tests: introduce ffi_cdef_proto_test #105
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
LuaJIT has a FFI library which allows calling external C functions and using C data structures from a pure Lua code, see [1]. According to a FFI API documentation [2] the Lua function `ffi.cdef(def)` adds multiple C declarations for types or external symbols (named variables or functions). `def` must be a Lua string. The contents of the string `def` must be a sequence of C declarations, separated by semicolons. The C parser complies to the C99 language standard plus the extensions described in [3]. Note, LuaJIT C parser is not a validating C parser. It expects and accepts correctly formed C declarations. Therefore without grammar-aware fuzzing we will face with a false-positive crashes. The patch adds a grammar-aware test, where C declarations generated automatically using Protobuf grammar and LibProtoBuf-mutator and then serialize Protobuf structure to a string. Note, an implementation is not finished yet. An example of bug in `src/lj_cparse.c` is LJ#1114. 1. https://luajit.org/ext_ffi.html 2. https://luajit.org/ext_ffi_api.html 3. https://luajit.org/ext_ffi_semantics.html#clang 4. https://luajit.org/ext_ffi_semantics.html#status
ligurio
force-pushed
the
ligurio/introduce-ffi_cdef-test
branch
from
ac31c8c to
e4f8214
Compare
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
LuaJIT has a FFI library which allows calling external C functions and using C data structures from a pure Lua code, see [1].
According to a FFI API documentation [2] the Lua function
ffi.cdef(def)adds multiple C declarations for types or external symbols (named variables or functions).defmust be a Lua string. The contents of the stringdefmust be a sequence of C declarations, separated by semicolons. The C parser complies to the C99 language standard plus the extensions described in [3].Note, LuaJIT C parser is not a validating C parser. It expects and accepts correctly formed C declarations. Therefore without grammar-aware fuzzing we will face with a false-positive crashes.
The patch adds a grammar-aware test, where C declarations generated automatically using Protobuf grammar and LibProtoBuf-mutator and then serialize Protobuf structure to a string.
An example of bug in
src/lj_cparse.cis LJ#1114.