ElfHooK, came from boyliang's AllHookInOne, fix some bug, dealing with new problem in aarch64.
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NOT DT_HAST in .dynmaic section，but .gun.hash instead.
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NOT DT_REL and DT_RELSZ in .dynmaic section, but DT_ANDROID_REL and DT_ANDROID_RELSZ instead.
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use base_addr to caculate symbol table's offset is wrong，replace it with bias_addr。
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when modify memory page’s read-write permission，set PROT_EXEC and PROT_WRITE together in SEAndroid WILLcrash.
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after hook "dlopen" function, caculate base_addr from return value of old dlopen (it's pointer to soinfo).
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support aarch64 (arm64-v8a)
ref:
AllHookInOne : [https://github.com/boyliang/AllHookInOne.git]
AllHookInOne description : [http://bbs.pediy.com/showthread.php?p=1328038]
bionic : [https://android.googlesource.com/platform/bionic]
export -p PATH=$PATH:$ANDROID_NDK
make
make clean
make install # copy libElfHook.so to jniLibs dir in Demo.
ndk-build NDK_PROJECT_PATH=. NDK_OUT=./objs NDK_LIBS_OUT=./bin APP_BUILD_SCRIPT=./Android.mk APP_PLATFORM=android-23 APP_ABI=arm64-v8a,armeabi-v7a APP_STL=stlport_static
use NDK r11b
elf_module is a shared library or executable, elf_hooker is wrapper of hook function.
- bool elf_hooker::phrase_proc_maps()
phrase /proc/self/maps to create all elf modules have been loadded
- void elf_hooker::dump_module_list()
print all elf moudle's info, base addr and full path.
- void elf_hooker::set_prehook_cb( prehook_cb ):
set a callback function, which would be invoked before hooked. The function with func_name will not be hooked, if it return false. prehook_cb function like this:
bool prehook_cb(const char* module_name, const char* func_name);
module_name: the full filename of shared library or executable.
func_name: function name would be hooked.
- void elf_hooker::hook_all_modules(const char *func_name, void *pfn_new, void** ppfn_old)
hook a function of all the modules, MUST call phrase_proc_maps() before hook_all_modules()
func_name: the name of function that will be hooked.
pfn_new: new function pointer
ppfn_old: return raw function pointer, ppfn_old MUST NOT be NULL
- bool elf_hooker::hook(elf_module *module, const char* func_name, void *pfn_new, void **ppfn_old)
hook a function of a single module.
module: pointer of elf_module.
other parameters is the same as hook_all_modules()