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License headers #2
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Summary: This adds Apache 2 license headers to all of Profilo Closes #2 Reviewed By: tmelz Differential Revision: D7246618 Pulled By: BurntBrunch fbshipit-source-id: 4973a806c04f61e93a3d11f4edbe29fb5970e5dc
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Summary: Pull Request resolved: facebookincubator/fbjni#2 Want these to be included in Open Source fbjni. Reviewed By: passy Differential Revision: D17139151 fbshipit-source-id: 18d549fa4cbcc6860e9804abe2b8acdeb405d082
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Summary:
With the `__cxa_throw` hook attached for gnustl, apps will crash if an object without a destructor is thrown:
```
try { throw 0; } catch(...) {}
// or
class SimpleException {};
try { throw SimpleException{}; } catch(...) {}
```
The issue is that the `__cxa_throw` abi has a destructor function pointer parameter, which may be null according to the documentation. In the gnustl region of the code, Lyra doesn't do a null check before invoking it at the following stack:
```
[???] 0X0 [unknown] + 0x0
+libfbjni.so facebook::lyra::(anonymous namespace)::HijackedExceptionTypeInfo::destructor(void*) (./fbandroid/libraries/fbjni/cxx/lyra/cxa_throw.cpp:213)
libgnustl_shared.so 0X759F86716C [unknown] + 0x6116c
libgnustl_shared.so 0X759F8DD2E0 _Unwind_DeleteException + 0x18
```
I wrote a test which repros the issue, and without the fix it crashes with a similar stack:
```
backtrace:
#00 pc 00000000 <unknown>
#1 pc 00022e01 /data/app/com.facebook.builds.fb4a-vhhkGO4NTAZmUTmfS5wpfw==/lib/arm/libfbjni.so (BuildId: 7a0f9db0801e4f451162c28a392cd35d4ba46b9a)
#2 pc 0004fb2d /data/app/com.facebook.lyra.tests-MJNqCBmU7StfOjPoAyfEgg==/lib/arm/libgnustl_shared.so!libgnustl_shared.so (offset 0x4f000) (BuildId: 059ab3ea3d764339fe3ceea2904f54637c89594e)
#3 pc 0009b8e3 /data/app/com.facebook.lyra.tests-MJNqCBmU7StfOjPoAyfEgg==/lib/arm/libgnustl_shared.so!libgnustl_shared.so (offset 0x50000) (_Unwind_DeleteException+12) (BuildId: 059ab3ea3d764339fe3ceea2904f54637c89594e)
#4 pc 0000aeb9 /data/app/com.facebook.lyra.tests-MJNqCBmU7StfOjPoAyfEgg==/lib/arm/liblyra-tests.so (testThatCxaThrowHookThrowsAndSetsTraceTrivialException(facebook::jni::alias_ref<_jclass*>)+220) (BuildId: 31cc0552d685f1ce9e896d1628656cd97096678d)
```
To fix, add a null check before invoking `mutable_info->orig_dest_`, which originates from the destructor parameter.
Reviewed By: smeenai
Differential Revision: D20841003
fbshipit-source-id: 907a13ebf994c5bad511b13ab9684efcbc2ce474
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This adds Apache 2 license headers to all of Profilo