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[37.24.206.209]) by smtp.gmail.com with ESMTPSA id z20-20020aa7c654000000b005686184eb77sm723829edr.78.2024.03.14.06.37.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 Mar 2024 06:37:38 -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: 0640739a-e208-11ee-a1ee-f123f15fe8a2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1710423458; x=1711028258; 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=LRPBSc9tVTtYpmQX2XYGrzNR5RaaO3zD+OQAAHDOvQw=; b=Jiz4EIFaUNgITvuupbi/4FO0p+HiBXnqWUSTZbJYCkRZRZQ1CSy4kbZBtw97nVX5Ou PgxEjfwdrx8Ksf0k3BaAaVljkMo5j1pdIwoKKqKBWErsUflQhOsJYg09/f3IoNgniuG/ 1GxHC8TeHX8IVMnp4g/IpE+7omPKOlx3CHxh/2jgBubo0UvelQ25/9XsHQtqatrWEXsh ClJzL4Qubi7hXwZYSOYy099nhZ02iu3U03eBz3XMQJMXAXJJuv/zmBd1fmzlJS38SmIG vQl37z9PAYLbPY5nFhy513lP8YBN10syLhkqYgayrxAeIezf6nxIfTtBviWOgMYJuN23 BhIQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1710423458; x=1711028258; 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=LRPBSc9tVTtYpmQX2XYGrzNR5RaaO3zD+OQAAHDOvQw=; b=hBUSvulZ5RdEBXAXWuxJCSH8M0rymnU2+FgUNRPS97b7Ujoozn2VAJpYIpypld5e67 X2HSqys0eq75Fjp/QPgMO56NYo+wWSzw8YwLTH8qZW8Saqpj3KH3IMKe2feLcHlfbjxE qSyU6JnWcdOV3/xcN6SYKf6n1ze+NuFDwGlH5S/ZMBEPLMy+LyTkSici8EMlWDwGC6kP KMkobFRoMwGPv80OiIur/CqoEN27yrliFx7+Q1PkjVNzrdtE9+TCut0Kz907sz0NsBX5 rUnvDb3AgDQ/HzYpaJmv+l90DDoKNKDFn+29O6Imny6q4PpagPMWvbugniSH9XC8/WKP uhTw== X-Gm-Message-State: AOJu0YxKTzrRCNzXgt9R6nkBxMNn+pxkWDVwLqprLhADhInTzPCR8nEM R5PXECj352leNBqetmHhYwBCRtEBsuKEaYk8Z/PeQsYvZB14Yx8gqlkFH5lKwQ== X-Google-Smtp-Source: AGHT+IHj9RaEr/1IeBfRbWxPvhwnXm2Z4pLX6zJ4vTzphYNCb6jWQln9LpIlJvEyMmHgrJftx+i91g== X-Received: by 2002:a05:6402:4586:b0:568:2505:93ad with SMTP id ig6-20020a056402458600b00568250593admr1218061edb.5.1710423458382; Thu, 14 Mar 2024 06:37:38 -0700 (PDT) Message-ID: Date: Thu, 14 Mar 2024 14:37:37 +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 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. > I didn't choose that route because: > > * Signed PE binaries are the current standard for Secure Boot. > > * Having signed ELF binaries would mean that code to handle them needs > to be added to Shim which contravenes its goals of being small and > simple to verify. Both true, but neither goes entirely without saying, I suppose. > * I could be wrong on this but to my knowledge, the ELF format is not > being actively updated nor is the standard owned/maintained by a > specific group which makes updating it difficult. And PE/COFF isn't under control of a public entity / group afaik, which may be viewed as no better, if not worse. > * Tools would need to be updated/developed to add support for signing > ELF binaries and inspecting the signatures. As above, yes indeed. Jan