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Tsirkin" To: "huangjie.albert" Subject: Re: [PATCH] virtio_ring : fix vring_packed_desc memory out of bounds bug Message-ID: <20220610103905-mutt-send-email-mst@kernel.org> References: <20220610103314.61577-1-huangjie.albert@bytedance.com> MIME-Version: 1.0 In-Reply-To: <20220610103314.61577-1-huangjie.albert@bytedance.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Cc: virtualization@lists.linux-foundation.org X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" T24gRnJpLCBKdW4gMTAsIDIwMjIgYXQgMDY6MzM6MTRQTSArMDgwMCwgaHVhbmdqaWUuYWxiZXJ0 IHdyb3RlOgo+IGtzb2Z0aXJxZCBtYXkgY29uc3VtZSB0aGUgcGFja2V0IGFuZCBpdCB3aWxsIGNh bGw6Cj4gdmlydG5ldF9wb2xsCj4gCS0tPnZpcnRuZXRfcmVjZWl2ZQo+IAkJLS0+dmlydHF1ZXVl X2dldF9idWZfY3R4Cj4gCQkJLS0+dmlydHF1ZXVlX2dldF9idWZfY3R4X3BhY2tlZAo+IGFuZCBp biB2aXJ0cXVldWVfZ2V0X2J1Zl9jdHhfcGFja2VkOgo+IAo+IHZxLT5sYXN0X3VzZWRfaWR4ICs9 IHZxLT5wYWNrZWQuZGVzY19zdGF0ZVtpZF0ubnVtOwo+IGlmICh1bmxpa2VseSh2cS0+bGFzdF91 c2VkX2lkeCA+PSB2cS0+cGFja2VkLnZyaW5nLm51bSkpIHsKPiAgICAgICAgICB2cS0+bGFzdF91 c2VkX2lkeCAtPSB2cS0+cGFja2VkLnZyaW5nLm51bTsKPiAgICAgICAgICB2cS0+cGFja2VkLnVz ZWRfd3JhcF9jb3VudGVyIF49IDE7Cj4gfQo+IAo+IGlmIGF0IHRoZSBzYW1lIHRpbWUsIHRoZXJl IGNvbWVzIGEgdnJpbmcgaW50ZXJydXB077yMaW4gdnJpbmdfaW50ZXJydXB0Ogo+IHdlIHdpbGwg Y2FsbDoKPiB2cmluZ19pbnRlcnJ1cHQKPiAJLS0+bW9yZV91c2VkCj4gCQktLT5tb3JlX3VzZWRf cGFja2VkCj4gCQkJLS0+aXNfdXNlZF9kZXNjX3BhY2tlZAo+IGluIGlzX3VzZWRfZGVzY19wYWNr ZWQsIHRoZSBsYXN0X3VzZWRfaWR4IG1heWJlID49IHZxLT5wYWNrZWQudnJpbmcubnVtLgo+IHNv IHRoaXMgY291bGQgY2FzZSBhIG1lbW9yeSBvdXQgb2YgYm91bmRzIGJ1Zy4KPiAKPiB0aGlzIHBh dGNoIGlzIHRvIGZpeCB0aGlzLgo+IAo+IFNpZ25lZC1vZmYtYnk6IGh1YW5namllLmFsYmVydCA8 aHVhbmdqaWUuYWxiZXJ0QGJ5dGVkYW5jZS5jb20+CgoKVGhpcyBwYXR0ZXJuIHdhcyBhbHdheXMg aWZmeSwgYnV0IEkgZG9uJ3QgdGhpbmsgdGhlIHBhdGNoCmltcHJvdmVzIHRoZSBzaXR1YXRpb24g bXVjaC4gbGFzdF91c2VkX2lkeCBhbmQgdnEtPnBhY2tlZC51c2VkX3dyYXBfY291bnRlciAKY2Fu IHN0aWxsIGdldCBvdXQgb2Ygc3luYy4KCk1heWJlIHJlZmFjdG9yIGNvZGUgdG8ga2VlcCBldmVy eXRoaW5nIGluIHZxLT5sYXN0X3VzZWRfaWR4PwoKSmFzb24gd2hhdCBpcyB5b3VyIHRha2U/CgoK CgoKPiAtLS0KPiAgZHJpdmVycy92aXJ0aW8vdmlydGlvX3JpbmcuYyB8IDMgKysrCj4gIDEgZmls ZSBjaGFuZ2VkLCAzIGluc2VydGlvbnMoKykKPiAKPiBkaWZmIC0tZ2l0IGEvZHJpdmVycy92aXJ0 aW8vdmlydGlvX3JpbmcuYyBiL2RyaXZlcnMvdmlydGlvL3ZpcnRpb19yaW5nLmMKPiBpbmRleCAx M2E3MzQ4Y2VkZmYuLmQyYWJiYjNhODE4NyAxMDA2NDQKPiAtLS0gYS9kcml2ZXJzL3ZpcnRpby92 aXJ0aW9fcmluZy5jCj4gKysrIGIvZHJpdmVycy92aXJ0aW8vdmlydGlvX3JpbmcuYwo+IEBAIC0x Mzk3LDYgKzEzOTcsOSBAQCBzdGF0aWMgaW5saW5lIGJvb2wgaXNfdXNlZF9kZXNjX3BhY2tlZChj b25zdCBzdHJ1Y3QgdnJpbmdfdmlydHF1ZXVlICp2cSwKPiAgCWJvb2wgYXZhaWwsIHVzZWQ7Cj4g IAl1MTYgZmxhZ3M7Cj4gIAo+ICsJaWYgKGlkeCA+PSB2cS0+cGFja2VkLnZyaW5nLm51bSkKPiAr CQlyZXR1cm4gZmFsc2U7Cj4gKwo+ICAJZmxhZ3MgPSBsZTE2X3RvX2NwdSh2cS0+cGFja2VkLnZy aW5nLmRlc2NbaWR4XS5mbGFncyk7Cj4gIAlhdmFpbCA9ICEhKGZsYWdzICYgKDEgPDwgVlJJTkdf UEFDS0VEX0RFU0NfRl9BVkFJTCkpOwo+ICAJdXNlZCA9ICEhKGZsYWdzICYgKDEgPDwgVlJJTkdf UEFDS0VEX0RFU0NfRl9VU0VEKSk7Cj4gLS0gCj4gMi4yNy4wCgpfX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fXwpWaXJ0dWFsaXphdGlvbiBtYWlsaW5nIGxpc3QK VmlydHVhbGl6YXRpb25AbGlzdHMubGludXgtZm91bmRhdGlvbi5vcmcKaHR0cHM6Ly9saXN0cy5s aW51eGZvdW5kYXRpb24ub3JnL21haWxtYW4vbGlzdGluZm8vdmlydHVhbGl6YXRpb24=