Eric Lee / linux-smarc-t335x-v3.2

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fs/nfsctl.c 2.08 KB
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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  /*
   *	fs/nfsctl.c
   *
   *	This should eventually move to userland.
   *
   */
715b49ef2   Alan Cox   [PATCH] EDAC: ato... 
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  #include <linux/types.h>
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  #include <linux/file.h>
  #include <linux/fs.h>
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  #include <linux/nfsd/syscall.h>
9789cfe22   Randy Dunlap   nfsctl: add heade... 
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  #include <linux/cred.h>
  #include <linux/sched.h>
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  #include <linux/linkage.h>
  #include <linux/namei.h>
  #include <linux/mount.h>
  #include <linux/syscalls.h>
  #include <asm/uaccess.h>
  
  /*
   * open a file on nfsd fs
   */
  
  static struct file *do_open(char *name, int flags)
  {
16b6287a5   Josef 'Jeff' Sipek   nfsctl: use vfs_p... 
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  	struct vfsmount *mnt;
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  	struct file *file;
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 Josef 'Jeff' Sipek
 
nfsctl: use vfs_p...




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  	mnt = do_kern_mount("nfsd", 0, "nfsd", NULL);
  	if (IS_ERR(mnt))
  		return (struct file *)mnt;









1da177e4c
 
 Linus Torvalds
 
Linux-2.6.12-rc2




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73d049a40
 
 Al Viro
 
open-style analog...




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  	file = file_open_root(mnt->mnt_root, mnt, name, flags);









1da177e4c
 
 Linus Torvalds
 
Linux-2.6.12-rc2




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73d049a40
 
 Al Viro
 
open-style analog...




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  	mntput(mnt);	/* drop do_kern_mount reference */
  	return file;









1da177e4c
 
 Linus Torvalds
 
Linux-2.6.12-rc2




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  }
  
  static struct {
  	char *name; int wsize; int rsize;
  } map[] = {
  	[NFSCTL_SVC] = {
  		.name	= ".svc",
  		.wsize	= sizeof(struct nfsctl_svc)
  	},
  	[NFSCTL_ADDCLIENT] = {
  		.name	= ".add",
  		.wsize	= sizeof(struct nfsctl_client)
  	},
  	[NFSCTL_DELCLIENT] = {
  		.name	= ".del",
  		.wsize	= sizeof(struct nfsctl_client)
  	},
  	[NFSCTL_EXPORT] = {
  		.name	= ".export",
  		.wsize	= sizeof(struct nfsctl_export)
  	},
  	[NFSCTL_UNEXPORT] = {
  		.name	= ".unexport",
  		.wsize	= sizeof(struct nfsctl_export)
  	},
  	[NFSCTL_GETFD] = {
  		.name	= ".getfd",
  		.wsize	= sizeof(struct nfsctl_fdparm),
  		.rsize	= NFS_FHSIZE
  	},
  	[NFSCTL_GETFS] = {
  		.name	= ".getfs",
  		.wsize	= sizeof(struct nfsctl_fsparm),
  		.rsize	= sizeof(struct knfsd_fh)
  	},
  };









1e7bfb213
 
 Heiko Carstens
 
[CVE-2009-0029] S...




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  SYSCALL_DEFINE3(nfsservctl, int, cmd, struct nfsctl_arg __user *, arg,
  		void __user *, res)









1da177e4c
 
 Linus Torvalds
 
Linux-2.6.12-rc2




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  {
  	struct file *file;
  	void __user *p = &arg->u;
  	int version;
  	int err;
  
  	if (copy_from_user(&version, &arg->ca_version, sizeof(int)))
  		return -EFAULT;









85c6932ef
 
 Peter Staubach
 
[PATCH] nfsservct...




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  	if (version != NFSCTL_VERSION)









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 Linus Torvalds
 
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  		return -EINVAL;









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 Linus Torvalds
 
Linux-2.6.12-rc2




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 Tobias Klauser
 
[PATCH] fs: Use A...




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  	if (cmd < 0 || cmd >= ARRAY_SIZE(map) || !map[cmd].name)









1da177e4c
 
 Linus Torvalds
 
Linux-2.6.12-rc2




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  		return -EINVAL;
  
  	file = do_open(map[cmd].name, map[cmd].rsize ? O_RDWR : O_WRONLY);	
  	if (IS_ERR(file))
  		return PTR_ERR(file);
  	err = file->f_op->write(file, p, map[cmd].wsize, &file->f_pos);
  	if (err >= 0 && map[cmd].rsize)
  		err = file->f_op->read(file, res, map[cmd].rsize, &file->f_pos);
  	if (err >= 0)
  		err = 0;
  	fput(file);
  	return err;
  }