X-Git-Url: https://git.saurik.com/apple/dyld.git/blobdiff_plain/d3f1e533acc7f70659b8bde9b6c040974f05e03b..bc3b7c8cda49ed8598284a489c0bb9694c67c6a4:/testing/kernel-cache-tests/kext-vtable-patching/test.py

diff --git a/testing/kernel-cache-tests/kext-vtable-patching/test.py b/testing/kernel-cache-tests/kext-vtable-patching/test.py
new file mode 100644
index 0000000..088713b
--- /dev/null
+++ b/testing/kernel-cache-tests/kext-vtable-patching/test.py
@@ -0,0 +1,53 @@
+#!/usr/bin/python2.7
+
+import os
+import KernelCollection
+
+# This verifies that a kext can bind to another kext
+# foo.kext exports foo and bar.kext uses it
+
+def check(kernel_cache):
+    kernel_cache.buildKernelCollection("x86_64", "/kext-vtable-patching/main.kc", "/kext-vtable-patching/main.kernel", "/kext-vtable-patching/extensions", ["com.apple.foo", "com.apple.bar"], [])
+    kernel_cache.analyze("/kext-vtable-patching/main.kc", ["-layout", "-arch", "x86_64"])
+
+    assert len(kernel_cache.dictionary()["dylibs"]) == 3
+    assert kernel_cache.dictionary()["dylibs"][0]["name"] == "com.apple.kernel"
+    assert kernel_cache.dictionary()["dylibs"][1]["name"] == "com.apple.bar"
+    assert kernel_cache.dictionary()["dylibs"][2]["name"] == "com.apple.foo"
+
+    # Get the addresses for the symbols we are looking at.  This will make it easier to work out the fixup slots
+    kernel_cache.analyze("/kext-vtable-patching/main.kc", ["-symbols", "-arch", "x86_64"])
+    
+    # From bar, find the vtable and its override of foo()
+    # Bar::foo()
+    assert kernel_cache.dictionary()["dylibs"][1]["global-symbols"][3]["name"] == "__ZN3Bar3fooEv"
+    assert kernel_cache.dictionary()["dylibs"][1]["global-symbols"][3]["vmAddr"] == "0x16F10"
+    
+    # From foo, we want to know where the vtable is, and the foo() and fooUsed0() slots in that vtable
+    # Foo::foo()
+    assert kernel_cache.dictionary()["dylibs"][2]["global-symbols"][6]["name"] == "__ZN3Foo3fooEv"
+    assert kernel_cache.dictionary()["dylibs"][2]["global-symbols"][6]["vmAddr"] == "0x17ED0"
+    # Foo::fooUsed0()
+    assert kernel_cache.dictionary()["dylibs"][2]["global-symbols"][7]["name"] == "__ZN3Foo8fooUsed0Ev"
+    assert kernel_cache.dictionary()["dylibs"][2]["global-symbols"][7]["vmAddr"] == "0x17EF0"
+
+
+    # Check the fixups
+    kernel_cache.analyze("/kext-vtable-patching/main.kc", ["-fixups", "-arch", "x86_64"])
+    
+    # In vtable for Foo, we match the entry for Foo::foo() by looking for its value on the RHS of the fixup
+    assert kernel_cache.dictionary()["fixups"]["0x1D3E0"] == "kc(0) + 0x17ED0"
+    # Then the following fixup should be to Foo::fooUsed0()
+    assert kernel_cache.dictionary()["fixups"]["0x1D3E8"] == "kc(0) + 0x17EF0"
+
+    # Now in bar, again match the entry for its Bar::foo() symbol
+    assert kernel_cache.dictionary()["fixups"]["0x1D150"] == "kc(0) + 0x16F10"
+    # And if the patching was correct, then following entry should be to Foo::fooUsed0()
+    assert kernel_cache.dictionary()["fixups"]["0x1D158"] == "kc(0) + 0x17EF0"
+
+
+# [~]> xcrun -sdk macosx.internal cc -arch x86_64 -Wl,-static -mkernel -nostdlib -Wl,-e,__start -Wl,-pie main.cpp -Wl,-pagezero_size,0x0 -o main.kernel -Wl,-image_base,0x10000 -Wl,-segaddr,__HIB,0x4000 -Wl,-add_split_seg_info -Wl,-install_name,/usr/lib/swift/split.seg.v2.hack -iwithsysroot /System/Library/Frameworks/Kernel.framework/Headers -Wl,-sectcreate,__LINKINFO,__symbolsets,SymbolSets.plist -Wl,-segprot,__LINKINFO,r--,r--
+# [~]> xcrun -sdk macosx.internal cc -arch x86_64 -Wl,-kext -mkernel -nostdlib -Wl,-add_split_seg_info -Wl,-no_data_const foo.cpp -o extensions/foo.kext/foo -iwithsysroot /System/Library/Frameworks/Kernel.framework/Headers -DFOO_USED=1
+# [~]> xcrun -sdk macosx.internal cc -arch x86_64 -Wl,-kext -mkernel -nostdlib -Wl,-add_split_seg_info -Wl,-no_data_const bar.cpp -o extensions/bar.kext/bar -iwithsysroot /System/Library/Frameworks/Kernel.framework/Headers
+# [~]> rm -r extensions/*.kext/*.ld
+