This project is based on easy-linux-pwn.
Those tasks in the origin project can't be solved on newer android platforms(for example, 9.0). Thare are some differences between android and other linux distributions:
- Android randomizes addresses of dynamic libraries even if ASLR is disabled
- Android-NDK forces '-z noexecstack' option when build executables
So I do some works to port these tasks to Android platform.
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Follow instructions in easy-linux-pwn
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Android 9.0 device
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Build you own Android ROM with the following change. (or just push linker64 to /system/bin/ if you are lucky enough(may brick you device!!!))
diff --git a/linker/linker.cpp b/linker/linker.cpp index c78b9aba6..d20995162 100644 --- a/linker/linker.cpp +++ b/linker/linker.cpp @@ -1493,13 +1493,13 @@ static bool find_library_internal(android_namespace_t* ns, static void soinfo_unload(soinfo* si); -static void shuffle(std::vector<LoadTask*>* v) { - for (size_t i = 0, size = v->size(); i < size; ++i) { - size_t n = size - i; - size_t r = arc4random_uniform(n); - std::swap((*v)[n-1], (*v)[r]); - } -} +// static void shuffle(std::vector<LoadTask*>* v) { +// for (size_t i = 0, size = v->size(); i < size; ++i) { +// size_t n = size - i; +// size_t r = arc4random_uniform(n); +// std::swap((*v)[n-1], (*v)[r]); +// } +// } // add_as_children - add first-level loaded libraries (i.e. library_names[], but // not their transitive dependencies) as children of the start_with library. @@ -1603,7 +1603,7 @@ bool find_libraries(android_namespace_t* ns, load_list.push_back(task); } } - shuffle(&load_list); + // shuffle(&load_list); for (auto&& task : load_list) { if (!task->load()) { diff --git a/linker/linker_phdr.cpp b/linker/linker_phdr.cpp index a5eab44ec..4c6cdf494 100644 --- a/linker/linker_phdr.cpp +++ b/linker/linker_phdr.cpp @@ -548,6 +548,7 @@ static void* ReserveAligned(void* hint, size_t size, size_t align) { uint8_t* first = align_up(mmap_ptr, align); uint8_t* last = align_down(mmap_ptr + mmap_size, align) - size; size_t n = arc4random_uniform((last - first) / PAGE_SIZE + 1); + n = 1; uint8_t* start = first + n * PAGE_SIZE; munmap(mmap_ptr, start - mmap_ptr); munmap(start + size, mmap_ptr + mmap_size - (start + size));
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For task 04 and task 05, make their stacks executable using
switch_execstack$ ./tools/switch_execstack libs/arm64-v8a/04-shellcode-static on $ aarch64-linux-android-readelf -l libs/arm64-v8a/04-shellcode-static ... Program Headers: ... GNU_STACK 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 RWE 10 ... -
Disable ASLR:
adb shell 'echo 0 > /proc/sys/kernel/randomize_va_space' -
Push exectuables to device: /data/local/tmp/
It seems like `one_gadget' does not support android. So task 03 is not work.