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Overview
| Comment: | Split the SQLITE_WriteSchema flag in two flags, WriteSchema and SQLITE_NoSchemaError. Set only WriteSchema on a VACUUM to avoid problems when trying to vacuum a corrupt database. With this change, the size of the flags field on sqlite3 must grow from 32 to 64 bytes. |
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| Timelines: | family | ancestors | descendants | both | trunk |
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| SHA3-256: |
4f9878107a54356b7105fa1db7655ee2 |
| User & Date: | drh 2018-10-30 16:25:35 |
Context
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2018-10-30
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| 23:45 | Add new fuzzer cases generated by dbfuzz2. Closed-Leaf check-in: 79fdad8b user: drh tags: dbfuzz2-cases | |
| 19:14 | Update comments in sqlite3session.c to describe the format of "rebase blobs", as well as changesets and patchsets. check-in: bf93f7b5 user: dan tags: trunk | |
| 16:25 | Split the SQLITE_WriteSchema flag in two flags, WriteSchema and SQLITE_NoSchemaError. Set only WriteSchema on a VACUUM to avoid problems when trying to vacuum a corrupt database. With this change, the size of the flags field on sqlite3 must grow from 32 to 64 bytes. check-in: 4f987810 user: drh tags: trunk | |
| 15:31 | Modify the CLI so that the --deserialize option is only available if it is compiled with SQLITE_ENABLE_DESERIALIZE. DESERIALIZE is now off by default for the main.mk makefile, but on for Makefile.in and Makefile.msc. check-in: 90b2a684 user: drh tags: trunk | |
Changes
Changes to src/pragma.c.
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#ifndef SQLITE_OMIT_FLAG_PRAGMAS
case PragTyp_FLAG: {
if( zRight==0 ){
setPragmaResultColumnNames(v, pPragma);
returnSingleInt(v, (db->flags & pPragma->iArg)!=0 );
}else{
int mask = pPragma->iArg; /* Mask of bits to set or clear. */
if( db->autoCommit==0 ){
/* Foreign key support may not be enabled or disabled while not
** in auto-commit mode. */
mask &= ~(SQLITE_ForeignKeys);
}
#if SQLITE_USER_AUTHENTICATION
if( db->auth.authLevel==UAUTH_User ){
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#ifndef SQLITE_OMIT_FLAG_PRAGMAS
case PragTyp_FLAG: {
if( zRight==0 ){
setPragmaResultColumnNames(v, pPragma);
returnSingleInt(v, (db->flags & pPragma->iArg)!=0 );
}else{
u64 mask = pPragma->iArg; /* Mask of bits to set or clear. */
if( db->autoCommit==0 ){
/* Foreign key support may not be enabled or disabled while not
** in auto-commit mode. */
mask &= ~(SQLITE_ForeignKeys);
}
#if SQLITE_USER_AUTHENTICATION
if( db->auth.authLevel==UAUTH_User ){
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Changes to src/pragma.h.
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/* Definitions of all built-in pragmas */
typedef struct PragmaName {
const char *const zName; /* Name of pragma */
u8 ePragTyp; /* PragTyp_XXX value */
u8 mPragFlg; /* Zero or more PragFlg_XXX values */
u8 iPragCName; /* Start of column names in pragCName[] */
u8 nPragCName; /* Num of col names. 0 means use pragma name */
u32 iArg; /* Extra argument */
} PragmaName;
static const PragmaName aPragmaName[] = {
#if defined(SQLITE_HAS_CODEC) || defined(SQLITE_ENABLE_CEROD)
{/* zName: */ "activate_extensions",
/* ePragTyp: */ PragTyp_ACTIVATE_EXTENSIONS,
/* ePragFlg: */ 0,
/* ColNames: */ 0, 0,
................................................................................
/* iArg: */ 0 },
#endif
#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
{/* zName: */ "writable_schema",
/* ePragTyp: */ PragTyp_FLAG,
/* ePragFlg: */ PragFlg_Result0|PragFlg_NoColumns1,
/* ColNames: */ 0, 0,
/* iArg: */ SQLITE_WriteSchema },
#endif
};
/* Number of pragmas: 62 on by default, 81 total. */
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/* Definitions of all built-in pragmas */
typedef struct PragmaName {
const char *const zName; /* Name of pragma */
u8 ePragTyp; /* PragTyp_XXX value */
u8 mPragFlg; /* Zero or more PragFlg_XXX values */
u8 iPragCName; /* Start of column names in pragCName[] */
u8 nPragCName; /* Num of col names. 0 means use pragma name */
u64 iArg; /* Extra argument */
} PragmaName;
static const PragmaName aPragmaName[] = {
#if defined(SQLITE_HAS_CODEC) || defined(SQLITE_ENABLE_CEROD)
{/* zName: */ "activate_extensions",
/* ePragTyp: */ PragTyp_ACTIVATE_EXTENSIONS,
/* ePragFlg: */ 0,
/* ColNames: */ 0, 0,
................................................................................
