[Tarantool-patches] [PATCH v2 luajit 0/3] Trace abort on FFI sandwich or mode change
Igor Munkin
imun at tarantool.org
Sun Apr 19 23:16:48 MSK 2020
Kirill,
I have no idea what's wrong with Travis, but Gitlab CI is green. Please
proceed with the series.
On 15.04.20, Igor Munkin wrote:
> This series closes two issues related to the JIT machinery behaviour:
> * "FFI sandwich"(*) detection is introduced. If sandwich is detected
> while trace recording the recording is aborted. The sandwich detected
> while mcode execution leads to the platform panic.
> * luaJIT_setmode call is prohibited while mcode execution and leads to
> the platform panic.
>
> (*) The following stack mix is called FFI sandwich.
> | Lua-FFI -> C routine -> Lua-C API -> Lua VM
> This sort of re-entrancy is explicitly not supported by LuaJIT
> compiler. For more info see [1].
>
> Furthermore, this series also provides an aixillary module for LuaJIT
> testing machinery.
>
> [1]: https://github.com/tarantool/tarantool/issues/4427
>
> @ChangeLog:
> * "FFI sandwich"(*) detection is introduced. If sandwich is detected
> while trace recording the recording is aborted. The sandwich detected
> while mcode execution leads to the platform panic.
> * luaJIT_setmode call is prohibited while mcode execution and leads to
> the platform panic.
>
> (*) The following stack mix is called FFI sandwich.
> | Lua-FFI -> C routine -> Lua-C API -> Lua VM
> This sort of re-entrancy is explicitly not supported by LuaJIT
> compiler. For more info see gh-4427.
>
> Branch: https://github.com/tarantool/luajit/tree/imun/ffi-sandwich
>
> Changes in v2:
> * Adjusted naming and commit message considering Sergos' comments.
> * Reworked tests considering Vlad's comments.
> * Fixed VM re-entry via lua_cpcall (many thanks to Vlad's preciseness).
>
> Igor Munkin (3):
> test: add auxillary module for testing
> jit: abort trace recording and execution for C API
> jit: abort trace execution on JIT mode change
>
> src/lj_api.c | 44 ++++++++++++++----
> src/lj_dispatch.c | 6 +++
> src/lj_errmsg.h | 2 +
> test/gh-4427-ffi-sandwich.skipcond | 7 +++
> test/gh-4427-ffi-sandwich.test.lua | 49 ++++++++++++++++++++
> test/gh-4427-ffi-sandwich/CMakeLists.txt | 1 +
> test/gh-4427-ffi-sandwich/libsandwich.c | 59 ++++++++++++++++++++++++
> test/lj-flush-on-trace.skipcond | 7 +++
> test/lj-flush-on-trace.test.lua | 48 +++++++++++++++++++
> test/lj-flush-on-trace/CMakeLists.txt | 1 +
> test/lj-flush-on-trace/libflush.c | 31 +++++++++++++
> test/suite.ini | 1 +
> test/utils.lua | 33 +++++++++++++
> 13 files changed, 280 insertions(+), 9 deletions(-)
> create mode 100644 test/gh-4427-ffi-sandwich.skipcond
> create mode 100755 test/gh-4427-ffi-sandwich.test.lua
> create mode 100644 test/gh-4427-ffi-sandwich/CMakeLists.txt
> create mode 100644 test/gh-4427-ffi-sandwich/libsandwich.c
> create mode 100644 test/lj-flush-on-trace.skipcond
> create mode 100755 test/lj-flush-on-trace.test.lua
> create mode 100644 test/lj-flush-on-trace/CMakeLists.txt
> create mode 100644 test/lj-flush-on-trace/libflush.c
> create mode 100644 test/utils.lua
>
> --
> 2.25.0
>
--
Best regards,
IM
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