1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/kernel.h>
  3#include <linux/errno.h>
  4#include <linux/fs.h>
  5#include <linux/file.h>
  6#include <linux/mm.h>
  7#include <linux/slab.h>
  8#include <linux/namei.h>
  9#include <linux/io_uring.h>
 10
 11#include <uapi/linux/io_uring.h>
 12
 13#include "../fs/internal.h"
 14
 15#include "io_uring.h"
 16#include "fs.h"
 17
 18struct io_rename {
 19	struct file			*file;
 20	int				old_dfd;
 21	int				new_dfd;
 22	struct filename			*oldpath;
 23	struct filename			*newpath;
 24	int				flags;
 25};
 26
 27struct io_unlink {
 28	struct file			*file;
 29	int				dfd;
 30	int				flags;
 31	struct filename			*filename;
 32};
 33
 34struct io_mkdir {
 35	struct file			*file;
 36	int				dfd;
 37	umode_t				mode;
 38	struct filename			*filename;
 39};
 40
 41struct io_link {
 42	struct file			*file;
 43	int				old_dfd;
 44	int				new_dfd;
 45	struct filename			*oldpath;
 46	struct filename			*newpath;
 47	int				flags;
 48};
 49
 50int io_renameat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 51{
 52	struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
 53	const char __user *oldf, *newf;
 54
 55	if (sqe->buf_index || sqe->splice_fd_in)
 56		return -EINVAL;
 57	if (unlikely(req->flags & REQ_F_FIXED_FILE))
 58		return -EBADF;
 59
 60	ren->old_dfd = READ_ONCE(sqe->fd);
 61	oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
 62	newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
 63	ren->new_dfd = READ_ONCE(sqe->len);
 64	ren->flags = READ_ONCE(sqe->rename_flags);
 65
 66	ren->oldpath = getname(oldf);
 67	if (IS_ERR(ren->oldpath))
 68		return PTR_ERR(ren->oldpath);
 69
 70	ren->newpath = getname(newf);
 71	if (IS_ERR(ren->newpath)) {
 72		putname(ren->oldpath);
 73		return PTR_ERR(ren->newpath);
 74	}
 75
 76	req->flags |= REQ_F_NEED_CLEANUP;
 77	return 0;
 78}
 79
 80int io_renameat(struct io_kiocb *req, unsigned int issue_flags)
 81{
 82	struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
 83	int ret;
 84
 85	if (issue_flags & IO_URING_F_NONBLOCK)
 86		return -EAGAIN;
 87
 88	ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd,
 89				ren->newpath, ren->flags);
 90
 91	req->flags &= ~REQ_F_NEED_CLEANUP;
 92	io_req_set_res(req, ret, 0);
 93	return IOU_OK;
 94}
 95
 96void io_renameat_cleanup(struct io_kiocb *req)
 97{
 98	struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
 99
100	putname(ren->oldpath);
101	putname(ren->newpath);
102}
103
104int io_unlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
105{
106	struct io_unlink *un = io_kiocb_to_cmd(req, struct io_unlink);
107	const char __user *fname;
108
109	if (sqe->off || sqe->len || sqe->buf_index || sqe->splice_fd_in)
110		return -EINVAL;
111	if (unlikely(req->flags & REQ_F_FIXED_FILE))
112		return -EBADF;
113
114	un->dfd = READ_ONCE(sqe->fd);
115
116	un->flags = READ_ONCE(sqe->unlink_flags);
117	if (un->flags & ~AT_REMOVEDIR)
118		return -EINVAL;
119
120	fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
121	un->filename = getname(fname);
122	if (IS_ERR(un->filename))
123		return PTR_ERR(un->filename);
124
125	req->flags |= REQ_F_NEED_CLEANUP;
126	return 0;
127}
128
129int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags)
130{
131	struct io_unlink *un = io_kiocb_to_cmd(req, struct io_unlink);
132	int ret;
133
134	if (issue_flags & IO_URING_F_NONBLOCK)
135		return -EAGAIN;
136
137	if (un->flags & AT_REMOVEDIR)
138		ret = do_rmdir(un->dfd, un->filename);
139	else
140		ret = do_unlinkat(un->dfd, un->filename);
141
142	req->flags &= ~REQ_F_NEED_CLEANUP;
143	io_req_set_res(req, ret, 0);
144	return IOU_OK;
145}
146
147void io_unlinkat_cleanup(struct io_kiocb *req)
148{
149	struct io_unlink *ul = io_kiocb_to_cmd(req, struct io_unlink);
150
151	putname(ul->filename);
152}
153
154int io_mkdirat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
