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xfs: lift cursor copy in/out into xfs_ioc_attr_list

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Lift the common code to copy the cursor from and to user space into
xfs_ioc_attr_list.  Note that this means we copy in twice now as
the cursor is in the middle of the conaining structure, but we never
touch the memory for the original copy.  Doing so keeps the cursor
handling isolated in the common helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Chandan Rajendra <chandanrlinux@gmail.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2020-02-26 17:30:41 -08:00 committed by Darrick J. Wong
parent eb241c7474
commit 53ac39fdb3
3 changed files with 20 additions and 37 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

36
fs/xfs/xfs_ioctl.c
View file

@ -355,9 +355,10 @@ xfs_ioc_attr_list(
void __user *ubuf,
int bufsize,
int flags,
struct attrlist_cursor_kern *cursor)
struct xfs_attrlist_cursor __user *ucursor)
{
struct xfs_attr_list_context context;
struct attrlist_cursor_kern cursor;
struct xfs_attrlist *alist;
void *buffer;
int error;
@ -377,10 +378,12 @@ xfs_ioc_attr_list(
/*
* Validate the cursor.
*/
if (cursor->pad1 || cursor->pad2)
if (copy_from_user(&cursor, ucursor, sizeof(cursor)))
return -EFAULT;
if (cursor.pad1 || cursor.pad2)
return -EINVAL;
if ((cursor->initted == 0) &&
(cursor->hashval || cursor->blkno || cursor->offset))
if ((cursor.initted == 0) &&
(cursor.hashval || cursor.blkno || cursor.offset))
return -EINVAL;
buffer = kmem_zalloc_large(bufsize, 0);
@ -392,7 +395,7 @@ xfs_ioc_attr_list(
*/
memset(&context, 0, sizeof(context));
context.dp = dp;
context.cursor = cursor;
context.cursor = &cursor;
context.resynch = 1;
context.flags = flags;
context.buffer = buffer;
@ -409,7 +412,8 @@ xfs_ioc_attr_list(
if (error)
goto out_free;
if (copy_to_user(ubuf, buffer, bufsize))
if (copy_to_user(ubuf, buffer, bufsize) ||
copy_to_user(ucursor, &cursor, sizeof(cursor)))
error = -EFAULT;
out_free:
kmem_free(buffer);
@ -419,33 +423,23 @@ xfs_ioc_attr_list(
STATIC int
xfs_attrlist_by_handle(
struct file *parfilp,
void __user *arg)
struct xfs_fsop_attrlist_handlereq __user *p)
{
int error = -ENOMEM;
attrlist_cursor_kern_t *cursor;
struct xfs_fsop_attrlist_handlereq __user *p = arg;
xfs_fsop_attrlist_handlereq_t al_hreq;
struct xfs_fsop_attrlist_handlereq al_hreq;
struct dentry *dentry;
int error = -ENOMEM;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&al_hreq, arg, sizeof(xfs_fsop_attrlist_handlereq_t)))
if (copy_from_user(&al_hreq, p, sizeof(al_hreq)))
return -EFAULT;
dentry = xfs_handlereq_to_dentry(parfilp, &al_hreq.hreq);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
error = xfs_ioc_attr_list(XFS_I(d_inode(dentry)), al_hreq.buffer,
al_hreq.buflen, al_hreq.flags, cursor);
if (error)
goto out_dput;
if (copy_to_user(&p->pos, cursor, sizeof(attrlist_cursor_kern_t)))
error = -EFAULT;
out_dput:
al_hreq.buflen, al_hreq.flags, &p->pos);
dput(dentry);
return error;
}

2
fs/xfs/xfs_ioctl.h
View file

@ -40,7 +40,7 @@ int xfs_ioc_attrmulti_one(struct file *parfilp, struct inode *inode,
uint32_t opcode, void __user *uname, void __user *value,
uint32_t *len, uint32_t flags);
int xfs_ioc_attr_list(struct xfs_inode *dp, void __user *ubuf, int bufsize,
int flags, struct attrlist_cursor_kern *cursor);
int flags, struct xfs_attrlist_cursor __user *ucursor);
extern struct dentry *
xfs_handle_to_dentry(

19
fs/xfs/xfs_ioctl32.c
View file

@ -352,35 +352,24 @@ xfs_compat_handlereq_to_dentry(
STATIC int
xfs_compat_attrlist_by_handle(
struct file *parfilp,
void __user *arg)
compat_xfs_fsop_attrlist_handlereq_t __user *p)
{
int error;
attrlist_cursor_kern_t *cursor;
compat_xfs_fsop_attrlist_handlereq_t __user *p = arg;
compat_xfs_fsop_attrlist_handlereq_t al_hreq;
struct dentry *dentry;
int error;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&al_hreq, arg,
sizeof(compat_xfs_fsop_attrlist_handlereq_t)))
if (copy_from_user(&al_hreq, p, sizeof(al_hreq)))
return -EFAULT;
dentry = xfs_compat_handlereq_to_dentry(parfilp, &al_hreq.hreq);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
error = xfs_ioc_attr_list(XFS_I(d_inode(dentry)),
compat_ptr(al_hreq.buffer), al_hreq.buflen,
al_hreq.flags, cursor);
if (error)
goto out_dput;
if (copy_to_user(&p->pos, cursor, sizeof(attrlist_cursor_kern_t)))
error = -EFAULT;
out_dput:
al_hreq.flags, &p->pos);
dput(dentry);
return error;
}