Blame view
fs/readdir.c
11.2 KB
b24413180 License cleanup: ... |
1 |
// SPDX-License-Identifier: GPL-2.0 |
1da177e4c Linux-2.6.12-rc2 |
2 3 4 5 6 |
/* * linux/fs/readdir.c * * Copyright (C) 1995 Linus Torvalds */ |
85c9fe8fc vfs: fix warning:... |
7 |
#include <linux/stddef.h> |
022a16924 ROUND_UP macro cl... |
8 |
#include <linux/kernel.h> |
630d9c472 fs: reduce the us... |
9 |
#include <linux/export.h> |
1da177e4c Linux-2.6.12-rc2 |
10 11 12 13 14 |
#include <linux/time.h> #include <linux/mm.h> #include <linux/errno.h> #include <linux/stat.h> #include <linux/file.h> |
1da177e4c Linux-2.6.12-rc2 |
15 |
#include <linux/fs.h> |
d4c7cf6cf fanotify: create ... |
16 |
#include <linux/fsnotify.h> |
1da177e4c Linux-2.6.12-rc2 |
17 18 19 20 |
#include <linux/dirent.h> #include <linux/security.h> #include <linux/syscalls.h> #include <linux/unistd.h> |
0460b2a28 readdir: move com... |
21 |
#include <linux/compat.h> |
1da177e4c Linux-2.6.12-rc2 |
22 |
|
7c0f6ba68 Replace <asm/uacc... |
23 |
#include <linux/uaccess.h> |
1da177e4c Linux-2.6.12-rc2 |
24 |
|
5c0ba4e07 [readdir] introdu... |
25 |
int iterate_dir(struct file *file, struct dir_context *ctx) |
1da177e4c Linux-2.6.12-rc2 |
26 |
{ |
496ad9aa8 new helper: file_... |
27 |
struct inode *inode = file_inode(file); |
619226944 introduce a paral... |
28 |
bool shared = false; |
1da177e4c Linux-2.6.12-rc2 |
29 |
int res = -ENOTDIR; |
619226944 introduce a paral... |
30 31 32 |
if (file->f_op->iterate_shared) shared = true; else if (!file->f_op->iterate) |
1da177e4c Linux-2.6.12-rc2 |
33 34 35 36 37 |
goto out; res = security_file_permission(file, MAY_READ); if (res) goto out; |
002354112 restore killabili... |
38 |
if (shared) { |
619226944 introduce a paral... |
39 |
inode_lock_shared(inode); |
002354112 restore killabili... |
40 41 42 43 44 |
} else { res = down_write_killable(&inode->i_rwsem); if (res) goto out; } |
da7845119 Use mutex_lock_ki... |
45 |
|
1da177e4c Linux-2.6.12-rc2 |
46 47 |
res = -ENOENT; if (!IS_DEADDIR(inode)) { |
2233f31aa [readdir] ->readd... |
48 |
ctx->pos = file->f_pos; |
619226944 introduce a paral... |
49 50 51 52 |
if (shared) res = file->f_op->iterate_shared(file, ctx); else res = file->f_op->iterate(file, ctx); |
2233f31aa [readdir] ->readd... |
53 |
file->f_pos = ctx->pos; |
d4c7cf6cf fanotify: create ... |
54 |
fsnotify_access(file); |
1da177e4c Linux-2.6.12-rc2 |
55 56 |
file_accessed(file); } |
619226944 introduce a paral... |
57 58 59 60 |
if (shared) inode_unlock_shared(inode); else inode_unlock(inode); |
1da177e4c Linux-2.6.12-rc2 |
61 62 63 |
out: return res; } |
5c0ba4e07 [readdir] introdu... |
64 |
EXPORT_SYMBOL(iterate_dir); |
1da177e4c Linux-2.6.12-rc2 |
65 66 67 68 69 70 71 72 73 |
/* * Traditional linux readdir() handling.. * * "count=1" is a special case, meaning that the buffer is one * dirent-structure in size and that the code can't handle more * anyway. Thus the special "fillonedir()" function for that * case (the low-level handlers don't need to care about this). */ |
1da177e4c Linux-2.6.12-rc2 |
74 75 76 77 78 79 80 81 82 83 84 |
#ifdef __ARCH_WANT_OLD_READDIR struct old_linux_dirent { unsigned long d_ino; unsigned long d_offset; unsigned short d_namlen; char d_name[1]; }; struct readdir_callback { |
5c0ba4e07 [readdir] introdu... |
85 |
struct dir_context ctx; |
1da177e4c Linux-2.6.12-rc2 |
86 87 88 |
