diff options
Diffstat (limited to 'grub-core/commands/file.c')
| -rw-r--r-- | grub-core/commands/file.c | 694 |
1 files changed, 694 insertions, 0 deletions
diff --git a/grub-core/commands/file.c b/grub-core/commands/file.c new file mode 100644 index 0000000..9de0006 --- /dev/null +++ b/grub-core/commands/file.c @@ -0,0 +1,694 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2013 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/dl.h> +#include <grub/misc.h> +#include <grub/mm.h> +#include <grub/env.h> +#include <grub/command.h> +#include <grub/extcmd.h> +#include <grub/i18n.h> +#include <grub/file.h> +#include <grub/elf.h> +#include <grub/xen_file.h> +#include <grub/efi/pe32.h> +#include <grub/arm/linux.h> +#include <grub/arm64/linux.h> +#include <grub/i386/linux.h> +#include <grub/xnu.h> +#include <grub/machoload.h> +#include <grub/fileid.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +static const struct grub_arg_option options[] = { + {"is-i386-xen-pae-domu", 0, 0, + N_("Check if FILE can be booted as i386 PAE Xen unprivileged guest kernel"), + 0, 0}, + {"is-x86_64-xen-domu", 0, 0, + N_("Check if FILE can be booted as x86_64 Xen unprivileged guest kernel"), 0, 0}, + {"is-x86-xen-dom0", 0, 0, + N_("Check if FILE can be used as Xen x86 privileged guest kernel"), 0, 0}, + {"is-x86-multiboot", 0, 0, + N_("Check if FILE can be used as x86 multiboot kernel"), 0, 0}, + {"is-x86-multiboot2", 0, 0, + N_("Check if FILE can be used as x86 multiboot2 kernel"), 0, 0}, + {"is-arm-linux", 0, 0, + N_("Check if FILE is ARM Linux"), 0, 0}, + {"is-arm64-linux", 0, 0, + N_("Check if FILE is ARM64 Linux"), 0, 0}, + {"is-ia64-linux", 0, 0, + N_("Check if FILE is IA64 Linux"), 0, 0}, + {"is-mips-linux", 0, 0, + N_("Check if FILE is MIPS Linux"), 0, 0}, + {"is-mipsel-linux", 0, 0, + N_("Check if FILE is MIPSEL Linux"), 0, 0}, + {"is-sparc64-linux", 0, 0, + N_("Check if FILE is SPARC64 Linux"), 0, 0}, + {"is-powerpc-linux", 0, 0, + N_("Check if FILE is POWERPC Linux"), 0, 0}, + {"is-x86-linux", 0, 0, + N_("Check if FILE is x86 Linux"), 0, 0}, + {"is-x86-linux32", 0, 0, + N_("Check if FILE is x86 Linux supporting 32-bit protocol"), 0, 0}, + {"is-x86-kfreebsd", 0, 0, + N_("Check if FILE is x86 kFreeBSD"), 0, 0}, + {"is-i386-kfreebsd", 0, 0, + N_("Check if FILE is i386 kFreeBSD"), 0, 0}, + {"is-x86_64-kfreebsd", 0, 0, + N_("Check if FILE is x86_64 kFreeBSD"), 0, 0}, + + {"is-x86-knetbsd", 0, 0, + N_("Check if FILE is x86 kNetBSD"), 0, 0}, + {"is-i386-knetbsd", 0, 0, + N_("Check if FILE is i386 kNetBSD"), 0, 0}, + {"is-x86_64-knetbsd", 0, 0, + N_("Check if FILE is x86_64 kNetBSD"), 0, 0}, + + {"is-i386-efi", 0, 0, + N_("Check if FILE is i386 EFI file"), 0, 0}, + {"is-x86_64-efi", 0, 0, + N_("Check if FILE is x86_64 EFI file"), 0, 0}, + {"is-ia64-efi", 0, 0, + N_("Check if FILE is IA64 EFI file"), 0, 