fix: catch KGSL GEM_CLOSE at ioctl instead of exporting drmIoctl (#305)

* fix: avoid reusing retired KGSL GEM handles

* fix: defer closing GEM_CLOSE'd KGSL dma-buf descriptors

* Revert "fix: defer closing GEM_CLOSE'd KGSL dma-buf descriptors"

This reverts commit 191bf4b6f2.

* test: interpose drmIoctl without releasing GEM_CLOSE handles

* fix: catch KGSL GEM_CLOSE at ioctl instead of exporting drmIoctl

.github/workflows/build.yml

@@ -363,9 +363,13 @@ jobs:
             echo "::error::libfakeinput.so exports the C++ runtime"; exit 1
           fi
           SESSION=$(syms "$D/libblsession.so")
-          for sym in socket bind getsockname setsockopt statfs statvfs syscall shm_open shm_unlink mmap mmap64 munmap drmPrimeFDToHandle drmCloseBufferHandle drmIoctl; do
+          for sym in socket bind getsockname setsockopt statfs statvfs syscall shm_open shm_unlink mmap mmap64 munmap drmPrimeFDToHandle drmCloseBufferHandle; do
             grep -qx "$sym" <<<"$SESSION" || { echo "::error::libblsession.so does not export $sym"; exit 1; }
           done
+          # Zink's GEM_CLOSE is caught at ioctl(); an exported drmIoctl made NMS replay old frames.
+          if grep -qx drmIoctl <<<"$SESSION"; then
+            echo "::error::libblsession.so exports drmIoctl"; exit 1
+          fi
           SSBS=$(syms "$D/libssbs.so")
           for sym in sigaction signal bsd_signal sysv_signal; do
             grep -qx "$sym" <<<"$SSBS" || { echo "::error::libssbs.so does not export $sym"; exit 1; }