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Overview
| Comment: | Detect and report oversized records constructed from multiple zeroblobs. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
9e139afd92116ebc593114ed63b57c8f |
| User & Date: | drh 2015-04-11 02:08:48 |
References
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2015-05-20
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| 19:53 | Detect and report oversized records constructed from multiple zeroblobs. Cherrypick of [9e139afd9211]. check-in: 4a08f6b8 user: dan tags: branch-3.8.6 | |
Context
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2015-05-20
| ||
| 19:53 | Detect and report oversized records constructed from multiple zeroblobs. Cherrypick of [9e139afd9211]. check-in: 4a08f6b8 user: dan tags: branch-3.8.6 | |
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2015-04-11
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| 11:44 | Do not assume an index contains unique entries unless it is declared UNIQUE and NOT NULL is specified for all columns. Fix for [7b4fee9f6c]. check-in: e3b1f625 user: dan tags: trunk | |
| 02:08 | Detect and report oversized records constructed from multiple zeroblobs. check-in: 9e139afd user: drh tags: trunk | |
|
2015-04-10
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| 21:16 | Minor build enhancements for MSVC. check-in: 40c417a7 user: mistachkin tags: trunk | |
Changes
Changes to src/vdbe.c.
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*/
case OP_MakeRecord: {
u8 *zNewRecord; /* A buffer to hold the data for the new record */
Mem *pRec; /* The new record */
u64 nData; /* Number of bytes of data space */
int nHdr; /* Number of bytes of header space */
i64 nByte; /* Data space required for this record */
int nZero; /* Number of zero bytes at the end of the record */
int nVarint; /* Number of bytes in a varint */
u32 serial_type; /* Type field */
Mem *pData0; /* First field to be combined into the record */
Mem *pLast; /* Last field of the record */
int nField; /* Number of fields in the record */
char *zAffinity; /* The affinity string for the record */
int file_format; /* File format to use for encoding */
................................................................................
}else{
/* Rare case of a really large header */
nVarint = sqlite3VarintLen(nHdr);
nHdr += nVarint;
if( nVarint<sqlite3VarintLen(nHdr) ) nHdr++;
}
nByte = nHdr+nData;
if( nByte>db->aLimit[SQLITE_LIMIT_LENGTH] ){
goto too_big;
}
/* Make sure the output register has a buffer large enough to store
** the new record. The output register (pOp->p3) is not allowed to
** be one of the input registers (because the following call to
** sqlite3VdbeMemClearAndResize() could clobber the value before it is used).
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....
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*/
case OP_MakeRecord: {
u8 *zNewRecord; /* A buffer to hold the data for the new record */
Mem *pRec; /* The new record */
u64 nData; /* Number of bytes of data space */
int nHdr; /* Number of bytes of header space */
i64 nByte; /* Data space required for this record */
i64 nZero; /* Number of zero bytes at the end of the record */
int nVarint; /* Number of bytes in a varint */
u32 serial_type; /* Type field */
Mem *pData0; /* First field to be combined into the record */
Mem *pLast; /* Last field of the record */
int nField; /* Number of fields in the record */
char *zAffinity; /* The affinity string for the record */
int file_format; /* File format to use for encoding */
................................................................................
}else{
/* Rare case of a really large header */
nVarint = sqlite3VarintLen(nHdr);
nHdr += nVarint;
if( nVarint<sqlite3VarintLen(nHdr) ) nHdr++;
}
nByte = nHdr+nData;
if( nByte+nZero>db->aLimit[SQLITE_LIMIT_LENGTH] ){
goto too_big;
}
/* Make sure the output register has a buffer large enough to store
** the new record. The output register (pOp->p3) is not allowed to
** be one of the input registers (because the following call to
** sqlite3VdbeMemClearAndResize() could clobber the value before it is used).
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Changes to test/zeroblob.test.
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do_test zeroblob-9.7 {
db eval {SELECT zeroblob(2) IN (zeroblob(3))}
} {0}
do_test zeroblob-9.8 {
db eval {SELECT zeroblob(2) IN (zeroblob(2))}
} {1}
finish_test
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> | > > > > > > > > |
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do_test zeroblob-9.7 {
db eval {SELECT zeroblob(2) IN (zeroblob(3))}
} {0}
do_test zeroblob-9.8 {
db eval {SELECT zeroblob(2) IN (zeroblob(2))}
} {1}
# Oversized zeroblob records
#
do_test zeroblob-10.1 {
db eval {
CREATE TABLE t10(a,b,c);
}
catchsql {INSERT INTO t10 VALUES(zeroblob(1e9),zeroblob(1e9),zeroblob(1e9))}
} {1 {string or blob too big}}
finish_test
|