forked from OSchip/llvm-project
c88fedef2a
DFSan at store does store shadow data; store app data; and at load does load shadow data; load app data. When an application data is atomic, one overtainting case is thread A: load shadow thread B: store shadow thread B: store app thread A: load app If the application address had been used by other flows, thread A reads previous shadow, causing overtainting. The change is similar to MSan's solution. 1) enforce ordering of app load/store 2) load shadow after load app; store shadow before shadow app 3) do not track atomic store by reseting its shadow to be 0. The last one is to address a case like this. Thread A: load app Thread B: store shadow Thread A: load shadow Thread B: store app This approach eliminates overtainting as a trade-off between undertainting flows via shadow data race. Note that this change addresses only native atomic instructions, but does not support builtin libcalls yet. https://llvm.org/docs/Atomics.html#libcalls-atomic Reviewed-by: morehouse Differential Revision: https://reviews.llvm.org/D97310 |
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| lib | ||
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| tools | ||
| unittests | ||
| utils | ||
| www | ||
| .clang-tidy | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CODE_OWNERS.TXT | ||
| CREDITS.TXT | ||
| LICENSE.TXT | ||
| README.txt | ||
README.txt
Compiler-RT ================================ This directory and its subdirectories contain source code for the compiler support routines. Compiler-RT is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. ================================