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scripts/glibcelf.py: Add hashing support

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ELF and GNU hashes can now be computed using the elf_hash and
gnu_hash functions.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer
2022-08-19 11:16:32 +02:00
parent af6b1cce98
commit bd13cb19f5
2 changed files with 38 additions and 0 deletions
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19
elf/tst-glibcelf.py
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@ -240,6 +240,24 @@ def check_constant_values(cc):
error('{}: glibcelf has {!r}, <elf.h> has {!r}'.format( error('{}: glibcelf has {!r}, <elf.h> has {!r}'.format(
name, glibcelf_value, elf_h_value)) name, glibcelf_value, elf_h_value))
def check_hashes():
for name, expected_elf, expected_gnu in (
('', 0, 0x1505),
('PPPPPPPPPPPP', 0, 0x9f105c45),
('GLIBC_2.0', 0xd696910, 0xf66c3dd5),
('GLIBC_2.34', 0x69691b4, 0xc3f3f90c),
('GLIBC_PRIVATE', 0x963cf85, 0x692a260)):
for convert in (lambda x: x, lambda x: x.encode('UTF-8')):
name = convert(name)
actual_elf = glibcelf.elf_hash(name)
if actual_elf != expected_elf:
error('elf_hash({!r}): {:x} != 0x{:x}'.format(
name, actual_elf, expected_elf))
actual_gnu = glibcelf.gnu_hash(name)
if actual_gnu != expected_gnu:
error('gnu_hash({!r}): {:x} != 0x{:x}'.format(
name, actual_gnu, expected_gnu))
def main(): def main():
"""The main entry point.""" """The main entry point."""
parser = argparse.ArgumentParser( parser = argparse.ArgumentParser(
@ -251,6 +269,7 @@ def main():
check_duplicates() check_duplicates()
check_constant_prefixes() check_constant_prefixes()
check_constant_values(cc=args.cc) check_constant_values(cc=args.cc)
check_hashes()
if errors_encountered > 0: if errors_encountered > 0:
print("note: errors encountered:", errors_encountered) print("note: errors encountered:", errors_encountered)

19
scripts/glibcelf.py
View File

@ -1158,5 +1158,24 @@ class Image:
self._stringtab[sh_link] = strtab self._stringtab[sh_link] = strtab
return strtab return strtab
def elf_hash(s):
"""Computes the ELF hash of the string."""
acc = 0
for ch in s:
if type(ch) is not int:
ch = ord(ch)
acc = ((acc << 4) + ch) & 0xffffffff
top = acc & 0xf0000000
acc = (acc ^ (top >> 24)) & ~top
return acc
def gnu_hash(s):
"""Computes the GNU hash of the string."""
h = 5381
for ch in s:
if type(ch) is not int:
ch = ord(ch)
h = (h * 33 + ch) & 0xffffffff
return h
__all__ = [name for name in dir() if name[0].isupper()] __all__ = [name for name in dir() if name[0].isupper()]