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Fri, 05 Mar 2021 14:33:50 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 23082ACCF; Fri, 5 Mar 2021 14:33:49 +0000 (UTC) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 139eb328-1550-4d93-96bb-d6ca7b1cd511 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1614954829; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=HY7VA4WlavSs8rrOM4kbIGFkTRXgPec3TtU7A86W6CY=; b=IcTn7YG9WmU/wq6AgjJzrkuCbuR8LoB/8oaG807GWU7sXUpkYbDhy+4/uqBhq75ha7xtLA +vVpAqzv3kCL7pv2SX+gcamr7YT8I0TUSqwAp8WpjYXx3hxR4X9t9/aq/r428gubntwToV khusX4VaNaKwGxKZzUBLFA62QKPx6eE= Subject: Re: [PATCH for-4.15] tools/xenstored: liveupdate: Increase the maximum number of parameters To: Ian Jackson , Julien Grall Cc: xen-devel@lists.xenproject.org, raphning@amazon.co.uk, Julien Grall References: <20210305121029.7047-1-julien@xen.org> <24642.12417.651929.972294@mariner.uk.xensource.com> From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Message-ID: Date: Fri, 5 Mar 2021 15:33:48 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: <24642.12417.651929.972294@mariner.uk.xensource.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="3jOVDupz9YmR2v9RtbCs3JU1avoga0cdj" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --3jOVDupz9YmR2v9RtbCs3JU1avoga0cdj Content-Type: multipart/mixed; boundary="mwPqcd5P5Nyo9bDNwWOMHTRXLjPFKwsGG"; protected-headers="v1" From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= To: Ian Jackson , Julien Grall Cc: xen-devel@lists.xenproject.org, raphning@amazon.co.uk, Julien Grall Message-ID: Subject: Re: [PATCH for-4.15] tools/xenstored: liveupdate: Increase the maximum number of parameters References: <20210305121029.7047-1-julien@xen.org> <24642.12417.651929.972294@mariner.uk.xensource.com> In-Reply-To: <24642.12417.651929.972294@mariner.uk.xensource.com> --mwPqcd5P5Nyo9bDNwWOMHTRXLjPFKwsGG Content-Type: multipart/mixed; boundary="------------CBF00FAA24D3A24640D9B3B5" Content-Language: en-US This is a multi-part message in MIME format. --------------CBF00FAA24D3A24640D9B3B5 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 05.03.21 14:22, Ian Jackson wrote: > Julien Grall writes ("[PATCH for-4.15] tools/xenstored: liveupdate: Inc= rease the maximum number of parameters"): >> From: Julien Grall >> >> The longest possible command line for LiveUpdate is: >> >> liveupdate -s -t -F >> >> This is 5 parameters. However, the maximum is currently specified to 4= =2E >> This means the some of the parameters will get ignored. >=20 > Why are the extra parameters ignored rather than treated as errors ? > This seems like an invitation to making code with bad behaviour > (perhaps bad security-relevant behaviour). >=20 > CC Juergen who seems to have written the code... This is the max number of 0 delimited string parameters. Especially the stubdom case needs a binary blob (with length, of course) as parameter, and the number of 0 bytes in this data is just limited by the allowed payload length. See the comment in line 111 of xenstored_control.c. 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