Re: [PATCH v4 20/26] x86/build: Make generated PE more spec compliant

From: Ard Biesheuvel
Date: Fri Mar 10 2023 - 10:29:04 EST

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On Thu, 15 Dec 2022 at 13:42, Evgeniy Baskov <baskov@xxxxxxxxx> wrote:
>
> Currently kernel image is not fully compliant PE image, so it may
> fail to boot with stricter implementations of UEFI PE loaders.
>
> Set minimal alignments and sizes specified by PE documentation [1]
> referenced by UEFI specification [2]. Align PE header to 8 bytes.
>
> Generate PE sections dynamically. This simplifies code, since with
> current implementation all of the sections needs to be defined in
> header.S, where most section header fields do not hold valid values,
> except for their names. Before the change, it also held flags,
> but now flags depend on kernel configuration and it is simpler
> to set them from build.c too.
>
> Setup sections protection. Since we cannot fit every needed section,
> set a part of protection flags dynamically during initialization.
> This step is omitted if CONFIG_EFI_DXE_MEM_ATTRIBUTES is not set.
>
> [1] https://download.microsoft.com/download/9/c/5/9c5b2167-8017-4bae-9fde-d599bac8184a/pecoff_v83.docx
> [2] https://uefi.org/sites/default/files/resources/UEFI_Spec_2_9_2021_03_18.pdf
>
> Tested-by: Peter Jones <pjones@xxxxxxxxxx>
> Signed-off-by: Evgeniy Baskov <baskov@xxxxxxxxx>

I would prefer it if we didn't rewrite the build tool this way.

Having the sections in header.S in the order they appear in the binary
is rather useful, and I don't think we should manipulate the section
flags based on whether CONFIG_DXE_MEM_ATTRIBUTES is set. I also don't
think we need more than .text / .,data (as discussed in the other
thread on linux-efi@)

Furthermore, I had a look at the audk PE loader [0], and I think it is
being overly pedantic.

The PE/COFF spec does not require that all sections are virtually
contiguous, and it does not require that the file content is
completely covered by either the header or by a section.

So what I would prefer to do is the following:

Sections:
Idx Name Size VMA Type
0 .reloc 00000200 0000000000002000 DATA
1 .compat 00000200 0000000000003000 DATA
2 .text 00bee000 0000000000004000 TEXT
3 .data 00002200 0000000000bf2000 DATA

using 4k section alignment and 512 byte file alignment, and a header
size of 0x200 as before (This requires my patch that allows the setup
header to remain unmapped when running the stub [1])

The reloc and compat payloads are placed at the end of the setup data
as before, but increased in size to 512 bytes each, and then mapped
non-1:1 into the RVA space.

This works happily with both the existing PE loader as well as the
audk one, but with the pedantic flags disabled.

[0] https://github.com/acidanthera/audk
[1] https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?id=84412899c16c65af13dac305aa01a5a85e08c69e

