From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f47.google.com (mail-pj1-f47.google.com [209.85.216.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D047931F99D for ; Thu, 25 Jun 2026 18:35:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.47 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782412551; cv=none; b=TXodcb/QNr8DBbhHwegKIasVFrK5AUQ1Fqwnp1G7X6r7t0+0vR2azPpn/tbMcaJQhCJF2DTDx6a9qOKSylIzi0+DwxybSwAnzVA29kRzBl/ZY79muUdgTpcF9f3NPkeJQ7p9O3OGB5O3/Cq2h43KGt6GHXbMg6t2LAvi1eU8fKo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782412551; c=relaxed/simple; bh=pbnQvUObWHChwdeU78kOb32OMWw/eiCrDdOE9qMKDbw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Ule4YIrI8LzUHdfZ2wvtzGQL06c9cyOH5DYupUbrZ32tMns9+4tLDAn3OG2C38VcWOXWHYt1P5Pse2YFpd4t7CWFmF0eqVB93atTBbAkqOHWohVbxybwtQ74acMtqIYhosm514E27/bmUggHXKhTzFUu5yyeRsYIaAJKvA1viRU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Yk/F8Cu5; arc=none smtp.client-ip=209.85.216.47 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Yk/F8Cu5" Received: by mail-pj1-f47.google.com with SMTP id 98e67ed59e1d1-37ce68a54f8so138952a91.0 for ; Thu, 25 Jun 2026 11:35:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1782412550; x=1783017350; darn=vger.kernel.org; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:cc:to:from:subject:message-id:from:to:cc:subject :date:message-id:reply-to; bh=pbnQvUObWHChwdeU78kOb32OMWw/eiCrDdOE9qMKDbw=; b=Yk/F8Cu5z9Qftq4kL0YbHWeIynpcRxizHquF1lznHRBvb3b3w1LvYe28m4/RXuv9Dj T6Cg/q46U4vH9/QcRmoc0ldENQvifiGxKvm296GB6V7EuasCC0ZytIc6HZQd5HSrEgEE aQAxMMYBYC3+CPXAhRocG3GSWB97CUeie2ckISbY1Ns/AWaPX1Ix9MfFi9vxknulDTTw jA8AaWmgrQuPQwbwascNaGLIz7cADlUC768Tiv9b5nug81d4snqB/OfW8zqIfCte6ctr rvuxTiraCKE4pqbJ3NMWdp1KSrG1gzP9m75PM3Mnfi6sVj1IRiW6Flk12bdrMW8SYMaU 6Egg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782412550; x=1783017350; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:cc:to:from:subject:message-id:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=pbnQvUObWHChwdeU78kOb32OMWw/eiCrDdOE9qMKDbw=; b=ofCyeHgNlBKGbsKwE6vW5/7TwIe2MjA04VPWhaBD5wD7zMqpz5SPoZhW1yP5OiIn9G WEktdVuKEiYIIYsOeKhyvALxxvIgRcH3N+eRmNVRC0IZYR4gHxoxtPJrFhanYKWEtsGn +ZqmDyrTTKKbCgOHwSL7giEF3yNf6hRGApkf1vSoGehDzW6oB71Fg9rMQD+WfL6Pexuo 5+vr7LfQc156BtJu5v+B3qKiWoEtaxQKjqWeMdtFlAKRwA9zNJx8t1XXXwQwDlDRKDDR iW06xlqsEzgGYxFvCZ/cfMREx085yIAh3tjQfAO3tq45FmU659PtqyBGn1+4GOqnXddK hW/g== X-Forwarded-Encrypted: i=1; AHgh+RofrI6e9VHocfV697tnqOcgYkDRdKokPlILP8TLGOXNSmICphhrkattO7Nzm+dp0p1ElQz5ll5d2AfX+Lk=@vger.kernel.org X-Gm-Message-State: AOJu0Yy1FUkCWejAVve4uTaTHyOgjmTIhqVTyZbdcBEEbaOVWlCb799Y S7EcUKVgBjqhEUinpRVpmL93afsu4bcTEMvTRsj+WDeX8658hSoBMy4L X-Gm-Gg: AfdE7cmxUVrA3hPOQh/+uoQxU5shgNE07R0b1Lb74w4DICPRHSXrToj/q2Mjhe4KtoC 3X4LEvBChoDFbZcOlNSc9HP+FgXS3VjJl5faCLX+u6Qly8ugjQccss5VtUE45sgj6tW6dVjU57G pOPk7oPa/3spc/6zkCFHm9r4/FYglz0R6tNTCYfXSknCl2h1bPaHSCKBZ7NzRvRZ+VG6FzKob3D Uc2d+02zgD98pn1Xtj2yws5tHjtsFT+ajr6Jil7N9GkxpyCJdVzKNKw2HgQy7opvhoqwyindFAq +mvv1xyRAEtEIc57KVkcK4CjK8deRIwLDGUfd9+DUVQKOyh3OBGUKEDunGMDg+Famffm2AxsRT/ ww55fVJh5FLqqVaebslmuaOC8MF1+hsMnEaMMLdLLBjxDH9yYx2P57IDmM0QRb69yzHSjVbwLdm SG2ySH5zkGEbwErU/dyZ9drpXfTsnH0CZ64nGOZAQ0rA== X-Received: by 2002:a17:90b:270b:b0:37d:edb2:830d with SMTP id 98e67ed59e1d1-37dfa1f3e14mr3498559a91.9.1782412550118; Thu, 25 Jun 2026 11:35:50 -0700 (PDT) Received: from [192.168.0.226] ([38.34.87.7]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-37df4127356sm2326548a91.17.2026.06.25.11.35.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Jun 2026 11:35:49 -0700 (PDT) Message-ID: <34a46040b0e35eb63fa0fd22436bf9e9eee0bc97.camel@gmail.com> Subject: Re: [PATCH bpf 2/2] selftests/bpf: Cover fastcall helper stack reads From: Eduard Zingerman To: Nuoqi Gui , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Kumar Kartikeya Dwivedi Cc: John Fastabend , Martin KaFai Lau , Shuah Khan , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 25 Jun 2026 11:35:39 -0700 In-Reply-To: <20260624-f01-12-fastcall-helper-stack-read-v1-2-e0a86085ef77@mails.tsinghua.edu.cn> References: <20260624-f01-12-fastcall-helper-stack-read-v1-0-e0a86085ef77@mails.tsinghua.edu.cn> <20260624-f01-12-fastcall-helper-stack-read-v1-2-e0a86085ef77@mails.tsinghua.edu.cn> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.1 (3.60.1-1.fc44) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2026-06-24 at 16:39 +0800, Nuoqi Gui wrote: > Add verifier_bpf_fastcall test where a spill/fill pair initializes a stac= k > slot. bpf_csum_diff() later reads it through ARG_PTR_TO_MEM | MEM_RDONLY. >=20 > The translated program must keep the spill and fill materialized. Otherwi= se > the helper reads stack bytes that no longer match the verifier model. >=20 > Signed-off-by: Nuoqi Gui > --- Could you please add a kfunc based test case as well? [...]