struct old_linux_dirent __user * dirent; int result; }; |
ac7576f4b vfs: make first a... |
89 90 |
static int fillonedir(struct dir_context *ctx, const char *name, int namlen, loff_t offset, u64 ino, unsigned int d_type) |
1da177e4c Linux-2.6.12-rc2 |
91 |
{ |
ac7576f4b vfs: make first a... |
92 93 |
struct readdir_callback *buf = container_of(ctx, struct readdir_callback, ctx); |
1da177e4c Linux-2.6.12-rc2 |
94 |
struct old_linux_dirent __user * dirent; |
afefdbb28 [PATCH] VFS: Make... |
95 |
unsigned long d_ino; |
1da177e4c Linux-2.6.12-rc2 |
96 97 98 |
if (buf->result) return -EINVAL; |
afefdbb28 [PATCH] VFS: Make... |
99 |
d_ino = ino; |
8f3f655da [PATCH] fix regul... |
100 101 |
if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { buf->result = -EOVERFLOW; |
afefdbb28 [PATCH] VFS: Make... |
102 |
return -EOVERFLOW; |
8f3f655da [PATCH] fix regul... |
103 |
} |
1da177e4c Linux-2.6.12-rc2 |
104 105 106 107 108 109 |
buf->result++; dirent = buf->dirent; if (!access_ok(VERIFY_WRITE, dirent, (unsigned long)(dirent->d_name + namlen + 1) - (unsigned long)dirent)) goto efault; |
afefdbb28 [PATCH] VFS: Make... |
110 |
if ( __put_user(d_ino, &dirent->d_ino) || |
1da177e4c Linux-2.6.12-rc2 |
111 112 113 114 115 116 117 118 119 120 |
__put_user(offset, &dirent->d_offset) || __put_user(namlen, &dirent->d_namlen) || __copy_to_user(dirent->d_name, name, namlen) || __put_user(0, dirent->d_name + namlen)) goto efault; return 0; efault: buf->result = -EFAULT; return -EFAULT; } |
d4e82042c [CVE-2009-0029] S... |
121 122 |
SYSCALL_DEFINE3(old_readdir, unsigned int, fd, struct old_linux_dirent __user *, dirent, unsigned int, count) |
1da177e4c Linux-2.6.12-rc2 |
123 124 |
{ int error; |
63b6df141 give readdir(2)/g... |
125 |
struct fd f = fdget_pos(fd); |
ac6614b76 [readdir] constif... |
126 127 128 129 |
struct readdir_callback buf = { .ctx.actor = fillonedir, .dirent = dirent }; |
1da177e4c Linux-2.6.12-rc2 |
130 |
|
2903ff019 switch simple cas... |
131 |
if (!f.file) |
863ced7fe switch readdir/ge... |
132 |
return -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
133 |
|
5c0ba4e07 [readdir] introdu... |
134 |
error = iterate_dir(f.file, &buf.ctx); |
53c9c5c0e [PATCH] prepare v... |
135 |
if (buf.result) |
1da177e4c Linux-2.6.12-rc2 |
136 |
error = buf.result; |
63b6df141 give readdir(2)/g... |
137 |
fdput_pos(f); |
1da177e4c Linux-2.6.12-rc2 |
138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 |
return error; } #endif /* __ARCH_WANT_OLD_READDIR */ /* * New, all-improved, singing, dancing, iBCS2-compliant getdents() * interface. */ struct linux_dirent { unsigned long d_ino; unsigned long d_off; unsigned short d_reclen; char d_name[1]; }; struct getdents_callback { |
5c0ba4e07 [readdir] introdu... |
155 |
struct dir_context ctx; |
1da177e4c Linux-2.6.12-rc2 |
156 157 158 159 160 |
struct linux_dirent __user * current_dir; struct linux_dirent __user * previous; int count; int error; }; |
ac7576f4b vfs: make first a... |
161 162 |
static int filldir(struct dir_context *ctx, const char *name, int namlen, loff_t offset, u64 ino, unsigned int d_type) |
1da177e4c Linux-2.6.12-rc2 |
163 164 |
{ struct linux_dirent __user * dirent; |
ac7576f4b vfs: make first a... |
165 166 |
struct getdents_callback *buf = container_of(ctx, struct getdents_callback, ctx); |
afefdbb28 [PATCH] VFS: Make... |
167 |
unsigned long d_ino; |