> ---
> arch/x86/boot/Makefile | 2 +-
> arch/x86/boot/header.S | 96 +--------
> arch/x86/boot/tools/build.c | 270 +++++++++++++-----------
> drivers/firmware/efi/libstub/x86-stub.c | 7 +-
> 4 files changed, 161 insertions(+), 214 deletions(-)
>
> diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
> index 9e38ffaadb5d..bed78c82238e 100644
> --- a/arch/x86/boot/Makefile
> +++ b/arch/x86/boot/Makefile
> @@ -91,7 +91,7 @@ $(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE
>
> SETUP_OBJS = $(addprefix $(obj)/,$(setup-y))
>
> -sed-zoffset := -e 's/^$[0-9a-fA-F]*$ [a-zA-Z] $startup_32\|startup_64\|efi32_stub_entry\|efi64_stub_entry\|efi_pe_entry\|efi32_pe_entry\|input_data\|kernel_info\|_end\|_ehead\|_text\|z_.*$$$/\#define ZO_\2 0x\1/p'
> +sed-zoffset := -e 's/^$[0-9a-fA-F]*$ [a-zA-Z] $startup_32\|startup_64\|efi32_stub_entry\|efi64_stub_entry\|efi_pe_entry\|efi32_pe_entry\|input_data\|kernel_info\|_end\|_ehead\|_text\|_rodata\|z_.*$$$/\#define ZO_\2 0x\1/p'
>
> quiet_cmd_zoffset = ZOFFSET $@
> cmd_zoffset = $(NM) $< | sed -n $(sed-zoffset) > $@
> diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
> index 9fec80bc504b..07e31ddb074f 100644
> --- a/arch/x86/boot/header.S
> +++ b/arch/x86/boot/header.S
> @@ -94,6 +94,7 @@ bugger_off_msg:
> .set bugger_off_msg_size, . - bugger_off_msg
>
> #ifdef CONFIG_EFI_STUB
> + .align 8
> pe_header:
> .long PE_MAGIC
>
> @@ -107,7 +108,7 @@ coff_header:
> .set pe_opt_magic, PE_OPT_MAGIC_PE32PLUS
> .word IMAGE_FILE_MACHINE_AMD64
> #endif
> - .word section_count # nr_sections
> + .word 0 # nr_sections
> .long 0 # TimeDateStamp
> .long 0 # PointerToSymbolTable
> .long 1 # NumberOfSymbols
> @@ -131,7 +132,7 @@ optional_header:
> # Filled in by build.c
> .long 0x0000 # AddressOfEntryPoint
>
> - .long 0x0200 # BaseOfCode
> + .long 0x1000 # BaseOfCode
> #ifdef CONFIG_X86_32
> .long 0 # data
> #endif
> @@ -144,8 +145,8 @@ extra_header_fields:
> #else
> .quad image_base # ImageBase
> #endif
> - .long 0x20 # SectionAlignment
> - .long 0x20 # FileAlignment
> + .long 0x1000 # SectionAlignment
> + .long 0x200 # FileAlignment
> .word 0 # MajorOperatingSystemVersion
> .word 0 # MinorOperatingSystemVersion
> .word LINUX_EFISTUB_MAJOR_VERSION # MajorImageVersion
> @@ -188,91 +189,14 @@ extra_header_fields:
> .quad 0 # CertificationTable
> .quad 0 # BaseRelocationTable
>
> - # Section table
> -section_table:
> - #
> - # The offset & size fields are filled in by build.c.
> - #
> - .ascii ".setup"
> - .byte 0
> - .byte 0
> - .long 0
> - .long 0x0 # startup_{32,64}
> - .long 0 # Size of initialized data
> - # on disk
> - .long 0x0 # startup_{32,64}
> - .long 0 # PointerToRelocations
> - .long 0 # PointerToLineNumbers
> - .word 0 # NumberOfRelocations
> - .word 0 # NumberOfLineNumbers
> - .long IMAGE_SCN_CNT_CODE | \
> - IMAGE_SCN_MEM_READ | \
> - IMAGE_SCN_MEM_EXECUTE | \
> - IMAGE_SCN_ALIGN_16BYTES # Characteristics
> -
> - #
> - # The EFI application loader requires a relocation section
> - # because EFI applications must be relocatable. The .reloc
> - # offset & size fields are filled in by build.c.
> #
> - .ascii ".reloc"
> - .byte 0
> - .byte 0
> - .long 0
> - .long 0
> - .long 0 # SizeOfRawData
> - .long 0 # PointerToRawData
> - .long 0 # PointerToRelocations
> - .long 0 # PointerToLineNumbers
