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/*-
* Copyright (c) 1999-2001 Robert N. M. Watson
* All rights reserved.
*
* This software was developed by Robert Watson for the TrustedBSD Project.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/kern/vfs_extattr.c 233353 2012-03-23 11:26:54Z kib $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/capability.h>
#include <sys/lock.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/sysproto.h>
#include <sys/fcntl.h>
#include <sys/namei.h>
#include <sys/filedesc.h>
#include <sys/limits.h>
#include <sys/vnode.h>
#include <sys/proc.h>
#include <sys/extattr.h>
#include <security/audit/audit.h>
#include <security/mac/mac_framework.h>
/*
* Syscall to push extended attribute configuration information into the VFS.
* Accepts a path, which it converts to a mountpoint, as well as a command
* (int cmd), and attribute name and misc data.
*
* Currently this is used only by UFS1 extended attributes.
*/
int
sys_extattrctl(td, uap)
struct thread *td;
struct extattrctl_args /* {
const char *path;
int cmd;
const char *filename;
int attrnamespace;
const char *attrname;
} */ *uap;
{
struct vnode *filename_vp;
struct nameidata nd;
struct mount *mp, *mp_writable;
char attrname[EXTATTR_MAXNAMELEN];
int vfslocked, fnvfslocked, error;
AUDIT_ARG_CMD(uap->cmd);
AUDIT_ARG_VALUE(uap->attrnamespace);
/*
* uap->attrname is not always defined. We check again later when we
* invoke the VFS call so as to pass in NULL there if needed.
*/
if (uap->attrname != NULL) {
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return (error);
}
AUDIT_ARG_TEXT(attrname);
vfslocked = fnvfslocked = 0;
mp = NULL;
filename_vp = NULL;
if (uap->filename != NULL) {
NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW | AUDITVNODE2,
UIO_USERSPACE, uap->filename, td);
error = namei(&nd);
if (error)
return (error);
fnvfslocked = NDHASGIANT(&nd);
filename_vp = nd.ni_vp;
NDFREE(&nd, NDF_NO_VP_RELE);
}
/* uap->path is always defined. */
NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW | LOCKLEAF | AUDITVNODE1,
UIO_USERSPACE, uap->path, td);
error = namei(&nd);
if (error)
goto out;
vfslocked = NDHASGIANT(&nd);
mp = nd.ni_vp->v_mount;
error = vfs_busy(mp, 0);
if (error) {
NDFREE(&nd, 0);
mp = NULL;
goto out;
}
VOP_UNLOCK(nd.ni_vp, 0);
error = vn_start_write(nd.ni_vp, &mp_writable, V_WAIT | PCATCH);
NDFREE(&nd, NDF_NO_VP_UNLOCK);
if (error)
goto out;
if (filename_vp != NULL) {
/*
* uap->filename is not always defined. If it is,
* grab a vnode lock, which VFS_EXTATTRCTL() will
* later release.
*/
error = vn_lock(filename_vp, LK_EXCLUSIVE);
if (error) {
vn_finished_write(mp_writable);
goto out;
}
}
error = VFS_EXTATTRCTL(mp, uap->cmd, filename_vp, uap->attrnamespace,
uap->attrname != NULL ? attrname : NULL);
vn_finished_write(mp_writable);
out:
if (mp != NULL)
vfs_unbusy(mp);
/*
* VFS_EXTATTRCTL will have unlocked, but not de-ref'd, filename_vp,
* so vrele it if it is defined.
*/
if (filename_vp != NULL)
vrele(filename_vp);
VFS_UNLOCK_GIANT(fnvfslocked);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
/*-
* Set a named extended attribute on a file or directory
*
* Arguments: unlocked vnode "vp", attribute namespace "attrnamespace",
* kernelspace string pointer "attrname", userspace buffer
* pointer "data", buffer length "nbytes", thread "td".
