tree 8c439d2f8854a45fa13f3ba5eccb23f6894087ea
parent 61bd8664065ebe0ecd9162cd7e8691d679257e78
author Matt Morehouse <mascasa@google.com> 1598457972 -0700
committer Copybara-Service <copybara-worker@google.com> 1616739678 -0700

[libFuzzer] Error and exit if user supplied fuzzer writeable directories don't exist

Currently, libFuzzer will exit with an error message if a non-existent
corpus directory is provided. However, if a user provides a non-existent
directory for the `artifact_prefix`, `exact_artifact_path`, or
`features_dir`, libFuzzer will continue execution but silently fail to
write artifacts/features.

To improve the user experience, this PR adds validation for the existence of
all user supplied directories before executing the main fuzzing loop. If they
don't exist, libFuzzer will exit with an error message.

Patch By: dgg5503

Reviewed By: morehouse

Differential Revision: https://reviews.llvm.org/D84808

GitOrigin-RevId: 2392ff093af128d5e46ce31e2ffa0b3e17185e32