> - .word 0 # NumberOfRelocations
> - .word 0 # NumberOfLineNumbers
> - .long IMAGE_SCN_CNT_INITIALIZED_DATA | \
> - IMAGE_SCN_MEM_READ | \
> - IMAGE_SCN_MEM_DISCARDABLE | \
> - IMAGE_SCN_ALIGN_1BYTES # Characteristics
> -
> -#ifdef CONFIG_EFI_MIXED
> - #
> - # The offset & size fields are filled in by build.c.
> + # Section table
> + # It is generated by build.c and here we just need
> + # to reserve some space for sections
> #
> - .asciz ".compat"
> - .long 0
> - .long 0x0
> - .long 0 # Size of initialized data
> - # on disk
> - .long 0x0
> - .long 0 # PointerToRelocations
> - .long 0 # PointerToLineNumbers
> - .word 0 # NumberOfRelocations
> - .word 0 # NumberOfLineNumbers
> - .long IMAGE_SCN_CNT_INITIALIZED_DATA | \
> - IMAGE_SCN_MEM_READ | \
> - IMAGE_SCN_MEM_DISCARDABLE | \
> - IMAGE_SCN_ALIGN_1BYTES # Characteristics
> -#endif
> +section_table:
> + .fill 40*5, 1, 0
>
> - #
> - # The offset & size fields are filled in by build.c.
> - #
> - .ascii ".text"
> - .byte 0
> - .byte 0
> - .byte 0
> - .long 0
> - .long 0x0 # startup_{32,64}
> - .long 0 # Size of initialized data
> - # on disk
> - .long 0x0 # startup_{32,64}
> - .long 0 # PointerToRelocations
> - .long 0 # PointerToLineNumbers
> - .word 0 # NumberOfRelocations
> - .word 0 # NumberOfLineNumbers
> - .long IMAGE_SCN_CNT_CODE | \
> - IMAGE_SCN_MEM_READ | \
> - IMAGE_SCN_MEM_EXECUTE | \
> - IMAGE_SCN_ALIGN_16BYTES # Characteristics
> -
> - .set section_count, (. - section_table) / 40
> #endif /* CONFIG_EFI_STUB */
>
> # Kernel attributes; used by setup. This is part 1 of the
> diff --git a/arch/x86/boot/tools/build.c b/arch/x86/boot/tools/build.c
> index fbc5315af032..ac6159b76a13 100644
> --- a/arch/x86/boot/tools/build.c
> +++ b/arch/x86/boot/tools/build.c
> @@ -61,8 +61,10 @@ uint8_t buf[SETUP_SECT_MAX*SECTOR_SIZE];
>
> #ifdef CONFIG_EFI_MIXED
> #define PECOFF_COMPAT_RESERVE 0x20
> +#define COMPAT_SECTION_SIZE 0x8
> #else
> #define PECOFF_COMPAT_RESERVE 0x0
> +#define COMPAT_SECTION_SIZE 0x0
> #endif
>
> #define RELOC_SECTION_SIZE 10
> @@ -117,6 +119,7 @@ static unsigned long efi_pe_entry;
> static unsigned long efi32_pe_entry;
> static unsigned long kernel_info;
> static unsigned long startup_64;
> +static unsigned long _rodata;
> static unsigned long _ehead;
> static unsigned long _end;
>
> @@ -258,122 +261,177 @@ static void *map_output_file(const char *path, size_t size)
>
> #ifdef CONFIG_EFI_STUB
>
> -static void update_pecoff_section_header_fields(char *section_name, uint32_t vma,
> - uint32_t size, uint32_t datasz,
> - uint32_t offset)
> +static unsigned int reloc_offset;
> +static unsigned int compat_offset;
> +
> +#define MAX_SECTIONS 5
> +
> +static void emit_pecoff_section(const char *section_name, unsigned int size,
> + unsigned int bss, unsigned int *file_offset,
> + unsigned int *mem_offset, uint32_t flags)
> {
> - unsigned int pe_header;
> + unsigned int section_memsz, section_filesz;
> + unsigned int name_len;
> unsigned short num_sections;
> + struct pe_hdr *hdr = get_pe_header(buf);
> struct section_header *section;
>
> - struct pe_hdr *hdr = get_pe_header(buf);
> num_sections = get_unaligned_le16(&hdr->sections);
> - section = get_sections(buf);
> + if (num_sections >= MAX_SECTIONS)
> + die("Not enough space to generate all sections");
