42 lines
2.0 KiB
Swift
42 lines
2.0 KiB
Swift
// aud.drc · AudioCodecs · mpddrc::UniDrcSelection · CVE-2026-113912 / 86972
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// 原语: OOB 读 · 系统进程 · tier 2
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// Primitive: OOB read · system process · tier 2
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//
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// [zh] MPEG-D DRC 下混矩阵系数校验
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// selectDownmixMatrix 在 27.0 仅有零值与相等性检查；矩阵维度直接取自 DRC 元数据，不与系数数组的实际长度比较。27.2 补入三道闸门：nChannels ≤ 8、维度有序、系数数
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// == 行×列，并为 getSignalPeakLevel 与 Process 增加计数校验。
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//
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// [en] MPEG-D DRC downmix matrix coefficient validation
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// On 27.0 selectDownmixMatrix has only zero and equality checks; the matrix dimensions come straight
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// from DRC metadata and are never compared against the coefficient array's real length. iOS 27.2
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// adds three gates — nChannels ≤ 8, ordered dimensions, coefficient count == rows×cols — plus count
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// checks in getSignalPeakLevel and Process.
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// ── 判别 / oracle ──
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// 需要 MPEG-D DRC 元数据的音频文件。应用侧探 AudioCodecs 是否导出这些符号。
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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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