41 lines
1.9 KiB
Swift
41 lines
1.9 KiB
Swift
// sbx.toctou · libsystem_sandbox · sandbox_extension_issue_file ·
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// 原语: OOB 读 · 进程内 · tier 1
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// Primitive: OOB read · in-process · tier 1
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//
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// [zh] sandbox_extension 符号链接 TOCTOU 越界读
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//
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// [en] sandbox_extension symlink TOCTOU out-of-bounds read
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// sandbox_extension_issue_file resolves a symlink at issue time but does not enforce SANDBOX_EXTENSION_NOFOLLOW.
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// The token it returns is therefore bound to the target resolved at issue time, and the kernel does
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// not re-verify that the path used at consume time is the path the token was issued for. The sequence:
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// create symlink L inside the sandbox pointing at in-sandbox file S; issue an extension for L (the
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// kernel records S); repoint L at out-of-sandbox target T; consume the token and read through L.
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// The kernel permits S's class while the path actually opened is T's.
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// ── 判别 / oracle ──
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import Foundation
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// ── byte helpers — verbatim from Cinder27 Sources/Kit.swift ──
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enum B {
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static func be16(_ v: UInt16) -> [UInt8] { [UInt8(v >> 8 & 0xff), UInt8(v & 0xff)] }
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static func le16(_ v: UInt16) -> [UInt8] { [UInt8(v & 0xff), UInt8(v >> 8 & 0xff)] }
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static func be32(_ v: UInt32) -> [UInt8] {
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[UInt8(v >> 24 & 0xff), UInt8(v >> 16 & 0xff), UInt8(v >> 8 & 0xff), UInt8(v & 0xff)]
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}
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static func le32(_ v: UInt32) -> [UInt8] {
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[UInt8(v & 0xff), UInt8(v >> 8 & 0xff), UInt8(v >> 16 & 0xff), UInt8(v >> 24 & 0xff)]
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}
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static func be64(_ v: UInt64) -> [UInt8] {
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(0..<8).map { UInt8((v >> (56 - UInt64($0) * 8)) & 0xff) }
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}
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static func le64(_ v: UInt64) -> [UInt8] {
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(0..<8).map { UInt8((v >> (UInt64($0) * 8)) & 0xff) }
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}
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static func both16(_ v: UInt16) -> [UInt8] { le16(v) + be16(v) }
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static func both32(_ v: UInt32) -> [UInt8] { le32(v) + be32(v) }
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static func ascii(_ s: String) -> [UInt8] { Array(s.utf8) }
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}
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