On Tue, Mar 11, 2025 at 5:33 AM Heiko Carstens <hca@xxxxxxxxxxxxx> wrote:
>
> Provide support for CONFIG_MSEAL_SYSTEM_MAPPINGS on s390, covering the
> vdso.
>
> Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
> ---
> 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@xxxxxxxxxxxx>
