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Henrik RydgårdandClaude Opus 5
917cb1b0fc
KL4E is Sony's second compression scheme for ~PSP modules, alongside gzip: LZ77 tokens where every bit is arithmetic-coded, structurally close to LZMA. PPSSPP could detect it but not decode it, so any module packed with it failed to load at all - the loader reached the gzip path and bailed there. Which scheme a compressed module uses is now decided by the payload's own magic rather than assuming gzip. On a 6.61 flash0 dump this takes the kd/ modules that load from 126 to 129 of 129; libmp3.prx, libaac.prx and libmp4.prx were the ones affected, and libmp3.prx decompresses to exactly the elf_size its PRX header declares. Two bounds problems in the format are fixed rather than reproduced: the match copy is unchecked against the output buffer on real hardware, so a crafted stream can write up to 255 bytes past it, and a long enough distance code indexes copyDistProbs out of range. Input reads are bounded too - the format carries no length and trusts the stream to terminate itself. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>