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([2601:282:800:7ed0:bd1d:fe8d:d220:8378]) by smtp.googlemail.com with ESMTPSA id y5-20020a92d805000000b0033b2a123254sm147546ilm.61.2023.07.26.17.27.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Jul 2023 17:27:13 -0700 (PDT) Message-ID: <0c06b067-349c-9fe2-2cc3-36c149fd5277@gmail.com> Date: Wed, 26 Jul 2023 18:27:12 -0600 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH v3] drivers: net: prevent tun_get_user() to exceed xdp size limits Content-Language: en-US From: David Ahern To: Jesper Dangaard Brouer , Jason Wang , Andrew Kanner References: <20230725155403.796-1-andrew.kanner@gmail.com> <179979e6-eb8a-0300-5445-999b9366250a@gmail.com> In-Reply-To: <179979e6-eb8a-0300-5445-999b9366250a@gmail.com> Cc: syzbot+f817490f5bd20541b90a@syzkaller.appspotmail.com, netdev@vger.kernel.org, John Fastabend , linux-kernel@vger.kernel.org, edumazet@google.com, brouer@redhat.com, kuba@kernel.org, pabeni@redhat.com, linux-kernel-mentees@lists.linuxfoundation.org, davem@davemloft.net X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" T24gNy8yNi8yMyAxOjM3IFBNLCBEYXZpZCBBaGVybiB3cm90ZToKPiBPbiA3LzI2LzIzIDM6MDIg QU0sIEplc3BlciBEYW5nYWFyZCBCcm91ZXIgd3JvdGU6Cj4+IENjLiBKb2huIGFuZCBBaGVybgo+ Pgo+PiBPbiAyNi8wNy8yMDIzIDA0LjA5LCBKYXNvbiBXYW5nIHdyb3RlOgo+Pj4gT24gVHVlLCBK dWwgMjUsIDIwMjMgYXQgMTE6NTTigK9QTSBBbmRyZXcgS2FubmVyCj4+PiA8YW5kcmV3Lmthbm5l ckBnbWFpbC5jb20+IHdyb3RlOgo+Pj4+Cj4+Pj4gU3l6a2FsbGVyIHJlcG9ydGVkIHRoZSBmb2xs b3dpbmcgaXNzdWU6Cj4+Pj4gPT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 Cj4+Pj4gVG9vIEJJRyB4ZHAtPmZyYW1lX3N6ID0gMTMxMDcyCj4+Cj4+IElzIHRoaXMgYSBjb250 aWd1b3VzIHBoeXNpY2FsIG1lbW9yeSBhbGxvY2F0aW9uPwo+Pgo+PiAxMzEwNzIgYnl0ZXMgZXF1 YWwgb3JkZXIgNSBwYWdlLgo+Pgo+PiBMb29raW5nIGF0IHR1bi5jIGNvZGUgSSBjYW5ub3QgZmlu ZCBhIGNvZGUgcGF0aCB0aGF0IGNvdWxkIGNyZWF0ZQo+PiBvcmRlci01IHNrYi0+ZGF0YSwgYnV0 IG9ubHkgU0tCIHdpdGggb3JkZXItMCBmcmFnbWVudHMuwqAgQnV0IEkgZ3Vlc3MgaXQKPj4gaXMg dGhlIG5ldGlmX3JlY2VpdmVfZ2VuZXJpY194ZHAoKSB3aGF0IHdpbGwgcmVhbGxvYyB0byBtYWtl IHRoaXMgbGluZWFyCj4+ICh2aWEgc2tiX2xpbmVhcml6ZSgpKQo+IAo+IAo+IGdldF90dW5fdXNl ciBpcyBwYXNzZWQgYW4gaW92X2l0ZXIgd2l0aCBhIHNpbmdsZSBzZWdtZW50IG9mIDY1MDA3Cj4g dG90YWxfbGVuLiBUaGUgYWxsb2Nfc2tiIHBhdGggaXMgaGl0IHdpdGggYW4gYWxpZ24gc2l6ZSBv ZiBvbmx5IDY0LiBUaGF0Cj4gaXMgaW5zdWZmaWNpZW50IGZvciBYRFAgc28gdGhlIG5ldGlmX3Jl Y2VpdmVfZ2VuZXJpY194ZHAgaGl0cyB0aGUKPiBwc2tiX2V4cGFuZF9oZWFkIHBhdGguIFNvbWV0 aGluZyBpcyBvZmYgaW4gdGhlIG1hdGggaW4KPiBuZXRpZl9yZWNlaXZlX2dlbmVyaWNfeGRwIHJl c3VsdGluZyBpbiB0aGUgc2tiIG1hcmtlcnMgYmVpbmcgb2ZmLiBUaGF0Cj4gY2F1c2VzIGJwZl9w cm9nX3J1bl9nZW5lcmljX3hkcCB0byBjb21wdXRlIHRoZSB3cm9uZyBmcmFtZV9zei4KCgpCVFcs IGl0IGlzIHBza2JfZXhwYW5kX2hlYWQgdGhhdCB0dXJucyBpdCBmcm9tIGEgNjRrQiB0byBhIDEy OCBrQgphbGxvY2F0aW9uLiBCdXQgdGhlIDEyOGtCIHBhcnQgaXMgbm90IHJlbGV2YW50IHRvIHRo ZSAiYnVnIiBoZXJlIHJlYWxseS4KClRoZSB3YXJuIG9uIGdldHRpbmcgdHJpcHBlZCBpbiBicGZf eGRwX2FkanVzdF90YWlsIGlzIGJlY2F1c2UgeGRwCmdlbmVyaWMgcGF0aCBpcyBza2IgYmFzZWQg YW5kIGNhbiBoYXZlIGEgZnJhbWVfc3ogPiA0a0IuIFRoYXQncyB3aGF0IHRoZQpzcGxhdCBpcyBh Ym91dC4KClBlcmhhcHMgdGhlIHNvbHV0aW9uIGlzIHRvIHJlbW92ZSB0aGUgV0FSTl9PTi4KCgpf X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpMaW51eC1rZXJu ZWwtbWVudGVlcyBtYWlsaW5nIGxpc3QKTGludXgta2VybmVsLW1lbnRlZXNAbGlzdHMubGludXhm b3VuZGF0aW9uLm9yZwpodHRwczovL2xpc3RzLmxpbnV4Zm91bmRhdGlvbi5vcmcvbWFpbG1hbi9s aXN0aW5mby9saW51eC1rZXJuZWwtbWVudGVlcwo=