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Overview
| Comment: | Avoid casting a value larger than 2^31 to a (size_t) on systems where it is a 32-bit type. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | mmap-size-limit |
| Files: | files | file ages | folders |
| SHA3-256: |
46c3085dcad6372ac20eff499e17fe11 |
| User & Date: | dan 2017-08-07 18:13:28 |
Context
|
2017-08-07
| ||
| 18:27 | Update bigmmap.test to account for builds that use "-DSQLITE_MAX_MMAP_SIZE=<integer-constant>LL". check-in: 7c8b6f1c user: dan tags: mmap-size-limit | |
| 18:13 | Avoid casting a value larger than 2^31 to a (size_t) on systems where it is a 32-bit type. check-in: 46c3085d user: dan tags: mmap-size-limit | |
| 17:28 | Fix an out-of-order test number. check-in: 38f30091 user: mistachkin tags: trunk | |
Changes
Changes to src/os_unix.c.
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#if SQLITE_MAX_MMAP_SIZE>0
case SQLITE_FCNTL_MMAP_SIZE: {
i64 newLimit = *(i64*)pArg;
int rc = SQLITE_OK;
if( newLimit>sqlite3GlobalConfig.mxMmap ){
newLimit = sqlite3GlobalConfig.mxMmap;
}
*(i64*)pArg = pFile->mmapSizeMax;
if( newLimit>=0 && newLimit!=pFile->mmapSizeMax && pFile->nFetchOut==0 ){
pFile->mmapSizeMax = newLimit;
if( pFile->mmapSize>0 ){
unixUnmapfile(pFile);
rc = unixMapfile(pFile, -1);
}
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> > > > > > > |
3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 |
#if SQLITE_MAX_MMAP_SIZE>0
case SQLITE_FCNTL_MMAP_SIZE: {
i64 newLimit = *(i64*)pArg;
int rc = SQLITE_OK;
if( newLimit>sqlite3GlobalConfig.mxMmap ){
newLimit = sqlite3GlobalConfig.mxMmap;
}
/* The value of newLimit may be eventually cast to (size_t) and passed
** to mmap(). Restrict its value to 2GB if (size_t) is a 32-bit type. */
if( sizeof(size_t)<8 ){
newLimit = (newLimit & 0x7FFFFFFF);
}
*(i64*)pArg = pFile->mmapSizeMax;
if( newLimit>=0 && newLimit!=pFile->mmapSizeMax && pFile->nFetchOut==0 ){
pFile->mmapSizeMax = newLimit;
if( pFile->mmapSize>0 ){
unixUnmapfile(pFile);
rc = unixMapfile(pFile, -1);
}
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