samsung update 1

1 files changed, 59 insertions, 0 deletions

diff --git a/fs/fat/file.c b/fs/fat/file.c
index 7018e1d..7279b96 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -17,6 +17,7 @@
 #include <linux/blkdev.h>
 #include <linux/fsnotify.h>
 #include <linux/security.h>
+#include <linux/namei.h>
 #include "fat.h"
 
 static int fat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
@@ -115,6 +116,62 @@ out:
 	return err;
 }
 
+extern int _fat_fallocate(struct inode *inode, loff_t len);
+
+static long fat_vmw_extend(struct file *filp, unsigned long len)
+{
+	struct inode *inode = filp->f_path.dentry->d_inode;
+	loff_t off = len;
+	const char mvpEnabledPath[] = "/data/data/com.vmware.mvp.enabled";
+	struct path path;
+	struct kstat stat;
+	int err;
+
+	/*
+	 * Perform some sanity checks (from do_fallocate)
+	 */
+
+	if (len <= 0) {
+		return -EINVAL;
+	}
+
+	if (!(filp->f_mode & FMODE_WRITE)) {
+		return -EBADF;
+	}
+
+	/*
+	 * Revalidate the write permissions, in case security policy has
+	 * changed since the files were opened.
+	 */
+	err = security_file_permission(filp, MAY_WRITE);
+	if (err) {
+		return err;
+	}
+
+	/*
+	 * Verify caller process belongs to mvp.
+	 */
+
+	err = kern_path(mvpEnabledPath, 0, &path);
+	if (err) {
+		return err;
+	}
+
+	err = vfs_getattr(path.mnt, path.dentry, &stat);
+	if (err) {
+		return err;
+	}
+
+	if (current_euid() != stat.uid && current_euid() != 0) {
+		return -EPERM;
+	}
+
+	/*
+	 * Every thing is clear, let's allocate space.
+	 */
+	return _fat_fallocate(inode, off);
+}
+
 long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	struct inode *inode = filp->f_path.dentry->d_inode;
@@ -125,6 +182,8 @@ long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		return fat_ioctl_get_attributes(inode, user_attr);
 	case FAT_IOCTL_SET_ATTRIBUTES:
 		return fat_ioctl_set_attributes(filp, user_attr);
+	case FAT_IOCTL_VMW_EXTEND:
+		return fat_vmw_extend(filp, arg);
 	default:
 		return -ENOTTY;	/* Inappropriate ioctl for device */
 	}