maxminddb's `Reader::open_mmap` unsoundly marks unsafe memmap operation as safe

maxminddb prior to version 0.27 declared Reader::openmmap as safe despite wrapping an inherently unsafe memmap2 operation with no extra step done to guarantee safety. This could have led to undefined behaviour if the file were to be modified on disk while the memory map was still active...

GHSA-MJ73-J457-8X9Q maxminddb's `Reader::open_mmap` unsoundly marks unsafe memmap operation as safe

maxminddb prior to version 0.27 declared Reader::openmmap as safe despite wrapping an inherently unsafe memmap2 operation with no extra step done to guarantee safety. This could have led to undefined behaviour if the file were to be modified on disk while the memory map was still active...

RUSTSEC-2025-0132 `Reader::open_mmap` unsoundly marks unsafe memmap operation as safe

maxminddb prior to version 0.27 declared Reader::openmmap as safe despite wrapping an inherently unsafe memmap2 operation with no extra step done to guarantee safety. This could have led to undefined behaviour if the file were to be modified on disk while the memory map was still active...