From: Christoph Hellwig Date: Thu, 27 Feb 2020 01:30:41 +0000 (-0800) Subject: xfs: lift cursor copy in/out into xfs_ioc_attr_list X-Git-Tag: v5.10.7~2829^2~97 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=53ac39fdb301e022a4ba477ee114cdab56045ac9;p=platform%2Fkernel%2Flinux-rpi.git xfs: lift cursor copy in/out into xfs_ioc_attr_list 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 Reviewed-by: Dave Chinner Reviewed-by: Chandan Rajendra Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong --- diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 34f5969..2a7d059 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -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 @@ out_free: 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; } diff --git a/fs/xfs/xfs_ioctl.h b/fs/xfs/xfs_ioctl.h index ec6448b..d6e8000 100644 --- a/fs/xfs/xfs_ioctl.h +++ b/fs/xfs/xfs_ioctl.h @@ -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( diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c index 17e1491..c1771e7 100644 --- a/fs/xfs/xfs_ioctl32.c +++ b/fs/xfs/xfs_ioctl32.c @@ -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; }