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Re: [PATCH 6/6] x86: Split .init section to satisfy UEFI CA memory mitigation
- To: Frediano Ziglio <freddy77@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 2 Jun 2026 14:25:14 +0200
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- Cc: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 02 Jun 2026 12:25:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 29.05.2026 17:35, Frediano Ziglio wrote:
> Currently .init section is both writeable and executable, split data and code
> to have 2 sections satisfying W^X rule.
>
> Signed-off-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
Like for the earlier patch: Reference please to where this requirement is
stated.
> --- a/xen/arch/x86/xen.lds.S
> +++ b/xen/arch/x86/xen.lds.S
> @@ -193,11 +193,7 @@ SECTIONS
> __2M_init_start = .; /* Start of 2M superpages, mapped RWX (boot
> only). */
> . = ALIGN(PAGE_SIZE); /* Init code and data */
> __init_begin = .;
> -#ifdef EFI /* EFI wants to merge all of .init.* ELF doesn't. */
> - DECL_SECTION(.init) {
> -#else
> DECL_SECTION(.init.text) {
> -#endif
> _sinittext = .;
> *(.init.text)
> *(.text.startup)
> @@ -210,12 +206,12 @@ SECTIONS
> */
> *(.altinstr_replacement)
>
> -#ifdef EFI /* EFI wants to merge all of .init.* ELF doesn't. */
> - . = ALIGN(SMP_CACHE_BYTES);
> -#else
> } PHDR(text)
> - DECL_SECTION(.init.data) {
> +#ifdef EFI
> + /* align to satisfy UEFI CA memory mitigation */
> + . = ALIGN(SECTION_ALIGN);
Nit (also for the earlier patch iirc): Comment style.
Jan
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