Ensure Appropriate Core Dump Limits Are Set

LowLevel 2Manual reviewtdsql

Description

Core dumps of TDSQL processes may contain sensitive data (encryption keys, passwords, query data). Core dump generation should be restricted in production. Note: TDSQL's start.sh sets ulimit -c unlimited by default.

How it is checked

Audit method: Manual review

This recommendation cannot be checked automatically. A scan lists it with these instructions when you pass --include-manual.

Run ulimit -c for the TDSQL service account, cat /proc/sys/kernel/core_pattern and grep -r 'ulimit.*-c' <tdsql>/bin/start.sh (TDSQL start.sh sets unlimited). Core dumps must either be disabled or written only to a restricted directory (e.g. /var/core/tdsql, mode 700, owned by tdsql) with a size limit set by policy.

How it is fixed

Fix method: Guidance or infrastructure patch

# Create a restricted core dump directory mkdir -p /var/core/tdsql chmod 700 /var/core/tdsql chown tdsql:tdsql /var/core/tdsql echo 'kernel.core_pattern = /var/core/tdsql/core.%e.%p.%t' >> /etc/sysctl.conf sysctl -p # Modify start.sh for production: # From: ulimit -c unlimited # To: ulimit -c 0 (or a reasonable limit)

Properties

Operating systems: Any
Tags: tdsqlos
Reference: CIS Tencent TDSQL 10.3.22 Benchmark v1.0.0 - 1.7 Ensure Appropriate Core Dump Limits Are Set