* Returns: 0 on success, an error number otherwise
* Locks: none
* References: vp must be a valid reference for the duration of the call
*/
static int
extattr_set_vp(struct vnode *vp, int attrnamespace, const char *attrname,
void *data, size_t nbytes, struct thread *td)
{
struct mount *mp;
struct uio auio;
struct iovec aiov;
ssize_t cnt;
int error;
VFS_ASSERT_GIANT(vp->v_mount);
error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
if (error)
return (error);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
aiov.iov_base = data;
aiov.iov_len = nbytes;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
if (nbytes > IOSIZE_MAX) {
error = EINVAL;
goto done;
}
auio.uio_resid = nbytes;
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
cnt = nbytes;
#ifdef MAC
error = mac_vnode_check_setextattr(td->td_ucred, vp, attrnamespace,
attrname);
if (error)
goto done;
#endif
error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio,
td->td_ucred, td);
cnt -= auio.uio_resid;
td->td_retval[0] = cnt;
done:
VOP_UNLOCK(vp, 0);
vn_finished_write(mp);
return (error);
}
int
sys_extattr_set_fd(td, uap)
struct thread *td;
struct extattr_set_fd_args /* {
int fd;
int attrnamespace;
const char *attrname;
void *data;
size_t nbytes;
} */ *uap;
{
struct file *fp;
char attrname[EXTATTR_MAXNAMELEN];
int vfslocked, error;
AUDIT_ARG_FD(uap->fd);
AUDIT_ARG_VALUE(uap->attrnamespace);
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
AUDIT_ARG_TEXT(attrname);
error = getvnode(td->td_proc->p_fd, uap->fd, CAP_EXTATTR_SET, &fp);
if (error)
return (error);
vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
error = extattr_set_vp(fp->f_vnode, uap->attrnamespace,
attrname, uap->data, uap->nbytes, td);
fdrop(fp, td);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
int
sys_extattr_set_file(td, uap)
struct thread *td;
struct extattr_set_file_args /* {
const char *path;
int attrnamespace;
const char *attrname;
void *data;
size_t nbytes;
} */ *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int vfslocked, error;
AUDIT_ARG_VALUE(uap->attrnamespace);
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
AUDIT_ARG_TEXT(attrname);
NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW | AUDITVNODE1, UIO_USERSPACE,
uap->path, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vfslocked = NDHASGIANT(&nd);
error = extattr_set_vp(nd.ni_vp, uap->attrnamespace, attrname,
uap->data, uap->nbytes, td);
vrele(nd.ni_vp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
int
sys_extattr_set_link(td, uap)
struct thread *td;
struct extattr_set_link_args /* {
const char *path;
int attrnamespace;
const char *attrname;
void *data;
size_t nbytes;
} */ *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int vfslocked, error;
AUDIT_ARG_VALUE(uap->attrnamespace);
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
AUDIT_ARG_TEXT(attrname);
NDINIT(&nd, LOOKUP, MPSAFE | NOFOLLOW | AUDITVNODE1, UIO_USERSPACE,
uap->path, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vfslocked = NDHASGIANT(&nd);
error = extattr_set_vp(nd.ni_vp, uap->attrnamespace, attrname,
uap->data, uap->nbytes, td);
vrele(nd.ni_vp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
/*-
* Get a named extended attribute on a file or directory
*
* Arguments: unlocked vnode "vp", attribute namespace "attrnamespace",
* kernelspace string pointer "attrname", userspace buffer
* pointer "data", buffer length "nbytes", thread "td".
* Returns: 0 on success, an error number otherwise
* Locks: none
* References: vp must be a valid reference for the duration of the call
*/
static int
extattr_get_vp(struct vnode *vp, int attrnamespace, const char *attrname,
void *data, size_t nbytes, struct thread *td)
{
struct uio auio, *auiop;
struct iovec aiov;
ssize_t cnt;
size_t size, *sizep;
int error;
VFS_ASSERT_GIANT(vp->v_mount);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
/*
* Slightly unusual semantics: if the user provides a NULL data
* pointer, they don't want to receive the data, just the maximum
* read length.
