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Merged
merged 3 commits into from
Sep 17, 2025
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Repo sync for protected branch #5782

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4171a71
Note that the state of ASan shadow bytes is 'addressable' (#6084)
davidmrdavid Sep 16, 2025
5746bf8
Merge pull request #6085 from MicrosoftDocs/main
learn-build-service-prod[bot] Sep 17, 2025
0225585
Merging changes synced from https://github.com/MicrosoftDocs/cpp-docs…
Sep 17, 2025
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3 changes: 3 additions & 0 deletions docs/sanitizers/asan-shadow-bytes.md
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Expand Up @@ -19,6 +19,9 @@ One shadow byte describes how many bytes are currently accessible as follows:
- 1-7 means one to seven bytes
- Negative numbers encode context for the runtime to use for reporting diagnostics.

> [!NOTE]
> By default, entries in the shadow memory are zero-initialized. Therefore, ASan assumes that the memory is _addressable_ by default, i.e. valid to read and write. The shadow bytes will be populated with non-zero values as the program executes and the lifetime of variables and other allocations come to an end.

### Shadow byte legend

Consider this shadow byte legend where all negative numbers are defined:
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