From: Jeff Xu jeffxu@chromium.org
Provide support for CONFIG_MSEAL_SYSTEM_MAPPINGS on arm64, covering the vdso, vvar, and compat-mode vectors and sigpage mappings.
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/arm64/Kconfig | 1 + arch/arm64/kernel/vdso.c | 12 ++++++++---- 2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 940343beb3d4..282d6cb13cfb 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -38,6 +38,7 @@ config ARM64 select ARCH_HAS_KEEPINITRD select ARCH_HAS_MEMBARRIER_SYNC_CORE select ARCH_HAS_MEM_ENCRYPT + select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_NONLEAF_PMD_YOUNG if ARM64_HAFT diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c index e8ed8e5b713b..69d2b5ceb092 100644 --- a/arch/arm64/kernel/vdso.c +++ b/arch/arm64/kernel/vdso.c @@ -198,7 +198,8 @@ static int __setup_additional_pages(enum vdso_abi abi, }
ret = _install_special_mapping(mm, vdso_base, VVAR_NR_PAGES * PAGE_SIZE, - VM_READ|VM_MAYREAD|VM_PFNMAP, + VM_READ|VM_MAYREAD|VM_PFNMAP| + VM_SEALED_SYSMAP, &vvar_map); if (IS_ERR(ret)) goto up_fail; @@ -210,7 +211,8 @@ static int __setup_additional_pages(enum vdso_abi abi, mm->context.vdso = (void *)vdso_base; ret = _install_special_mapping(mm, vdso_base, vdso_text_len, VM_READ|VM_EXEC|gp_flags| - VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, + VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC| + VM_SEALED_SYSMAP, vdso_info[abi].cm); if (IS_ERR(ret)) goto up_fail; @@ -336,7 +338,8 @@ static int aarch32_kuser_helpers_setup(struct mm_struct *mm) */ ret = _install_special_mapping(mm, AARCH32_VECTORS_BASE, PAGE_SIZE, VM_READ | VM_EXEC | - VM_MAYREAD | VM_MAYEXEC, + VM_MAYREAD | VM_MAYEXEC | + VM_SEALED_SYSMAP, &aarch32_vdso_maps[AA32_MAP_VECTORS]);
return PTR_ERR_OR_ZERO(ret); @@ -359,7 +362,8 @@ static int aarch32_sigreturn_setup(struct mm_struct *mm) */ ret = _install_special_mapping(mm, addr, PAGE_SIZE, VM_READ | VM_EXEC | VM_MAYREAD | - VM_MAYWRITE | VM_MAYEXEC, + VM_MAYWRITE | VM_MAYEXEC | + VM_SEALED_SYSMAP, &aarch32_vdso_maps[AA32_MAP_SIGPAGE]); if (IS_ERR(ret)) goto out;