[PATCH 2/2] Disallow seeks on sysfs files.

[Mitch Williams]

This patch causes an error return if the user attempts to seek on a sysfs
file.

The patch was generated from 2.6.11-rc1.

Signed-off-by:  Mitch Williams <mitch.a.williams@xxxxxxxxx>

diff -urpN -X dontdiff linux-2.6.11-clean/fs/sysfs/file.c linux-2.6.11/fs/sysfs/file.c
--- linux-2.6.11-clean/fs/sysfs/file.c	2004-12-24 13:33:50.000000000 -0800
+++ linux-2.6.11/fs/sysfs/file.c	2005-01-25 10:28:25.000000000 -0800
@@ -307,6 +307,10 @@ static int check_perm(struct inode * ino
 		file->private_data = buffer;
 	} else
 		error = -ENOMEM;
+
+	/*  Set mode bits to disallow seeking.  */
+	file->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
+
 	goto Done;

  Einval:
@@ -349,7 +353,7 @@ static int sysfs_release(struct inode *
 struct file_operations sysfs_file_operations = {
 	.read		= sysfs_read_file,
 	.write		= sysfs_write_file,
-	.llseek		= generic_file_llseek,
+	.llseek		= no_llseek,
 	.open		= sysfs_open_file,
 	.release	= sysfs_release,
 };
-
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