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grub2
grub2-secureboot-add-linuxefi.patch
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File grub2-secureboot-add-linuxefi.patch of Package grub2
From: Matthew Garrett <mjg@redhat.com> Date: 2012-07-10 11:58:52 EDT Subject: [PATCH] Add support for linuxefi References: fate#314485 Patch-Mainline: no Signed-off-by: Michael Chang <mchang@suse.com> v2: Adjust patch according to new upstream commits 4d4a8c96e verifiers: Add possibility to verify kernel and modules command lines ca0a4f689 verifiers: File type for fine-grained signature-verification controlling 7d36709d5 i386: make struct linux_kernel_header architecture specific 4bc909bf8 Remove grub_efi_allocate_pages. v3: The upstream commit df84d6e94 efi: Print error messages to grub_efi_allocate_pages_real() adds grub_error() to set error message and return grub_errno. We have to unset the grub_errno if we want to ignore the error and proceed, or the inadvertently provoked error handler would lead to unspecified consequence. --- grub-core/Makefile.core.def | 8 + grub-core/kern/efi/mm.c | 32 ++++ grub-core/loader/i386/efi/linux.c | 371 +++++++++++++++++++++++++++++++++++++ include/grub/efi/efi.h | 3 + include/grub/i386/linux.h | 1 + 5 files changed, 415 insertions(+), 0 deletions(-) create mode 100644 grub-core/loader/i386/efi/linux.c --- a/grub-core/Makefile.core.def +++ b/grub-core/Makefile.core.def @@ -1920,6 +1920,13 @@ }; module = { + name = linuxefi; + efi = loader/i386/efi/linux.c; + enable = i386_efi; + enable = x86_64_efi; +}; + +module = { name = chain; efi = loader/efi/chainloader.c; i386_pc = loader/i386/pc/chainloader.c; --- a/grub-core/kern/efi/mm.c +++ b/grub-core/kern/efi/mm.c @@ -112,6 +112,38 @@ } } +/* Allocate pages below a specified address */ +void * +grub_efi_allocate_pages_max (grub_efi_physical_address_t max, + grub_efi_uintn_t pages) +{ + grub_efi_status_t status; + grub_efi_boot_services_t *b; + grub_efi_physical_address_t address = max; + + if (max > 0xffffffff) + return 0; + + b = grub_efi_system_table->boot_services; + status = b->allocate_pages (GRUB_EFI_ALLOCATE_MAX_ADDRESS, GRUB_EFI_LOADER_DATA, pages, &address); + + if (status != GRUB_EFI_SUCCESS) + return 0; + + if (address == 0) + { + /* Uggh, the address 0 was allocated... This is too annoying, + so reallocate another one. */ + address = max; + status = b->allocate_pages (GRUB_EFI_ALLOCATE_MAX_ADDRESS, GRUB_EFI_LOADER_DATA, pages, &address); + grub_efi_free_pages (0, pages); + if (status != GRUB_EFI_SUCCESS) + return 0; + } + + return (void *) ((grub_addr_t) address); +} + /* Allocate pages. Return the pointer to the first of allocated pages. */ void * grub_efi_allocate_pages_real (grub_efi_physical_address_t address, --- /dev/null +++ b/grub-core/loader/i386/efi/linux.c @@ -0,0 +1,345 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2012 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <grub/loader.h> +#include <grub/file.h> +#include <grub/err.h> +#include <grub/types.h> +#include <grub/mm.h> +#include <grub/cpu/linux.h> +#include <grub/command.h> +#include <grub/i18n.h> +#include <grub/lib/cmdline.h> +#include <grub/efi/efi.