testing/kernel-cache-tests/vtable-patching-metaclass-alias/test.py

   1 #!/usr/bin/python2.7
   2
   3 import os
   4 import KernelCollection
   5
   6 # kxld has an implicit alias for a metaclass vtable entry.  Test that we also rewrite that alias
   7
   8 def check(kernel_cache):
   9     kernel_cache.buildKernelCollection("arm64", "/vtable-patching-metaclass-alias/main.kc", "/vtable-patching-metaclass-alias/main.kernel", "/vtable-patching-metaclass-alias/extensions", ["com.apple.foo"], [])
  10     kernel_cache.analyze("/vtable-patching-metaclass-alias/main.kc", ["-layout", "-arch", "arm64"])
  11
  12     assert len(kernel_cache.dictionary()["dylibs"]) == 2
  13     assert kernel_cache.dictionary()["dylibs"][0]["name"] == "com.apple.kernel"
  14     assert kernel_cache.dictionary()["dylibs"][1]["name"] == "com.apple.foo"
  15     assert kernel_cache.dictionary()["dylibs"][1]["segments"][2]["name"] == "__DATA_CONST"
  16     assert kernel_cache.dictionary()["dylibs"][1]["segments"][2]["vmAddr"] == "0x14000"
  17
  18     # Find the address of the symbols to bind to
  19     kernel_cache.analyze("/vtable-patching-metaclass-alias/main.kc", ["-symbols", "-arch", "arm64"])
  20     assert len(kernel_cache.dictionary()["dylibs"]) == 2
  21     assert kernel_cache.dictionary()["dylibs"][0]["name"] == "com.apple.kernel"
  22     assert kernel_cache.dictionary()["dylibs"][0]["global-symbols"][0]["name"] == "__ZN15OSMetaClassBase8DispatchE5IORPC"
  23     assert kernel_cache.dictionary()["dylibs"][0]["global-symbols"][0]["vmAddr"] == "0xC000"
  24
  25     # Check the fixups
  26     kernel_cache.analyze("/vtable-patching-metaclass-alias/main.kc", ["-fixups", "-arch", "arm64"])
  27     assert len(kernel_cache.dictionary()["fixups"]) == 2
  28     assert kernel_cache.dictionary()["fixups"]["0x14000"] == "kc(0) + 0xC000"
  29     assert kernel_cache.dictionary()["fixups"]["0x14008"] == "kc(0) + 0xC000"
  30     assert len(kernel_cache.dictionary()["dylibs"]) == 2
  31     assert kernel_cache.dictionary()["dylibs"][0]["name"] == "com.apple.kernel"
  32     assert kernel_cache.dictionary()["dylibs"][0]["fixups"] == "none"
  33     assert kernel_cache.dictionary()["dylibs"][1]["name"] == "com.apple.foo"
  34     assert kernel_cache.dictionary()["dylibs"][1]["fixups"] == "none"
  35
  36 # [~]> xcrun -sdk iphoneos.internal cc -arch arm64 -Wl,-static -mkernel -nostdlib -Wl,-add_split_seg_info -Wl,-rename_section,__TEXT,__text,__TEXT_EXEC,__text -Wl,-e,__start -Wl,-pagezero_size,0x0 -Wl,-pie main.c -o main.kernel -Wl,-sectcreate,__LINKINFO,__symbolsets,SymbolSets.plist -Wl,-segprot,__LINKINFO,r--,r--
  37 # [~]> xcrun -sdk iphoneos.internal cc -arch arm64 -Wl,-kext -mkernel -nostdlib -Wl,-add_split_seg_info foo.c -o extensions/foo.kext/foo
  38 # [~]> rm -r extensions/foo.kext/*.ld
  39