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Overview
| Comment: | Never leave an open file descriptor pointing into the middle of the database file if the file descriptor number is 2 or less. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | overwrite-avoidance |
| Files: | files | file ages | folders |
| SHA1: | 3426673e4659eb68dbd14a3e41d4620d748432db |
| User & Date: | drh 2013-08-29 21:26:26 |
Context
|
2013-08-29
| ||
| 23:34 | Change the unix VFS so that it refuses to open a database file using a file descriptor less than 3. Closed-Leaf check-in: 66dddda0 user: drh tags: overwrite-avoidance | |
| 21:26 | Never leave an open file descriptor pointing into the middle of the database file if the file descriptor number is 2 or less. check-in: 3426673e user: drh tags: overwrite-avoidance | |
| 14:56 | Restore fix [f15591f802], which was accidentally clobbered by the stat4 merge. check-in: d4b6ad33 user: dan tags: trunk | |
Changes
Changes to src/os_unix.c.
584 585 586 587 588 589 590 591 592 593 594 595 596 597 .... 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 .... 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 |
if( osFstat(fd, &statbuf)==0
&& statbuf.st_size==0
&& (statbuf.st_mode&0777)!=m
){
osFchmod(fd, m);
}
}
#if defined(FD_CLOEXEC) && (!defined(O_CLOEXEC) || O_CLOEXEC==0)
osFcntl(fd, F_SETFD, osFcntl(fd, F_GETFD, 0) | FD_CLOEXEC);
#endif
}
return fd;
}
................................................................................
}else if( got>0 ){
cnt -= got;
offset += got;
prior += got;
pBuf = (void*)(got + (char*)pBuf);
}
}while( got>0 );
TIMER_END;
OSTRACE(("READ %-3d %5d %7lld %llu\n",
id->h, got+prior, offset-prior, TIMER_ELAPSED));
return got+prior;
}
/*
................................................................................
if( iSeek!=iOff ){
if( piErrno ) *piErrno = (iSeek==-1 ? errno : 0);
return -1;
}
rc = osWrite(fd, pBuf, nBuf);
}while( rc<0 && errno==EINTR );
#endif
TIMER_END;
OSTRACE(("WRITE %-3d %5d %7lld %llu\n", fd, rc, iOff, TIMER_ELAPSED));
if( rc<0 && piErrno ) *piErrno = errno;
return rc;
}
|
> > > |
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 .... 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 .... 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 |
if( osFstat(fd, &statbuf)==0
&& statbuf.st_size==0
&& (statbuf.st_mode&0777)!=m
){
osFchmod(fd, m);
}
}
if( fd<=2 ) lseek(fd, 0, SEEK_END);
#if defined(FD_CLOEXEC) && (!defined(O_CLOEXEC) || O_CLOEXEC==0)
osFcntl(fd, F_SETFD, osFcntl(fd, F_GETFD, 0) | FD_CLOEXEC);
#endif
}
return fd;
}
................................................................................
}else if( got>0 ){
cnt -= got;
offset += got;
prior += got;
pBuf = (void*)(got + (char*)pBuf);
}
}while( got>0 );
if( id->h<=2 ) lseek(id->h, 0, SEEK_END);
TIMER_END;
OSTRACE(("READ %-3d %5d %7lld %llu\n",
id->h, got+prior, offset-prior, TIMER_ELAPSED));
return got+prior;
}
/*
................................................................................
if( iSeek!=iOff ){
if( piErrno ) *piErrno = (iSeek==-1 ? errno : 0);
return -1;
}
rc = osWrite(fd, pBuf, nBuf);
}while( rc<0 && errno==EINTR );
#endif
if( fd<=2 ) lseek(fd, 0, SEEK_END);
TIMER_END;
OSTRACE(("WRITE %-3d %5d %7lld %llu\n", fd, rc, iOff, TIMER_ELAPSED));
if( rc<0 && piErrno ) *piErrno = errno;
return rc;
}
|