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +static grub_dl_t my_mod; +static int loaded; +static void *kernel_mem; +static grub_uint64_t kernel_size; +static grub_uint8_t *initrd_mem; +static grub_uint32_t handover_offset; +struct linux_kernel_params *params; +static char *linux_cmdline; + +#define BYTES_TO_PAGES(bytes) (((bytes) + 0xfff) >> 12) + +typedef void(*handover_func)(void *, grub_efi_system_table_t *, struct linux_kernel_params *); + +static grub_err_t +grub_linuxefi_boot (void) +{ + handover_func hf; + int offset = 0; + +#ifdef __x86_64__ + offset = 512; +#endif + + hf = (handover_func)((char *)kernel_mem + handover_offset + offset); + + asm volatile ("cli"); + + hf (grub_efi_image_handle, grub_efi_system_table, params); + + /* Not reached */ + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_linuxefi_unload (void) +{ + grub_dl_unref (my_mod); + loaded = 0; + if (initrd_mem) + grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)initrd_mem, BYTES_TO_PAGES(params->ramdisk_size)); + if (linux_cmdline) + grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)linux_cmdline, BYTES_TO_PAGES(params->cmdline_size + 1)); + if (kernel_mem) + grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)kernel_mem, BYTES_TO_PAGES(kernel_size)); + if (params) + grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)params, BYTES_TO_PAGES(16384)); + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + grub_file_t *files = 0; + int i, nfiles = 0; + grub_size_t size = 0; + grub_uint8_t *ptr; + + if (argc == 0) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); + goto fail; + } + + if (!loaded) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("you need to load the kernel first")); + goto fail; + } + + files = grub_zalloc (argc * sizeof (files[0])); + if (!files) + goto fail; + + for (i = 0; i < argc; i++) + { + files[i] = grub_file_open (argv[i], GRUB_FILE_TYPE_LINUX_INITRD + | GRUB_FILE_TYPE_NO_DECOMPRESS); + if (! files[i]) + goto fail; + nfiles++; + size += ALIGN_UP (grub_file_size (files[i]), 4); + } + + initrd_mem = grub_efi_allocate_pages_max (0x3fffffff, BYTES_TO_PAGES(size)); + + if (!initrd_mem) + { + grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate initrd")); + goto fail; + } + + params->ramdisk_size = size; + params->ramdisk_image = (grub_uint32_t)(grub_addr_t) initrd_mem; + + ptr = initrd_mem; + + for (i = 0; i < nfiles; i++) + { + grub_ssize_t cursize = grub_file_size (files[i]); + if (grub_file_read (files[i], ptr, cursize) != cursize) + { + if (!grub_errno) + grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"), + argv[i]); + goto fail; + } + ptr += cursize; + grub_memset (ptr, 0, ALIGN_UP_OVERHEAD (cursize, 4)); + ptr += ALIGN_UP_OVERHEAD (cursize, 4); + } + + params->ramdisk_size = size; + + fail: + for (i = 0; i < nfiles; i++) + grub_file_close (files[i]); + grub_free (files); + + if (initrd_mem && grub_errno) + grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)initrd_mem, BYTES_TO_PAGES(size)); + + return grub_errno; +} + +static grub_err_t +grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + grub_file_t file = 0; + struct linux_i386_kernel_header lh; + grub_ssize_t len, start, filelen; + void *kernel; + grub_err_t err; + + grub_dl_ref (my_mod); + + if (argc == 0) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); + goto fail; + } + + file = grub_file_open (argv[0], GRUB_FILE_TYPE_LINUX_KERNEL); + if (! file) + goto fail; + + filelen = grub_file_size (file); + + kernel = grub_malloc(filelen); + + if (!kernel) + { + grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("cannot allocate kernel buffer")); + goto fail; + } + + if (grub_file_read (file, kernel, filelen) != filelen) + { + grub_error (GRUB_ERR_FILE_READ_ERROR, N_("Can't read kernel %s"), argv[0]); + goto fail; + } + + grub_file_seek (file, 0); + + grub_free(kernel); + + params = grub_efi_allocate_pages_max (0x3fffffff, BYTES_TO_PAGES(16384)); + + if (! params) + { + grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate kernel parameters"); + goto fail; + } + + grub_memset (params, 0, 16384); + + if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh)) + { + if (!grub_errno) + grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), + argv[0]); + goto fail; + } + + if (lh.boot_flag != grub_cpu_to_le16 (0xaa55)) + { + grub_error (GRUB_ERR_BAD_OS, N_("invalid magic number")); + goto fail; + } + + if (lh.setup_sects > GRUB_LINUX_MAX_SETUP_SECTS) + { + grub_error (GRUB_ERR_BAD_OS, N_("too many setup sectors")); + goto fail; + } + + if (lh.version < grub_cpu_to_le16 (0x020b)) + { + grub_error (GRUB_ERR_BAD_OS, N_("kernel too old")); + goto fail; + } + + if (!lh.handover_offset) + { + grub_error (GRUB_ERR_BAD_OS, N_("kernel doesn't support EFI handover")); + goto fail; + } + + linux_cmdline = grub_efi_allocate_pages_max(0x3fffffff, + BYTES_TO_PAGES(lh.cmdline_size + 1)); + + if (!linux_cmdline) + { + grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate cmdline")); + goto fail; + } + + grub_memcpy (linux_cmdline, LINUX_IMAGE, sizeof (LINUX_IMAGE)); + err = grub_create_loader_cmdline (argc, argv, + linux_cmdline + sizeof (LINUX_IMAGE) - 1, + lh.cmdline_size - (sizeof (LINUX_IMAGE) - 1), + GRUB_VERIFY_KERNEL_CMDLINE); + if (err) + goto fail; + + lh.cmd_line_ptr = (grub_uint32_t)(grub_addr_t)linux_cmdline; + + handover_offset = lh.handover_offset; + + start = (lh.setup_sects + 1) * 512; + len = grub_file_size(file) - start; + + kernel_mem = grub_efi_allocate_fixed (lh.pref_address, + BYTES_TO_PAGES(lh.init_size)); + + if (!kernel_mem) + { + grub_errno = GRUB_ERR_NONE; + kernel_mem = grub_efi_allocate_pages_max(0x3fffffff, + BYTES_TO_PAGES(lh.init_size)); + } + + if (!kernel_mem) + { + grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate kernel")); + goto fail; + } + + if (grub_file_seek (file, start) == (grub_off_t) -1) + { + grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), + argv[0]); + goto fail; + } + + if (grub_file_read (file, kernel_mem, len) != len && !grub_errno) + { + grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), + argv[0]); + } + + if (grub_errno == GRUB_ERR_NONE) + { + grub_loader_set (grub_linuxefi_boot, grub_linuxefi_unload, 0); + loaded = 1; + lh.code32_start = (grub_uint32_t)(grub_addr_t) kernel_mem; + } + + grub_memcpy(params, &lh, 2 * 512); + + params->type_of_loader = 0x21; + + fail: + + if (file) + grub_file_close (file); + + if (grub_errno != GRUB_ERR_NONE) + { + grub_dl_unref (my_mod); + loaded = 0; + } + + if (linux_cmdline && !loaded) + grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)linux_cmdline, BYTES_TO_PAGES(lh.cmdline_size + 1)); + + if (kernel_mem && !loaded) + grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)kernel_mem, BYTES_TO_PAGES(kernel_size)); + + if (params && !loaded) + grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)params, BYTES_TO_PAGES(16384)); + + return grub_errno; +} + +static grub_command_t cmd_linux, cmd_initrd; + +GRUB_MOD_INIT(linuxefi) +{ + cmd_linux = + grub_register_command ("linuxefi", grub_cmd_linux, + 0, N_("Load Linux.")); + cmd_initrd = + grub_register_command ("initrdefi", grub_cmd_initrd, + 0, N_("Load initrd.")); + my_mod = mod; +} + +GRUB_MOD_FINI(linuxefi) +{ + grub_unregister_command (cmd_linux); + grub_unregister_command (cmd_initrd); +} --- a/include/grub/efi/efi.h +++ b/include/grub/efi/efi.h @@ -61,6 +61,9 @@ grub_efi_uintn_t pages); void * EXPORT_FUNC(grub_efi_allocate_any_pages) (grub_efi_uintn_t pages); +void * +EXPORT_FUNC(grub_efi_allocate_pages_max) (grub_efi_physical_address_t max, + grub_efi_uintn_t pages); void EXPORT_FUNC(grub_efi_free_pages) (grub_efi_physical_address_t address, grub_efi_uintn_t pages); grub_efi_uintn_t EXPORT_FUNC(grub_efi_find_mmap_size) (void);
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