From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lamorak.hansenpartnership.com (lamorak.hansenpartnership.com [198.37.111.173]) (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 8931B278E44; Wed, 23 Apr 2025 14:12:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.37.111.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745417533; cv=none; b=KfUSeVFlVPxw4fR+7zudI8kCjpduJG/OUXnycyLV/zI2EVu1v0nFj38mpXJ6CMSTW2y4YLWHWvISOM6kkPedC1x3lAjiR5JYJNngiB39IY+xqftyCCdkSEGvBZLZvaocZ9F+LWsG7OWt3bw0RFXu5AXDYZJbbA8grphnS8lQ4hI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745417533; c=relaxed/simple; bh=PgSnKh8AEc/BlZebuyDsWHMlwgMJf/opyEbGRKOxu4k=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Trfr7ebanAQOHfb01/Zi39KCVrnbUmBv2FNudIILqKiRn8wWAgjo2ZtAc4QpgBgzFWXASVJSL26NDjQ1rFZnTmNi0M4MWgXE/s3ksrL9p9lCfUPd21aVp+MejCWb3ROSPDYPDJw66mIy5ck477LW9XgsK/aJJC1P2GH2LCif4zs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com; spf=pass smtp.mailfrom=HansenPartnership.com; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b=sxLeTY3K; arc=none smtp.client-ip=198.37.111.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="sxLeTY3K" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hansenpartnership.com; s=20151216; t=1745417529; bh=PgSnKh8AEc/BlZebuyDsWHMlwgMJf/opyEbGRKOxu4k=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References:From; b=sxLeTY3KdvSkeDFWrUc36f6EQ2ePLTba1rMhxaQlR/Ez6nbr8jlu2hI49MqIzn4g5 cpJDgN2gi5DtPuz3ueKMrlueLgKC7r2aaICWQ46obvjJ1rBZgTTamoF+dBT/yqE/0l PA8KLQBcl4Yl+yWak5Te+fLRqVzqWgtet8RHJZQc= Received: from lingrow.int.hansenpartnership.com (unknown [IPv6:2601:5c4:4302:c21::a774]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lamorak.hansenpartnership.com (Postfix) with ESMTPSA id 4031A1C0283; Wed, 23 Apr 2025 10:12:08 -0400 (EDT) Message-ID: <2bd95ca78e836db0775da8237792e8448b8eec62.camel@HansenPartnership.com> Subject: Re: [PATCH v2 security-next 1/4] security: Hornet LSM From: James Bottomley To: Alexei Starovoitov , Blaise Boscaccy Cc: Jonathan Corbet , David Howells , Herbert Xu , "David S. Miller" , Paul Moore , James Morris , "Serge E. Hallyn" , Masahiro Yamada , Nathan Chancellor , Nicolas Schier , Shuah Khan , =?ISO-8859-1?Q?Micka=EBl_Sala=FCn?= , =?ISO-8859-1?Q?G=FCnther?= Noack , Nick Desaulniers , Bill Wendling , Justin Stitt , Jarkko Sakkinen , Jan Stancek , Neal Gompa , "open list:DOCUMENTATION" , LKML , keyrings@vger.kernel.org, Linux Crypto Mailing List , LSM List , Linux Kbuild mailing list , "open list:KERNEL SELFTEST FRAMEWORK" , bpf , clang-built-linux , nkapron@google.com, Matteo Croce , Roberto Sassu , Cong Wang Date: Wed, 23 Apr 2025 10:12:07 -0400 In-Reply-To: References: <20250404215527.1563146-1-bboscaccy@linux.microsoft.com> <20250404215527.1563146-2-bboscaccy@linux.microsoft.com> <87semdjxcp.fsf@microsoft.com> <87friajmd5.fsf@microsoft.com> <87a58hjune.fsf@microsoft.com> <87y0w0hv2x.fsf@microsoft.com> Autocrypt: addr=James.Bottomley@HansenPartnership.com; prefer-encrypt=mutual; keydata=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8mT2Eh9SkH+YVOmaKsajgZgrBxA7fWmGoxXswEVxJIFj3vW7yNc0C5HaUdYa5iGOMs4kg2ht4s7yy7NRQuh7BifWjo6BQ6k4S1H+6axZucxhSV1L6zN9d+lr3Xo/vy1unzA== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2025-04-21 at 13:12 -0700, Alexei Starovoitov wrote: [...] > Calling bpf_map_get() and > map->ops->map_lookup_elem() from a module is not ok either. I don't understand this objection. The program just got passed in to bpf_prog_load() as a set of attributes which, for a light skeleton, directly contain the code as a blob and have the various BTF relocations as a blob in a single element array map. I think everyone agrees that the integrity of the program would be compromised by modifications to the relocations, so the security_bpf_prog_load() hook can't make an integrity determination without examining both. If the hook can't use the bpf_maps.. APIs directly is there some other API it should be using to get the relocations, or are you saying that the security_bpf_prog_load() hook isn't fit for purpose and it should be called after the bpf core has loaded the relocations so they can be provided to the hook as an argument? The above, by the way, is independent of signing, because it applies to any determination that might be made in the security_bpf_prog_load() hook regardless of purpose. Regards, James