>
> - while (num_sections > 0) {
> - if (strncmp(section->name, section_name, 8) == 0) {
> - /* section header size field */
> - put_unaligned_le32(size, &section->virtual_size);
> + section = get_sections(buf) + num_sections;
>
> - /* section header vma field */
> - put_unaligned_le32(vma, &section->virtual_address);
> + if ((size & (FILE_ALIGNMENT - 1)) || (bss & (FILE_ALIGNMENT - 1)))
> + die("Section '%s' is improperly aligned", section_name);
>
> - /* section header 'size of initialised data' field */
> - put_unaligned_le32(datasz, &section->raw_data_size);
> + section_memsz = round_up(size + bss, SECTION_ALIGNMENT);
> + section_filesz = round_up(size, FILE_ALIGNMENT);
>
> - /* section header 'file offset' field */
> - put_unaligned_le32(offset, &section->data_addr);
> + /* Zero out all section fields */
> + memset(section, 0, sizeof(*section));
>
> - break;
> - }
> - section++;
> - num_sections--;
> - }
> -}
> + name_len = strlen(section_name);
> + if (name_len > sizeof(section->name))
> + name_len = sizeof(section_name);
>
> -static void update_pecoff_section_header(char *section_name, uint32_t offset, uint32_t size)
> -{
> - update_pecoff_section_header_fields(section_name, offset, size, size, offset);
> + /* Section header size field */
> + memcpy(section->name, section_name, name_len);
> +
> + put_unaligned_le32(section_memsz, &section->virtual_size);
> + put_unaligned_le32(*mem_offset, &section->virtual_address);
> + put_unaligned_le32(section_filesz, &section->raw_data_size);
> + put_unaligned_le32(*file_offset, &section->data_addr);
> + put_unaligned_le32(flags, &section->flags);
> +
> + put_unaligned_le16(num_sections + 1, &hdr->sections);
> +
> + *mem_offset += section_memsz;
> + *file_offset += section_filesz;
> }
>
> -static void update_pecoff_setup_and_reloc(unsigned int size)
> +#define BASE_RVA 0x1000
> +
> +static unsigned int text_rva;
> +
> +static unsigned int update_pecoff_sections(unsigned int setup_size,
> + unsigned int file_size,
> + unsigned int virt_size,
> + unsigned int text_size)
> {
> - uint32_t setup_offset = SECTOR_SIZE;
> - uint32_t reloc_offset = size - PECOFF_RELOC_RESERVE - PECOFF_COMPAT_RESERVE;
> -#ifdef CONFIG_EFI_MIXED
> - uint32_t compat_offset = reloc_offset + PECOFF_RELOC_RESERVE;
> -#endif
> - uint32_t setup_size = reloc_offset - setup_offset;
> + /* First section starts at 512 byes, after PE header */
> + unsigned int mem_offset = BASE_RVA, file_offset = SECTOR_SIZE;
> + unsigned int compat_size, reloc_size;
> + unsigned int bss_size, text_rva_diff, reloc_rva;
> + pe_opt_hdr *opt_hdr = get_pe_opt_header(buf);
> + struct pe_hdr *hdr = get_pe_header(buf);
> + struct data_dirent *base_reloc;
> +
> + if (get_unaligned_le32(&hdr->sections))
> + die("Some sections present in PE file");
>
> - update_pecoff_section_header(".setup", setup_offset, setup_size);
> - update_pecoff_section_header(".reloc", reloc_offset, PECOFF_RELOC_RESERVE);
> + reloc_size = round_up(RELOC_SECTION_SIZE, FILE_ALIGNMENT);
> + compat_size = round_up(COMPAT_SECTION_SIZE, FILE_ALIGNMENT);
> + virt_size = round_up(virt_size, SECTION_ALIGNMENT);
>
> /*
> - * Modify .reloc section contents with a single entry. The
> - * relocation is applied to offset 10 of the relocation section.
> + * Update sections offsets.