*/
auiop = NULL;
sizep = NULL;
cnt = 0;
if (data != NULL) {
aiov.iov_base = data;
aiov.iov_len = nbytes;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
if (nbytes > IOSIZE_MAX) {
error = EINVAL;
goto done;
}
auio.uio_resid = nbytes;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
auiop = &auio;
cnt = nbytes;
} else
sizep = &size;
#ifdef MAC
error = mac_vnode_check_getextattr(td->td_ucred, vp, attrnamespace,
attrname);
if (error)
goto done;
#endif
error = VOP_GETEXTATTR(vp, attrnamespace, attrname, auiop, sizep,
td->td_ucred, td);
if (auiop != NULL) {
cnt -= auio.uio_resid;
td->td_retval[0] = cnt;
} else
td->td_retval[0] = size;
done:
VOP_UNLOCK(vp, 0);
return (error);
}
int
sys_extattr_get_fd(td, uap)
struct thread *td;
struct extattr_get_fd_args /* {
int fd;
int attrnamespace;
const char *attrname;
void *data;
size_t nbytes;
} */ *uap;
{
struct file *fp;
char attrname[EXTATTR_MAXNAMELEN];
int vfslocked, error;
AUDIT_ARG_FD(uap->fd);
AUDIT_ARG_VALUE(uap->attrnamespace);
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
AUDIT_ARG_TEXT(attrname);
error = getvnode(td->td_proc->p_fd, uap->fd, CAP_EXTATTR_GET, &fp);
if (error)
return (error);
vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
error = extattr_get_vp(fp->f_vnode, uap->attrnamespace,
attrname, uap->data, uap->nbytes, td);
fdrop(fp, td);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
int
sys_extattr_get_file(td, uap)
struct thread *td;
struct extattr_get_file_args /* {
const char *path;
int attrnamespace;
const char *attrname;
void *data;
size_t nbytes;
} */ *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int vfslocked, error;
AUDIT_ARG_VALUE(uap->attrnamespace);
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
AUDIT_ARG_TEXT(attrname);
NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW | AUDITVNODE1, UIO_USERSPACE,
uap->path, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vfslocked = NDHASGIANT(&nd);
error = extattr_get_vp(nd.ni_vp, uap->attrnamespace, attrname,
uap->data, uap->nbytes, td);
vrele(nd.ni_vp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
int
sys_extattr_get_link(td, uap)
struct thread *td;
struct extattr_get_link_args /* {
const char *path;
int attrnamespace;
const char *attrname;
void *data;
size_t nbytes;
} */ *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int vfslocked, error;
AUDIT_ARG_VALUE(uap->attrnamespace);
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
AUDIT_ARG_TEXT(attrname);
NDINIT(&nd, LOOKUP, MPSAFE | NOFOLLOW | AUDITVNODE1, UIO_USERSPACE,
uap->path, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vfslocked = NDHASGIANT(&nd);
error = extattr_get_vp(nd.ni_vp, uap->attrnamespace, attrname,
uap->data, uap->nbytes, td);
vrele(nd.ni_vp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
/*
* extattr_delete_vp(): Delete a named extended attribute on a file or
* directory
*
* Arguments: unlocked vnode "vp", attribute namespace "attrnamespace",
* kernelspace string pointer "attrname", proc "p"
* Returns: 0 on success, an error number otherwise
* Locks: none
* References: vp must be a valid reference for the duration of the call
*/
static int
extattr_delete_vp(struct vnode *vp, int attrnamespace, const char *attrname,
struct thread *td)
{
struct mount *mp;
int error;
VFS_ASSERT_GIANT(vp->v_mount);
error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
if (error)
return (error);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
#ifdef MAC
error = mac_vnode_check_deleteextattr(td->td_ucred, vp, attrnamespace,
attrname);
if (error)
goto done;
#endif
error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, td->td_ucred,
td);
if (error == EOPNOTSUPP)
error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL,
td->td_ucred, td);
#ifdef MAC
done:
#endif
VOP_UNLOCK(vp, 0);
vn_finished_write(mp);
return (error);
}
int
sys_extattr_delete_fd(td, uap)
struct thread *td;
struct extattr_delete_fd_args /* {
int fd;
int attrnamespace;
const char *attrname;
} */ *uap;
{
struct file *fp;
char attrname[EXTATTR_MAXNAMELEN];
int vfslocked, error;
AUDIT_ARG_FD(uap->fd);
AUDIT_ARG_VALUE(uap->attrnamespace);
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
AUDIT_ARG_TEXT(attrname);
error = getvnode(td->td_proc->p_fd, uap->fd, CAP_EXTATTR_DELETE,
&fp);
if (error)
return (error);
vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
error = extattr_delete_vp(fp->f_vnode, uap->attrnamespace,
attrname, td);
fdrop(fp, td);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
int
sys_extattr_delete_file(td, uap)
struct thread *td;
struct extattr_delete_file_args /* {
const char *path;
int attrnamespace;
const char *attrname;
} */ *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int vfslocked, error;
AUDIT_ARG_VALUE(uap->attrnamespace);
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return(error);
AUDIT_ARG_TEXT(attrname);
NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW | AUDITVNODE1, UIO_USERSPACE,
uap->path, td);
error = namei(&nd);
if (error)
return(error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vfslocked = NDHASGIANT(&nd);
error = extattr_delete_vp(nd.ni_vp, uap->attrnamespace, attrname, td);
vrele(nd.ni_vp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
int
sys_extattr_delete_link(td, uap)
struct thread *td;
struct extattr_delete_link_args /* {
const char *path;
int attrnamespace;
const char *attrname;
} */ *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int vfslocked, error;
AUDIT_ARG_VALUE(uap->attrnamespace);
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return(error);
AUDIT_ARG_TEXT(attrname);
NDINIT(&nd, LOOKUP, MPSAFE | NOFOLLOW | AUDITVNODE1, UIO_USERSPACE,
uap->path, td);
error = namei(&nd);
if (error)
return(error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vfslocked = NDHASGIANT(&nd);
error = extattr_delete_vp(nd.ni_vp, uap->attrnamespace, attrname, td);
vrele(nd.ni_vp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*-
* Retrieve a list of extended attributes on a file or directory.
