The Py_BuildValue format string specification being used in pyeventlog.c, "y#" expands to a char * and a Py_ssize_t parameter. The values passed in at the corresponding va_arg positions are char* and int32_t, respectively.
On Intel Macs, int32_t is not aligned to the same 64-bit boundary as Py_ssize_t, making this an invalid cast.
The symptom is a MemoryError which occurs when trying to read_next_event()
The
Py_BuildValueformat string specification being used inpyeventlog.c,"y#"expands to achar *and aPy_ssize_tparameter. The values passed in at the corresponding va_arg positions arechar*andint32_t, respectively.On Intel Macs,
int32_tis not aligned to the same 64-bit boundary asPy_ssize_t, making this an invalid cast.The symptom is a
MemoryErrorwhich occurs when trying toread_next_event()The problem has been demonstrated by @ihilt with a CI pipeline based on this commit.
This PR widens the
channellenanddatalenbefore passing them intoPy_BuildValue.