85c9fe8fc vfs: fix warning:... |
168 169 |
int reclen = ALIGN(offsetof(struct linux_dirent, d_name) + namlen + 2, sizeof(long)); |
1da177e4c Linux-2.6.12-rc2 |
170 171 172 173 |
buf->error = -EINVAL; /* only used if we fail.. */ if (reclen > buf->count) return -EINVAL; |
afefdbb28 [PATCH] VFS: Make... |
174 |
d_ino = ino; |
8f3f655da [PATCH] fix regul... |
175 176 |
if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { buf->error = -EOVERFLOW; |
afefdbb28 [PATCH] VFS: Make... |
177 |
return -EOVERFLOW; |
8f3f655da [PATCH] fix regul... |
178 |
} |
1da177e4c Linux-2.6.12-rc2 |
179 180 |
dirent = buf->previous; if (dirent) { |
1f60fbe72 ext4: allow readd... |
181 182 |
if (signal_pending(current)) return -EINTR; |
1da177e4c Linux-2.6.12-rc2 |
183 184 185 186 |
if (__put_user(offset, &dirent->d_off)) goto efault; } dirent = buf->current_dir; |
afefdbb28 [PATCH] VFS: Make... |
187 |
if (__put_user(d_ino, &dirent->d_ino)) |
1da177e4c Linux-2.6.12-rc2 |
188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 |
goto efault; if (__put_user(reclen, &dirent->d_reclen)) goto efault; if (copy_to_user(dirent->d_name, name, namlen)) goto efault; if (__put_user(0, dirent->d_name + namlen)) goto efault; if (__put_user(d_type, (char __user *) dirent + reclen - 1)) goto efault; buf->previous = dirent; dirent = (void __user *)dirent + reclen; buf->current_dir = dirent; buf->count -= reclen; return 0; efault: buf->error = -EFAULT; return -EFAULT; } |
20f37034f [CVE-2009-0029] S... |
206 207 |
SYSCALL_DEFINE3(getdents, unsigned int, fd, struct linux_dirent __user *, dirent, unsigned int, count) |
1da177e4c Linux-2.6.12-rc2 |
208 |
{ |
2903ff019 switch simple cas... |
209 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
210 |
struct linux_dirent __user * lastdirent; |
ac6614b76 [readdir] constif... |
211 212 213 214 215 |
struct getdents_callback buf = { .ctx.actor = filldir, .count = count, .current_dir = dirent }; |
1da177e4c Linux-2.6.12-rc2 |
216 |
int error; |
1da177e4c Linux-2.6.12-rc2 |
217 |
if (!access_ok(VERIFY_WRITE, dirent, count)) |
863ced7fe switch readdir/ge... |
218 |
return -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
219 |
|
63b6df141 give readdir(2)/g... |
220 |
f = fdget_pos(fd); |
2903ff019 switch simple cas... |
221 |
if (!f.file) |
863ced7fe switch readdir/ge... |
222 |
return -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
223 |
|
5c0ba4e07 [readdir] introdu... |
224 |
error = iterate_dir(f.file, &buf.ctx); |
53c9c5c0e [PATCH] prepare v... |
225 226 |
if (error >= 0) error = buf.error; |
1da177e4c Linux-2.6.12-rc2 |
227 228 |
lastdirent = buf.previous; if (lastdirent) { |
bb6f619b3 [readdir] introdu... |
229 |
if (put_user(buf.ctx.pos, &lastdirent->d_off)) |
1da177e4c Linux-2.6.12-rc2 |
230 231 232 233 |
error = -EFAULT; else error = count - buf.count; } |
63b6df141 give readdir(2)/g... |
234 |
fdput_pos(f); |
1da177e4c Linux-2.6.12-rc2 |
235 236 |
return error; } |
1da177e4c Linux-2.6.12-rc2 |
237 |
struct getdents_callback64 { |
5c0ba4e07 [readdir] introdu... |
238 |
struct dir_context ctx; |
1da177e4c Linux-2.6.12-rc2 |
239 240 241 242 243 |
struct linux_dirent64 __user * current_dir; struct linux_dirent64 __user * previous; int count; int error; }; |
ac7576f4b vfs: make first a... |
244 245 |
static int filldir64(struct dir_context *ctx, const char *name, int namlen, loff_t offset, u64 ino, unsigned int d_type) |