> + * NOTE: Order is important
> */
> - put_unaligned_le32(reloc_offset + RELOC_SECTION_SIZE, &buf[reloc_offset]);
> - put_unaligned_le32(RELOC_SECTION_SIZE, &buf[reloc_offset + 4]);
>
> + bss_size = virt_size - file_size;
> +
> + emit_pecoff_section(".setup", setup_size - SECTOR_SIZE, 0,
> + &file_offset, &mem_offset, SCN_RO |
> + IMAGE_SCN_CNT_INITIALIZED_DATA);
> +
> + text_rva_diff = mem_offset - file_offset;
> + text_rva = mem_offset;
> + emit_pecoff_section(".text", text_size, 0,
> + &file_offset, &mem_offset, SCN_RX |
> + IMAGE_SCN_CNT_CODE);
> +
> + /* Check that kernel sections mapping is contiguous */
> + if (text_rva_diff != mem_offset - file_offset)
> + die("Kernel sections mapping is wrong: %#x != %#x",
> + mem_offset - file_offset, text_rva_diff);
> +
> + emit_pecoff_section(".data", file_size - text_size, bss_size,
> + &file_offset, &mem_offset, SCN_RW |
> + IMAGE_SCN_CNT_INITIALIZED_DATA);
> +
> + reloc_offset = file_offset;
> + reloc_rva = mem_offset;
> + emit_pecoff_section(".reloc", reloc_size, 0,
> + &file_offset, &mem_offset, SCN_RW |
> + IMAGE_SCN_CNT_INITIALIZED_DATA |
> + IMAGE_SCN_MEM_DISCARDABLE);
> +
> + compat_offset = file_offset;
> #ifdef CONFIG_EFI_MIXED
> - update_pecoff_section_header(".compat", compat_offset, PECOFF_COMPAT_RESERVE);
> + emit_pecoff_section(".comat", compat_size, 0,
> + &file_offset, &mem_offset, SCN_RW |
> + IMAGE_SCN_CNT_INITIALIZED_DATA |
> + IMAGE_SCN_MEM_DISCARDABLE);
> +#endif
>
> + if (file_size + setup_size + reloc_size + compat_size != file_offset)
> + die("file_size(%#x) != filesz(%#x)",
> + file_size + setup_size + reloc_size + compat_size, file_offset);
> +
> + /* Size of code. */
> + put_unaligned_le32(round_up(text_size, SECTION_ALIGNMENT), &opt_hdr->text_size);
> /*
> - * Put the IA-32 machine type (0x14c) and the associated entry point
> - * address in the .compat section, so loaders can figure out which other
> - * execution modes this image supports.
> + * Size of data.
> + * Exclude text size and first sector, which contains PE header.
> */
> - buf[compat_offset] = 0x1;
> - buf[compat_offset + 1] = 0x8;
> - put_unaligned_le16(IMAGE_FILE_MACHINE_I386, &buf[compat_offset + 2]);
> - put_unaligned_le32(efi32_pe_entry + size, &buf[compat_offset + 4]);
> -#endif
> -}
> + put_unaligned_le32(mem_offset - round_up(text_size, SECTION_ALIGNMENT),
> + &opt_hdr->data_size);
>
> -static unsigned int update_pecoff_sections(unsigned int text_start, unsigned int text_sz,
> - unsigned int init_sz)
> -{
> - unsigned int file_sz = text_start + text_sz;
> - unsigned int bss_sz = init_sz - file_sz;
> - pe_opt_hdr *hdr = get_pe_opt_header(buf);
> + /* Size of image. */
> + put_unaligned_le32(mem_offset, &opt_hdr->image_size);
>
> /*
> - * The PE/COFF loader may load the image at an address which is
> - * misaligned with respect to the kernel_alignment field in the setup
> - * header.
> - *
> - * In order to avoid relocating the kernel to correct the misalignment,
> - * add slack to allow the buffer to be aligned within the declared size
> - * of the image.
> + * Address of entry point for PE/COFF executable
> */
> - bss_sz += CONFIG_PHYSICAL_ALIGN;
> - init_sz += CONFIG_PHYSICAL_ALIGN;
> + put_unaligned_le32(text_rva + efi_pe_entry, &opt_hdr->entry_point);
>
> /*
