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 18 struct 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 27 struct io_unlink { 28 struct file *file; 29 int dfd; 30 int flags; 31 struct filename *filename; 32 }; 33 34 struct io_mkdir { 35 struct file *file; 36 int dfd; 37 umode_t mode; 38 struct filename *filename; 39 }; 40 41 struct 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 50 int 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 80 int 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 96 void 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 } 103 104 int 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 } 128 129 int 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 } 146 147 void 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 } 153 154 int 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 } 175 176 int 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 } 190 191 void 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 } 197 198 int 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 } 225 226 int 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 } 240 241 int 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 } 270 271 int 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 } 286 287 void 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 } 294