On 3/2/2021 10:38 AM, Daniel P. Berrangé wrote:
Is this scenario going to upset CFI, or is it happy that 'void *' is compatible with 'mytype *', and ok with the intermediate casts to/from GCallback ?
This is a valid scenario. LLVM does offer the ability of considering all pointer types compatible, and it is being enabled in QEMU. So void* is compatible to any type* and that would not be considered a fault.
Intermediate casts are also fine since you are just passing the pointer but not using it. The check will happen only when the function is called, at which point it was cast back to something compatible.
