Safe-Linking is a security mechanism introduced in modern versions of Glibc (≥ 2.32) to protect heap metadata — especially the forward pointers (FD) stored in tcache and fast bins.
Traditionally, these pointers could be directly overwritten by attackers to perform heap exploitation (like tcache poisoning).
Safe-Linking prevents this by obfuscating pointers using an XOR operation with bits from the chunk’s own address.
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