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@@ -0,0 +1,97 @@
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+#!/usr/bin/env python3
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+
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+# Dynamic linking consistency checker
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+# hacked together by _that@xda, 2014-12 to 2022-03
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+
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+import os
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+import string
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+import argparse
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+
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+
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+def ldcheck(files, libpath, printalldefined, printresolved, demangle):
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+ nmopts = "-C" if demangle else ""
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+ libs = files
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+ libswithpath = []
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+
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+ # find all dependencies
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+ for filename in libs:
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+ if not os.path.isfile(filename) and libpath:
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+ filename = findlibraryinpath(filename, libpath)
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+ libswithpath.append(filename)
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+ with os.popen("readelf -d {0} | grep '\(NEEDED\)' | sed -r 's/.*\[(.*)\]/\\1/'".format(filename)) as f:
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+ for line in f:
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+ dependency = line.rstrip()
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+ if dependency not in libs:
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+ libs.append(dependency)
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+
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+ print("libs:", libswithpath)
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+ libsused = set((libswithpath[0],))
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+
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+ # read all defined symbols
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+ syms = {}
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+ for filename in libswithpath:
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+ for sym in readsymbols(filename, nmopts):
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+ if sym["type"] != "U":
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+ # TODO: support symbols defined by multiple libs properly, and weak symbols
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+ # TODO: more proper handling of symbol versions, see https://maskray.me/blog/2020-11-26-all-about-symbol-versioning
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+ if "@@" in sym["name"]:
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+ syms[sym["name"].replace("@@", "@")] = {"type": sym["type"], "file": filename}
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+ syms[sym["name"].split("@@")[0]] = {"type": sym["type"], "file": filename}
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+ else:
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+ syms[sym["name"]] = {"type": sym["type"], "file": filename}
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+
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+ # resolve unresolved
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+ for filename in libswithpath:
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+ for sym in readsymbols(filename, nmopts):
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+ if sym["type"] == "U":
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+ resolved = syms.get(sym["name"])
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+ if resolved:
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+ if filename in libsused:
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+ libsused.add(resolved["file"])
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+ if printresolved:
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+ print("{0:25} {1:25} {2} {3}".format(filename, resolved["file"], resolved["type"], sym["name"]))
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+ else:
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+ print("{0:25} {1:25} U {2}".format(filename, "UNRESOLVED #####", sym["name"]))
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+ else:
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+ if printalldefined:
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+ print("{0:25} {1}".format(filename, sym["line"]))
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+
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+ unused = set(libswithpath) - libsused
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+ if unused:
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+ print("unused:", unused)
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+
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+
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+def findlibraryinpath(filename, searchpath):
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+ for d in searchpath.split(os.pathsep):
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+ filepath = os.path.join(d, filename)
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+ if os.path.isfile(filepath):
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+ return filepath
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+ return filename
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+
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+
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+"""
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+output format of nm:
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+00003004 A __bss_start
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+ U __cxa_atexit
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+"""
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+def readsymbol(line):
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+ s = line if line[0] == " " else line.lstrip(string.hexdigits)
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+ s = s.lstrip()
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+ return {"type": s[0], "name": s[2:], "line": line}
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+
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+
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+def readsymbols(filename, nmopts=""):
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+ with os.popen("nm -D {0} {1}".format(nmopts, filename)) as f:
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+ for line in f:
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+ yield readsymbol(line.rstrip())
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+
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+if __name__ == "__main__":
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+ parser = argparse.ArgumentParser(description='Check dynamic linkage consistency by matching defined vs unresolved symbols.')
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+ parser.add_argument('files', metavar='FILE', nargs='+', help="a dynamically linked executable or library.")
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+ parser.add_argument('-p', '--path', help="Search path for libraries (use like LD_LIBRARY_PATH)")
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+ parser.add_argument('-r', '--resolved', action='store_true', help="Print resolved symbols. By default only unresolved symbols are printed.")
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+ parser.add_argument('-a', '--alldefined', action='store_true', help="Print all defined symbols")
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+ parser.add_argument('-d', '--demangle', action='store_true', help="Demangle C++ names")
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+
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+ args = parser.parse_args()
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+ ldcheck(args.files, args.path, args.alldefined, args.resolved, args.demangle)
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Samuel kendall
1 سال پیش