From c302bbba4606ec3a9fca4649705052834901c183 Mon Sep 17 00:00:00 2001
From: tiancaiamao <tiancaiamao@gmail.com>
Date: Mon, 13 May 2019 22:04:00 +0800
Subject: [PATCH] planner/core,session: fix privilege check for update (8376)

---
 planner/core/logical_plan_builder.go |  2 +-
 session/session_test.go              | 26 +++++++++++++++++++++++++-
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/planner/core/logical_plan_builder.go b/planner/core/logical_plan_builder.go
index 02f0f4bded97e..7f7b02e4503f7 100644
--- a/planner/core/logical_plan_builder.go
+++ b/planner/core/logical_plan_builder.go
@@ -2149,7 +2149,7 @@ func (b *planBuilder) buildUpdate(update *ast.UpdateStmt) (Plan, error) {
 		if dbName == "" {
 			dbName = b.ctx.GetSessionVars().CurrentDB
 		}
-		b.visitInfo = appendVisitInfo(b.visitInfo, mysql.UpdatePriv, dbName, t.Name.L, "")
+		b.visitInfo = appendVisitInfo(b.visitInfo, mysql.SelectPriv, dbName, t.Name.L, "")
 	}
 
 	if sel.Where != nil {
diff --git a/session/session_test.go b/session/session_test.go
index 4c1744387a4b9..61a640b80fdd1 100644
--- a/session/session_test.go
+++ b/session/session_test.go
@@ -15,6 +15,7 @@ package session_test
 
 import (
 	"fmt"
+	"strings"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -2350,6 +2351,29 @@ func (s *testSessionSuite) TestSetGroupConcatMaxLen(c *C) {
 
 func (s *testSessionSuite) TestUpdatePrivilege(c *C) {
 	tk := testkit.NewTestKitWithInit(c, s.store)
+	tk.MustExec("drop table if exists t1, t2;")
+	tk.MustExec("create table t1 (id int);")
+	tk.MustExec("create table t2 (id int);")
+	tk.MustExec("insert into t1 values (1);")
+	tk.MustExec("insert into t2 values (2);")
+	tk.MustExec("create user xxx;")
+	tk.MustExec("grant all on test.t1 to xxx;")
+	tk.MustExec("grant select on test.t2 to xxx;")
+	tk.MustExec("flush privileges;")
+
+	tk1 := testkit.NewTestKitWithInit(c, s.store)
+	c.Assert(tk1.Se.Auth(&auth.UserIdentity{Username: "xxx", Hostname: "localhost"},
+		[]byte(""),
+		[]byte("")), IsTrue)
+
+	_, err := tk1.Exec("update t2 set id = 666 where id = 1;")
+	c.Assert(err, NotNil)
+	c.Assert(strings.Contains(err.Error(), "privilege check fail"), IsTrue)
+
+	// Cover a bug that t1 and t2 both require update privilege.
+	// In fact, the privlege check for t1 should be update, and for t2 should be select.
+	_, err = tk1.Exec("update t1,t2 set t1.id = t2.id;")
+	c.Assert(err, IsNil)
 
 	// Fix issue 8911
 	tk.MustExec("create database weperk")
@@ -2359,7 +2383,6 @@ func (s *testSessionSuite) TestUpdatePrivilege(c *C) {
 	tk.MustExec("grant all privileges on weperk.* to 'weperk'@'%'")
 	tk.MustExec("flush privileges;")
 
-	tk1 := testkit.NewTestKitWithInit(c, s.store)
 	c.Assert(tk1.Se.Auth(&auth.UserIdentity{Username: "weperk", Hostname: "%"},
 		[]byte(""), []byte("")), IsTrue)
 	tk1.MustExec("use weperk")
@@ -2387,6 +2410,7 @@ WHERE
 s.a = t.a
 and t.c >=  1 and t.c <= 10000
 and s.b !='xx';`)
+
 }
 
 func (s *testSessionSuite) TestTxnGoString(c *C) {