From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj2-f13.google.com (mail-pj2-f13.google.com [74.125.227.141]) (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 EAD5E2E2663 for ; Tue, 22 Sep 2026 01:55:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.227.141 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790042109; cv=none; b=gBI/tNcvAoOW80gYZwYM1jX0n+JD0OuGBySGiOUG5PJ9LIbCsguLsFWltjdYFhUvBgkoG9GQc2Lmq2m1b1NU4aVtB0p5pDKLB+AFcKjjqYQMvqgxBjM01KmJwjphOX3XOAKzVSNHhBbHR/dfnE9b8KJ8QHoszBx5BhhVYMypjc4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790042109; c=relaxed/simple; bh=kmwinMqyVyK6F6efS9rTUE8kNEppKMqQ9v6+PhIJL9E=; h=Content-Type:Date:Message-Id:Cc:Subject:From:To:In-Reply-To: References:MIME-Version; b=P71q/w7ezL4XUulSG52z5rA1JVg75eOJnjGZMIsGFyWIeZQLcxI8t5KTghtxDCyQnNxH0qzicm7Rd9wa5lubgP1DZcAzxSET/UvEKsOtWrEImpAGLDPzLrE1KmkVSHC/P9AI+/1APaiQArQEQgMfHyu8t1Romco/O/dhs+l7VWk= 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=hj3GvVhg; arc=none smtp.client-ip=74.125.227.141 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="hj3GvVhg" Received: by mail-pj2-f13.google.com with SMTP id d9443c01a7336-2dd4b43b20bso25919825ad.1 for ; Mon, 21 Sep 2026 18:55:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1790042107; x=1790646907; darn=vger.kernel.org; h=mime-version:content-transfer-encoding:references:in-reply-to:to :from:subject:cc:message-id:date:content-type:from:to:cc:subject :date:message-id:reply-to:content-type; bh=g4jCTOSbAnex1HQAgqcYLzBLa9FVcPlYvAMPVHtej0s=; b=hj3GvVhg/r5zNBEVjeKBfncOFFaxtRWc/vBhSqZPzpcp1+NmUS6mC6XDOuS1beSbDK vUIvg7IflcCoaDv2jZuB5abd2c5lKNWvW+d4kxdvlsjyocjSkgLFiVRoWQ9sPWdN0sAr O+awGKH8ciRwq/kkBvLwX5So/5XKW0BB0klxsj2av0lXbIfRrAzTZ35TnX/ElzpkofXh ZWJ/wv9pGOp8ZR/z9oGVMTBjbApTGm+lqJYG7Hd+nR+1YyUK1Q+Xe00No6MzTWBczRhw YCScICpqiJciEsk4vwDv5Zap/t44AwNwBmRB11pdaG+fDLEBjYsrz0FR1JORtXB0/R76 IxcQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790042107; x=1790646907; h=mime-version:content-transfer-encoding:references:in-reply-to:to :from:subject:cc:message-id:date:content-type:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=g4jCTOSbAnex1HQAgqcYLzBLa9FVcPlYvAMPVHtej0s=; b=l9fZB3Xc/0kI49uGqws8FJHf+WqDMGat3Y6wjUOvR9IDjD+Kzzr4hIwLSYx5BQ2PLJ vblIcdOvOIQ0puN5AeKShgaWaEfdqIKA2+nnD5zIhN8UOOTpT2rgHuzghZ/vINWjrqvn GDqiBSi2Wd0dUZ+fSKsHrGvVfsLnYMl22DbqOMoNLVob+hZu8KHUp9TW5Or9UDCAXKei x31ouhUm/D6Ie+Q0KypTNmN3XIgPy6utmlDz5fFGtAmzKBEFuZYKPF0a9PL+MsxkZ1NV i2hBjuC5RbI0IfVgTFfhw38uXDjP/gSYgdKsMB/rL9YBvh13Sx5VgpVJlpV9Y++N5gQU