tarantool / luajit / 13012199875

93%

Build Type

push

github

Committed by Buristan

Commit Message

Fix command-line argv handling.

(cherry-picked from commit 9ebebc9b5)

Before the patch, there was a situation where `luaL_newstate()` could
fail in `main()` and the `argv[0]` could be used as a progname in
`l_message()`. However, `argv[0]` is not guaranteed to be non-NULL, so
the segmentation fault could occur. This patch fixes the issue by using
the predefined name in that case. Moreover, it refactors the
`l_message()`, so now there is no need to pass the program name
everywhere.

The patch is tested with the help of the mocking of `luaL_newstate` by
providing an error-injected implementation of it and preloading it. For
preload to work, the LuaJIT must be built with dynamic build mode
enabled. The corresponding flavor is added to the CI only for x86_64
Debug build to avoid CI jobs outgrowing.

The <gh-8594-sysprof-ffunc-crash.test.c> inspects internal symbols from
the LuaJIT static library, so it can't be linked for shared build. The
test is disabled for the dynamic build mode.

Since the Linux kernel 5.18-rc1 release, `argv` is forced to a single
empty string if it is empty [1], so the issue is not reproducible on new
kernels. You may inspect the `dmesg` log for the corresponding warning
entrance.

Maxim Kokryashkin:
* added the description and the test for the problem

[1]: https://lore.kernel.org/all/20220201000947.2453721-1-keescook@chromium.org/

Part of tarantool/tarantool#10709

Reviewed-by: Sergey Kaplun <skaplun@tarantool.org>
Reviewed-by: Sergey Bronnikov <sergeyb@tarantool.org>
Signed-off-by: Sergey Kaplun <skaplun@tarantool.org>

Run Details

5696 of 6033 branches covered (94.41%)

Branch coverage included in aggregate %.

7 of 10 new or added lines in 1 file covered. (70.0%)

1 existing line in 1 file now uncovered.

21703 of 23438 relevant lines covered (92.6%)

2965300.81 hits per line