsICZyeCk7Cj4gICAKPiAgIAkJaWYgKHNoaW5mby0+bnJfZnJhZ3MgPT0gTUFYX1NL Ql9GUkFHUykgewo+ICAgCQkJdW5zaWduZWQgaW50IHB1bGxfdG8gPSBORVRGUk9OVF9TS0JfQ0Io c2tiKS0+cHVsbF90bzsKPiBAQCAtOTExLDcgKzkxMCw3IEBAIHN0YXRpYyBSSU5HX0lEWCB4ZW5u ZXRfZmlsbF9mcmFncyhzdHJ1Y3QgbmV0ZnJvbnRfcXVldWUgKnF1ZXVlLAo+ICAgCQlCVUdfT04o c2hpbmZvLT5ucl9mcmFncyA+PSBNQVhfU0tCX0ZSQUdTKTsKPiAgIAo+ICAgCQlza2JfYWRkX3J4 X2ZyYWcoc2tiLCBzaGluZm8tPm5yX2ZyYWdzLCBza2JfZnJhZ19wYWdlKG5mcmFnKSwKPiAtCQkJ CXJ4LT5vZmZzZXQsIHJ4LT5zdGF0dXMsIFBBR0VfU0laRSk7Cj4gKwkJCQlyeC5vZmZzZXQsIHJ4 LnN0YXR1cywgUEFHRV9TSVpFKTsKPiAgIAo+ICAgCQlza2Jfc2hpbmZvKG5za2IpLT5ucl9mcmFn cyA9IDA7Cj4gICAJCWtmcmVlX3NrYihuc2tiKTsKPiBAQCAtMTAwNyw3ICsxMDA2LDcgQEAgc3Rh dGljIGludCB4ZW5uZXRfcG9sbChzdHJ1Y3QgbmFwaV9zdHJ1Y3QgKm5hcGksIGludCBidWRnZXQp Cj4gICAJaSA9IHF1ZXVlLT5yeC5yc3BfY29uczsKPiAgIAl3b3JrX2RvbmUgPSAwOwo+ICAgCXdo aWxlICgoaSAhPSBycCkgJiYgKHdvcmtfZG9uZSA8IGJ1ZGdldCkpIHsKPiAtCQltZW1jcHkocngs IFJJTkdfR0VUX1JFU1BPTlNFKCZxdWV1ZS0+cngsIGkpLCBzaXplb2YoKnJ4KSk7Cj4gKwkJUklO R19DT1BZX1JFU1BPTlNFKCZxdWV1ZS0+cngsIGksIHJ4KTsKPiAgIAkJbWVtc2V0KGV4dHJhcywg MCwgc2l6ZW9mKHJpbmZvLmV4dHJhcykpOwo+ICAgCj4gICAJCWVyciA9IHhlbm5ldF9nZXRfcmVz cG9uc2VzKHF1ZXVlLCAmcmluZm8sIHJwLCAmdG1wcSk7CgoKX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLWRldmVsIG1haWxpbmcgbGlzdApYZW4tZGV2 ZWxAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0cy54ZW5wcm9qZWN0Lm9yZy9tYWls bWFuL2xpc3RpbmZvL3hlbi1kZXZlbA==