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Fix for CVE-2018-8740: https://nvd.nist.gov/vuln/detail/CVE-2018-8740
Detect databases whose schema is corrupted using a CREATE TABLE AS statement and issue an appropriate error message.
Commit [d75e6765]: https://www.sqlite.org/src/info/d75e67654aa9620b
Description: https://bugs.launchpad.net/ubuntu/+source/sqlite3/+bug/1756349
--- sqlite3.c.orig 2018-03-22 07:08:21 UTC
+++ sqlite3.c
@@ -103474,8 +103474,6 @@ SQLITE_PRIVATE void sqlite3EndTable(
p = pParse->pNewTable;
if( p==0 ) return;
- assert( !db->init.busy || !pSelect );
-
/* If the db->init.busy is 1 it means we are reading the SQL off the
** "sqlite_master" or "sqlite_temp_master" table on the disk.
** So do not write to the disk again. Extract the root page number
@@ -103486,6 +103484,10 @@ SQLITE_PRIVATE void sqlite3EndTable(
** table itself. So mark it read-only.
*/
if( db->init.busy ){
+ if( pSelect ){
+ sqlite3ErrorMsg(pParse, "");
+ return;
+ }
p->tnum = db->init.newTnum;
if( p->tnum==1 ) p->tabFlags |= TF_Readonly;
}
@@ -117813,7 +117815,7 @@ static void corruptSchema(
char *z;
if( zObj==0 ) zObj = "?";
z = sqlite3MPrintf(db, "malformed database schema (%s)", zObj);
- if( zExtra ) z = sqlite3MPrintf(db, "%z - %s", z, zExtra);
+ if( zExtra && zExtra[0] ) z = sqlite3MPrintf(db, "%z - %s", z, zExtra);
sqlite3DbFree(db, *pData->pzErrMsg);
*pData->pzErrMsg = z;
}
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