0}, + {"is-arm64-efi", 0, 0, + N_("Check if FILE is ARM64 EFI file"), 0, 0}, + {"is-arm-efi", 0, 0, + N_("Check if FILE is ARM EFI file"), 0, 0}, + {"is-riscv32-efi", 0, 0, + N_("Check if FILE is RISC-V 32bit EFI file"), 0, 0}, + {"is-riscv64-efi", 0, 0, + N_("Check if FILE is RISC-V 64bit EFI file"), 0, 0}, + {"is-hibernated-hiberfil", 0, 0, + N_("Check if FILE is hiberfil.sys in hibernated state"), 0, 0}, + {"is-x86_64-xnu", 0, 0, + N_("Check if FILE is x86_64 XNU (Mac OS X kernel)"), 0, 0}, + {"is-i386-xnu", 0, 0, + N_("Check if FILE is i386 XNU (Mac OS X kernel)"), 0, 0}, + {"is-xnu-hibr", 0, 0, + N_("Check if FILE is XNU (Mac OS X kernel) hibernated image"), 0, 0}, + {"is-x86-bios-bootsector", 0, 0, + N_("Check if FILE is BIOS bootsector"), 0, 0}, + {0, 0, 0, 0, 0, 0} +}; + +enum +{ + IS_PAE_DOMU, + IS_64_DOMU, + IS_DOM0, + IS_MULTIBOOT, + IS_MULTIBOOT2, + IS_ARM_LINUX, + IS_ARM64_LINUX, + IS_IA64_LINUX, + IS_MIPS_LINUX, + IS_MIPSEL_LINUX, + IS_SPARC64_LINUX, + IS_POWERPC_LINUX, + IS_X86_LINUX, + IS_X86_LINUX32, + IS_X86_KFREEBSD, + IS_X86_KFREEBSD32, + IS_X86_KFREEBSD64, + IS_X86_KNETBSD, + IS_X86_KNETBSD32, + IS_X86_KNETBSD64, + IS_32_EFI, + IS_64_EFI, + IS_IA_EFI, + IS_ARM64_EFI, + IS_ARM_EFI, + IS_RISCV32_EFI, + IS_RISCV64_EFI, + IS_HIBERNATED, + IS_XNU64, + IS_XNU32, + IS_XNU_HIBR, + IS_BIOS_BOOTSECTOR, + OPT_TYPE_MIN = IS_PAE_DOMU, + OPT_TYPE_MAX = IS_BIOS_BOOTSECTOR +}; + + +static grub_err_t +grub_cmd_file (grub_extcmd_context_t ctxt, int argc, char **args) +{ + grub_file_t file = 0; + grub_elf_t elf = 0; + grub_err_t err; + int type = -1, i; + int ret = 0; + grub_macho_t macho = 0; + + if (argc == 0) + return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); + for (i = OPT_TYPE_MIN; i <= OPT_TYPE_MAX; i++) + if (ctxt->state[i].set) + { + if (type == -1) + { + type = i; + continue; + } + return grub_error (GRUB_ERR_BAD_ARGUMENT, "multiple types specified"); + } + if (type == -1) + return grub_error (GRUB_ERR_BAD_ARGUMENT, "no type specified"); + + file = grub_file_open (args[0], GRUB_FILE_TYPE_XNU_KERNEL); + if (!file) + return grub_errno; + switch (type) + { + case IS_BIOS_BOOTSECTOR: + { + grub_uint16_t sig; + if (grub_file_size (file) != 512) + break; + if (grub_file_seek (file, 510) == (grub_size_t) -1) + break; + if (grub_file_read (file, &sig, 2) != 2) + break; + if (sig != grub_cpu_to_le16_compile_time (0xaa55)) + break; + ret = 1; + break; + } + case IS_IA64_LINUX: + { + Elf64_Ehdr ehdr; + + if (grub_file_read (file, &ehdr, sizeof (ehdr)) != sizeof (ehdr)) + break; + + if (ehdr.e_ident[EI_MAG0] != ELFMAG0 + || ehdr.e_ident[EI_MAG1] != ELFMAG1 + || ehdr.e_ident[EI_MAG2] != ELFMAG2 + || ehdr.e_ident[EI_MAG3] != ELFMAG3 + || ehdr.e_ident[EI_VERSION] != EV_CURRENT + || ehdr.e_version != EV_CURRENT) + break; + + if (ehdr.e_ident[EI_CLASS] != ELFCLASS64 + || ehdr.e_ident[EI_DATA] != ELFDATA2LSB + || ehdr.e_machine != grub_cpu_to_le16_compile_time (EM_IA_64)) + break; + + ret = 1; + + break; + } + + case IS_SPARC64_LINUX: + { + Elf64_Ehdr ehdr; + + if (grub_file_read (file, &ehdr, sizeof (ehdr)) != sizeof (ehdr)) + break; + + if (ehdr.e_ident[EI_MAG0] != ELFMAG0 + || ehdr.e_ident[EI_MAG1] != ELFMAG1 + || ehdr.e_ident[EI_MAG2] != ELFMAG2 + || ehdr.e_ident[EI_MAG3] != ELFMAG3 + || ehdr.e_ident[EI_VERSION] != EV_CURRENT + || ehdr.e_version != EV_CURRENT) + break; + + if (ehdr.e_ident[EI_CLASS] != ELFCLASS64 + || ehdr.e_ident[EI_DATA] != ELFDATA2MSB) + break; + + if (ehdr.e_machine != grub_cpu_to_le16_compile_time (EM_SPARCV9) + || ehdr.e_type != grub_cpu_to_be16_compile_time (ET_EXEC)) + break; + + ret = 1; + + break; + } + + case IS_POWERPC_LINUX: + { + Elf32_Ehdr ehdr; + + if (grub_file_read (file, &ehdr, sizeof (ehdr)) != sizeof (ehdr)) + break; + + if (ehdr.e_ident[EI_MAG0] != ELFMAG0 + || ehdr.e_ident[EI_MAG1] != ELFMAG1 + || ehdr.e_ident[EI_MAG2] != ELFMAG2 + || ehdr.e_ident[EI_MAG3] != ELFMAG3 + || ehdr.e_ident[EI_VERSION] != EV_CURRENT + || ehdr.e_version != EV_CURRENT) + break; + + if (ehdr.e_ident[EI_DATA] != ELFDATA2MSB + || (ehdr.e_machine != grub_cpu_to_le16_compile_time (EM_PPC) + && ehdr.e_machine != + grub_cpu_to_le16_compile_time (EM_PPC64))) + break; + + if (ehdr.e_type != grub_cpu_to_be16_compile_time (ET_EXEC) + && ehdr.e_type != grub_cpu_to_be16_compile_time (ET_DYN)) + break; + + ret = 1; + + break; + } + + case IS_MIPS_LINUX: + { + Elf32_Ehdr ehdr; + + if (grub_file_read (file, &ehdr, sizeof (ehdr)) != sizeof (ehdr)) + break; + + if (ehdr.e_ident[EI_MAG0] != ELFMAG0 + || ehdr.e_ident[EI_MAG1] != ELFMAG1 + || ehdr.e_ident[EI_MAG2] != ELFMAG2 + || ehdr.e_ident[EI_MAG3] != ELFMAG3 + || ehdr.e_ident[EI_VERSION] != EV_CURRENT + || ehdr.e_version != EV_CURRENT) + break; + + if (ehdr.e_ident[EI_DATA] != ELFDATA2MSB + || ehdr.e_machine != grub_cpu_to_be16_compile_time (EM_MIPS) + || ehdr.e_type != grub_cpu_to_be16_compile_time (ET_EXEC)) + break; + + ret = 1; + + break; + } + + case IS_X86_KNETBSD: + case IS_X86_KNETBSD32: + case IS_X86_KNETBSD64: + { + int is32, is64; + + elf = grub_elf_file (file, file->name); + + if (elf->ehdr.ehdr32.e_type != grub_cpu_to_le16_compile_time (ET_EXEC) + || elf->ehdr.ehdr32.e_ident[EI_DATA] != ELFDATA2LSB) + break; + + is32 = grub_elf_is_elf32 (elf); + is64 = grub_elf_is_elf64 (elf); + if (!is32 && !is64) + break; + if (!is32 && type == IS_X86_KNETBSD32) + break; + if (!is64 && type == IS_X86_KNETBSD64) + break; + if (is64) + ret = grub_file_check_netbsd64 (elf); + if (is32) + ret = grub_file_check_netbsd32 (elf); + break; + } + + case IS_X86_KFREEBSD: + case IS_X86_KFREEBSD32: + case IS_X86_KFREEBSD64: + { + Elf32_Ehdr ehdr; + int is32, is64; + + if (grub_file_read (file, &ehdr, sizeof (ehdr)) != sizeof (ehdr)) + break; + + if (ehdr.e_ident[EI_MAG0] != ELFMAG0 + || ehdr.e_ident[EI_MAG1] != ELFMAG1 + || ehdr.e_ident[EI_MAG2] != ELFMAG2 + || ehdr.e_ident[EI_MAG3] != ELFMAG3 + || ehdr.e_ident[EI_VERSION] != EV_CURRENT + || ehdr.e_version != EV_CURRENT) + break; + + if (ehdr.e_type != grub_cpu_to_le16_compile_time (ET_EXEC) + || ehdr.e_ident[EI_DATA] != ELFDATA2LSB) + break; + + if (ehdr.e_ident[EI_OSABI] != ELFOSABI_FREEBSD) + break; + + is32 = (ehdr.e_machine == grub_cpu_to_le16_compile_time (EM_386) + && ehdr.e_ident[EI_CLASS] == ELFCLASS32); + is64 = (ehdr.e_machine == grub_cpu_to_le16_compile_time (EM_X86_64) + && ehdr.e_ident[EI_CLASS] == ELFCLASS64); + if (!is32 && !is64) + break; + if (!is32 && (type == IS_X86_KFREEBSD32 || type == IS_X86_KNETBSD32)) + break; + if (!is64 && (type == IS_X86_KFREEBSD64 || type == IS_X86_KNETBSD64)) + break; + ret = 1; + + break; + } + + + case IS_MIPSEL_LINUX: + { + Elf32_Ehdr ehdr; + + if (grub_file_read (file, &ehdr, sizeof (ehdr)) != sizeof (ehdr)) + break; + + if (ehdr.e_ident[EI_MAG0] != ELFMAG0 + || ehdr.e_ident[EI_MAG1] != ELFMAG1 + || ehdr.e_ident[EI_MAG2] != ELFMAG2 + || ehdr.e_ident[EI_MAG3] != ELFMAG3 + || ehdr.e_ident[EI_VERSION] != EV_CURRENT + || ehdr.e_version != EV_CURRENT) + break; + + if (ehdr.e_machine != grub_cpu_to_le16_compile_time (EM_MIPS) + || ehdr.e_type != grub_cpu_to_le16_compile_time (ET_EXEC)) + break; + + ret = 1; + + break; + } + case IS_ARM_LINUX: + { + struct linux_arm_kernel_header lh; + + if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh)) + break; + /* Short forward branch in A32 state (for Raspberry pi kernels). */ + if (lh.code0 == grub_cpu_to_le32_compile_time (0xea000006)) + { + ret = 1; + break; + } + + if (lh.magic == + grub_cpu_to_le32_compile_time (GRUB_LINUX_ARM_MAGIC_SIGNATURE)) + { + ret = 1; + break; + } + break; + } + case IS_ARM64_LINUX: + { + struct linux_arm64_kernel_header lh; + + if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh)) + break; + + if (lh.magic == + grub_cpu_to_le32_compile_time (GRUB_LINUX_ARM64_MAGIC_SIGNATURE)) + { + ret = 1; + break; + } + break; + } + case IS_PAE_DOMU ... IS_DOM0: + { + struct grub_xen_file_info xen_inf; + elf = grub_xen_file (file); + if (!elf) + break; + err = grub_xen_get_info (elf, &xen_inf); + if (err) + break; + /* Unfortuntely no way to check if kernel supports dom0. */ + if (type == IS_DOM0) + ret = 1; + if (type == IS_PAE_DOMU) + ret = (xen_inf.arch == GRUB_XEN_FILE_I386_PAE + || xen_inf.arch == GRUB_XEN_FILE_I386_PAE_BIMODE); + if (type == IS_64_DOMU) + ret = (xen_inf.arch == GRUB_XEN_FILE_X86_64); + break; + } + case IS_MULTIBOOT: + case IS_MULTIBOOT2: + { + grub_uint32_t *buffer; + grub_ssize_t len; + grub_size_t search_size; + grub_uint32_t *header; + grub_uint32_t magic; + grub_size_t step; + + if (type == IS_MULTIBOOT2) + { + search_size = 32768; + magic = grub_cpu_to_le32_compile_time (0xe85250d6); + step = 2; + } + else + { + search_size = 8192; + magic = grub_cpu_to_le32_compile_time (0x1BADB002); + step = 1; + } + + buffer = grub_malloc (search_size); + if (!buffer) + break; + + len = grub_file_read (file, buffer, search_size); + if (len < 32) + { + grub_free (buffer); + break; + } + + /* Look for the multiboot header in the buffer. The header should + be at least 12 bytes and aligned on a 4-byte boundary. */ + for (header = buffer; + ((char *) header <= + (char *) buffer + len - (type == IS_MULTIBOOT2 ? 16 : 12)); + header += step) + { + if (header[0] == magic + && !(grub_le_to_cpu32 (header[0]) + + grub_le_to_cpu32 (header[1]) + + grub_le_to_cpu32 (header[2]) + + (type == IS_MULTIBOOT2 + ? grub_le_to_cpu32 (header[3]) : 0))) + { + ret = 1; + break; + } + } + + grub_free (buffer); + break; + } + case IS_X86_LINUX32: + case IS_X86_LINUX: + { + struct linux_i386_kernel_header lh; + if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh)) + break; + if (lh.boot_flag != grub_cpu_to_le16_compile_time (0xaa55)) + break; + + if (lh.setup_sects > GRUB_LINUX_MAX_SETUP_SECTS) + break; + + /* FIXME: some really old kernels (< 1.3.73) will fail this. */ + if (lh.header != + grub_cpu_to_le32_compile_time (GRUB_LINUX_I386_MAGIC_SIGNATURE) + || grub_le_to_cpu16 (lh.version) < 0x0200) + break; + + if (type == IS_X86_LINUX) + { + ret = 1; + break; + } + + /* FIXME: 2.03 is not always good enough (Linux 2.4 can be 2.03 and + still not support 32-bit boot. */ + if (lh.header != + grub_cpu_to_le32_compile_time (GRUB_LINUX_I386_MAGIC_SIGNATURE) + || grub_le_to_cpu16 (lh.version) < 0x0203) + break; + + if (!(lh.loadflags & GRUB_LINUX_FLAG_BIG_KERNEL)) + break; + ret = 1; + break; + } + case IS_HIBERNATED: + { + grub_uint8_t hibr_file_magic[4]; + if (grub_file_read (file, &hibr_file_magic, sizeof (hibr_file_magic)) + != sizeof (hibr_file_magic)) + break; + if (grub_memcmp ("hibr", hibr_file_magic, sizeof (hibr_file_magic)) == + 0 + || grub_memcmp ("HIBR", hibr_file_magic, + sizeof (hibr_file_magic)) == 0) + ret = 1; + break; + } + case IS_XNU64: + case IS_XNU32: + { + macho = grub_macho_open (args[0], GRUB_FILE_TYPE_XNU_KERNEL, + (type == IS_XNU64)); + if (!macho) + break; + /* FIXME: more checks? */ + ret = 1; + break; + } + case IS_XNU_HIBR: + { + struct grub_xnu_hibernate_header hibhead; + if (grub_file_read (file, &hibhead, sizeof (hibhead)) + != sizeof (hibhead)) + break; + if (hibhead.magic != + grub_cpu_to_le32_compile_time (GRUB_XNU_HIBERNATE_MAGIC)) + break; + ret = 1; + break; + } + case IS_32_EFI: + case IS_64_EFI: + case IS_IA_EFI: + case IS_ARM64_EFI: + case IS_ARM_EFI: + case IS_RISCV32_EFI: + case IS_RISCV64_EFI: + { + char signature[4]; + grub_uint32_t pe_offset; + struct grub_pe32_coff_header coff_head; + + if (grub_file_read (file, signature, 2) != 2) + break; + if (signature[0] != 'M' || signature[1] != 'Z') + break; + if ((grub_ssize_t) grub_file_seek (file, 0x3c) == -1) + break; + if (grub_file_read (file, &pe_offset, 4) != 4) + break; + if ((grub_ssize_t) grub_file_seek (file, grub_le_to_cpu32 (pe_offset)) + == -1) + break; + if (grub_file_read (file, signature, 4) != 4) + break; + if (signature[0] != 'P' || signature[1] != 'E' + || signature[2] != '\0' || signature[3] != '\0') + break; + + if (grub_file_read (file, &coff_head, sizeof (coff_head)) + != sizeof (coff_head)) + break; + if (type == IS_32_EFI + && coff_head.machine != + grub_cpu_to_le16_compile_time (GRUB_PE32_MACHINE_I386)) + break; + if (type == IS_64_EFI + && coff_head.machine != + grub_cpu_to_le16_compile_time (GRUB_PE32_MACHINE_X86_64)) + break; + if (type == IS_IA_EFI + && coff_head.machine != + grub_cpu_to_le16_compile_time (GRUB_PE32_MACHINE_IA64)) + break; + if (type == IS_ARM64_EFI + && coff_head.machine != + grub_cpu_to_le16_compile_time (GRUB_PE32_MACHINE_ARM64)) + break; + if (type == IS_ARM_EFI + && coff_head.machine != + grub_cpu_to_le16_compile_time (GRUB_PE32_MACHINE_ARMTHUMB_MIXED)) + break; + if ((type == IS_RISCV32_EFI || type == IS_RISCV64_EFI) + && coff_head.machine != + grub_cpu_to_le16_compile_time (GRUB_PE32_MACHINE_RISCV64)) + /* TODO: Determine bitness dynamically */ + break; + if (type == IS_IA_EFI || type == IS_64_EFI || type == IS_ARM64_EFI || + type == IS_RISCV32_EFI || type == IS_RISCV64_EFI) + { + struct grub_pe64_optional_header o64; + if (grub_file_read (file, &o64, sizeof (o64)) != sizeof (o64)) + break; + if (o64.magic != + grub_cpu_to_le16_compile_time (GRUB_PE32_PE64_MAGIC)) + break; + if (o64.subsystem != + grub_cpu_to_le16_compile_time + (GRUB_PE32_SUBSYSTEM_EFI_APPLICATION)) + break; + ret = 1; + break; + } + if (type == IS_32_EFI || type == IS_ARM_EFI) + { + struct grub_pe32_optional_header o32; + if (grub_file_read (file, &o32, sizeof (o32)) != sizeof (o32)) + break; + if (o32.magic != + grub_cpu_to_le16_compile_time (GRUB_PE32_PE32_MAGIC)) + break; + if (o32.subsystem != + grub_cpu_to_le16_compile_time + (GRUB_PE32_SUBSYSTEM_EFI_APPLICATION)) + break; + ret = 1; + break; + } + break; + } + } + + if (elf) + grub_elf_close (elf); + else if (macho) + grub_macho_close (macho); + else if (file) + grub_file_close (file); + + if (!ret && (grub_errno == GRUB_ERR_BAD_OS || grub_errno == GRUB_ERR_NONE)) + /* TRANSLATORS: it's a standalone boolean value, + opposite of "true". */ + grub_error (GRUB_ERR_TEST_FAILURE, N_("false")); + return grub_errno; +} + +static grub_extcmd_t cmd; + +GRUB_MOD_INIT(file) +{ + cmd = grub_register_extcmd ("file", grub_cmd_file, 0, + N_("OPTIONS FILE"), + N_("Check if FILE is of specified type."), + options); +} + +GRUB_MOD_FINI(file) +{ + grub_unregister_extcmd (cmd); +} |