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[XFS] Move copy_from_user calls out of ioctl helpers into ioctl switch.

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Moving the copy_from_user out of some of the ioctl helpers will
make it easier for the compat ioctl switch to copy in the right
struct, then just pass to the underlying helper.

Also, move common access checks into the helpers themselves,
and out of the native ioctl switch code, to reduce code
duplication between native & compat ioctl callers.

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
This commit is contained in:
sandeen@sandeen.net 2008-11-25 21:20:06 -06:00 committed by Lachlan McIlroy
parent 0e446673a1
commit 743bb4650d
5 changed files with 63 additions and 64 deletions
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109
fs/xfs/linux-2.6/xfs_ioctl.c
View file

@ -71,23 +71,19 @@
STATIC int
xfs_find_handle(
unsigned int cmd,
void __user *arg)
xfs_fsop_handlereq_t *hreq)
{
int hsize;
xfs_handle_t handle;
xfs_fsop_handlereq_t hreq;
struct inode *inode;
if (copy_from_user(&hreq, arg, sizeof(hreq)))
return -XFS_ERROR(EFAULT);
memset((char *)&handle, 0, sizeof(handle));
switch (cmd) {
case XFS_IOC_PATH_TO_FSHANDLE:
case XFS_IOC_PATH_TO_HANDLE: {
struct path path;
int error = user_lpath((const char __user *)hreq.path, &path);
int error = user_lpath((const char __user *)hreq->path, &path);
if (error)
return error;
@ -101,7 +97,7 @@ xfs_find_handle(
case XFS_IOC_FD_TO_HANDLE: {
struct file *file;
file = fget(hreq.fd);
file = fget(hreq->fd);
if (!file)
return -EBADF;
@ -158,8 +154,8 @@ xfs_find_handle(
}
/* now copy our handle into the user buffer & write out the size */
if (copy_to_user(hreq.ohandle, &handle, hsize) ||
copy_to_user(hreq.ohandlen, &hsize, sizeof(__s32))) {
if (copy_to_user(hreq->ohandle, &handle, hsize) ||
copy_to_user(hreq->ohandlen, &hsize, sizeof(__s32))) {
iput(inode);
return -XFS_ERROR(EFAULT);
}
@ -252,7 +248,7 @@ xfs_vget_fsop_handlereq(
STATIC int
xfs_open_by_handle(
xfs_mount_t *mp,
void __user *arg,
xfs_fsop_handlereq_t *hreq,
struct file *parfilp,
struct inode *parinode)
{
@ -262,14 +258,11 @@ xfs_open_by_handle(
struct file *filp;
struct inode *inode;
struct dentry *dentry;
xfs_fsop_handlereq_t hreq;
if (!capable(CAP_SYS_ADMIN))
return -XFS_ERROR(EPERM);
if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
return -XFS_ERROR(EFAULT);
error = xfs_vget_fsop_handlereq(mp, parinode, &hreq, &inode);
error = xfs_vget_fsop_handlereq(mp, parinode, hreq, &inode);
if (error)
return -error;
@ -280,10 +273,10 @@ xfs_open_by_handle(
}
#if BITS_PER_LONG != 32
hreq.oflags |= O_LARGEFILE;
hreq->oflags |= O_LARGEFILE;
#endif
/* Put open permission in namei format. */
permflag = hreq.oflags;
permflag = hreq->oflags;
if ((permflag+1) & O_ACCMODE)
permflag++;
if (permflag & O_TRUNC)
@ -321,7 +314,7 @@ xfs_open_by_handle(
mntget(parfilp->f_path.mnt);
/* Create file pointer. */
filp = dentry_open(dentry, parfilp->f_path.mnt, hreq.oflags);
filp = dentry_open(dentry, parfilp->f_path.mnt, hreq->oflags);
if (IS_ERR(filp)) {
put_unused_fd(new_fd);
return -XFS_ERROR(-PTR_ERR(filp));
@ -365,21 +358,18 @@ do_readlink(
STATIC int
xfs_readlink_by_handle(
xfs_mount_t *mp,
void __user *arg,
xfs_fsop_handlereq_t *hreq,
struct inode *parinode)
{
struct inode *inode;
xfs_fsop_handlereq_t hreq;
__u32 olen;
void *link;
int error;
if (!capable(CAP_SYS_ADMIN))
return -XFS_ERROR(EPERM);
if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
return -XFS_ERROR(EFAULT);
error = xfs_vget_fsop_handlereq(mp, parinode, &hreq, &inode);
error = xfs_vget_fsop_handlereq(mp, parinode, hreq, &inode);
if (error)
return -error;
@ -389,7 +379,7 @@ xfs_readlink_by_handle(
goto out_iput;
}
if (copy_from_user(&olen, hreq.ohandlen, sizeof(__u32))) {
