diff options
Diffstat (limited to 'drivers/firmware')
-rw-r--r-- | drivers/firmware/efi/Kconfig | 41 | ||||
-rw-r--r-- | drivers/firmware/efi/libstub/Makefile | 11 | ||||
-rw-r--r-- | drivers/firmware/efi/libstub/Makefile.zboot | 70 | ||||
-rw-r--r-- | drivers/firmware/efi/libstub/efi-stub-helper.c | 17 | ||||
-rw-r--r-- | drivers/firmware/efi/libstub/efi-stub.c | 2 | ||||
-rw-r--r-- | drivers/firmware/efi/libstub/efistub.h | 39 | ||||
-rw-r--r-- | drivers/firmware/efi/libstub/file.c | 20 | ||||
-rw-r--r-- | drivers/firmware/efi/libstub/intrinsics.c | 30 | ||||
-rw-r--r-- | drivers/firmware/efi/libstub/systable.c | 8 | ||||
-rw-r--r-- | drivers/firmware/efi/libstub/zboot-header.S | 143 | ||||
-rw-r--r-- | drivers/firmware/efi/libstub/zboot.c | 290 | ||||
-rw-r--r-- | drivers/firmware/efi/libstub/zboot.lds | 44 |
12 files changed, 691 insertions, 24 deletions
diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig index cbf1c55dc224..5b79a4a4a88d 100644 --- a/drivers/firmware/efi/Kconfig +++ b/drivers/firmware/efi/Kconfig @@ -105,6 +105,47 @@ config EFI_RUNTIME_WRAPPERS config EFI_GENERIC_STUB bool +config EFI_ZBOOT + bool "Enable the generic EFI decompressor" + depends on EFI_GENERIC_STUB && !ARM + select HAVE_KERNEL_GZIP + select HAVE_KERNEL_LZ4 + select HAVE_KERNEL_LZMA + select HAVE_KERNEL_LZO + select HAVE_KERNEL_XZ + select HAVE_KERNEL_ZSTD + help + Create the bootable image as an EFI application that carries the + actual kernel image in compressed form, and decompresses it into + memory before executing it via LoadImage/StartImage EFI boot service + calls. For compatibility with non-EFI loaders, the payload can be + decompressed and executed by the loader as well, provided that the + loader implements the decompression algorithm and that non-EFI boot + is supported by the encapsulated image. (The compression algorithm + used is described in the zboot image header) + +config EFI_ZBOOT_SIGNED + def_bool y + depends on EFI_ZBOOT_SIGNING_CERT != "" + depends on EFI_ZBOOT_SIGNING_KEY != "" + +config EFI_ZBOOT_SIGNING + bool "Sign the EFI decompressor for UEFI secure boot" + depends on EFI_ZBOOT + help + Use the 'sbsign' command line tool (which must exist on the host + path) to sign both the EFI decompressor PE/COFF image, as well as the + encapsulated PE/COFF image, which is subsequently compressed and + wrapped by the former image. + +config EFI_ZBOOT_SIGNING_CERT + string "Certificate to use for signing the compressed EFI boot image" + depends on EFI_ZBOOT_SIGNING + +config EFI_ZBOOT_SIGNING_KEY + string "Private key to use for signing the compressed EFI boot image" + depends on EFI_ZBOOT_SIGNING + config EFI_ARMSTUB_DTB_LOADER bool "Enable the DTB loader" depends on EFI_GENERIC_STUB && !RISCV && !LOONGARCH diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile index 6234edf3d827..a7cadf7b1471 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -69,7 +69,7 @@ lib-$(CONFIG_EFI_PARAMS_FROM_FDT) += fdt.o \ $(obj)/lib-%.o: $(srctree)/lib/%.c FORCE $(call if_changed_rule,cc_o_c) -lib-$(CONFIG_EFI_GENERIC_STUB) += efi-stub.o string.o +lib-$(CONFIG_EFI_GENERIC_STUB) += efi-stub.o string.o intrinsics.o systable.o lib-$(CONFIG_ARM) += arm32-stub.o lib-$(CONFIG_ARM64) += arm64-stub.o @@ -79,6 +79,12 @@ lib-$(CONFIG_LOONGARCH) += loongarch-stub.o CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) +zboot-obj-$(CONFIG_RISCV) := lib-clz_ctz.o lib-ashldi3.o +lib-$(CONFIG_EFI_ZBOOT) += zboot.o $(zboot-obj-y) + +extra-y := $(lib-y) +lib-y := $(patsubst %.o,%.stub.o,$(lib-y)) + # Even when -mbranch-protection=none is set, Clang will generate a # .note.gnu.property for code-less object files (like lib/ctype.c), # so work around this by explicitly removing the unwanted section. @@ -118,9 +124,6 @@ STUBCOPY_RELOC-$(CONFIG_ARM) := R_ARM_ABS # a verification pass to see if any absolute relocations exist in any of the # object files. # -extra-y := $(lib-y) -lib-y := $(patsubst %.o,%.stub.o,$(lib-y)) - STUBCOPY_FLAGS-$(CONFIG_ARM64) += --prefix-alloc-sections=.init \ --prefix-symbols=__efistub_ STUBCOPY_RELOC-$(CONFIG_ARM64) := R_AARCH64_ABS diff --git a/drivers/firmware/efi/libstub/Makefile.zboot b/drivers/firmware/efi/libstub/Makefile.zboot new file mode 100644 index 000000000000..35f234ad8738 --- /dev/null +++ b/drivers/firmware/efi/libstub/Makefile.zboot @@ -0,0 +1,70 @@ +# SPDX-License-Identifier: GPL-2.0 + +# to be include'd by arch/$(ARCH)/boot/Makefile after setting +# EFI_ZBOOT_PAYLOAD, EFI_ZBOOT_BFD_TARGET and EFI_ZBOOT_MACH_TYPE + +comp-type-$(CONFIG_KERNEL_GZIP) := gzip +comp-type-$(CONFIG_KERNEL_LZ4) := lz4 +comp-type-$(CONFIG_KERNEL_LZMA) := lzma +comp-type-$(CONFIG_KERNEL_LZO) := lzo +comp-type-$(CONFIG_KERNEL_XZ) := xzkern +comp-type-$(CONFIG_KERNEL_ZSTD) := zstd22 + +# in GZIP, the appended le32 carrying the uncompressed size is part of the +# format, but in other cases, we just append it at the end for convenience, +# causing the original tools to complain when checking image integrity. +# So disregard it when calculating the payload size in the zimage header. +zboot-method-y := $(comp-type-y)_with_size +zboot-size-len-y := 4 + +zboot-method-$(CONFIG_KERNEL_GZIP) := gzip +zboot-size-len-$(CONFIG_KERNEL_GZIP) := 0 + +quiet_cmd_sbsign = SBSIGN $@ + cmd_sbsign = sbsign --out $@ $< \ + --key $(CONFIG_EFI_ZBOOT_SIGNING_KEY) \ + --cert $(CONFIG_EFI_ZBOOT_SIGNING_CERT) + +$(obj)/$(EFI_ZBOOT_PAYLOAD).signed: $(obj)/$(EFI_ZBOOT_PAYLOAD) FORCE + $(call if_changed,sbsign) + +ZBOOT_PAYLOAD-y := $(EFI_ZBOOT_PAYLOAD) +ZBOOT_PAYLOAD-$(CONFIG_EFI_ZBOOT_SIGNED) := $(EFI_ZBOOT_PAYLOAD).signed + +$(obj)/vmlinuz: $(obj)/$(ZBOOT_PAYLOAD-y) FORCE + $(call if_changed,$(zboot-method-y)) + +OBJCOPYFLAGS_vmlinuz.o := -I binary -O $(EFI_ZBOOT_BFD_TARGET) \ + --rename-section .data=.gzdata,load,alloc,readonly,contents +$(obj)/vmlinuz.o: $(obj)/vmlinuz FORCE + $(call if_changed,objcopy) + +AFLAGS_zboot-header.o += -DMACHINE_TYPE=IMAGE_FILE_MACHINE_$(EFI_ZBOOT_MACH_TYPE) \ + -DZBOOT_EFI_PATH="\"$(realpath $(obj)/vmlinuz.efi.elf)\"" \ + -DZBOOT_SIZE_LEN=$(zboot-size-len-y) \ + -DCOMP_TYPE="\"$(comp-type-y)\"" + +$(obj)/zboot-header.o: $(srctree)/drivers/firmware/efi/libstub/zboot-header.S FORCE + $(call if_changed_rule,as_o_S) + +ZBOOT_DEPS := $(obj)/zboot-header.o $(objtree)/drivers/firmware/efi/libstub/lib.a + +LDFLAGS_vmlinuz.efi.elf := -T $(srctree)/drivers/firmware/efi/libstub/zboot.lds +$(obj)/vmlinuz.efi.elf: $(obj)/vmlinuz.o $(ZBOOT_DEPS) FORCE + $(call if_changed,ld) + +ZBOOT_EFI-y := vmlinuz.efi +ZBOOT_EFI-$(CONFIG_EFI_ZBOOT_SIGNED) := vmlinuz.efi.unsigned + +OBJCOPYFLAGS_$(ZBOOT_EFI-y) := -O binary +$(obj)/$(ZBOOT_EFI-y): $(obj)/vmlinuz.efi.elf FORCE + $(call if_changed,objcopy) + +targets += zboot-header.o vmlinuz vmlinuz.o vmlinuz.efi.elf vmlinuz.efi + +ifneq ($(CONFIG_EFI_ZBOOT_SIGNED),) +$(obj)/vmlinuz.efi: $(obj)/vmlinuz.efi.unsigned FORCE + $(call if_changed,sbsign) +endif + +targets += $(EFI_ZBOOT_PAYLOAD).signed vmlinuz.efi.unsigned diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c index e3ee8383e02c..aa6e73c0de2d 