FYI, here is a hacky script to locate self-PLT entries in x86_64
binaries. It depends on binutils and elfutils and clobbers a file called
'./syms' in order to avoid having to think about deadlocks in rw popen.
8<-----------------------------------
#!/usr/bin/python
import os,sys
def check_file(fn):
f_plt = os.popen("eu-readelf --relocs %s| grep 'X86_64_JUMP_SLOT 0x' | awk
'{print $5}'"%fn)
plt = {}.fromkeys(map(lambda x:x.rstrip("\r\n"), f_plt.readlines()))
del f_plt
f_ref = os.popen("objdump -d %s | egrep '\<callq\>.*@plt' | awk '{print $1
$9}'"%fn)
tmp = map(lambda x:x.split(":"), f_ref.readlines())
del f_ref
refs = []
for x in tmp:
assert(len(x) == 2)
(addr, sym) = x
sym = sym.rstrip(">\r\n").lstrip("<")
assert(len(sym) > 4 and sym[-4:] == '@plt')
sym = sym[:-4]
addr = int(addr, 16)
refs.append((addr,sym))
del tmp
refs = filter(lambda x:plt.has_key(x[1]), refs)
f_eu = os.popen("xargs eu-addr2line -e %s > syms"%fn, 'w')
for (addr,sym) in refs:
f_eu.write("0x%x\n"%addr)
#print "0x%x %s"%(addr,sym)
f_eu.close()
f_eu = open("syms", 'r')
os.unlink("syms")
addrlines = map(lambda x:x.rstrip("\r\n"), f_eu.readlines())
del f_eu
assert(len(addrlines) == len(refs))
for ((addr, sym), line) in zip(refs, addrlines):
print "%s -> %s"%(line, sym)
return True
if __name__ == '__main__':
if len(sys.argv) != 2:
print "Usage: %s <ELF-lib>"%sys.argv[0]
raise SystemExit, 1
if check_file(sys.argv[1]):
raise SystemExit
raise SystemExit, 1
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