What does Syscall Parameter Address Restrictions change?

Tightens which memory addresses syscall parameters may reference.

SIMD-0459: Syscall Parameter Address Restrictions — Solana Activation Status

Syscall Parameter Address Restrictions is active on Solana mainnet since epoch 995 — activated 2 months ago.

mainnet: active since epoch 995 · 2 months ago
testnet: active since epoch 956 · 3 months ago
devnet: active since epoch 1070 · 3 months ago

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How we know

Solana ships protocol changes behind on-chain switches called feature gates. This page reads the switch itself about every minute — once an activation is requested, it completes at the next epoch boundary, which is where the countdown comes from. No announcements, no invented dates.