103 lines
3.4 KiB
Python
Executable file
103 lines
3.4 KiB
Python
Executable file
#!/usr/bin/env python3
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# ===- lib/dfsan/scripts/build-libc-list.py ---------------------------------===#
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#
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# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#
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# ===------------------------------------------------------------------------===#
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# The purpose of this script is to identify every function symbol in a set of
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# libraries (in this case, libc and libgcc) so that they can be marked as
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# uninstrumented, thus allowing the instrumentation pass to treat calls to those
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# functions correctly.
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# Typical usage will list runtime libraries which are not instrumented by dfsan.
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# This would include libc, and compiler builtins.
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#
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# ./build-libc-list.py \
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# --lib-file=/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 \
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# --lib-file=/lib/x86_64-linux-gnu/libanl.so.1 \
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# --lib-file=/lib/x86_64-linux-gnu/libBrokenLocale.so.1 \
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# --lib-file=/lib/x86_64-linux-gnu/libcidn.so.1 \
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# --lib-file=/lib/x86_64-linux-gnu/libcrypt.so.1 \
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# --lib-file=/lib/x86_64-linux-gnu/libc.so.6 \
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# --lib-file=/lib/x86_64-linux-gnu/libdl.so.2 \
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# --lib-file=/lib/x86_64-linux-gnu/libm.so.6 \
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# --lib-file=/lib/x86_64-linux-gnu/libnsl.so.1 \
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# --lib-file=/lib/x86_64-linux-gnu/libpthread.so.0 \
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# --lib-file=/lib/x86_64-linux-gnu/libresolv.so.2 \
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# --lib-file=/lib/x86_64-linux-gnu/librt.so.1 \
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# --lib-file=/lib/x86_64-linux-gnu/libthread_db.so.1 \
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# --lib-file=/lib/x86_64-linux-gnu/libutil.so.1 \
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# --lib-file=/usr/lib/x86_64-linux-gnu/libc_nonshared.a \
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# --lib-file=/usr/lib/x86_64-linux-gnu/libpthread_nonshared.a \
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# --lib-file=/lib/x86_64-linux-gnu/libgcc_s.so.1 \
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# --lib-file=/usr/lib/gcc/x86_64-linux-gnu/4.6/libgcc.a \
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# --error-missing-lib
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import os
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import subprocess
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import sys
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from optparse import OptionParser
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def defined_function_list(lib):
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"""Get non-local function symbols from lib."""
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functions = []
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readelf_proc = subprocess.Popen(
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["readelf", "-s", "-W", lib], stdout=subprocess.PIPE
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)
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readelf = readelf_proc.communicate()[0].decode().split("\n")
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if readelf_proc.returncode != 0:
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raise subprocess.CalledProcessError(readelf_proc.returncode, "readelf")
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for line in readelf:
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if (
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(line[31:35] == "FUNC" or line[31:36] == "IFUNC")
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and line[39:44] != "LOCAL"
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and line[55:58] != "UND"
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):
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function_name = line[59:].split("@")[0]
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functions.append(function_name)
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return functions
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p = OptionParser()
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p.add_option(
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"--lib-file",
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action="append",
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metavar="PATH",
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help="Specific library files to add.",
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default=[],
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)
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p.add_option(
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"--error-missing-lib",
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action="store_true",
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help="Make this script exit with an error code if any library is missing.",
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dest="error_missing_lib",
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default=False,
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)
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(options, args) = p.parse_args()
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libs = options.lib_file
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if not libs:
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print("No libraries provided.", file=sys.stderr)
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exit(1)
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missing_lib = False
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functions = []
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for l in libs:
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if os.path.exists(l):
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functions += defined_function_list(l)
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else:
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missing_lib = True
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print("warning: library %s not found" % l, file=sys.stderr)
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if options.error_missing_lib and missing_lib:
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print("Exiting with failure code due to missing library.", file=sys.stderr)
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exit(1)
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for f in sorted(set(functions)):
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print("fun:%s=uninstrumented" % f)
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