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 Reviewed-by: Lorenzo Stoakes lorenzo.stoakes@oracle.com Reviewed-by: Liam R. Howlett Liam.Howlett@oracle.com Reviewed-by: Kees Cook kees@kernel.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)) {