LoadZIMPtr() writes width[]/height[]/image[] as arrays (one entry per
mip level, up to ZIM_MAX_MIP_LEVELS) whenever the file has
ZIM_HAS_MIPS set, per its documented contract - but this caller passed
plain scalar locals. A texture-replacement .zim file with that flag
set caused multiple out-of-bounds stack writes. Now passes properly
sized arrays and only uses level 0, matching the existing "we don't
support ZIM mips yet" behavior. Also fixes a pre-existing leak of
image[0] on the "changed since header read" error path.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L4QAoxV2KY7ek4PcZw3WvY
Add unittest/TestTextureReplacer which creates a fictive texture pack
(textures.ini with readable invented hashes plus real PNG files), loads
it via the replacer, and verifies lookups, filtering, hashranges, mip
levels, and missing/ignored entries.
To make the replacer runnable outside the emulator:
- The constructor now accepts a null DrawContext (formats just default
to unsupported).
- FindReplacement/FindFiltering use the replaceEnabled_ member instead
of the global config.
- Added TextureReplacer::LoadPackForTesting() to load an ini from a
path directly.
Vuln 17: ReplacedTexture::LoadLevelData let a KTX2/DDS file at a higher
mip level resize the shared data_ vector to its own (attacker-controlled)
mip count, so data_[mipLevel + i] indexed out of bounds and the KTX2
branch resized a different element than it wrote to. Disallow mixing
image formats across mip levels, cap the container mip count, and resize
the same element that is used as the transcode destination.
Vuln 18: DecodeTextureLevel only validated the start address for
non-DXT textures, so guest-controlled w/h/bufw could drive reads past
mapped RAM. Validate the needed range like the DXT path does and clamp
the height; ReadIndexedTex now takes the clamped w/h.
Texture pack filenames/aliases from textures.ini were used to build read
and write paths with no '..' check, letting a malicious pack read or
write files outside the pack directory.
- LoadIniValues rejects entries with a parent dir component via
HasParentDirComponent.
- ReplacedTexture::Prepare skips such filenames as defense in depth.
- PSPLoaders savestate migration now uses the shared HasPathTraversal
helper instead of inline separator checks.
Henrik Rydgård