100644 --- a/drivers/firmware/efi/libstub/efi-stub-helper.c +++ b/drivers/firmware/efi/libstub/efi-stub-helper.c @@ -310,7 +310,7 @@ bool efi_load_option_unpack(efi_load_option_unpacked_t *dest, * * Detect this case and extract OptionalData. */ -void efi_apply_loadoptions_quirk(const void **load_options, int *load_options_size) +void efi_apply_loadoptions_quirk(const void **load_options, u32 *load_options_size) { const efi_load_option_t *load_option = *load_options; efi_load_option_unpacked_t load_option_unpacked; @@ -341,21 +341,22 @@ void efi_apply_loadoptions_quirk(const void **load_options, int *load_options_si */ char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len) { - const u16 *s2; - unsigned long cmdline_addr = 0; - int options_chars = efi_table_attr(image, load_options_size); - const u16 *options = efi_table_attr(image, load_options); + const efi_char16_t *options = efi_table_attr(image, load_options); + u32 options_size = efi_table_attr(image, load_options_size); int options_bytes = 0, safe_options_bytes = 0; /* UTF-8 bytes */ + unsigned long cmdline_addr = 0; + const efi_char16_t *s2; bool in_quote = false; efi_status_t status; + u32 options_chars; - efi_apply_loadoptions_quirk((const void **)&options, &options_chars); - options_chars /= sizeof(*options); + efi_apply_loadoptions_quirk((const void **)&options, &options_size); + options_chars = options_size / sizeof(efi_char16_t); if (options) { s2 = options; while (options_bytes < COMMAND_LINE_SIZE && options_chars--) { - u16 c = *s2++; + efi_char16_t c = *s2++; if (c < 0x80) { if (c == L'\0' || c == L'\n') diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c index 80a1c72c4566..269df915675e 100644 --- a/drivers/firmware/efi/libstub/efi-stub.c +++ b/drivers/firmware/efi/libstub/efi-stub.c @@ -56,8 +56,6 @@ static u64 virtmap_base = EFI_RT_VIRTUAL_BASE; static bool flat_va_mapping = (EFI_RT_VIRTUAL_OFFSET != 0); -const efi_system_table_t *efi_system_table; - static struct screen_info *setup_graphics(void) { efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h index fc90e453bbbb..9ed5889594ed 100644 --- a/drivers/firmware/efi/libstub/efistub.h +++ b/drivers/firmware/efi/libstub/efistub.h @@ -162,6 +162,23 @@ void efi_set_u64_split(u64 data, u32 *lo, u32 *hi) typedef struct efi_generic_dev_path efi_device_path_protocol_t; +union efi_device_path_to_text_protocol { + struct { + efi_char16_t *(__efiapi *convert_device_node_to_text)( + const efi_device_path_protocol_t *, + bool, bool); + efi_char16_t *(__efiapi *convert_device_path_to_text)( + const efi_device_path_protocol_t *, + bool, bool); + }; + struct { + u32 convert_device_node_to_text; + u32 convert_device_path_to_text; + } mixed_mode; +}; + +typedef union efi_device_path_to_text_protocol efi_device_path_to_text_protocol_t; + typedef void *efi_event_t; /* Note that notifications won't work in mixed mode */ typedef void (__efiapi *efi_event_notify_t)(efi_event_t, void *); @@ -245,13 +262,17 @@ union efi_boot_services { efi_handle_t *); efi_status_t (__efiapi *install_configuration_table)(efi_guid_t *, void *); - void *load_image; - void *start_image; + efi_status_t (__efiapi *load_image)(bool, efi_handle_t, + efi_device_path_protocol_t *, + void *, unsigned long, + efi_handle_t *); + efi_status_t (__efiapi *start_image)(efi_handle_t, unsigned long *, + efi_char16_t **); efi_status_t __noreturn (__efiapi *exit)(efi_handle_t, efi_status_t, unsigned long, efi_char16_t *); - void *unload_image; + efi_status_t (__efiapi *unload_image)(efi_handle_t); efi_status_t (__efiapi *exit_boot_services)(efi_handle_t, unsigned long); void *get_next_monotonic_count; @@ -268,11 +289,11 @@ union efi_boot_services { void *locate_handle_buffer; efi_status_t (__efiapi *locate_protocol)(efi_guid_t *, void *, void **); - void *install_multiple_protocol_interfaces; - void *uninstall_multiple_protocol_interfaces; + efi_status_t (__efiapi *install_multiple_protocol_interfaces)(efi_handle_t *, ...); + efi_status_t (__efiapi *uninstall_multiple_protocol_interfaces)(efi_handle_t, ...); void *calculate_crc32; - void *copy_mem; - void *set_mem; + void (__efiapi *copy_mem)(void *, const void *, unsigned long); + void (__efiapi *set_mem)(void *, unsigned long, unsigned char); void *create_event_ex; }; struct { @@ -831,7 +852,7 @@ typedef struct { u16 file_path_list_length; const efi_char16_t *description; const efi_device_path_protocol_t *file_path_list; - size_t optional_data_size; + u32 optional_data_size; const void *optional_data; } efi_load_option_unpacked_t; @@ -872,7 +893,7 @@ __printf(1, 2) int efi_printk(char const *fmt, ...); void efi_free(unsigned long size, unsigned long addr); -void efi_apply_loadoptions_quirk(const void **load_options, int *load_options_size); +void efi_apply_loadoptions_quirk(const void **load_options, u32 *load_options_size); char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len); diff --git a/drivers/firmware/efi/libstub/file.c b/drivers/firmware/efi/libstub/file.c index 488a8027518d..f756c61396e9 100644 --- a/drivers/firmware/efi/libstub/file.c +++ b/drivers/firmware/efi/libstub/file.c @@ -66,10 +66,28 @@ static efi_status_t efi_open_file(efi_file_protocol_t *volume, static efi_status_t efi_open_volume(efi_loaded_image_t *image, efi_file_protocol_t **fh) { + struct efi_vendor_dev_path *dp = image->file_path; + efi_guid_t li_proto = LOADED_IMAGE_PROTOCOL_GUID; efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID; efi_simple_file_system_protocol_t *io; efi_status_t status; + // If we are using EFI zboot, we should look for the file system + // protocol on the parent image's handle instead + if (IS_ENABLED(CONFIG_EFI_ZBOOT) && + image->parent_handle != NULL && + dp != NULL && + dp->header.type == EFI_DEV_MEDIA && + dp->header.sub_type == EFI_DEV_MEDIA_VENDOR && + !efi_guidcmp(dp->vendorguid, LINUX_EFI_ZBOOT_MEDIA_GUID)) { + status = efi_bs_call(handle_protocol, image->parent_handle, + &li_proto, (void *)&image); + if (status != EFI_SUCCESS) { + efi_err("Failed to locate parent image handle\n"); + return status; + } + } + status = efi_bs_call(handle_protocol, image->device_handle, &fs_proto, (void **)&io); if (status != EFI_SUCCESS) { @@ -136,7 +154,7 @@ efi_status_t handle_cmdline_files(efi_loaded_image_t *image, unsigned long *load_size) { const efi_char16_t *cmdline = image->load_options; - int cmdline_len = image->load_options_size; + u32 cmdline_len = image->load_options_size; unsigned long efi_chunk_size = ULONG_MAX; efi_file_protocol_t *volume = NULL; efi_file_protocol_t *file; diff --git a/drivers/firmware/efi/libstub/intrinsics.c b/drivers/firmware/efi/libstub/intrinsics.c new file mode 100644 index 000000000000..a04ab39292b6 --- /dev/null +++ b/drivers/firmware/efi/libstub/intrinsics.c @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/efi.h> +#include <asm/efi.h> +#include <asm/string.h> + +#include "efistub.h" + +#ifdef CONFIG_KASAN +#undef memcpy +#undef memmove +#undef memset +void *__memcpy(void *__dest, const void *__src, size_t __n) __alias(memcpy); +void *__memmove(void *__dest, const void *__src, size_t count) __alias(memmove); +void *__memset(void *s, int c, size_t count) __alias(memset); +#endif + +void *memcpy(void *dst, const void *src, size_t len) +{ + efi_bs_call(copy_mem, dst, src, len); + return dst; +} + +extern void *memmove(void *dst, const void *src, size_t len) __alias(memcpy); + +void *memset(void *dst, int c, size_t len) +{ + efi_bs_call(set_mem, dst, len, c & U8_MAX); + return dst; +} diff --git a/drivers/firmware/efi/libstub/systable.c b/drivers/firmware/efi/libstub/systable.c new file mode 100644 index 000000000000..91d016b02f8c --- /dev/null +++ b/drivers/firmware/efi/libstub/systable.c @@ -0,0 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/efi.h> +#include <asm/efi.h> + +#include "efistub.h" + +const efi_system_table_t *efi_system_table; diff --git a/drivers/firmware/efi/libstub/zboot-header.S b/drivers/firmware/efi/libstub/zboot-header.S new file mode 100644 index 000000000000..9e6fe061ab07 --- /dev/null +++ b/drivers/firmware/efi/libstub/zboot-header.S @@ -0,0 +1,143 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include <linux/pe.h> + +#ifdef CONFIG_64BIT + .set .Lextra_characteristics, 0x0 + .set .Lpe_opt_magic, PE_OPT_MAGIC_PE32PLUS +#else + .set .Lextra_characteristics, IMAGE_FILE_32BIT_MACHINE + .set .Lpe_opt_magic, PE_OPT_MAGIC_PE32 +#endif + + .section ".head", "a" + .globl __efistub_efi_zboot_header +__efistub_efi_zboot_header: +.Ldoshdr: + .long MZ_MAGIC + .ascii "zimg" // image type + .long __efistub__gzdata_start - .Ldoshdr // payload offset + .long __efistub__gzdata_size - ZBOOT_SIZE_LEN // payload size + .long 0, 0 // reserved + .asciz COMP_TYPE // compression type + .org .Ldoshdr + 0x3c + .long .Lpehdr - .Ldoshdr // PE header offset + +.Lpehdr: + .long PE_MAGIC + .short MACHINE_TYPE + .short .Lsection_count + .long 0 + .long 0 + .long 0 + .short .Lsection_table - .Loptional_header + .short IMAGE_FILE_DEBUG_STRIPPED | \ + IMAGE_FILE_EXECUTABLE_IMAGE | \ + IMAGE_FILE_LINE_NUMS_STRIPPED |\ + .Lextra_characteristics + +.Loptional_header: + .short .Lpe_opt_magic + .byte 0, 0 + .long _etext - .Lefi_header_end + .long __data_size + .long 0 + .long __efistub_efi_zboot_entry - .Ldoshdr + .long .Lefi_header_end - .Ldoshdr + +#ifdef CONFIG_64BIT + .quad 0 +#else + .long _etext - .Ldoshdr, 0x0 +#endif + .long 4096 + .long 512 + .short 0, 0 + .short LINUX_EFISTUB_MAJOR_VERSION // MajorImageVersion + .short LINUX_EFISTUB_MINOR_VERSION // MinorImageVersion + .short 0, 0 + .long 0 + .long _end - .Ldoshdr + + .long .Lefi_header_end - .Ldoshdr + .long 0 + .short IMAGE_SUBSYSTEM_EFI_APPLICATION + .short 0 +#ifdef CONFIG_64BIT + .quad 0, 0, 0, 0 +#else + .long 0, 0, 0, 0 +#endif + .long 0 + .long (.Lsection_table - .) / 8 + + .quad 0 // ExportTable + .quad 0 // ImportTable + .quad 0 // ResourceTable + .quad 0 // ExceptionTable + .quad 0 // CertificationTable + .quad 0 // BaseRelocationTable +#ifdef CONFIG_DEBUG_EFI + .long .Lefi_debug_table - .Ldoshdr // DebugTable + .long .Lefi_debug_table_size +#endif + +.Lsection_table: + .ascii ".text\0\0\0" + .long _etext - .Lefi_header_end + .long .Lefi_header_end - .Ldoshdr + .long _etext - .Lefi_header_end + .long .Lefi_header_end - .Ldoshdr + + .long 0, 0 + .short 0, 0 + .long IMAGE_SCN_CNT_CODE | \ + IMAGE_SCN_MEM_READ | \ + IMAGE_SCN_MEM_EXECUTE + + .ascii ".data\0\0\0" + .long __data_size + .long _etext - .Ldoshdr + .long __data_rawsize + .long _etext - .Ldoshdr + + .long 0, 0 + .short 0, 0 + .long IMAGE_SCN_CNT_INITIALIZED_DATA | \ + IMAGE_SCN_MEM_READ | \ + IMAGE_SCN_MEM_WRITE + + .set .Lsection_count, (. - .Lsection_table) / 40 + +#ifdef CONFIG_DEBUG_EFI + .section ".rodata", "a" + .align 2 +.Lefi_debug_table: + // EFI_IMAGE_DEBUG_DIRECTORY_ENTRY + .long 0 // Characteristics + .long 0 // TimeDateStamp + .short 0 // MajorVersion + .short 0 // MinorVersion + .long IMAGE_DEBUG_TYPE_CODEVIEW // Type + .long .Lefi_debug_entry_size // SizeOfData + .long 0 // RVA + .long .Lefi_debug_entry - .Ldoshdr // FileOffset + + .set .Lefi_debug_table_size, . - .Lefi_debug_table + .previous + +.Lefi_debug_entry: + // EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY + .ascii "NB10" // Signature + .long 0 // Unknown + .long 0 // Unknown2 + .long 0 // Unknown3 + + .asciz ZBOOT_EFI_PATH + + .set .Lefi_debug_entry_size, . - .Lefi_debug_entry +#endif + + .p2align 12 +.Lefi_header_end: + diff --git a/drivers/firmware/efi/libstub/zboot.c b/drivers/firmware/efi/libstub/zboot.c new file mode 100644 index 000000000000..a9f41902c908 --- /dev/null +++ b/drivers/firmware/efi/libstub/zboot.c @@ -0,0 +1,290 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/efi.h> +#include <linux/pe.h> +#include <asm/efi.h> +#include <asm/unaligned.h> + +#include "efistub.h" + +static unsigned char zboot_heap[SZ_256K] __aligned(64); +static unsigned long free_mem_ptr, free_mem_end_ptr; + +#define STATIC static +#if defined(CONFIG_KERNEL_GZIP) +#include "../../../../lib/decompress_inflate.c" +#elif defined(CONFIG_KERNEL_LZ4) +#include "../../../../lib/decompress_unlz4.c" +#elif defined(CONFIG_KERNEL_LZMA) +#include "../../../../lib/decompress_unlzma.c" +#elif defined(CONFIG_KERNEL_LZO) +#include "../../../../lib/decompress_unlzo.c" +#elif defined(CONFIG_KERNEL_XZ) +#undef memcpy +#define memcpy memcpy +#undef memmove +#define memmove memmove +#include "../../../../lib/decompress_unxz.c" +#elif defined(CONFIG_KERNEL_ZSTD) +#include "../../../../lib/decompress_unzstd.c" +#endif + +extern char efi_zboot_header[]; +extern char _gzdata_start[], _gzdata_end[]; + +static void log(efi_char16_t str[]) +{ + efi_call_proto(efi_table_attr(efi_system_table, con_out), + output_string, L"EFI decompressor: "); + efi_call_proto(efi_table_attr(efi_system_table, con_out), + output_string, str); + efi_call_proto(efi_table_attr(efi_system_table, con_out), + output_string, L"\n"); +} + +static void error(char *x) +{ + log(L"error() called from decompressor library\n"); +} + +// Local version to avoid pulling in memcmp() +static bool guids_eq(const efi_guid_t *a, const efi_guid_t *b) +{ + const u32 *l = (u32 *)a; + const u32 *r = (u32 *)b; + + return l[0] == r[0] && l[1] == r[1] && l[2] == r[2] && l[3] == r[3]; +} + +static efi_status_t __efiapi +load_file(efi_load_file_protocol_t *this, efi_device_path_protocol_t *rem, + bool boot_policy, unsigned long *bufsize, void *buffer) +{ + unsigned long compressed_size = _gzdata_end - _gzdata_start; + struct efi_vendor_dev_path *vendor_dp; + bool decompress = false; + unsigned long size; + int ret; + + if (rem == NULL || bufsize == NULL) + return EFI_INVALID_PARAMETER; + + if (boot_policy) + return EFI_UNSUPPORTED; + + // Look for our vendor media device node in the remaining file path + if (rem->type == EFI_DEV_MEDIA && + rem->sub_type == EFI_DEV_MEDIA_VENDOR) { + vendor_dp = container_of(rem, struct efi_vendor_dev_path, header); + if (!guids_eq(&vendor_dp->vendorguid, &LINUX_EFI_ZBOOT_MEDIA_GUID)) + return EFI_NOT_FOUND; + + decompress = true; + rem = (void *)(vendor_dp + 1); + } + + if (rem->type != EFI_DEV_END_PATH || + rem->sub_type != EFI_DEV_END_ENTIRE) + return EFI_NOT_FOUND; + + // The uncompressed size of the payload is appended to the raw bit + // stream, and may therefore appear misaligned in memory + size = decompress ? get_unaligned_le32(_gzdata_end - 4) + : compressed_size; + if (buffer == NULL || *bufsize < size) { + *bufsize = size; + return EFI_BUFFER_TOO_SMALL; + } + + if (decompress) { + ret = __decompress(_gzdata_start, compressed_size, NULL, NULL, + buffer, size, NULL, error); + if (ret < 0) { + log(L"Decompression failed"); + return EFI_DEVICE_ERROR; + } + } else { + memcpy(buffer, _gzdata_start, compressed_size); + } + + return EFI_SUCCESS; +} + +// Return the length in bytes of the device path up to the first end node. +static int device_path_length(const efi_device_path_protocol_t *dp) +{ + int len = 0; + + while (dp->type != EFI_DEV_END_PATH) { + len += dp->length; + dp = (void *)((u8 *)dp + dp->length); + } + return len; +} + +static void append_rel_offset_node(efi_device_path_protocol_t **dp, + unsigned long start, unsigned long end) +{ + struct efi_rel_offset_dev_path *rodp = (void *)*dp; + + rodp->header.type = EFI_DEV_MEDIA; + rodp->header.sub_type = EFI_DEV_MEDIA_REL_OFFSET; + rodp->header.length = sizeof(struct efi_rel_offset_dev_path); + rodp->reserved = 0; + rodp->starting_offset = start; + rodp->ending_offset = end; + + *dp = (void *)(rodp + 1); +} + +static void append_ven_media_node(efi_device_path_protocol_t **dp, + efi_guid_t *guid) +{ + struct efi_vendor_dev_path *vmdp = (void *)*dp; + + vmdp->header.type = EFI_DEV_MEDIA; + vmdp->header.sub_type = EFI_DEV_MEDIA_VENDOR; + vmdp->header.length = sizeof(struct efi_vendor_dev_path); + vmdp->vendorguid = *guid; + + *dp = (void *)(vmdp + 1); +} + +static void append_end_node(efi_device_path_protocol_t **dp) +{ + (*dp)->type = EFI_DEV_END_PATH; + (*dp)->sub_type = EFI_DEV_END_ENTIRE; + (*dp)->length = sizeof(struct efi_generic_dev_path); + + ++*dp; +} + +asmlinkage efi_status_t __efiapi +efi_zboot_entry(efi_handle_t handle, efi_system_table_t *systab) +{ + efi_device_path_protocol_t *parent_dp, *dpp, *lf2_dp, *li_dp; + efi_load_file2_protocol_t zboot_load_file2; + efi_loaded_image_t *parent, *child; + unsigned long exit_data_size; + efi_handle_t child_handle; + efi_handle_t zboot_handle; + efi_char16_t *exit_data; + efi_status_t status; + void *dp_alloc; + int dp_len; + + WRITE_ONCE(efi_system_table, systab); + + free_mem_ptr = (unsigned long)&zboot_heap; + free_mem_end_ptr = free_mem_ptr + sizeof(zboot_heap); + + exit_data = NULL; + exit_data_size = 0; + + status = efi_bs_call(handle_protocol, handle, + &LOADED_IMAGE_PROTOCOL_GUID, (void **)&parent); + if (status != EFI_SUCCESS) { + log(L"Failed to locate parent's loaded image protocol"); + return status; + } + + status = efi_bs_call(handle_protocol, handle, + &LOADED_IMAGE_DEVICE_PATH_PROTOCOL_GUID, + (void **)&parent_dp); + if (status != EFI_SUCCESS) { + log(L"Failed to locate parent's loaded image device path protocol"); + return status; + } + + // Allocate some pool memory for device path protocol data + dp_len = parent_dp ? device_path_length(parent_dp) : 0; + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, + 2 * (dp_len + sizeof(struct efi_rel_offset_dev_path) + + sizeof(struct efi_generic_dev_path)) + + sizeof(struct efi_vendor_dev_path), + (void **)&dp_alloc); + if (status != EFI_SUCCESS) { + log(L"Failed to allocate device path pool memory"); + return status; + } + + // Create a device path describing the compressed payload in this image + // <...parent_dp...