/* iArg: */ 0 },
#endif
#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
{/* zName: */ "writable_schema",
/* ePragTyp: */ PragTyp_FLAG,
/* ePragFlg: */ PragFlg_Result0|PragFlg_NoColumns1,
/* ColNames: */ 0, 0,
/* iArg: */ SQLITE_WriteSchema|SQLITE_NoSchemaError },
#endif
};
/* Number of pragmas: 62 on by default, 81 total. */
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Changes to src/prepare.c.
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}
#endif
}
if( db->mallocFailed ){
rc = SQLITE_NOMEM_BKPT;
sqlite3ResetAllSchemasOfConnection(db);
}
if( rc==SQLITE_OK || (db->flags&SQLITE_WriteSchema)){
/* Black magic: If the SQLITE_WriteSchema flag is set, then consider
** the schema loaded, even if errors occurred. In this situation the
** current sqlite3_prepare() operation will fail, but the following one
** will attempt to compile the supplied statement against whatever subset
** of the schema was loaded before the error occurred. The primary
** purpose of this is to allow access to the sqlite_master table
** even when its contents have been corrupted.
*/
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}
#endif
}
if( db->mallocFailed ){
rc = SQLITE_NOMEM_BKPT;
sqlite3ResetAllSchemasOfConnection(db);
}
if( rc==SQLITE_OK || (db->flags&SQLITE_NoSchemaError)){
/* Black magic: If the SQLITE_NoSchemaError flag is set, then consider
** the schema loaded, even if errors occurred. In this situation the
** current sqlite3_prepare() operation will fail, but the following one
** will attempt to compile the supplied statement against whatever subset
** of the schema was loaded before the error occurred. The primary
** purpose of this is to allow access to the sqlite_master table
** even when its contents have been corrupted.
*/
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Changes to src/sqliteInt.h.
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sqlite3_vfs *pVfs; /* OS Interface */ struct Vdbe *pVdbe; /* List of active virtual machines */ CollSeq *pDfltColl; /* The default collating sequence (BINARY) */ sqlite3_mutex *mutex; /* Connection mutex */ Db *aDb; /* All backends */ int nDb; /* Number of backends currently in use */ u32 mDbFlags; /* flags recording internal state */ u32 flags; /* flags settable by pragmas. See below */ i64 lastRowid; /* ROWID of most recent insert (see above) */ i64 szMmap; /* Default mmap_size setting */ u32 nSchemaLock; /* Do not reset the schema when non-zero */ unsigned int openFlags; /* Flags passed to sqlite3_vfs.xOpen() */ int errCode; /* Most recent error code (SQLITE_*) */ int errMask; /* & result codes with this before returning */ int iSysErrno; /* Errno value from last system error */ ................................................................................ #define SQLITE_QueryOnly 0x00100000 /* Disable database changes */ #define SQLITE_CellSizeCk 0x00200000 /* Check btree cell sizes on load */ #define SQLITE_Fts3Tokenizer 0x00400000 /* Enable fts3_tokenizer(2) */ #define SQLITE_EnableQPSG 0x00800000 /* Query Planner Stability Guarantee*/ #define SQLITE_TriggerEQP 0x01000000 /* Show trigger EXPLAIN QUERY PLAN */ #define SQLITE_ResetDatabase 0x02000000 /* Reset the database */ #define SQLITE_LegacyAlter 0x04000000 /* Legacy ALTER TABLE behaviour */ /* Flags used only if debugging */ #ifdef SQLITE_DEBUG #define SQLITE_SqlTrace 0x08000000 /* Debug print SQL as it executes */ #define SQLITE_VdbeListing 0x10000000 /* Debug listings of VDBE programs */ #define SQLITE_VdbeTrace 0x20000000 /* True to trace VDBE execution */ #define SQLITE_VdbeAddopTrace 0x40000000 /* Trace sqlite3VdbeAddOp() calls */ #define SQLITE_VdbeEQP 0x80000000 /* Debug EXPLAIN QUERY PLAN */ #endif /* ** Allowed values for sqlite3.mDbFlags */ #define DBFLAG_SchemaChange 0x0001 /* Uncommitted Hash table changes */ #define DBFLAG_PreferBuiltin 0x0002 /* Preference to built-in funcs */ |
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sqlite3_vfs *pVfs; /* OS Interface */ struct Vdbe *pVdbe; /* List of active virtual machines */ CollSeq *pDfltColl; /* The default collating sequence (BINARY) */ sqlite3_mutex *mutex; /* Connection mutex */ Db *aDb; /* All backends */ int nDb; /* Number of backends currently in use */ u32 mDbFlags; /* flags recording internal state */ u64 flags; /* flags settable by pragmas. See below */ i64 lastRowid; /* ROWID of most recent insert (see above) */ i64 szMmap; /* Default mmap_size setting */ u32 nSchemaLock; /* Do not reset the schema when non-zero */ unsigned int openFlags; /* Flags passed to sqlite3_vfs.xOpen() */ int errCode; /* Most recent error code (SQLITE_*) */ int errMask; /* & result codes with this before returning */ int iSysErrno; /* Errno value from last system error */ ................................................................................ #define SQLITE_QueryOnly 0x00100000 /* Disable database changes */ #define SQLITE_CellSizeCk 0x00200000 /* Check btree cell sizes on load */ #define SQLITE_Fts3Tokenizer 0x00400000 /* Enable fts3_tokenizer(2) */ #define SQLITE_EnableQPSG 0x00800000 /* Query Planner Stability Guarantee*/ #define SQLITE_TriggerEQP 0x01000000 /* Show trigger EXPLAIN QUERY PLAN */ #define SQLITE_ResetDatabase 0x02000000 /* Reset the database */ #define SQLITE_LegacyAlter 0x04000000 /* Legacy ALTER TABLE behaviour */ #define SQLITE_NoSchemaError 0x08000000 /* Do not report schema parse errors*/ /* Flags used only if debugging */ #define HI(X) ((u64)(X)<<32) #ifdef SQLITE_DEBUG #define SQLITE_SqlTrace HI(0x0001) /* Debug print SQL as it executes */ #define SQLITE_VdbeListing HI(0x0002) /* Debug listings of VDBE progs */ #define SQLITE_VdbeTrace HI(0x0004) /* True to trace VDBE execution */ #define SQLITE_VdbeAddopTrace HI(0x0008) /* Trace sqlite3VdbeAddOp() calls */ #define SQLITE_VdbeEQP HI(0x0010) /* Debug EXPLAIN QUERY PLAN */ #endif /* ** Allowed values for sqlite3.mDbFlags */ #define DBFLAG_SchemaChange 0x0001 /* Uncommitted Hash table changes */ #define DBFLAG_PreferBuiltin 0x0002 /* Preference to built-in funcs */ |
Changes to tool/mkpragmatab.tcl.
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TYPE: FLAG ARG: SQLITE_IgnoreChecks IF: !defined(SQLITE_OMIT_FLAG_PRAGMAS) IF: !defined(SQLITE_OMIT_CHECK) NAME: writable_schema TYPE: FLAG ARG: SQLITE_WriteSchema IF: !defined(SQLITE_OMIT_FLAG_PRAGMAS) NAME: read_uncommitted TYPE: FLAG ARG: SQLITE_ReadUncommit IF: !defined(SQLITE_OMIT_FLAG_PRAGMAS) ................................................................................ puts $fd "typedef struct PragmaName \173" puts $fd " const char *const zName; /* Name of pragma */" puts $fd " u8 ePragTyp; /* PragTyp_XXX value */" puts $fd " u8 mPragFlg; /* Zero or more PragFlg_XXX values */" puts $fd { u8 iPragCName; /* Start of column names in pragCName[] */} puts $fd " u8 nPragCName; \ /* Num of col names. 0 means use pragma name */" puts $fd " u32 iArg; /* Extra argument */" puts $fd "\175 PragmaName;" puts $fd "static const PragmaName aPragmaName\[\] = \173" set current_if {} set spacer [format { %26s } {}] foreach name $allnames { foreach {type arg if flag cx} $allbyname($name) break |
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TYPE: FLAG ARG: SQLITE_IgnoreChecks IF: !defined(SQLITE_OMIT_FLAG_PRAGMAS) IF: !defined(SQLITE_OMIT_CHECK) NAME: writable_schema TYPE: FLAG ARG: SQLITE_WriteSchema|SQLITE_NoSchemaError IF: !defined(SQLITE_OMIT_FLAG_PRAGMAS) NAME: read_uncommitted TYPE: FLAG ARG: SQLITE_ReadUncommit IF: !defined(SQLITE_OMIT_FLAG_PRAGMAS) ................................................................................ puts $fd "typedef struct PragmaName \173" puts $fd " const char *const zName; /* Name of pragma */" puts $fd " u8 ePragTyp; /* PragTyp_XXX value */" puts $fd " u8 mPragFlg; /* Zero or more PragFlg_XXX values */" puts $fd { u8 iPragCName; /* Start of column names in pragCName[] */} puts $fd " u8 nPragCName; \ /* Num of col names. 0 means use pragma name */" puts $fd " u64 iArg; /* Extra argument */" puts $fd "\175 PragmaName;" puts $fd "static const PragmaName aPragmaName\[\] = \173" set current_if {} set spacer [format { %26s } {}] foreach name $allnames { foreach {type arg if flag cx} $allbyname($name) break |