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Tue, 16 Jun 2026 06:50:26 -0700 (PDT) Message-ID: <53afba1b-a791-4ebe-9d00-3ca66065c524@suse.com> Date: Tue, 16 Jun 2026 15:50:25 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 4/4] x86: Split .init section to satisfy UEFI CA memory mitigation To: Andrew Cooper , =?UTF-8?Q?Marek_Marczykowski-G=C3=B3recki?= , Frediano Ziglio Cc: xen-devel@lists.xenproject.org, Frediano Ziglio , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= , Teddy Astie , Frediano Ziglio References: <20260616101336.44009-1-frediano.ziglio@citrix.com> <20260616101336.44009-5-frediano.ziglio@citrix.com> <8b27a14e-865a-462e-a6dd-1f8323de5f43@suse.com> Content-Language: en-US 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 X-purgate-ID: tlsNG-16d1c6/1781617826-8777FD75-8A21131F/0/0 X-purgate-type: clean X-purgate-size: 1594 On 16.06.2026 14:40, Andrew Cooper wrote: > On 16/06/2026 1:30 pm, Jan Beulich wrote: >> On 16.06.2026 13:29, Andrew Cooper wrote: >>> On 16/06/2026 12:20 pm, Marek Marczykowski-Górecki wrote: >>>> On Tue, Jun 16, 2026 at 11:13:36AM +0100, Frediano Ziglio wrote: >>>>> From: Frediano Ziglio >>>>> >>>>> Currently .init section is both writeable and executable, split data and code >>>>> to have 2 sections satisfying W^X rule. >>>>> >>>>> It is a requirement for NX_COMPAT so the PE can be loaded with W^X perms >>>>> in the pagetables. >>>>> >>>>> NX_COMPAT is a requirement from shim-review, >>>>> https://github.com/rhboot/shim-review#do-you-have-the-nx-bit-set-in-your-shim-if-so-is-your-entire-boot-stack-nx-compatible-and-what-testing-have-you-done-to-ensure-such-compatibility >>>>> >>>>> Signed-off-by: Frediano Ziglio >>>> Acked-by: Marek Marczykowski-Górecki >>>> >>>> Is that the last piece necessary to satisfy the NX_COMPAT requirement? If >>>> so, I suppose a subsequent patch should actually set the >>>> IMAGE_DLLCHARACTERISTICS_NX_COMPAT bit (IIUC ld --nxcompat option), right? >>> We need to satisfy everything in >>> https://github.com/xenserver/xen.pg/blob/XS-9/patches/correct-sections-permissions.patch >>> >>> .reloc needs to be non-discardable and writeable. >> Writable? Why? > > Because we take fatal pagefaults against it when it's really read-only. Wasn't this for relocations _against_ r/o sections, not the .reloc section itself? Jan