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CVE-2023-25193: [layout] Limit how far we skip when looking back · harfbuzz/harfbuzz@85be877
hb-ot-layout-gsubgpos.hh in HarfBuzz through 6.0.0 allows attackers to trigger O(n^2) growth via consecutive marks during the process of looking back for base glyphs when attaching marks.
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What do you do to prevent the same base glyph to be drawn more than once? Like if antialiasing is enabled, it will show differently?
Depending on how the font is designed, they will either stack on top of each other, or overdrawn.
What if a different base glyph is after the limit, what will be drawn then? Will it not show those base glyphs then? What are the implications of that?
Again, depending on how the font is designed, they might appear to the left of the cluster as a new cluster, or overdrawn on the cluster, or any other wrong rendering.
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