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ICU-23155 Fix buffer overflow in SSearchTest::offsetTest() #3546

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@gvictor gvictor commented Jul 3, 2025

https://unicode-org.atlassian.net/browse/ICU-23155

Use std::string instead.

Root cause analysis:
In printOffsets, while the pointer s is advanced, the remaining size n remains unchanged to be a constant 4096, and snprintf falsely thinks the buffer has 4096 bytes left.

Checklist

  • Required: Issue filed: ICU-23155
  • Required: The PR title must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
  • Required: Each commit message must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
  • Issue accepted (done by Technical Committee after discussion)
  • Tests included, if applicable
  • API docs and/or User Guide docs changed or added, if applicable

https://unicode-org.atlassian.net/browse/ICU-23155

Use std::string instead.

Root cause analysis:
In printOffsets, while the pointer `s` is advanced, the remaining
size `n` remains unchanged to be a constant 4096, and snprintf
falsely thinks the buffer has 4096 bytes left.
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@gvictor gvictor changed the title ICU-23155: Fix buffer overflow in SSearchTest::offsetTest() ICU-23155 Fix buffer overflow in SSearchTest::offsetTest() Jul 3, 2025
@gvictor gvictor requested a review from markusicu July 3, 2025 14:22
@markusicu markusicu self-assigned this Jul 10, 2025
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