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[2620:137:e000::1:20]) by mx.google.com with ESMTP id f15-20020a056402354f00b0043a90c70125si18401750edd.32.2022.07.18.07.51.21; Mon, 18 Jul 2022 07:51:45 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@163.com header.s=s110527 header.b=jk48i6p3; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=163.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231334AbiGROkl (ORCPT + 99 others); Mon, 18 Jul 2022 10:40:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35666 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229585AbiGROkk (ORCPT ); Mon, 18 Jul 2022 10:40:40 -0400 Received: from m1373.mail.163.com (m1373.mail.163.com [220.181.13.73]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id A77DD1F2F8; Mon, 18 Jul 2022 07:40:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=Date:From:Subject:MIME-Version:Message-ID; bh=34DID 9/3/C/yNi8IrBRnK49soxFVrG4+0TxfPot0gxs=; b=jk48i6p3vqnpUcH/vr+lV JRHcfM0nImzVMVBhOwuJSLc3SfccSJhFuBI5ff1KKyIxqiNUDHqM/eZRjzgVwvQE sJqbqkB2jlMpH55vv+LgkJ4DgfAdtJ3GmglWUOEoh2sjp1Fzae7j+DGVntKY2NEN ZrlDEiwlONJp/jHL7HhDWM= Received: from chen45464546$163.com ( [171.221.148.42] ) by ajax-webmail-wmsvr73 (Coremail) ; Mon, 18 Jul 2022 22:40:07 +0800 (CST) X-Originating-IP: [171.221.148.42] Date: Mon, 18 Jul 2022 22:40:07 +0800 (CST) From: "Chen Lin" To: "Maurizio Lombardi" Cc: "Alexander Duyck" , "Jakub Kicinski" , "Andrew Morton" , linux-mm , LKML , Netdev Subject: Re:Re: [PATCH V3] mm: prevent page_frag_alloc() from corrupting the memory X-Priority: 3 X-Mailer: Coremail Webmail Server Version XT5.0.13 build 20220113(9671e152) Copyright (c) 2002-2022 www.mailtech.cn 163com In-Reply-To: References: <20220715125013.247085-1-mlombard@redhat.com> <5a469c5a.8b85.1821171d9de.Coremail.chen45464546@163.com> Content-Transfer-Encoding: base64 Content-Type: text/plain; charset=GBK MIME-Version: 1.0 Message-ID: <22bf39a6.8f5e.18211c0898a.Coremail.chen45464546@163.com> X-Coremail-Locale: zh_CN X-CM-TRANSID: ScGowAAnXrTHcNViEehUAA--.4659W X-CM-SenderInfo: hfkh0kqvuwkkiuw6il2tof0z/xtbBdgdCnmDkn+vHVAAAsO X-Coremail-Antispam: 1U5529EdanIXcx71UUUUU7vcSsGvfC2KfnxnUU== X-Spam-Status: No, score=-1.4 required=5.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,FREEMAIL_ENVFROM_END_DIGIT,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org CkF0IDIwMjItMDctMTggMjE6NTA6NDEsICJNYXVyaXppbyBMb21iYXJkaSIgPG1sb21iYXJkQHJl ZGhhdC5jb20+IHdyb3RlOgo+cG8gMTguIDcuIDIwMjIgdiAxNToxNCBvZGVzqKpsYXRlbCBDaGVu IExpbiA8Y2hlbjQ1NDY0NTQ2QDE2My5jb20+IG5hcHNhbDoKPj4gLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLQo+PiBJZiB3ZSBjYW4gYWNjZXB0IGFkZGluZyBhIGJyYW5j aCB0byB0aGlzIHByb2Nlc3MsIHdoeSBub3QgYWRkIGl0IGF0IHRoZSBiZWdpbm5pbmcgbGlrZSBi ZWxvdz8KPj4gVGhlIGJlbG93IGNoYW5nZXMgYXJlIGFsc28gbW9yZSBpbiBsaW5lIHdpdGggdGhl IGRlZmluaXRpb24gb2YgInBhZ2UgZnJhZ21lbnQiLAo+PiB3aGljaCBpIG1lYW4gdGhlIGFib3Zl IGNoYW5nZXMgbWF5IG1ha2UgdGhlIGFsbG9jYXRpb24gb2YgbW9yZSB0aGFuIG9uZSBwYWdlIHN1 Y2Nlc3NmdWwuCj4+Cj4+IGluZGV4IDdhMjhmN2QuLjlkMDllYTUgMTAwNjQ0Cj4+IC0tLSBhL21t L3BhZ2VfYWxsb2MuYwo+PiArKysgYi9tbS9wYWdlX2FsbG9jLmMKPj4gQEAgLTU1NTEsNiArNTU1 MSw4IEBAIHZvaWQgKnBhZ2VfZnJhZ19hbGxvY19hbGlnbihzdHJ1Y3QgcGFnZV9mcmFnX2NhY2hl ICpuYywKPj4KPj4gICAgICAgICBvZmZzZXQgPSBuYy0+b2Zmc2V0IC0gZnJhZ3N6Owo+PiAgICAg ICAgIGlmICh1bmxpa2VseShvZmZzZXQgPCAwKSkgewo+PiArICAgICAgICAgICAgICAgaWYgKHVu bGlrZWx5KGZyYWdzeiA+IFBBR0VfU0laRSkpCj4+ICsgICAgICAgICAgICAgICAgICAgICAgIHJl dHVybiBOVUxMOwo+PiAgICAgICAgICAgICAgICAgcGFnZSA9IHZpcnRfdG9fcGFnZShuYy0+dmEp Owo+Pgo+PiAgICAgICAgICAgICAgICAgaWYgKCFwYWdlX3JlZl9zdWJfYW5kX3Rlc3QocGFnZSwg bmMtPnBhZ2VjbnRfYmlhcykpCj4+Cj4KPlRoaXMgd2lsbCBtYWtlICphbGwqIHBhZ2VfZnJhZ19h bGxvYygpIGNhbGxzIHdpdGggZnJhZ3N6ID4gUEFHRV9TSVpFCj5mYWlsLCBzbyBpdCB3aWxsCj5i YXNpY2FsbHkgYnJlYWsgYWxsIHRob3NlIGRyaXZlcnMgdGhhdCBhcmUgcmVseWluZyBvbiB0aGUg Y3VycmVudCBiZWhhdmlvdXIuCj5XaXRoIG15IHBhdGNoIGl0IHdpbGwgcmV0dXJuIE5VTEwgb25s eSBpZiB0aGUgY2FjaGUgaXNuJ3QgYmlnIGVub3VnaC4KPgo+TWF1cml6aW8uCgpCdXQgdGhlIG9y aWdpbmFsIGludGVudGlvbiBvZiBwYWdlIGZyYWcgaW50ZXJmYWNlIGlzIGluZGVlZCB0byBhbGxv Y2F0ZSBtZW1vcnkgCmxlc3MgdGhhbiBvbmUgcGFnZS4gSXQncyBub3QgYSBnb29kIGlkZWEgdG8g IGNvbXBsaWNhdGUgdGhlIGRlZmluaXRpb24gb2YgCiJwYWdlIGZyYWdtZW50Ii4KCkZ1cnRoZXJt b3JlLCB0aGUgcGF0Y2ggYWJvdmUgaXMgZWFzaWVyIHRvIHN5bmNocm9uaXplIHRvIGxvd2VyIHZl cnNpb25zLgo=