pingcap/tidb

set session level `sql_require_primary_key` didn't check privilege

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#61,825 opened on Jun 19, 2025

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good first issueseverity/moderatesig/sql-infratype/bug

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Description

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

mysql> CREATE USER 'test'@'%' IDENTIFIED BY '';
Query OK, 0 rows affected (0.027 sec)

$ mysql -u test -h 127.0.0.1 -P 4000
...
mysql> set sql_require_primary_key = 0;
Query OK, 0 rows affected (0.000 sec)

mysql> set global sql_require_primary_key = 0;
ERROR 1227 (42000): Access denied; you need (at least one of) the SUPER or SYSTEM_VARIABLES_ADMIN privilege(s) for this operation

2. What did you expect to see? (Required)

both session and global level should fail. https://dev.mysql.com/doc/refman/8.4/en/server-system-variables.html#sysvar_sql_require_primary_key

3. What did you see instead (Required)

session level has no error

4. What is your TiDB version? (Required)

at least v8.5.2

Contributor guide

Research direction
Investigate the session level setter for `sql require primary key` in TiDB's codebase. Compare with the global setter that correctly denies the operation. Look in `sessionctx/variable` or `privilege` packages for privilege check functions. The fix likely involves adding a privilege check call in the session setter path.
Tech stack
gomysql
Domain
databasesecurity
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
basic Gofamiliarity with TiDB privilege system
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65