HDuA== X-Forwarded-Encrypted: i=1; AKwUvByldvr1gcXIB9RDVFECnVwRuoFdKh8Em0v/rMROI8F/RugSzghPtWwQjGTXf80U8U1JphM=@vger.kernel.org X-Gm-Message-State: AFuF++l3ht8Owf8smoMaCaizLErMq11Et5SVn6fv4TJw8Qvy/QmAsAGq yyktd+oHQ87IBmET+dbhxIdVrcUqNiQE8a5ATxeBelfqerIku2/1QG5R X-Gm-Gg: AYBFou2t8gzKm7J+OmiyKUQUA8E2kTdn8rxhRAoLLOtxif29xSZkf/gIognSX/22epp 1+NPtFRHAEeqRbc4bt3MipoF5GLnvy9q+YDEtcbxm3N97zZcQSqG0vmnGInYx22ZlivhvKDQo3n KnQjLdRafvxw2XV0GoX78G6/qO425nOl3MZyLBimyNHZzbZbI4+3GWhQ1YEespPW4Jtm7bmKD5E VSwMqf5r8X9ELeFg9XMT2UMymwmfLE44Sti5v0OLwbSY+quYrmArufwRJjOJGxaAzatuET8SdyF 8wfMI8mUgPHYLT5iki2UpFgmUjjStFpiDrKgaPqCzcSywP6GT5mpEkwxWhMt1B8YbHNDAms3DvV Fy0slbWQvw8J0zD6HzRFrBdqPzI9o1p3nKwDXxjOncUORnQh/eF+qeUszXf8StmoKDsb+n8THC3 568IPKjdvpc2OM8nYOko7nVh/OUfp+yLASvh3fgNNTzFNN/zNEW5ZWc/3RLeneSDWgG9XS8HZ8o iiQCHL4iMAv1yM8tzKeIR/jZqF7MlXIjOdwodRTX/TGBqjw/ZQgSyb8+oz3QoQFbu3Gh241fNHd Eqa5KJUwic2wRQ== X-Received: by 2002:a17:902:c94d:b0:2dd:c100:424a with SMTP id d9443c01a7336-2ddc100453amr120434615ad.46.1790042107183; Mon, 21 Sep 2026 18:55:07 -0700 (PDT) Received: from localhost ([153.61.198.255]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2df5d066d3asm1193085ad.78.2026.09.21.18.55.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Sep 2026 18:55:06 -0700 (PDT) Content-Type: text/plain; charset=UTF-8 Date: Tue, 22 Sep 2026 01:55:06 +0000 Message-Id: Cc: "Amery Hung" , "Emil Tsalapatis" , "Nicholas Carlini" , , , Subject: Re: [PATCH bpf-next v1 0/6] bpf: Scope callback arguments to their frame From: "Alexei Starovoitov" To: "Ihor Solodrai" , "Andrii Nakryiko" , "Daniel Borkmann" , "Eduard Zingerman" , "Kumar Kartikeya Dwivedi" In-Reply-To: <20260922010333.1226537-1-ihor.solodrai@linux.dev> References: <20260922010333.1226537-1-ihor.solodrai@linux.dev> X-Mailer: mkdraft (claude review draft; edit before sending) Content-Transfer-Encoding: 8bit Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, Sep 21, 2026 at 06:03 PM Ihor Solodrai wrote: > Neither has a local fix: both arguments point into a helper's own > frame, with nothing longer-lived to anchor them to. It's the same problem as a pointer to callee's stack. check_stack_write_fixed_off() deals with it like this: if (state != cur && reg->type == PTR_TO_STACK) { verbose(env, "cannot spill pointers to stack into stack frame of the caller\n"); return -EINVAL; } CONST_PTR_TO_DYNPTR wasn't spillable before 7.3, so nothing depends on parking it in the caller's frame. Reject it there too ? and then no need for REF_TYPE_FRAME complexity?