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[efi] Treat writable sections as data sections

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Hybrid bzImage and UEFI binaries (such as wimboot) may include 16-bit
executable code that is opaque data from the perspective of a UEFI PE
binary, as described in wimboot commit fe456ca ("[efi] Use separate
.text and .data PE sections").

The ELF section will be marked as containing both executable code and
writable data.  Choose to treat such a section as a data section
rather than a code section, since that matches the expected semantics
for ELF files that we expect to process.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2023-11-22 23:14:38 +00:00
parent 8c8ead2530
commit 678a60f61d
1 changed files with 11 additions and 11 deletions
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22
src/util/elf2efi.c
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@@ -591,17 +591,7 @@ static struct pe_section * process_section ( struct elf_file *elf,
/* Fill in section characteristics and update RVA limits */ /* Fill in section characteristics and update RVA limits */
if ( ( shdr->sh_type == SHT_PROGBITS ) && if ( ( shdr->sh_type == SHT_PROGBITS ) &&
( shdr->sh_flags & SHF_EXECINSTR ) ) { ( shdr->sh_flags & SHF_WRITE ) ) {
/* .text-type section */
new->hdr.Characteristics =
( EFI_IMAGE_SCN_CNT_CODE |
EFI_IMAGE_SCN_MEM_NOT_PAGED |
EFI_IMAGE_SCN_MEM_EXECUTE |
EFI_IMAGE_SCN_MEM_READ );
applicable_start = &code_start;
applicable_end = &code_end;
} else if ( ( shdr->sh_type == SHT_PROGBITS ) &&
( shdr->sh_flags & SHF_WRITE ) ) {
/* .data-type section */ /* .data-type section */
new->hdr.Characteristics = new->hdr.Characteristics =
( EFI_IMAGE_SCN_CNT_INITIALIZED_DATA | ( EFI_IMAGE_SCN_CNT_INITIALIZED_DATA |
@@ -610,6 +600,16 @@ static struct pe_section * process_section ( struct elf_file *elf,
EFI_IMAGE_SCN_MEM_WRITE ); EFI_IMAGE_SCN_MEM_WRITE );
applicable_start = &data_start; applicable_start = &data_start;
applicable_end = &data_mid; applicable_end = &data_mid;
} else if ( ( shdr->sh_type == SHT_PROGBITS ) &&
( shdr->sh_flags & SHF_EXECINSTR ) ) {
/* .text-type section */
new->hdr.Characteristics =
( EFI_IMAGE_SCN_CNT_CODE |
EFI_IMAGE_SCN_MEM_NOT_PAGED |
EFI_IMAGE_SCN_MEM_EXECUTE |
EFI_IMAGE_SCN_MEM_READ );
applicable_start = &code_start;
applicable_end = &code_end;
} else if ( shdr->sh_type == SHT_PROGBITS ) { } else if ( shdr->sh_type == SHT_PROGBITS ) {
/* .rodata-type section */ /* .rodata-type section */
new->hdr.Characteristics = new->hdr.Characteristics =