Commits on Sep 17, 2024

1. pagekitec: add patch to fix use after free …

   Observation:
   - programs using libpagekitec did crash with SIGSEGV on startup on RPi3,4
     while having worked fine for years on RPi1+2
   
   Explantation:
   - the final "judgement" test were done on pointers into the `copy` buffer
     freed on line 766 instead of on the safe copies of those strings in `kite`
     and `kite_r`.
   - this opened a very short race condition window, however the crash was
     caught happening while a tight loop (`pkb_start_blockers`) fired up 16
     of those threads in rapid succession.
     So probably if the next thread got to allocate memory before the
     "judgements" tests, accessing the just freed `copy` would cause a segfault.
   
   Fix:
   - check the safe copies of the strings instead of pointers into freed `copy`.
   
   Signed-off-by: Lukas Zeller <[email protected]>

   

   plan44 committed Sep 17, 2024
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