linux-hardening - Re: [PATCH v8 3/7] mseal sysmap: enable x86-64

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Message-ID: <24be17fd-4899-49ae-9b4e-9372fcb4e0cd@lucifer.local>
Date: Mon, 3 Mar 2025 12:01:46 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: jeffxu@...omium.org
Cc: akpm@...ux-foundation.org, keescook@...omium.org, jannh@...gle.com,
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Subject: Re: [PATCH v8 3/7] mseal sysmap: enable x86-64

I tried b4 shazam'ing this and there's a problem applying the patch, seems
maybe a conflict?

Not sure if Andrew can resolve or if something needs to be done here?

Seems to be commit d77a800944d8 ("mm: make DEBUG_@WX dependent on
GENERIC_PTDUMP")?

Should be a trivial resolve though.

On Mon, Mar 03, 2025 at 05:09:17AM +0000, jeffxu@...omium.org wrote:
> From: Jeff Xu <jeffxu@...omium.org>
>
> Provide support for CONFIG_MSEAL_SYSTEM_MAPPINGS on x86-64,
> covering the vdso, vvar, vvar_vclock.
>
> Production release testing passes on Android and Chrome OS.
>
> Signed-off-by: Jeff Xu <jeffxu@...omium.org>
> ---
>  arch/x86/Kconfig          | 1 +
>  arch/x86/entry/vdso/vma.c | 7 ++++---
>  2 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index be2c311f5118..c6f9ebcbe009 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -26,6 +26,7 @@ config X86_64
>  	depends on 64BIT
>  	# Options that are inherently 64-bit kernel only:
>  	select ARCH_HAS_GIGANTIC_PAGE
> +	select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS
>  	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
>  	select ARCH_SUPPORTS_PER_VMA_LOCK
>  	select ARCH_SUPPORTS_HUGE_PFNMAP if TRANSPARENT_HUGEPAGE
> diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c
> index 39e6efc1a9ca..a4f312495de1 100644
> --- a/arch/x86/entry/vdso/vma.c
> +++ b/arch/x86/entry/vdso/vma.c
> @@ -268,7 +268,8 @@ static int map_vdso(const struct vdso_image *image, unsigned long addr)
>  				       text_start,
>  				       image->size,
>  				       VM_READ|VM_EXEC|
> -				       VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
> +				       VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
> +				       VM_SEALED_SYSMAP,
>  				       &vdso_mapping);
>
>  	if (IS_ERR(vma)) {
> @@ -280,7 +281,7 @@ static int map_vdso(const struct vdso_image *image, unsigned long addr)
>  				       addr,
>  				       (__VVAR_PAGES - VDSO_NR_VCLOCK_PAGES) * PAGE_SIZE,
>  				       VM_READ|VM_MAYREAD|VM_IO|VM_DONTDUMP|
> -				       VM_PFNMAP,
> +				       VM_PFNMAP|VM_SEALED_SYSMAP,
>  				       &vvar_mapping);
>
>  	if (IS_ERR(vma)) {
> @@ -293,7 +294,7 @@ static int map_vdso(const struct vdso_image *image, unsigned long addr)
>  				       addr + (__VVAR_PAGES - VDSO_NR_VCLOCK_PAGES) * PAGE_SIZE,
>  				       VDSO_NR_VCLOCK_PAGES * PAGE_SIZE,
>  				       VM_READ|VM_MAYREAD|VM_IO|VM_DONTDUMP|
> -				       VM_PFNMAP,
> +				       VM_PFNMAP|VM_SEALED_SYSMAP,
>  				       &vvar_vclock_mapping);
>
>  	if (IS_ERR(vma)) {
> --
> 2.48.1.711.g2feabab25a-goog
>