1da177e4c Linux-2.6.12-rc2 |
246 247 |
{ struct linux_dirent64 __user *dirent; |
ac7576f4b vfs: make first a... |
248 249 |
struct getdents_callback64 *buf = container_of(ctx, struct getdents_callback64, ctx); |
85c9fe8fc vfs: fix warning:... |
250 251 |
int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1, sizeof(u64)); |
1da177e4c Linux-2.6.12-rc2 |
252 253 254 255 256 257 |
buf->error = -EINVAL; /* only used if we fail.. */ if (reclen > buf->count) return -EINVAL; dirent = buf->previous; if (dirent) { |
1f60fbe72 ext4: allow readd... |
258 259 |
if (signal_pending(current)) return -EINTR; |
1da177e4c Linux-2.6.12-rc2 |
260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 |
if (__put_user(offset, &dirent->d_off)) goto efault; } dirent = buf->current_dir; if (__put_user(ino, &dirent->d_ino)) goto efault; if (__put_user(0, &dirent->d_off)) goto efault; if (__put_user(reclen, &dirent->d_reclen)) goto efault; if (__put_user(d_type, &dirent->d_type)) goto efault; if (copy_to_user(dirent->d_name, name, namlen)) goto efault; if (__put_user(0, dirent->d_name + namlen)) goto efault; buf->previous = dirent; dirent = (void __user *)dirent + reclen; buf->current_dir = dirent; buf->count -= reclen; return 0; efault: buf->error = -EFAULT; return -EFAULT; } |
20f37034f [CVE-2009-0029] S... |
285 286 |
SYSCALL_DEFINE3(getdents64, unsigned int, fd, struct linux_dirent64 __user *, dirent, unsigned int, count) |
1da177e4c Linux-2.6.12-rc2 |
287 |
{ |
2903ff019 switch simple cas... |
288 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
289 |
struct linux_dirent64 __user * lastdirent; |
ac6614b76 [readdir] constif... |
290 291 292 293 294 |
struct getdents_callback64 buf = { .ctx.actor = filldir64, .count = count, .current_dir = dirent }; |
1da177e4c Linux-2.6.12-rc2 |
295 |
int error; |
1da177e4c Linux-2.6.12-rc2 |
296 |
if (!access_ok(VERIFY_WRITE, dirent, count)) |
863ced7fe switch readdir/ge... |
297 |
return -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
298 |
|
63b6df141 give readdir(2)/g... |
299 |
f = fdget_pos(fd); |
2903ff019 switch simple cas... |
300 |
if (!f.file) |
863ced7fe switch readdir/ge... |
301 |
return -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
302 |
|
5c0ba4e07 [readdir] introdu... |
303 |
error = iterate_dir(f.file, &buf.ctx); |
53c9c5c0e [PATCH] prepare v... |
304 305 |
if (error >= 0) error = buf.error; |
1da177e4c Linux-2.6.12-rc2 |
306 307 |
lastdirent = buf.previous; if (lastdirent) { |
bb6f619b3 [readdir] introdu... |
308 |
typeof(lastdirent->d_off) d_off = buf.ctx.pos; |
1da177e4c Linux-2.6.12-rc2 |
309 |
if (__put_user(d_off, &lastdirent->d_off)) |
53c9c5c0e [PATCH] prepare v... |
310 311 312 |
error = -EFAULT; else error = count - buf.count; |
1da177e4c Linux-2.6.12-rc2 |
313 |
} |
63b6df141 give readdir(2)/g... |
314 |
fdput_pos(f); |
1da177e4c Linux-2.6.12-rc2 |
315 316 |
return error; } |
0460b2a28 readdir: move com... |
317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 |