*
* Arguments: unlocked vnode "vp", attribute namespace 'attrnamespace",
* userspace buffer pointer "data", buffer length "nbytes",
* thread "td".
* Returns: 0 on success, an error number otherwise
* Locks: none
* References: vp must be a valid reference for the duration of the call
*/
static int
extattr_list_vp(struct vnode *vp, int attrnamespace, void *data,
size_t nbytes, struct thread *td)
{
struct uio auio, *auiop;
size_t size, *sizep;
struct iovec aiov;
ssize_t cnt;
int error;
VFS_ASSERT_GIANT(vp->v_mount);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
auiop = NULL;
sizep = NULL;
cnt = 0;
if (data != NULL) {
aiov.iov_base = data;
aiov.iov_len = nbytes;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
if (nbytes > IOSIZE_MAX) {
error = EINVAL;
goto done;
}
auio.uio_resid = nbytes;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
auiop = &auio;
cnt = nbytes;
} else
sizep = &size;
#ifdef MAC
error = mac_vnode_check_listextattr(td->td_ucred, vp, attrnamespace);
if (error)
goto done;
#endif
error = VOP_LISTEXTATTR(vp, attrnamespace, auiop, sizep,
td->td_ucred, td);
if (auiop != NULL) {
cnt -= auio.uio_resid;
td->td_retval[0] = cnt;
} else
td->td_retval[0] = size;
done:
VOP_UNLOCK(vp, 0);
return (error);
}
int
sys_extattr_list_fd(td, uap)
struct thread *td;
struct extattr_list_fd_args /* {
int fd;
int attrnamespace;
void *data;
size_t nbytes;
} */ *uap;
{
struct file *fp;
int vfslocked, error;
AUDIT_ARG_FD(uap->fd);
AUDIT_ARG_VALUE(uap->attrnamespace);
error = getvnode(td->td_proc->p_fd, uap->fd, CAP_EXTATTR_LIST, &fp);
if (error)
return (error);
vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
error = extattr_list_vp(fp->f_vnode, uap->attrnamespace, uap->data,
uap->nbytes, td);
fdrop(fp, td);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
int
sys_extattr_list_file(td, uap)
struct thread*td;
struct extattr_list_file_args /* {
const char *path;
int attrnamespace;
void *data;
size_t nbytes;
} */ *uap;
{
struct nameidata nd;
int vfslocked, error;
AUDIT_ARG_VALUE(uap->attrnamespace);
NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW | AUDITVNODE1, UIO_USERSPACE,
uap->path, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vfslocked = NDHASGIANT(&nd);
error = extattr_list_vp(nd.ni_vp, uap->attrnamespace, uap->data,
uap->nbytes, td);
vrele(nd.ni_vp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
int
sys_extattr_list_link(td, uap)
struct thread*td;
struct extattr_list_link_args /* {
const char *path;
int attrnamespace;
void *data;
size_t nbytes;
} */ *uap;
{
struct nameidata nd;
int vfslocked, error;
AUDIT_ARG_VALUE(uap->attrnamespace);
NDINIT(&nd, LOOKUP, MPSAFE | NOFOLLOW | AUDITVNODE1, UIO_USERSPACE,
uap->path, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vfslocked = NDHASGIANT(&nd);
error = extattr_list_vp(nd.ni_vp, uap->attrnamespace, uap->data,
uap->nbytes, td);
vrele(nd.ni_vp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}