155{
156	struct io_mkdir *mkd = io_kiocb_to_cmd(req, struct io_mkdir);
157	const char __user *fname;
158
159	if (sqe->off || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
160		return -EINVAL;
161	if (unlikely(req->flags & REQ_F_FIXED_FILE))
162		return -EBADF;
163
164	mkd->dfd = READ_ONCE(sqe->fd);
165	mkd->mode = READ_ONCE(sqe->len);
166
167	fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
168	mkd->filename = getname(fname);
169	if (IS_ERR(mkd->filename))
170		return PTR_ERR(mkd->filename);
171
172	req->flags |= REQ_F_NEED_CLEANUP;
173	return 0;
174}
175
176int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags)
177{
178	struct io_mkdir *mkd = io_kiocb_to_cmd(req, struct io_mkdir);
179	int ret;
180
181	if (issue_flags & IO_URING_F_NONBLOCK)
182		return -EAGAIN;
183
184	ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode);
185
186	req->flags &= ~REQ_F_NEED_CLEANUP;
187	io_req_set_res(req, ret, 0);
188	return IOU_OK;
189}
190
191void io_mkdirat_cleanup(struct io_kiocb *req)
192{
193	struct io_mkdir *md = io_kiocb_to_cmd(req, struct io_mkdir);
194
195	putname(md->filename);
196}
197
198int io_symlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
199{
200	struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
201	const char __user *oldpath, *newpath;
202
203	if (sqe->len || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
204		return -EINVAL;
205	if (unlikely(req->flags & REQ_F_FIXED_FILE))
206		return -EBADF;
207
208	sl->new_dfd = READ_ONCE(sqe->fd);
209	oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr));
210	newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2));
211
212	sl->oldpath = getname(oldpath);
213	if (IS_ERR(sl->oldpath))
214		return PTR_ERR(sl->oldpath);
215
216	sl->newpath = getname(newpath);
217	if (IS_ERR(sl->newpath)) {
218		putname(sl->oldpath);
219		return PTR_ERR(sl->newpath);
220	}
221
222	req->flags |= REQ_F_NEED_CLEANUP;
223	return 0;
224}
225
226int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags)
227{
228	struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
229	int ret;
230
231	if (issue_flags & IO_URING_F_NONBLOCK)
232		return -EAGAIN;
233
234	ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath);
235
236	req->flags &= ~REQ_F_NEED_CLEANUP;
237	io_req_set_res(req, ret, 0);
238	return IOU_OK;
239}
240
241int io_linkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
242{
243	struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
244	const char __user *oldf, *newf;
245
246	if (sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
247		return -EINVAL;
248	if (unlikely(req->flags & REQ_F_FIXED_FILE))
249		return -EBADF;
250
251	lnk->old_dfd = READ_ONCE(sqe->fd);
252	lnk->new_dfd = READ_ONCE(sqe->len);
253	oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
254	newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
255	lnk->flags = READ_ONCE(sqe->hardlink_flags);
256
257	lnk->oldpath = getname(oldf);
258	if (IS_ERR(lnk->oldpath))
259		return PTR_ERR(lnk->oldpath);
260
261	lnk->newpath = getname(newf);
262	if (IS_ERR(lnk->newpath)) {
263		putname(lnk->oldpath);
264		return PTR_ERR(lnk->newpath);
265	}
266
267	req->flags |= REQ_F_NEED_CLEANUP;
268	return 0;
269}
270
271int io_linkat(struct io_kiocb *req, unsigned int issue_flags)
272{
273	struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
274	int ret;
275
276	if (issue_flags & IO_URING_F_NONBLOCK)
277		return -EAGAIN;
278
279	ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd,
280				lnk->newpath, lnk->flags);
281
282	req->flags &= ~REQ_F_NEED_CLEANUP;
283	io_req_set_res(req, ret, 0);
284	return IOU_OK;
285}
286
287void io_link_cleanup(struct io_kiocb *req)
288{
289	struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
290
291	putname(sl->oldpath);
292	putname(sl->newpath);
293}