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From 3d863b5e4efb2305d64f87a2128289d1c3ce09b6 Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Thu, 14 May 2020 21:16:52 +0000
Subject: [PATCH] Do not allow a virtual table to be renamed into the name of
one of its shadows.
FossilOrigin-Name: eca0ba2cf4c0fdf757bae19c6397a48245adb99e8017ddc28f01804072a30b2c
Upstream-Status: Backport
CVE: CVE-2020-13631
Reference to upstream patch:
https://github.com/sqlite/sqlite/commit/3d863b5e4efb2305d64f87a2128289d1c3ce09b6
Patch converted to amalgamation format
Signed-off-by: Steve Sakoman <steve@sakoman.com>
---
sqlite3.c | 39 ++++++++++++++++++++++++++++++---------
1 file changed, 30 insertions(+), 9 deletions(-)
diff --git a/sqlite3.c b/sqlite3.c
index e72fabb..282e106 100644
--- a/sqlite3.c
+++ b/sqlite3.c
@@ -19948,8 +19948,10 @@ SQLITE_PRIVATE Module *sqlite3VtabCreateModule(
SQLITE_PRIVATE int sqlite3ReadOnlyShadowTables(sqlite3 *db);
#ifndef SQLITE_OMIT_VIRTUALTABLE
SQLITE_PRIVATE int sqlite3ShadowTableName(sqlite3 *db, const char *zName);
+SQLITE_PRIVATE int sqlite3IsShadowTableOf(sqlite3*,Table*,const char*);
#else
# define sqlite3ShadowTableName(A,B) 0
+# define sqlite3IsShadowTableOf(A,B,C) 0
#endif
SQLITE_PRIVATE int sqlite3VtabEponymousTableInit(Parse*,Module*);
SQLITE_PRIVATE void sqlite3VtabEponymousTableClear(sqlite3*,Module*);
@@ -104793,7 +104795,10 @@ SQLITE_PRIVATE void sqlite3AlterRenameTable(
/* Check that a table or index named 'zName' does not already exist
** in database iDb. If so, this is an error.
*/
- if( sqlite3FindTable(db, zName, zDb) || sqlite3FindIndex(db, zName, zDb) ){
+ if( sqlite3FindTable(db, zName, zDb)
+ || sqlite3FindIndex(db, zName, zDb)
+ || sqlite3IsShadowTableOf(db, pTab, zName)
+ ){
sqlite3ErrorMsg(pParse,
"there is already another table or index with this name: %s", zName);
goto exit_rename_table;
@@ -111303,6 +111308,28 @@ static void convertToWithoutRowidTable(Parse *pParse, Table *pTab){
recomputeColumnsNotIndexed(pPk);
}
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+/*
+** Return true if pTab is a virtual table and zName is a shadow table name
+** for that virtual table.
+*/
+SQLITE_PRIVATE int sqlite3IsShadowTableOf(sqlite3 *db, Table *pTab, const char *zName){
+ int nName; /* Length of zName */
+ Module *pMod; /* Module for the virtual table */
+
+ if( !IsVirtual(pTab) ) return 0;
+ nName = sqlite3Strlen30(pTab->zName);
+ if( sqlite3_strnicmp(zName, pTab->zName, nName)!=0 ) return 0;
+ if( zName[nName]!='_' ) return 0;
+ pMod = (Module*)sqlite3HashFind(&db->aModule, pTab->azModuleArg[0]);
+ if( pMod==0 ) return 0;
+ if( pMod->pModule->iVersion<3 ) return 0;
+ if( pMod->pModule->xShadowName==0 ) return 0;
+ return pMod->pModule->xShadowName(zName+nName+1);
+}
+#endif /* ifndef SQLITE_OMIT_VIRTUALTABLE */
+
#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Return true if zName is a shadow table name in the current database
@@ -111314,8 +111341,6 @@ static void convertToWithoutRowidTable(Parse *pParse, Table *pTab){
SQLITE_PRIVATE int sqlite3ShadowTableName(sqlite3 *db, const char *zName){
char *zTail; /* Pointer to the last "_" in zName */
Table *pTab; /* Table that zName is a shadow of */
- Module *pMod; /* Module for the virtual table */
-
zTail = strrchr(zName, '_');
if( zTail==0 ) return 0;
*zTail = 0;
@@ -111323,11 +111348,7 @@ SQLITE_PRIVATE int sqlite3ShadowTableName(sqlite3 *db, const char *zName){
*zTail = '_';
if( pTab==0 ) return 0;
if( !IsVirtual(pTab) ) return 0;
- pMod = (Module*)sqlite3HashFind(&db->aModule, pTab->azModuleArg[0]);
- if( pMod==0 ) return 0;
- if( pMod->pModule->iVersion<3 ) return 0;
- if( pMod->pModule->xShadowName==0 ) return 0;
- return pMod->pModule->xShadowName(zTail+1);
+ return sqlite3IsShadowTableOf(db, pTab, zName);
}
#endif /* ifndef SQLITE_OMIT_VIRTUALTABLE */
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