ingester: fix ingestion delay histogram reset duration - #7772
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August 16, 2026 03:34
trimStringByBytes scans backwards from the truncation point to find a
UTF-8 rune start, but the loop had no lower bound. When a request field
consists only of UTF-8 continuation bytes (0x80-0xBF) there is no rune
start to land on, so size underflows past zero and bytesStr[-1] panics
with 'index out of range [-1]'. Because the active query tracker is
enabled by default and the panic happens on a goroutine without recover(),
an attacker-supplied match[]/query value can crash the querier.
Bound the scan with 'size > 0' so it stops at the start of the string
instead of underflowing. When no rune start exists the field is truncated
to an empty string, which is safe.
Add TestTrimForJsonMarshalContinuationBytes covering the all-continuation-
byte case; existing multi-byte tests use valid UTF-8 ('世') which always
terminates the scan at index 0 and therefore never exercised the underflow.
Fixes cortexproject#7729
Signed-off-by: ...
Signed-off-by: Mehrdad Biukian Naeini <mehrdad.biu@mtnirancell.ir>
…roject#7731) Signed-off-by: Mehrdad Biukian Naeini <mehrdad.biu@mtnirancell.ir>
…#7731) Signed-off-by: Mehrdad Biukian Naeini <mehrdad.biu@mtnirancell.ir>
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Summary
Fixes #7731.
cortex_ingester_ingestion_delay_secondswas registered withNativeHistogramMinResetDuration: 1. The field is atime.Duration, so the bare integer1is interpreted as 1 nanosecond, which resets the native histogram on essentially every scrape and discards ~86% of observations.This change sets it to
1 * time.Hour(consistent with the siblingminResetDurationon the adjacent histogram) and extracts the histogram options into a package-levelingestionDelaySecondsHistogramOptsso the reset duration is directly testable.Test plan
TestIngestionDelaySecondsHistogramResetDurationassertingNativeHistogramMinResetDuration == time.Hour.1literal and passes (GREEN) with1 * time.Hour.Checklist
Signed-off-by: mehrdadbn9 mehrdadbn9@users.noreply.github.com