if (copy_from_user(&olen, hreq->ohandlen, sizeof(__u32))) {
error = -XFS_ERROR(EFAULT);
goto out_iput;
}
@ -401,7 +391,7 @@ xfs_readlink_by_handle(
error = -xfs_readlink(XFS_I(inode), link);
if (error)
goto out_kfree;
error = do_readlink(hreq.ohandle, olen, link);
error = do_readlink(hreq->ohandle, olen, link);
if (error)
goto out_kfree;
@ -668,12 +658,19 @@ xfs_ioc_space(
struct file *filp,
int ioflags,
unsigned int cmd,
void __user *arg)
xfs_flock64_t *bf)
{
xfs_flock64_t bf;
int attr_flags = 0;
int error;
/*
* Only allow the sys admin to reserve space unless
* unwritten extents are enabled.
*/
if (!xfs_sb_version_hasextflgbit(&ip->i_mount->m_sb) &&
!capable(CAP_SYS_ADMIN))
return -XFS_ERROR(EPERM);
if (inode->i_flags & (S_IMMUTABLE|S_APPEND))
return -XFS_ERROR(EPERM);
@ -683,15 +680,12 @@ xfs_ioc_space(
if (!S_ISREG(inode->i_mode))
return -XFS_ERROR(EINVAL);
if (copy_from_user(&bf, arg, sizeof(bf)))
return -XFS_ERROR(EFAULT);
if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
attr_flags |= XFS_ATTR_NONBLOCK;
if (ioflags & IO_INVIS)
attr_flags |= XFS_ATTR_DMI;
error = xfs_change_file_space(ip, cmd, &bf, filp->f_pos, attr_flags);
error = xfs_change_file_space(ip, cmd, bf, filp->f_pos, attr_flags);
return -error;
}
@ -1356,17 +1350,13 @@ xfs_ioctl(
case XFS_IOC_ALLOCSP64:
case XFS_IOC_FREESP64:
case XFS_IOC_RESVSP64:
case XFS_IOC_UNRESVSP64:
/*
* Only allow the sys admin to reserve space unless
* unwritten extents are enabled.
*/
if (!xfs_sb_version_hasextflgbit(&mp->m_sb) &&
!capable(CAP_SYS_ADMIN))
return -EPERM;
return xfs_ioc_space(ip, inode, filp, ioflags, cmd, arg);
case XFS_IOC_UNRESVSP64: {
xfs_flock64_t bf;
if (copy_from_user(&bf, arg, sizeof(bf)))
return -XFS_ERROR(EFAULT);
return xfs_ioc_space(ip, inode, filp, ioflags, cmd, &bf);
}
case XFS_IOC_DIOINFO: {
struct dioattr da;
xfs_buftarg_t *target =
@ -1426,18 +1416,30 @@ xfs_ioctl(
case XFS_IOC_FD_TO_HANDLE:
case XFS_IOC_PATH_TO_HANDLE:
case XFS_IOC_PATH_TO_FSHANDLE:
return xfs_find_handle(cmd, arg);
case XFS_IOC_PATH_TO_FSHANDLE: {
xfs_fsop_handlereq_t hreq;
case XFS_IOC_OPEN_BY_HANDLE:
return xfs_open_by_handle(mp, arg, filp, inode);
if (copy_from_user(&hreq, arg, sizeof(hreq)))
return -XFS_ERROR(EFAULT);
return xfs_find_handle(cmd, &hreq);
}
case XFS_IOC_OPEN_BY_HANDLE: {
xfs_fsop_handlereq_t hreq;
if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
return -XFS_ERROR(EFAULT);
return xfs_open_by_handle(mp, &hreq, filp, inode);
}
case XFS_IOC_FSSETDM_BY_HANDLE:
return xfs_fssetdm_by_handle(mp, arg, inode);
case XFS_IOC_READLINK_BY_HANDLE:
return xfs_readlink_by_handle(mp, arg, inode);
case XFS_IOC_READLINK_BY_HANDLE: {
xfs_fsop_handlereq_t hreq;
if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
return -XFS_ERROR(EFAULT);
return xfs_readlink_by_handle(mp, &hreq, inode);
}
case XFS_IOC_ATTRLIST_BY_HANDLE:
return xfs_attrlist_by_handle(mp, arg, inode);
@ -1445,7 +1447,11 @@ xfs_ioctl(
return xfs_attrmulti_by_handle(mp, arg, filp, inode);
case XFS_IOC_SWAPEXT: {
error = xfs_swapext((struct xfs_swapext __user *)arg);
struct xfs_swapext sxp;
if (copy_from_user(&sxp, arg, sizeof(xfs_swapext_t)))
return -XFS_ERROR(EFAULT);
error = xfs_swapext(&sxp);
return -error;
}
@ -1501,9 +1507,6 @@ xfs_ioctl(
case XFS_IOC_FSGROWFSDATA: {
xfs_growfs_data_t in;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&in, arg, sizeof(in)))
return -XFS_ERROR(EFAULT);
@ -1514,9 +1517,6 @@ xfs_ioctl(
case XFS_IOC_FSGROWFSLOG: {
xfs_growfs_log_t in;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&in, arg, sizeof(in)))
return -XFS_ERROR(EFAULT);
@ -1527,9 +1527,6 @@ xfs_ioctl(
case XFS_IOC_FSGROWFSRT: {
xfs_growfs_rt_t in;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&in, arg, sizeof(in)))
return -XFS_ERROR(EFAULT);

