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commit bd13cb19f5e15e9e9a92a536e755fd93a97a67f6
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Fri Aug 19 11:16:32 2022 +0200
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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
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gnu_hash functions.
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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Tested-by: Carlos O'Donell <carlos@redhat.com>
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diff --git a/elf/tst-glibcelf.py b/elf/tst-glibcelf.py
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index bf15a3bad4479e08..e5026e2289df206b 100644
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--- a/elf/tst-glibcelf.py
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+++ b/elf/tst-glibcelf.py
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@@ -240,6 +240,24 @@ def check_constant_values(cc):
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error('{}: glibcelf has {!r}, <elf.h> has {!r}'.format(
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name, glibcelf_value, elf_h_value))
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+def check_hashes():
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+ for name, expected_elf, expected_gnu in (
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+ ('', 0, 0x1505),
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+ ('PPPPPPPPPPPP', 0, 0x9f105c45),
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+ ('GLIBC_2.0', 0xd696910, 0xf66c3dd5),
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+ ('GLIBC_2.34', 0x69691b4, 0xc3f3f90c),
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+ ('GLIBC_PRIVATE', 0x963cf85, 0x692a260)):
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+ for convert in (lambda x: x, lambda x: x.encode('UTF-8')):
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+ name = convert(name)
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+ actual_elf = glibcelf.elf_hash(name)
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+ if actual_elf != expected_elf:
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+ error('elf_hash({!r}): {:x} != 0x{:x}'.format(
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+ name, actual_elf, expected_elf))
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+ actual_gnu = glibcelf.gnu_hash(name)
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+ if actual_gnu != expected_gnu:
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+ error('gnu_hash({!r}): {:x} != 0x{:x}'.format(
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+ name, actual_gnu, expected_gnu))
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+
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def main():
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"""The main entry point."""
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parser = argparse.ArgumentParser(
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@@ -251,6 +269,7 @@ def main():
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check_duplicates()
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check_constant_prefixes()
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check_constant_values(cc=args.cc)
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+ check_hashes()
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if errors_encountered > 0:
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print("note: errors encountered:", errors_encountered)
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diff --git a/scripts/glibcelf.py b/scripts/glibcelf.py
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index de0509130ed9ad47..5c8f46f590722384 100644
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--- a/scripts/glibcelf.py
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+++ b/scripts/glibcelf.py
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@@ -1158,5 +1158,24 @@ class Image:
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self._stringtab[sh_link] = strtab
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return strtab
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+def elf_hash(s):
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+ """Computes the ELF hash of the string."""
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+ acc = 0
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+ for ch in s:
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+ if type(ch) is not int:
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+ ch = ord(ch)
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+ acc = ((acc << 4) + ch) & 0xffffffff
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+ top = acc & 0xf0000000
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+ acc = (acc ^ (top >> 24)) & ~top
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+ return acc
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+
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+def gnu_hash(s):
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+ """Computes the GNU hash of the string."""
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+ h = 5381
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+ for ch in s:
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+ if type(ch) is not int:
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+ ch = ord(ch)
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+ h = (h * 33 + ch) & 0xffffffff
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+ return h
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__all__ = [name for name in dir() if name[0].isupper()]
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