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elf: add some doc

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This commit is contained in:
William Ballenthin
2021-08-18 14:23:48 -06:00
parent a35f5a1650
commit 89603586da
1 changed files with 4 additions and 0 deletions
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4
capa/features/extractors/elf.py
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@@ -120,6 +120,8 @@ def detect_elf_os(f: BinaryIO) -> str:
logger.warning("failed to read program headers")
e_phnum = 0
# search for PT_NOTE sections that specify an OS
# for example, on Linux there is a GNU section with minimum kernel version
for i in range(e_phnum):
offset = i * e_phentsize
phent = program_headers[offset : offset + e_phentsize]
@@ -192,6 +194,8 @@ def detect_elf_os(f: BinaryIO) -> str:
logger.debug("note owner: %s", "FREEBSD")
ret = OS.FREEBSD if not ret else ret
# search for recognizable dynamic linkers (interpreters)
# for example, on linux, we see file paths like: /lib64/ld-linux-x86-64.so.2
for i in range(e_phnum):
offset = i * e_phentsize
phent = program_headers[offset : offset + e_phentsize]