8
fs/xfs/xfs_dfrag.c
View file

@ -49,9 +49,8 @@
*/
int
xfs_swapext(
xfs_swapext_t __user *sxu)
xfs_swapext_t *sxp)
{
xfs_swapext_t *sxp;
xfs_inode_t *ip, *tip;
struct file *file, *target_file;
int error = 0;
@ -62,11 +61,6 @@ xfs_swapext(
goto out;
}
if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) {
error = XFS_ERROR(EFAULT);
goto out_free_sxp;
}
/* Pull information for the target fd */
file = fget((int)sxp->sx_fdtarget);
if (!file) {

2
fs/xfs/xfs_dfrag.h
View file

@ -46,7 +46,7 @@ typedef struct xfs_swapext
/*
* Syscall interface for xfs_swapext
*/
int xfs_swapext(struct xfs_swapext __user *sx);
int xfs_swapext(struct xfs_swapext *sx);
int xfs_swap_extents(struct xfs_inode *ip, struct xfs_inode *tip,
struct xfs_swapext *sxp);

6
fs/xfs/xfs_fsops.c
View file

@ -435,6 +435,9 @@ xfs_growfs_data(
xfs_growfs_data_t *in)
{
int error;
if (!capable(CAP_SYS_ADMIN))
return XFS_ERROR(EPERM);
if (!mutex_trylock(&mp->m_growlock))
return XFS_ERROR(EWOULDBLOCK);
error = xfs_growfs_data_private(mp, in);
@ -448,6 +451,9 @@ xfs_growfs_log(
xfs_growfs_log_t *in)
{
int error;
if (!capable(CAP_SYS_ADMIN))
return XFS_ERROR(EPERM);
if (!mutex_trylock(&mp->m_growlock))
return XFS_ERROR(EWOULDBLOCK);
error = xfs_growfs_log_private(mp, in);

2
fs/xfs/xfs_rtalloc.c
View file

@ -1876,6 +1876,8 @@ xfs_growfs_rt(
/*
* Initial error checking.
*/
if (!capable(CAP_SYS_ADMIN))
return XFS_ERROR(EPERM);
if (mp->m_rtdev_targp == NULL || mp->m_rbmip == NULL ||
(nrblocks = in->newblocks) <= sbp->sb_rblocks ||
(sbp->sb_rblocks && (in->extsize != sbp->sb_rextsize)))