42 lines
2.2 KiB
Swift
42 lines
2.2 KiB
Swift
// kern.decmpfs · XNU · AppleFSCompressionTypeZlib · CVE-2026-113910
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// 原语: 信息泄露 · 内核 · tier 2
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// Primitive: info leak · kernel · tier 2
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//
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// [zh] decmpfs 分块解压欠产出 → 内核堆泄露
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// 分块 zlib 解压的实际产出少于预期时，27.0 不比对 produced 与 expected，内核页缓冲的尾部因此保持未写状态；read() 随后将整个缓冲交回应用，使应用取得陈旧的堆内容。
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// 27.2 补入该比对。
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//
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// [en] decmpfs chunked decompression under-produce → kernel heap disclosure
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// When chunked zlib decompression produces fewer bytes than expected, 27.0 does not compare produced
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// against expected, so the tail of the kernel page buffer is left unwritten; read() then hands the
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// whole buffer back to the app, which receives stale heap content. iOS 27.2 adds that comparison.
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// ── 判别 / oracle ──
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// 这是整套原语中少数完全不需要 entitlement 的内核路径：应用在自身容器内写入一个带 com.apple.decmpfs 扩展属性的文件，读回的内容即内核解压的产物。以 8 字节窗口扫描，
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// 凡落在内核地址空间范围（≥ 0xFFFFFFE000000000）的值即为候选指针。
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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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