net_mana: Added validation for ContiguousBufferMemory construction#2944
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ben-zen merged 6 commits intomicrosoft:mainfrom Mar 20, 2026
Merged
net_mana: Added validation for ContiguousBufferMemory construction#2944ben-zen merged 6 commits intomicrosoft:mainfrom
ben-zen merged 6 commits intomicrosoft:mainfrom
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Pull request overview
Adds input validation to ContiguousBufferManager construction to ensure ring-buffer indexing remains correct across u32 wrap-around, and introduces a unit test to enforce the allowed page_limit values.
Changes:
- Add a constructor-time validation for
page_limitto prevent invalid ring sizing. - Add a unit test that checks only power-of-two page counts are accepted.
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…icrosoft#2944) ContiguousBufferMemory works by having a rolling `len`-sized window of valid offsets across all `u32` values. The only safe window sizes are therefore powers of 2, otherwise you can potentially have multiple buffers assigned the same offset near the end of the `u32` space, due to how modular arithmetic rolls over values. --------- Co-authored-by: Ben Lewis <Ben.Lewis@microsoft.com>
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ContiguousBufferMemory works by having a rolling
len-sized window of valid offsets across allu32values. The only safe window sizes are therefore powers of 2, otherwise you can potentially have multiple buffers assigned the same offset near the end of theu32space, due to how modular arithmetic rolls over values.