archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-08-28 15:24:43 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8229872: (fs) Increase buffer size used with getmntent

Browse source 
Dynamically allocate memory for getmntent

Reviewed-by: alanb
This commit is contained in:
Vladimir Kempik 2019-09-24 14:54:57 +03:00
parent 628283fe53
commit 67ad501e5b
5 changed files with 89 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

20
src/java.base/linux/classes/sun/nio/fs/LinuxFileSystem.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -79,10 +79,26 @@ class LinuxFileSystem extends UnixFileSystem {
ArrayList<UnixMountEntry> entries = new ArrayList<>();
try {
long fp = setmntent(Util.toBytes(fstab), Util.toBytes("r"));
int maxLineSize = 1024;
try {
for (;;) {
int lineSize = getlinelen(fp);
if (lineSize == -1)
break;
if (lineSize > maxLineSize)
maxLineSize = lineSize;
}
} catch (UnixException x) {
// nothing we need to do
} finally {
rewind(fp);
}
try {
for (;;) {
UnixMountEntry entry = new UnixMountEntry();
int res = getmntent(fp, entry);
// count in NUL character at the end
int res = getmntent(fp, entry, maxLineSize + 1);
if (res < 0)
break;
entries.add(entry);

12
src/java.base/linux/classes/sun/nio/fs/LinuxNativeDispatcher.java
View file

@ -51,7 +51,17 @@ class LinuxNativeDispatcher extends UnixNativeDispatcher {
/**
* int getmntent(FILE *fp, struct mnttab *mp, int len);
*/
static native int getmntent(long fp, UnixMountEntry entry)
static int getmntent(long fp, UnixMountEntry entry, int buflen) throws UnixException {
NativeBuffer buffer = NativeBuffers.getNativeBuffer(buflen);
try {
return getmntent0(fp, entry, buffer.address(), buflen);
} finally {
buffer.release();
}
}
static native int getmntent0(long fp, UnixMountEntry entry, long buffer, int bufLen)
throws UnixException;
/**