42 lines
2.2 KiB
Swift
42 lines
2.2 KiB
Swift
// aud.lc3 · AudioCodecs · ACLC3Decoder::AppendInputData · CVE-2026-112638
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// 原语: OOB 写 · 权限受限 · tier 2
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// Primitive: OOB write · entitlement-gated · tier 2
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//
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// [zh] LC3 解码器输入缓冲溢出
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// memcpy 仅以 mDataByteSize 作为长度，完全不参考输入 vector 的 (begin, end) 容量。27.2 增加 capacity < size 时的拒绝分支。LC3
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// 是蓝牙 LE Audio 的编解码器，其实例化受 com.apple.coreaudio.allow-lc3-codec 授权约束，故崩溃发生在系统音频进程内 —— 与公告所称「系统终止」一致。
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//
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// [en] LC3 decoder input buffer overflow
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// memcpy uses mDataByteSize as its length and never consults the (begin, end) capacity of the input
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// vector. iOS 27.2 adds a capacity < size rejection. LC3 is the Bluetooth LE Audio codec and its
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// instantiation is gated by com.apple.coreaudio.allow-lc3-codec, so the crash lands in the system
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// audio process — matching the advisory's "system termination".
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// ── 判别 / oracle ──
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// 这个模块先检查进程是否持有该 entitlement，再尝试构造 LC3 AudioConverter 看内核/框架在哪一层拒绝。无授权时它一定失败，但失败点本身就是有用信息。
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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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