#ifdef CONFIG_COMPAT struct compat_old_linux_dirent { compat_ulong_t d_ino; compat_ulong_t d_offset; unsigned short d_namlen; char d_name[1]; }; struct compat_readdir_callback { struct dir_context ctx; struct compat_old_linux_dirent __user *dirent; int result; }; static int compat_fillonedir(struct dir_context *ctx, const char *name, int namlen, loff_t offset, u64 ino, unsigned int d_type) { struct compat_readdir_callback *buf = container_of(ctx, struct compat_readdir_callback, ctx); struct compat_old_linux_dirent __user *dirent; compat_ulong_t d_ino; if (buf->result) return -EINVAL; d_ino = ino; if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { buf->result = -EOVERFLOW; return -EOVERFLOW; } buf->result++; dirent = buf->dirent; if (!access_ok(VERIFY_WRITE, dirent, (unsigned long)(dirent->d_name + namlen + 1) - (unsigned long)dirent)) goto efault; if ( __put_user(d_ino, &dirent->d_ino) || __put_user(offset, &dirent->d_offset) || __put_user(namlen, &dirent->d_namlen) || __copy_to_user(dirent->d_name, name, namlen) || __put_user(0, dirent->d_name + namlen)) goto efault; return 0; efault: buf->result = -EFAULT; return -EFAULT; } COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd, struct compat_old_linux_dirent __user *, dirent, unsigned int, count) { int error; struct fd f = fdget_pos(fd); struct compat_readdir_callback buf = { .ctx.actor = compat_fillonedir, .dirent = dirent }; if (!f.file) return -EBADF; error = iterate_dir(f.file, &buf.ctx); if (buf.result) error = buf.result; fdput_pos(f); return error; } struct compat_linux_dirent { compat_ulong_t d_ino; compat_ulong_t d_off; unsigned short d_reclen; char d_name[1]; }; struct compat_getdents_callback { struct dir_context ctx; struct compat_linux_dirent __user *current_dir; struct compat_linux_dirent __user *previous; int count; int error; }; static int compat_filldir(struct dir_context *ctx, const char *name, int namlen, loff_t offset, u64 ino, unsigned int d_type) { struct compat_linux_dirent __user * dirent; struct compat_getdents_callback *buf = container_of(ctx, struct compat_getdents_callback, ctx); compat_ulong_t d_ino; int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) + namlen + 2, sizeof(compat_long_t)); buf->error = -EINVAL; /* only used if we fail.. */ if (reclen > buf->count) return -EINVAL; d_ino = ino; if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { buf->error = -EOVERFLOW; return -EOVERFLOW; } dirent = buf->previous; if (dirent) { if (signal_pending(current)) return -EINTR; if (__put_user(offset, &dirent->d_off)) goto efault; } dirent = buf->current_dir; if (__put_user(d_ino, &dirent->d_ino)) goto efault; if (__put_user(reclen, &dirent->d_reclen)) goto efault; if (copy_to_user(dirent->d_name, name, namlen)) goto efault; if (__put_user(0, dirent->d_name + namlen)) goto efault; if (__put_user(d_type, (char __user *) dirent + reclen - 1)) goto efault; buf->previous = dirent; dirent = (void __user *)dirent + reclen; buf->current_dir = dirent; buf->count -= reclen; return 0; efault: buf->error = -EFAULT; return -EFAULT; } COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd, struct compat_linux_dirent __user *, dirent, unsigned int, count) { struct fd f; struct compat_linux_dirent __user * lastdirent; struct compat_getdents_callback buf = { .ctx.actor = compat_filldir, .current_dir = dirent, .count = count }; int error; if (!access_ok(VERIFY_WRITE, dirent, count)) return -EFAULT; f = fdget_pos(fd); if (!f.file) return -EBADF; error = iterate_dir(f.file, &buf.ctx); if (error >= 0) error = buf.error; lastdirent = buf.previous; if (lastdirent) { if (put_user(buf.ctx.pos, &lastdirent->d_off)) error = -EFAULT; else error = count - buf.count; } fdput_pos(f); return error; } #endif |