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auditcmd: rate-limit burst tracking has no locking, letting concurrent calls race and undercount

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
76/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Active
Tech stack
go
Domain
backend, security

Research direction

Start at guard/auditcmd/ratelimit_observe.go:33 and trace how concurrent calls update the burst and observation counters. Run the relevant Go tests with -race, then check that concurrent updates are synchronized and the final count matches the number of calls.

Written by the indexing model from the issue text.

Description

bug

Problem

In packages/guard/auditcmd/ratelimit_observe.go:33, the read-modify-write sequence that updates burst/observation counters is not protected by any mutex or atomic operation, despite being reachable from concurrent goroutines handling simultaneous requests.

Impact

Concurrent calls can race on the same counter: two goroutines can both read the same pre-update value and each write back an increment based on it, losing one of the two updates. Under load this causes the rate-limit observation counts to undercount actual activity, which can let bursts that should have been flagged slip through analysis or alerting.

Repro

  1. Drive many concurrent calls into the code path that updates the observation counter (e.g. with go test -race exercising it from multiple goroutines, or a load test hitting the same action concurrently).
  2. Compare the final counter value to the known number of calls made; observe it undercounts when run under -race or high concurrency, and go test -race flags the unsynchronized access.

Suggested fix

Protect the counter's read-modify-write with a sync.Mutex (or switch the counter to atomic.Int64/atomic.AddInt64) so concurrent updates cannot interleave and lose increments.

Dominant language
Go
Stars
157
Forks
19
Avg merge
4h 32m
Merged PRs (30d)
96

Getting set up

First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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