system/systemd
system/systemd
1
0
Fork 0
mirror of https://github.com/systemd/systemd synced 2024-10-07 00:30:59 +00:00
Code Issues Packages Projects Releases Wiki Activity

elf2efi: Check ELF image base if possible

Browse source
This commit is contained in:
Jan Janssen 2023-09-28 16:22:13 +02:00
parent 142f0c61a3
commit 5713c50d84
1 changed files with 7 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
tools/elf2efi.py
View file

@ -348,7 +348,6 @@ def apply_elf_relative_relocation(
addend = target.data[addend_offset : addend_offset + addend_size]
addend = int.from_bytes(addend, byteorder="little")
# This currently assumes that the ELF file has an image base of 0.
value = (image_base + addend).to_bytes(addend_size, byteorder="little")
target.data[addend_offset : addend_offset + addend_size] = value
@ -417,6 +416,13 @@ def convert_elf_relocations(
if not flags_tag["d_val"] & ENUM_DT_FLAGS_1["DF_1_PIE"]:
raise RuntimeError("ELF file is not a PIE.")
# This checks that the ELF image base is 0.
symtab = elf.get_section_by_name(".symtab")
if symtab:
exe_start = symtab.get_symbol_by_name("__executable_start")
if exe_start and exe_start[0]["st_value"] != 0:
raise RuntimeError("Unexpected ELF image base.")
opt.SizeOfHeaders = align_to(
PE_OFFSET
+ len(PE_MAGIC)