主题： sip

• System Integrity Protection and the Signed System Volume: what they protect, and why not to disable them

  SIP restricts even root from modifying protected system paths or protected processes; the Signed System Volume cryptographically seals the entire system volume and checks it at every boot. Together they explain why /usr/local is writable but /usr is not, and why disabling SIP is not a legitimate fix for a permissions error.

  article · en · reviewed · 知识截至 2026-09-24

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