> - * Size of code: Subtract the size of the first sector (512 bytes)
> - * which includes the header.
> + * BaseOfCode for PE/COFF executable
> */
> - put_unaligned_le32(file_sz - SECTOR_SIZE + bss_sz, &hdr->text_size);
> -
> - /* Size of image */
> - put_unaligned_le32(init_sz, &hdr->image_size);
> + put_unaligned_le32(text_rva, &opt_hdr->code_base);
>
> /*
> - * Address of entry point for PE/COFF executable
> + * Since we have generated .reloc section, we need to
> + * fill-in Reloc directory
> */
> - put_unaligned_le32(text_start + efi_pe_entry, &hdr->entry_point);
> + base_reloc = &get_data_dirs(buf)->base_relocations;
> + put_unaligned_le32(reloc_rva, &base_reloc->virtual_address);
> + put_unaligned_le32(RELOC_SECTION_SIZE, &base_reloc->size);
>
> - update_pecoff_section_header_fields(".text", text_start, text_sz + bss_sz,
> - text_sz, text_start);
> -
> - return text_start + file_sz;
> + return file_offset;
> }
>
> -static int reserve_pecoff_reloc_section(int c)
> +static void generate_pecoff_section_data(uint8_t *output)
> {
> - /* Reserve 0x20 bytes for .reloc section */
> - memset(buf+c, 0, PECOFF_RELOC_RESERVE);
> - return PECOFF_RELOC_RESERVE;
> + /*
> + * Modify .reloc section contents with a two entries. The
> + * relocation is applied to offset 10 of the relocation section.
> + */
> + put_unaligned_le32(reloc_offset + RELOC_SECTION_SIZE, &output[reloc_offset]);
> + put_unaligned_le32(RELOC_SECTION_SIZE, &output[reloc_offset + 4]);
> +
> +#ifdef CONFIG_EFI_MIXED
> + /*
> + * Put the IA-32 machine type (0x14c) and the associated entry point
> + * address in the .compat section, so loaders can figure out which other
> + * execution modes this image supports.
> + */
> + output[compat_offset] = 0x1;
> + output[compat_offset + 1] = 0x8;
> + put_unaligned_le16(IMAGE_FILE_MACHINE_I386, &output[compat_offset + 2]);
> + put_unaligned_le32(efi32_pe_entry + text_rva, &output[compat_offset + 4]);
> +#endif
> }
>
> static void efi_stub_update_defaults(void)
> @@ -407,26 +465,10 @@ static void efi_stub_entry_update(void)
>
> #else
>
> -static inline void update_pecoff_setup_and_reloc(unsigned int size) {}
> -static inline void update_pecoff_text(unsigned int text_start,
> - unsigned int file_sz,
> - unsigned int init_sz) {}
> -static inline void efi_stub_update_defaults(void) {}
> -static inline void efi_stub_entry_update(void) {}
> +static void efi_stub_update_defaults(void) {}
>
> -static inline int reserve_pecoff_reloc_section(int c)
> -{
> - return 0;
> -}
> #endif /* CONFIG_EFI_STUB */
>
> -static int reserve_pecoff_compat_section(int c)
> -{
> - /* Reserve 0x20 bytes for .compat section */
> - memset(buf+c, 0, PECOFF_COMPAT_RESERVE);
> - return PECOFF_COMPAT_RESERVE;
> -}
> -
> /*
> * Parse zoffset.h and find the entry points. We could just #include zoffset.h
> * but that would mean tools/build would have to be rebuilt every time. It's
> @@ -456,6 +498,7 @@ static void parse_zoffset(char *fname)
> PARSE_ZOFS(p, efi32_pe_entry);
> PARSE_ZOFS(p, kernel_info);
> PARSE_ZOFS(p, startup_64);
> + PARSE_ZOFS(p, _rodata);
> PARSE_ZOFS(p, _ehead);
> PARSE_ZOFS(p, _end);
>
> @@ -489,10 +532,6 @@ static unsigned int read_setup(char *path)
>
> fclose(file);
>
> - /* Reserve space for PE sections */
> - file_size += reserve_pecoff_compat_section(file_size);