>/Offset(<start>, <end>) + lf2_dp = memcpy(dp_alloc, parent_dp, dp_len); + dpp = (void *)((u8 *)lf2_dp + dp_len); + append_rel_offset_node(&dpp, + (unsigned long)(_gzdata_start - efi_zboot_header), + (unsigned long)(_gzdata_end - efi_zboot_header - 1)); + append_end_node(&dpp); + + // Create a device path describing the decompressed payload in this image + // <...parent_dp...>/Offset(<start>, <end>)/VenMedia(ZBOOT_MEDIA_GUID) + dp_len += sizeof(struct efi_rel_offset_dev_path); + li_dp = memcpy(dpp, lf2_dp, dp_len); + dpp = (void *)((u8 *)li_dp + dp_len); + append_ven_media_node(&dpp, &LINUX_EFI_ZBOOT_MEDIA_GUID); + append_end_node(&dpp); + + zboot_handle = NULL; + zboot_load_file2.load_file = load_file; + status = efi_bs_call(install_multiple_protocol_interfaces, + &zboot_handle, + &EFI_DEVICE_PATH_PROTOCOL_GUID, lf2_dp, + &EFI_LOAD_FILE2_PROTOCOL_GUID, &zboot_load_file2, + NULL); + if (status != EFI_SUCCESS) { + log(L"Failed to install LoadFile2 protocol and device path"); + goto free_dpalloc; + } + + status = efi_bs_call(load_image, false, handle, li_dp, NULL, 0, + &child_handle); + if (status != EFI_SUCCESS) { + log(L"Failed to load image"); + goto uninstall_lf2; + } + + status = efi_bs_call(handle_protocol, child_handle, + &LOADED_IMAGE_PROTOCOL_GUID, (void **)&child); + if (status != EFI_SUCCESS) { + log(L"Failed to locate child's loaded image protocol"); + goto unload_image; + } + + // Copy the kernel command line + child->load_options = parent->load_options; + child->load_options_size = parent->load_options_size; + + status = efi_bs_call(start_image, child_handle, &exit_data_size, + &exit_data); + if (status != EFI_SUCCESS) { + log(L"StartImage() returned with error"); + if (exit_data_size > 0) + log(exit_data); + + // If StartImage() returns EFI_SECURITY_VIOLATION, the image is + // not unloaded so we need to do it by hand. + if (status == EFI_SECURITY_VIOLATION) +unload_image: + efi_bs_call(unload_image, child_handle); + } + +uninstall_lf2: + efi_bs_call(uninstall_multiple_protocol_interfaces, + zboot_handle, + &EFI_DEVICE_PATH_PROTOCOL_GUID, lf2_dp, + &EFI_LOAD_FILE2_PROTOCOL_GUID, &zboot_load_file2, + NULL); + +free_dpalloc: + efi_bs_call(free_pool, dp_alloc); + + efi_bs_call(exit, handle, status, exit_data_size, exit_data); + + // Free ExitData in case Exit() returned with a failure code, + // but return the original status code. + log(L"Exit() returned with failure code"); + if (exit_data != NULL) + efi_bs_call(free_pool, exit_data); + return status; +} diff --git a/drivers/firmware/efi/libstub/zboot.lds b/drivers/firmware/efi/libstub/zboot.lds new file mode 100644 index 000000000000..87a62765bafd --- /dev/null +++ b/drivers/firmware/efi/libstub/zboot.lds @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +ENTRY(__efistub_efi_zboot_header); + +SECTIONS +{ + .head : ALIGN(4096) { + *(.head) + } + + .text : { + *(.text* .init.text*) + } + + .rodata : ALIGN(8) { + __efistub__gzdata_start = .; + *(.gzdata) + __efistub__gzdata_end = .; + *(.rodata* .init.rodata* .srodata*) + _etext = ALIGN(4096); + . = _etext; + } + + .data : ALIGN(4096) { + *(.data* .init.data*) + _edata = ALIGN(512); + . = _edata; + } + + .bss : { + *(.bss* .init.bss*) + _end = ALIGN(512); + . = _end; + } + + /DISCARD/ : { + *(.modinfo .init.modinfo) + } +} + +PROVIDE(__efistub__gzdata_size = ABSOLUTE(. - __efistub__gzdata_start)); + +PROVIDE(__data_rawsize = ABSOLUTE(_edata - _etext)); +PROVIDE(__data_size = ABSOLUTE(_end - _etext)); |