1 files changed, 33 insertions, 0 deletions
diff --git a/results/scraper/fex/3675 b/results/scraper/fex/3675
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+Sifu and RDR break FEX's SMC tracking logic
+Both Sifu and RDR break FEX's SMC tracking logic due to the ordering it does mprotects in. Nailed down where it is happening, now I just need to fix it.
+
+small unittest which reproduces without running the full game.
+```cpp
+#include <cstdint>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+int main() {
+
+  // Original:
+  // Base: 0x6ffffc0b8000
+  // PtrHigh: 0x6ffffc0be000 (+0x6000)
+  // PtrLow: 0x6ffffc0bd000 (+0x5000)
+  const uint64_t PtrBase = 0x10'0000;
+  const uint64_t PtrLow = PtrBase + 0x1000;
+  const uint64_t PtrLowSize = 0x2000;
+  const uint64_t PtrHigh = PtrBase + 0x2000;
+  const uint64_t PtrHighSize = 0x1000;
+  const uint64_t TotalSize = PtrHigh + 0x1000 - PtrBase;
+
+  (void)mmap((void*)PtrBase, TotalSize, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
+
+  // Order matters.
+  mprotect((void*)PtrHigh, PtrHighSize, PROT_READ);
+  mprotect((void*)PtrLow, PtrLowSize, PROT_READ);
+
+  ::syscall(SYS_exit_group, 0);
+  return 0;
+}
+```
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