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Commit b1da47e2 authored by Miklos Szeredi's avatar Miklos Szeredi Committed by Al Viro
Browse files

[patch 3/4] fat: dont call notify_change 



The FAT_IOCTL_SET_ATTRIBUTES ioctl() calls notify_change() to change
the file mode before changing the inode attributes.  Replace with
explicit calls to security_inode_setattr(), fat_setattr() and
fsnotify_change().

This is equivalent to the original.  The reason it is needed, is that
later in the series we move the immutable check into notify_change().
That would break the FAT_IOCTL_SET_ATTRIBUTES ioctl, as it needs to
perform the mode change regardless of the immutability of the file.

[Fix error if fat is built as a module.  Thanks to OGAWA Hirofumi for
noticing.]

Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
Acked-by: default avatarOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent e9b76fed

fs/fat/file.c

+14 −1
Original line number Diff line number Diff line
@@ -15,6 +15,8 @@ 
#include <linux/writeback.h>

#include <linux/backing-dev.h>

#include <linux/blkdev.h>

#include <linux/fsnotify.h>

#include <linux/security.h>



int fat_generic_ioctl(struct inode *inode, struct file *filp,

		      unsigned int cmd, unsigned long arg)
@@ -64,6 +66,7 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp, 


		/* Equivalent to a chmod() */

		ia.ia_valid = ATTR_MODE | ATTR_CTIME;

		ia.ia_ctime = current_fs_time(inode->i_sb);

		if (is_dir) {

			ia.ia_mode = MSDOS_MKMODE(attr,

				S_IRWXUGO & ~sbi->options.fs_dmask)
@@ -90,11 +93,21 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp, 
			}

		}



		/*

		 * The security check is questionable...  We single

		 * out the RO attribute for checking by the security

		 * module, just because it maps to a file mode.

		 */

		err = security_inode_setattr(filp->f_path.dentry, &ia);

		if (err)

			goto up;



		/* This MUST be done before doing anything irreversible... */

		err = notify_change(filp->f_path.dentry, &ia);

		err = fat_setattr(filp->f_path.dentry, &ia);

		if (err)

			goto up;



		fsnotify_change(filp->f_path.dentry, ia.ia_valid);

		if (sbi->options.sys_immutable) {

			if (attr & ATTR_SYS)

				inode->i_flags |= S_IMMUTABLE;

security/security.c

+1 −0
Original line number Diff line number Diff line
@@ -442,6 +442,7 @@ int security_inode_setattr(struct dentry *dentry, struct iattr *attr) 
		return 0;

	return security_ops->inode_setattr(dentry, attr);

}

EXPORT_SYMBOL_GPL(security_inode_setattr);



int security_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)

{