linux-kernel - Re: [PATCH mm-unstable 2/2] mseal sysmap: enable s390

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Message-ID: <CABi2SkXWD4Pg7Y7TG9fMV9eat_1fOGwHjvEUKHXREN+pRe18NA@mail.gmail.com>
Date: Tue, 11 Mar 2025 14:55:59 -0700
From: Jeff Xu <jeffxu@...omium.org>
To: Heiko Carstens <hca@...ux.ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	"Liam R . Howlett" <Liam.Howlett@...cle.com>, Kees Cook <kees@...nel.org>, 
	Thomas Weißschuh <thomas.weissschuh@...utronix.de>, 
	Alexander Gordeev <agordeev@...ux.ibm.com>, Sven Schnelle <svens@...ux.ibm.com>, 
	Vasily Gorbik <gor@...ux.ibm.com>, Christian Borntraeger <borntraeger@...ux.ibm.com>, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH mm-unstable 2/2] mseal sysmap: enable s390

On Tue, Mar 11, 2025 at 5:33 AM Heiko Carstens <hca@...ux.ibm.com> wrote:
>
> Provide support for CONFIG_MSEAL_SYSTEM_MAPPINGS on s390, covering the
> vdso.
>
> Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
> ---
>  arch/s390/Kconfig       | 1 +
>  arch/s390/kernel/vdso.c | 2 +-
>  2 files changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
> index 608a965e2344..93b880992596 100644
> --- a/arch/s390/Kconfig
> +++ b/arch/s390/Kconfig
> @@ -141,6 +141,7 @@ config S390
>         select ARCH_SUPPORTS_DEBUG_PAGEALLOC
>         select ARCH_SUPPORTS_HUGETLBFS
>         select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && CC_IS_CLANG
> +       select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS
>         select ARCH_SUPPORTS_NUMA_BALANCING
>         select ARCH_SUPPORTS_PER_VMA_LOCK
>         select ARCH_USE_BUILTIN_BSWAP
> diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
> index 70c8f9ad13cd..430feb1a5013 100644
> --- a/arch/s390/kernel/vdso.c
> +++ b/arch/s390/kernel/vdso.c
> @@ -80,7 +80,7 @@ static int map_vdso(unsigned long addr, unsigned long vdso_mapping_len)
>         vdso_text_start = vvar_start + VDSO_NR_PAGES * PAGE_SIZE;
>         /* VM_MAYWRITE for COW so gdb can set breakpoints */
>         vma = _install_special_mapping(mm, vdso_text_start, vdso_text_len,
> -                                      VM_READ|VM_EXEC|
> +                                      VM_READ|VM_EXEC|VM_SEALED_SYSMAP|
>                                        VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
>                                        vdso_mapping);
>         if (IS_ERR(vma)) {
> --
> 2.45.2
>
Great ! one more architecture uses this feature.

Reviewed-by: Jeff Xu <jeffxu@...omium.org>