> - file_size += reserve_pecoff_reloc_section(file_size);
> -
> /* Pad unused space with zeros */
>
> setup_size = round_up(file_size, SECTOR_SIZE);
> @@ -515,7 +554,6 @@ int main(int argc, char **argv)
> size_t kern_file_size;
> unsigned int setup_size;
> unsigned int setup_sectors;
> - unsigned int init_size;
> unsigned int total_size;
> unsigned int kern_size;
> void *kernel;
> @@ -540,8 +578,7 @@ int main(int argc, char **argv)
>
> #ifdef CONFIG_EFI_STUB
> /* PE specification require 512-byte minimum section file alignment */
> - kern_size = round_up(kern_file_size + 4, SECTOR_SIZE);
> - update_pecoff_setup_and_reloc(setup_size);
> + kern_size = round_up(kern_file_size + 4, FILE_ALIGNMENT);
> #else
> /* Number of 16-byte paragraphs, including space for a 4-byte CRC */
> kern_size = round_up(kern_file_size + 4, PARAGRAPH_SIZE);
> @@ -554,33 +591,12 @@ int main(int argc, char **argv)
> /* Update kernel_info offset. */
> put_unaligned_le32(kernel_info, &buf[0x268]);
>
> - init_size = get_unaligned_le32(&buf[0x260]);
> -
> #ifdef CONFIG_EFI_STUB
> - /*
> - * The decompression buffer will start at ImageBase. When relocating
> - * the compressed kernel to its end, we must ensure that the head
> - * section does not get overwritten. The head section occupies
> - * [i, i + _ehead), and the destination is [init_sz - _end, init_sz).
> - *
> - * At present these should never overlap, because 'i' is at most 32k
> - * because of SETUP_SECT_MAX, '_ehead' is less than 1k, and the
> - * calculation of INIT_SIZE in boot/header.S ensures that
> - * 'init_sz - _end' is at least 64k.
> - *
> - * For future-proofing, increase init_sz if necessary.
> - */
> -
> - if (init_size - _end < setup_size + _ehead) {
> - init_size = round_up(setup_size + _ehead + _end, SECTION_ALIGNMENT);
> - put_unaligned_le32(init_size, &buf[0x260]);
> - }
>
> - total_size = update_pecoff_sections(setup_size, kern_size, init_size);
> + total_size = update_pecoff_sections(setup_size, kern_size, _end, _rodata);
>
> efi_stub_entry_update();
> #else
> - (void)init_size;
> total_size = setup_size + kern_size;
> #endif
>
> @@ -590,6 +606,10 @@ int main(int argc, char **argv)
> memcpy(output + setup_size, kernel, kern_file_size);
> memset(output + setup_size + kern_file_size, 0, kern_size - kern_file_size);
>
> +#ifdef CONFIG_EFI_STUB
> + generate_pecoff_section_data(output);
> +#endif
> +
> /* Calculate and write kernel checksum. */
> crc = partial_crc32(output, total_size - 4, crc);
> put_unaligned_le32(crc, &output[total_size - 4]);
> diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
> index 1d1ab1911fd3..1f0a2e7075c3 100644
> --- a/drivers/firmware/efi/libstub/x86-stub.c
> +++ b/drivers/firmware/efi/libstub/x86-stub.c
> @@ -389,8 +389,11 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
>
> hdr = &boot_params->hdr;
>
> - /* Copy the setup header from the second sector to boot_params */
> - memcpy(&hdr->jump, image_base + 512,
> + /*
> + * Copy the setup header from the second sector
> + * (mapped to image_base + 0x1000) to boot_params
> + */
> + memcpy(&hdr->jump, image_base + 0x1000,
> sizeof(struct setup_header) - offsetof(struct setup_header, jump));
>
> /*
> --
> 2.37.4
>

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