skysiders opened a new pull request, #3894:
URL: https://github.com/apache/hive/pull/3894
In the QueryResultsCache function of class QueryResultsCache, there is the
following code segment
```java
private QueryResultsCache(HiveConf configuration) throws IOException {
......
FileSystem fs = cacheDirPath.getFileSystem(conf);
FsPermission fsPermission = new FsPermission("700");
fs.mkdirs(cacheDirPath, fsPermission);
......
}
```
It can be seen that the function will use the mkdirs to create cacheDirPath,
and the parameters passed in include the path variable cacheDirPath and a
permission 700. But we haven't confirmed whether the permission is correctly
assigned to the file.
The above question is raised because there are two mkdir functions of
hadoop,`mkdirs(Path f, FsPermission permission)` with `mkdirs(FileSystem fs,
Path dir, FsPermission permission)`and the first one is used here. The
permissions of this function will be affected by the underlying umask. Although
700 here will hardly be affected by umask, but I think from a rigorous point of
view, we should have one more permission check and permission grant here. So I
judge whether the file permission is correctly granted by detecting the
influence of umask on the permission, and if not, give it the correct
permission through setPermission.
```java
if
(!permission.equals(permission.applyUMask(FsPermission.getUMask(conf)))) {
fs.setPermission(dir, permission);
}
```
And I find same issue in other three methods here.
In class Context
```java
private Path getScratchDir(String scheme, String authority,
boolean mkdir, String scratchDir) {
......
FileSystem fs = dirPath.getFileSystem(conf);
dirPath = new Path(fs.makeQualified(dirPath).toString());
FsPermission fsPermission = new FsPermission(scratchDirPermission);
if (!fs.mkdirs(dirPath, fsPermission)) {
throw new RuntimeException("Cannot make directory: "
+ dirPath.toString());
......
}
```
In class SessionState
```java
static void createPath(HiveConf conf, Path path, String permission,
boolean isLocal,
boolean isCleanUp) throws IOException {
FsPermission fsPermission = new FsPermission(permission);
FileSystem fs;
......
if (!fs.mkdirs(path, fsPermission)) {
throw new IOException("Failed to create directory " + path + " on fs "
+ fs.getUri());
}
......
}
```
and in class TezSessionState
```java
private Path createTezDir(String sessionId, String suffix) throws
IOException {
......
Path tezDir = new Path(hdfsScratchDir, TEZ_DIR);
FileSystem fs = tezDir.getFileSystem(conf);
FsPermission fsPermission = new FsPermission(HiveConf.getVar(conf,
HiveConf.ConfVars.SCRATCHDIRPERMISSION));
fs.mkdirs(tezDir, fsPermission);
......
}
```
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