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[37.24.206.209]) by smtp.gmail.com with ESMTPSA id v23-20020a1709067d9700b00a4663a7120asm758327ejo.166.2024.03.14.07.33.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 Mar 2024 07:33:02 -0700 (PDT) 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: c3d49105-e20f-11ee-afdd-a90da7624cb6 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1710426783; x=1711031583; darn=lists.xenproject.org; h=content-transfer-encoding:in-reply-to:autocrypt:from:references:cc :to:content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=QRzneQIbB1lWKpJoC5q0aXoJLsyRGUVQnNwFc8SYcz8=; b=SEdCToGGn4rjEvALoaRKSZGdK+LDL/X3dF/u4tKX+rMX2yr9hjuwLzWWfbkfFZFWzK 3Xtxq/Sa5SMz2DsthzvjfEtNVDNhs0dCzyGHXea2oI1Hbz1O6u+UwvXs9ufyOk+oQtBh r9/K4G7pR6BMJh/pMK9L0K0Ungu89FfUwkM/GmOxfr+EyAQMrxHLfRvL6O0gEORl3QYM 7Kc/9zSXDneqIboNK4TeYdbJuPEY+7Z/0t7X/R5aGNCXha/w8HsC1dSI7DSX2G8LfTxp clwRp3kMXZ1zuYHgQFoADcSEnwRf5ncWinZJo9gFEgDxvC/p5ahz7oZPxOQD6Fwugd6D bWbg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1710426783; x=1711031583; h=content-transfer-encoding:in-reply-to:autocrypt:from:references:cc :to:content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=QRzneQIbB1lWKpJoC5q0aXoJLsyRGUVQnNwFc8SYcz8=; b=hdLqcC9wm/E8ZQsfZWPlVkY+Px2NKVzyzpmtb7xoRyqB4++JmZdgbyEG9AwFBXGZQD Ed7U4XJhJuGOzLPfq/7Ef3IHcI2nH8zg9c5/dwjjkGR7oB6TRpCBKr+rAr5Sd2f4HGmG 8pYxvc4UUmN7GfwkI92yCR/G5X2fCRtrahgHSmCOPRgUZGiAdft2MApmOLHylOTip4f7 +loQO1ZuvVPBUwzN2/khZFnwuIvwakzydqhn6/o246PHy4B2E7bnZlFFCdM613TjSljd Lin+pSCx+vOZGun9JFcNuMSYsL8OQguN2/dUm/BqIS0VU6qzqmFwj4oAI4QabkE+pPGN U4wg== X-Gm-Message-State: AOJu0YzIig1QrQYTLjhoGyvGeMxwE8O7620Eb1CQuSSP2UHECKiub2Yz Kf8k/WbSaiMWLU70tweZf3BldwxdmxHXYY1RkkWTpIcxxG2Tnt2aAYoxN3rc4Q== X-Google-Smtp-Source: AGHT+IE/hyKjk4oxselP63p81n5F0QgPzuyAWalggblhlofF0UOzNbsSYDYrVITmuTXodkKqJqyyZw== X-Received: by 2002:a17:907:d40d:b0:a43:49ca:2473 with SMTP id vi13-20020a170907d40d00b00a4349ca2473mr947071ejc.0.1710426782891; Thu, 14 Mar 2024 07:33:02 -0700 (PDT) Message-ID: Date: Thu, 14 Mar 2024 15:33:01 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/7] multiboot2: Add load type header and support for the PE binary type Content-Language: en-US To: Ross Lagerwall Cc: xen-devel@lists.xenproject.org, Andrew Cooper , Daniel Kiper , grub-devel@gnu.org References: <20240313150748.791236-1-ross.lagerwall@citrix.com> <20240313150748.791236-2-ross.lagerwall@citrix.com> From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 14.03.2024 15:24, Ross Lagerwall wrote: > On Thu, Mar 14, 2024 at 1:37 PM Jan Beulich wrote: >> On 14.03.2024 10:30, Ross Lagerwall wrote: >>> On Thu, Mar 14, 2024 at 7:24 AM Jan Beulich wrote: >>>> On 13.03.2024 16:07, Ross Lagerwall wrote: >>>>> In addition to the existing address and ELF load types, specify a new >>>>> optional PE binary load type. This new type is a useful addition since >>>>> PE binaries can be signed and verified (i.e. used with Secure Boot). >>>> >>>> And the consideration to have ELF signable (by whatever extension to >>>> the ELF spec) went nowhere? >>> >>> I'm not sure if you're referring to some ongoing work to create signable >>> ELFs that I'm not aware of. >> >> Something must have been invented already to make Linux modules signable. > > Linux module signatures operate outside of the ELF container. In fact, > AFAIK the actual signed content could be anything. The file format is: > > * Content (i.e. ELF binary) > * Signature of content in PKCS7 format > * Signature info, including signature length > * Magic marker: "~Module signature appended~\n" > > This kind of arrangement does indeed work but it is fragile. Since the > signature is on the entire contents and tools that understand ELF don't > parse the signature, any transformation of the binary (e.g. to > strip out debuginfo) will cause the signature to be lost / invalidated. This looks extremely poor to me, so ... > Nevertheless, this could still be an option for Xen if this is > deemed to be a preferred solution by others. It would be good to hear > some opinions on this. ... I'd rather not see this used for Xen. 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