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Handle missing dlopen() in libc < 2.34 #16

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Handle missing dlopen() in libc < 2.34 #16

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9 changes: 6 additions & 3 deletions dlinject.py
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Original file line number Diff line number Diff line change
Expand Up @@ -102,20 +102,23 @@ def locate_dl_open(process_maps, mod_name):
else:
return fail

if "libc" in mod_name:
if "libc" in mod_name or "libdl" in mod_name:
dl_open_offset = lookup_elf_symbol(mod_path, "dlopen")
elif "ld-linux" in mod_name:
dl_open_offset = lookup_elf_symbol(mod_path, "_dl_open")
else:
return fail


if dl_open_offset is None:
return fail

return (True, mod_base, mod_path, dl_open_offset)


def dlinject(pid, lib_path, stopmethod="sigstop"):
log("searching for dlopen...")
process_maps = f"/proc/{pid}/maps"
for mod in ["libc", "ld-linux"]:
for mod in ["libc", "libdl", "ld-linux"]:
status, mod_base, mod_path, dl_open_offset = locate_dl_open(process_maps, mod)
if status:
mod_name = mod
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4 changes: 2 additions & 2 deletions example_prog/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ libhello.so: libhello.c
gcc libhello.c -fPIC -shared -o libhello.so

test: test.c
gcc test.c -o test
gcc test.c -ldl -o test

test_threaded: test_threaded.c
gcc test_threaded.c -o test_threaded -lpthread
gcc test_threaded.c -ldl -o test_threaded -lpthread