lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[PATCH] r/o bind mounts: elevate write count for ioctls()

Browse Source 
Some ioctl()s can cause writes to the filesystem.  Take these, and make them
use mnt_want/drop_write() instead.

[AV: updated]

Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Dave Hansen
2008-02-15 14:37:46 -08:00
committed by Al Viro
parent 20ddee2c75
commit 42a74f206b
9 changed files with 264 additions and 154 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
fs/ocfs2/ioctl.c
View File

@@ -60,10 +60,6 @@ static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
goto bail;
}
status = -EROFS;
if (IS_RDONLY(inode))
goto bail_unlock;
status = -EACCES;
if (!is_owner_or_cap(inode))
goto bail_unlock;
@@ -134,8 +130,13 @@ long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (get_user(flags, (int __user *) arg))
return -EFAULT;
return ocfs2_set_inode_attr(inode, flags,
status = mnt_want_write(filp->f_path.mnt);
if (status)
return status;
status = ocfs2_set_inode_attr(inode, flags,
OCFS2_FL_MODIFIABLE);
mnt_drop_write(filp->f_path.mnt);
return status;
case OCFS2_IOC_RESVSP:
case OCFS2_IOC_RESVSP64:
case OCFS2_IOC_UNRESVSP: