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Out of bounds heap read in shred / coreutils

The GNU Coreutils project has just released the new version 8.25 which fixes an out of bounds heap read bug in the shred tool that I reported. It is a nice example of the subtle bugs one can find by testing code with address sanitizer.

shred is a tool to overwrite files with random data before deleting them. It generates a random memory pattern and in this pattern generation there was a heap overread. Due to the random pattern generation this bug is not deterministic and one has to run shred with certain parameters (for example -n 20) multiple times to trigger it.

Upstream bug report
Git commit / fix
Coreutils 8.25 release notes


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