From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 28BA63BFAD1 for ; Mon, 6 Jul 2026 23:40:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783381246; cv=none; b=YB6f3LFVVNUocGifZvCnNYtnox5b8tmAQOoK6qzlWnGvRqAFXJpoITBMtwmiKVJ6t0P+NsuHassBwJV26OLS4jlhn175WYRgJns+pIgL8ChIU5bUkMTwP8mQszJ5l+ueC6k/RFYOkk28w6mg8tr2m/Nztv/YiZbAMXLgaETSQbI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783381246; c=relaxed/simple; bh=7QesUruqc+FIJInkd3DkDGSkaeIJFu0n7Nm8MfE+FEY=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References; b=TYws763CySxJa7+BL7PtJjAQi781G//Ho/yTqZtXTWgxtjkzetgoO48Nu1e31OkWoTUZjbBjzLn+Uzkh8RH5e5DJRG1ZItAXH/w2TcsITWrc07fBDoIbn3ePpZlm40aMTx2Krrv+rf4Ct/VTPeSltWQqrD2ewlpbuBx3uttB4A0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=je4iEaq/; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="je4iEaq/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D2AB71F00A3A; Mon, 6 Jul 2026 23:40:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783381245; bh=7QesUruqc+FIJInkd3DkDGSkaeIJFu0n7Nm8MfE+FEY=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=je4iEaq/O1p84iCT/or2kverPXNrrsGTL0ZTo45XixXP2w75Cm1tr6RMNgP2xk4Hu ENauuSgDwvyZ35ePphlKsxiEDlxi90zPb4msxc5Ad5udf8aFb91dtGi3qyIPUSJfbx zhwo+PdSa4s3yJltkIxXIgvsFhmofvCe//ej5rdZiZ4k4QOrng7LxP4KioVv7IXqi8 4qLt20UxU4ZY2dH21D/9V9Mb51iopCzgzAF+EWVdJK9sIBpXi7jtWPfi4BiP4mmpRt iEVTLUETl76+cj01SuGRqnlIZGPdCWYTN8SXZRmCkp9SmO4Bikv5rkF7RiwY/74Nx9 QjqIwj2j8/d+Q== Date: Mon, 06 Jul 2026 13:40:44 -1000 Message-ID: From: Tejun Heo To: sashiko-bot@kernel.org Cc: sched-ext@lists.linux.dev Subject: Re: [PATCH v2 sched_ext/for-7.3 20/36] sched_ext: Add coalescing sub_caps_updated() notifier for sub-schedulers In-Reply-To: <20260706020627.2A7D41F000E9@smtp.kernel.org> References: <20260706014058.439853-1-tj@kernel.org> <20260706014058.439853-21-tj@kernel.org> <20260706020627.2A7D41F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: sched-ext@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: On Mon, 06 Jul 2026 02:06:24 +0000, sashiko-bot wrote: > - [High] Missing private stack request for recursive BPF callback `sub_caps_updated` leads to kernel stack exhaustion and local DoS. 20-1 (recursive callback / private stack): confirmed, fixed for v3. sub_caps_updated() now requests a private stack via bpf_scx_check_member(), like ops.dispatch(). More generally, any recursion-capable op should request one. 20-2 (no-arena NULL deref): false positive, same as the other no-arena reports - cid-form requires an arena at load.