The following commit has been merged into the efi/urgent branch of tip:
Commit-ID: c8502eb2d43b6b9b1dc382299a4d37031be63876 Gitweb: https://git.kernel.org/tip/c8502eb2d43b6b9b1dc382299a4d37031be63876 Author: Arvind Sankar nivedita@alum.mit.edu AuthorDate: Fri, 17 Jul 2020 15:45:26 -04:00 Committer: Ard Biesheuvel ardb@kernel.org CommitterDate: Thu, 20 Aug 2020 11:18:36 +02:00
efi/x86: Mark kernel rodata non-executable for mixed mode
When remapping the kernel rodata section RO in the EFI pagetables, the protection flags that were used for the text section are being reused, but the rodata section should not be marked executable.
Cc: stable@vger.kernel.org Signed-off-by: Arvind Sankar nivedita@alum.mit.edu Link: https://lore.kernel.org/r/20200717194526.3452089-1-nivedita@alum.mit.edu Signed-off-by: Ard Biesheuvel ardb@kernel.org --- arch/x86/platform/efi/efi_64.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c index 413583f..6af4da1 100644 --- a/arch/x86/platform/efi/efi_64.c +++ b/arch/x86/platform/efi/efi_64.c @@ -259,6 +259,8 @@ int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) npages = (__end_rodata - __start_rodata) >> PAGE_SHIFT; rodata = __pa(__start_rodata); pfn = rodata >> PAGE_SHIFT; + + pf = _PAGE_NX | _PAGE_ENC; if (kernel_map_pages_in_pgd(pgd, pfn, rodata, npages, pf)) { pr_err("Failed to map kernel rodata 1:1\n"); return 1;