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

jeffxu@chromium.org posted 7 patches 11 months, 1 week ago
There is a newer version of this series
[PATCH v8 3/7] mseal sysmap: enable x86-64
Posted by jeffxu@chromium.org 11 months, 1 week ago 
From: Jeff Xu <jeffxu@chromium.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@chromium.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
Re: [PATCH v8 3/7] mseal sysmap: enable x86-64
Posted by Kees Cook 11 months, 1 week ago 
On Mon, Mar 03, 2025 at 05:09:17AM +0000, jeffxu@chromium.org wrote:
> From: Jeff Xu <jeffxu@chromium.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@chromium.org>

Short and to the point. :)

Reviewed-by: Kees Cook <kees@kernel.org>

-- 
Kees Cook
Re: [PATCH v8 3/7] mseal sysmap: enable x86-64
Posted by Liam R. Howlett 11 months, 1 week ago 
* jeffxu@chromium.org <jeffxu@chromium.org> [250303 00:09]:
> From: Jeff Xu <jeffxu@chromium.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@chromium.org>

Thanks, this is much cleaner.

Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>

> ---
>  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
>
Re: [PATCH v8 3/7] mseal sysmap: enable x86-64
Posted by Lorenzo Stoakes 11 months, 1 week ago 
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@chromium.org wrote:
> From: Jeff Xu <jeffxu@chromium.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@chromium.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
>
Re: [PATCH v8 3/7] mseal sysmap: enable x86-64
Posted by Jeff Xu 11 months, 1 week ago 
On Mon, Mar 3, 2025 at 4:01 AM Lorenzo Stoakes
<lorenzo.stoakes@oracle.com> wrote:
>
> 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.
>
This version is based on linux-main, if that helps resolving the conflict.

I can also rebase using the mm-(unstable/stable) branch or other
branches if asked.

Thanks
-Jeff


> On Mon, Mar 03, 2025 at 05:09:17AM +0000, jeffxu@chromium.org wrote:
> > From: Jeff Xu <jeffxu@chromium.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@chromium.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
> >
Re: [PATCH v8 3/7] mseal sysmap: enable x86-64
Posted by Lorenzo Stoakes 11 months, 1 week ago 
On Mon, Mar 03, 2025 at 05:09:17AM +0000, jeffxu@chromium.org wrote:
> From: Jeff Xu <jeffxu@chromium.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@chromium.org>

LGTM, so:

Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>

> ---
>  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
>

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