From 97bb9cdc32108036170d9d0d208257168f80d9e9 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Mon, 13 Jan 2020 18:22:38 +0100 Subject: efi/x86: Avoid RWX mappings for all of DRAM The EFI code creates RWX mappings for all memory regions that are occupied after the stub completes, and in the mixed mode case, it even creates RWX mappings for all of the remaining DRAM as well. Let's try to avoid this, by setting the NX bit for all memory regions except the ones that are marked as EFI runtime services code [which means text+rodata+data in practice, so we cannot mark them read-only right away]. For cases of buggy firmware where boot services code is called during SetVirtualAddressMap(), map those regions with exec permissions as well - they will be unmapped in efi_free_boot_services(). Signed-off-by: Ard Biesheuvel Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20200113172245.27925-7-ardb@kernel.org --- arch/x86/platform/efi/efi_64.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) (limited to 'arch') diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c index 6ec58ff60b56..3eb23966e30a 100644 --- a/arch/x86/platform/efi/efi_64.c +++ b/arch/x86/platform/efi/efi_64.c @@ -365,10 +365,6 @@ int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) * as trim_bios_range() will reserve the first page and isolate it away * from memory allocators anyway. */ - pf = _PAGE_RW; - if (sev_active()) - pf |= _PAGE_ENC; - if (kernel_map_pages_in_pgd(pgd, 0x0, 0x0, 1, pf)) { pr_err("Failed to create 1:1 mapping for the first page!\n"); return 1; @@ -410,6 +406,22 @@ static void __init __map_region(efi_memory_desc_t *md, u64 va) unsigned long pfn; pgd_t *pgd = efi_mm.pgd; + /* + * EFI_RUNTIME_SERVICES_CODE regions typically cover PE/COFF + * executable images in memory that consist of both R-X and + * RW- sections, so we cannot apply read-only or non-exec + * permissions just yet. However, modern EFI systems provide + * a memory attributes table that describes those sections + * with the appropriate restricted permissions, which are + * applied in efi_runtime_update_mappings() below. All other + * regions can be mapped non-executable at this point, with + * the exception of boot services code regions, but those will + * be unmapped again entirely in efi_free_boot_services(). + */ + if (md->type != EFI_BOOT_SERVICES_CODE && + md->type != EFI_RUNTIME_SERVICES_CODE) + flags |= _PAGE_NX; + if (!(md->attribute & EFI_MEMORY_WB)) flags |= _PAGE_PCD; -- cgit 1.4.1