https://github.com/python/cpython/commit/099943b122cda2548ad7e9cb4b327706929af7d0
commit: 099943b122cda2548ad7e9cb4b327706929af7d0
branch: main
author: Stan Ulbrych <[email protected]>
committer: alex <[email protected]>
date: 2026-03-09T22:51:00Z
summary:
Vary compiler flags in `fuzz_pycompile` (#145236)
* Vary compiler flags in fuzz_pycompile
* Drop `PyCF_SOURCE_IS_UTF8`
files:
M Modules/_xxtestfuzz/fuzzer.c
diff --git a/Modules/_xxtestfuzz/fuzzer.c b/Modules/_xxtestfuzz/fuzzer.c
index 14da472c1bb110..f3a22f3f6a87cb 100644
--- a/Modules/_xxtestfuzz/fuzzer.c
+++ b/Modules/_xxtestfuzz/fuzzer.c
@@ -517,8 +517,8 @@ static int fuzz_pycompile(const char* data, size_t size) {
return 0;
}
- // Need 2 bytes for parameter selection
- if (size < 2) {
+ // Need 3 bytes for parameter selection
+ if (size < 3) {
return 0;
}
@@ -530,25 +530,39 @@ static int fuzz_pycompile(const char* data, size_t size) {
unsigned char optimize_idx = (unsigned char) data[1];
int optimize = optimize_vals[optimize_idx % NUM_OPTIMIZE_VALS];
+ // Use third byte to determine compiler flags to use.
+ unsigned char flags_byte = (unsigned char) data[2];
+ PyCompilerFlags flags = _PyCompilerFlags_INIT;
+ if (flags_byte & 0x01) {
+ flags.cf_flags |= PyCF_DONT_IMPLY_DEDENT;
+ }
+ if (flags_byte & 0x02) {
+ flags.cf_flags |= PyCF_ONLY_AST;
+ }
+ if (flags_byte & 0x04) {
+ flags.cf_flags |= PyCF_IGNORE_COOKIE;
+ }
+ if (flags_byte & 0x08) {
+ flags.cf_flags |= PyCF_TYPE_COMMENTS;
+ }
+ if (flags_byte & 0x10) {
+ flags.cf_flags |= PyCF_ALLOW_TOP_LEVEL_AWAIT;
+ }
+ if (flags_byte & 0x20) {
+ flags.cf_flags |= PyCF_ALLOW_INCOMPLETE_INPUT;
+ }
+ if (flags_byte & 0x40) {
+ flags.cf_flags |= PyCF_OPTIMIZED_AST;
+ }
+
char pycompile_scratch[MAX_PYCOMPILE_TEST_SIZE];
// Create a NUL-terminated C string from the remaining input
- memcpy(pycompile_scratch, data + 2, size - 2);
+ memcpy(pycompile_scratch, data + 3, size - 3);
// Put a NUL terminator just after the copied data. (Space was reserved
already.)
- pycompile_scratch[size - 2] = '\0';
-
- // XXX: instead of always using NULL for the `flags` value to
- // `Py_CompileStringExFlags`, there are many flags that conditionally
- // change parser behavior:
- //
- // #define PyCF_TYPE_COMMENTS 0x1000
- // #define PyCF_ALLOW_TOP_LEVEL_AWAIT 0x2000
- // #define PyCF_ONLY_AST 0x0400
- //
- // It would be good to test various combinations of these, too.
- PyCompilerFlags *flags = NULL;
-
- PyObject *result = Py_CompileStringExFlags(pycompile_scratch, "<fuzz
input>", start, flags, optimize);
+ pycompile_scratch[size - 3] = '\0';
+
+ PyObject *result = Py_CompileStringExFlags(pycompile_scratch, "<fuzz
input>", start, &flags, optimize);
if (result == NULL) {
/* Compilation failed, most likely from a syntax error. If it was a
SystemError we abort. There's no non-bug reason to raise a
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