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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * mm/mremap.c | |
3 | * | |
4 | * (C) Copyright 1996 Linus Torvalds | |
5 | * | |
046c6884 | 6 | * Address space accounting code <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
7 | * (C) Copyright 2002 Red Hat Inc, All Rights Reserved |
8 | */ | |
9 | ||
10 | #include <linux/mm.h> | |
11 | #include <linux/hugetlb.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/shm.h> | |
1ff82995 | 14 | #include <linux/ksm.h> |
1da177e4 LT |
15 | #include <linux/mman.h> |
16 | #include <linux/swap.h> | |
c59ede7b | 17 | #include <linux/capability.h> |
1da177e4 LT |
18 | #include <linux/fs.h> |
19 | #include <linux/highmem.h> | |
20 | #include <linux/security.h> | |
21 | #include <linux/syscalls.h> | |
cddb8a5c | 22 | #include <linux/mmu_notifier.h> |
1da177e4 LT |
23 | |
24 | #include <asm/uaccess.h> | |
25 | #include <asm/cacheflush.h> | |
26 | #include <asm/tlbflush.h> | |
27 | ||
ba470de4 RR |
28 | #include "internal.h" |
29 | ||
f106af4e AV |
30 | #ifndef arch_mmap_check |
31 | #define arch_mmap_check(addr, len, flags) (0) | |
32 | #endif | |
33 | ||
7be7a546 | 34 | static pmd_t *get_old_pmd(struct mm_struct *mm, unsigned long addr) |
1da177e4 LT |
35 | { |
36 | pgd_t *pgd; | |
37 | pud_t *pud; | |
38 | pmd_t *pmd; | |
39 | ||
40 | pgd = pgd_offset(mm, addr); | |
41 | if (pgd_none_or_clear_bad(pgd)) | |
42 | return NULL; | |
43 | ||
44 | pud = pud_offset(pgd, addr); | |
45 | if (pud_none_or_clear_bad(pud)) | |
46 | return NULL; | |
47 | ||
48 | pmd = pmd_offset(pud, addr); | |
49 | if (pmd_none_or_clear_bad(pmd)) | |
50 | return NULL; | |
51 | ||
7be7a546 | 52 | return pmd; |
1da177e4 LT |
53 | } |
54 | ||
7be7a546 | 55 | static pmd_t *alloc_new_pmd(struct mm_struct *mm, unsigned long addr) |
1da177e4 LT |
56 | { |
57 | pgd_t *pgd; | |
58 | pud_t *pud; | |
c74df32c | 59 | pmd_t *pmd; |
1da177e4 LT |
60 | |
61 | pgd = pgd_offset(mm, addr); | |
1da177e4 LT |
62 | pud = pud_alloc(mm, pgd, addr); |
63 | if (!pud) | |
c74df32c | 64 | return NULL; |
7be7a546 | 65 | |
1da177e4 | 66 | pmd = pmd_alloc(mm, pud, addr); |
7be7a546 | 67 | if (!pmd) |
c74df32c | 68 | return NULL; |
7be7a546 | 69 | |
1bb3630e | 70 | if (!pmd_present(*pmd) && __pte_alloc(mm, pmd, addr)) |
c74df32c HD |
71 | return NULL; |
72 | ||
7be7a546 | 73 | return pmd; |
1da177e4 LT |
74 | } |
75 | ||
7be7a546 HD |
76 | static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd, |
77 | unsigned long old_addr, unsigned long old_end, | |
78 | struct vm_area_struct *new_vma, pmd_t *new_pmd, | |
79 | unsigned long new_addr) | |
1da177e4 LT |
80 | { |
81 | struct address_space *mapping = NULL; | |
82 | struct mm_struct *mm = vma->vm_mm; | |
7be7a546 | 83 | pte_t *old_pte, *new_pte, pte; |
4c21e2f2 | 84 | spinlock_t *old_ptl, *new_ptl; |
cddb8a5c | 85 | unsigned long old_start; |
1da177e4 | 86 | |
cddb8a5c AA |
87 | old_start = old_addr; |
88 | mmu_notifier_invalidate_range_start(vma->vm_mm, | |
89 | old_start, old_end); | |
1da177e4 LT |
90 | if (vma->vm_file) { |
91 | /* | |
92 | * Subtle point from Rajesh Venkatasubramanian: before | |
25d9e2d1 NP |
93 | * moving file-based ptes, we must lock truncate_pagecache |
94 | * out, since it might clean the dst vma before the src vma, | |
1da177e4 LT |
95 | * and we propagate stale pages into the dst afterward. |
96 | */ | |
97 | mapping = vma->vm_file->f_mapping; | |
98 | spin_lock(&mapping->i_mmap_lock); | |
99 | if (new_vma->vm_truncate_count && | |
100 | new_vma->vm_truncate_count != vma->vm_truncate_count) | |
101 | new_vma->vm_truncate_count = 0; | |
102 | } | |
1da177e4 | 103 | |
4c21e2f2 HD |
104 | /* |
105 | * We don't have to worry about the ordering of src and dst | |
106 | * pte locks because exclusive mmap_sem prevents deadlock. | |
107 | */ | |
c74df32c HD |
108 | old_pte = pte_offset_map_lock(mm, old_pmd, old_addr, &old_ptl); |
109 | new_pte = pte_offset_map_nested(new_pmd, new_addr); | |
4c21e2f2 HD |
110 | new_ptl = pte_lockptr(mm, new_pmd); |
111 | if (new_ptl != old_ptl) | |
f20dc5f7 | 112 | spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING); |
6606c3e0 | 113 | arch_enter_lazy_mmu_mode(); |
7be7a546 HD |
114 | |
115 | for (; old_addr < old_end; old_pte++, old_addr += PAGE_SIZE, | |
116 | new_pte++, new_addr += PAGE_SIZE) { | |
117 | if (pte_none(*old_pte)) | |
118 | continue; | |
119 | pte = ptep_clear_flush(vma, old_addr, old_pte); | |
7be7a546 HD |
120 | pte = move_pte(pte, new_vma->vm_page_prot, old_addr, new_addr); |
121 | set_pte_at(mm, new_addr, new_pte, pte); | |
1da177e4 | 122 | } |
7be7a546 | 123 | |
6606c3e0 | 124 | arch_leave_lazy_mmu_mode(); |
4c21e2f2 HD |
125 | if (new_ptl != old_ptl) |
126 | spin_unlock(new_ptl); | |
7be7a546 | 127 | pte_unmap_nested(new_pte - 1); |
c74df32c | 128 | pte_unmap_unlock(old_pte - 1, old_ptl); |
1da177e4 LT |
129 | if (mapping) |
130 | spin_unlock(&mapping->i_mmap_lock); | |
cddb8a5c | 131 | mmu_notifier_invalidate_range_end(vma->vm_mm, old_start, old_end); |
1da177e4 LT |
132 | } |
133 | ||
7be7a546 HD |
134 | #define LATENCY_LIMIT (64 * PAGE_SIZE) |
135 | ||
b6a2fea3 | 136 | unsigned long move_page_tables(struct vm_area_struct *vma, |
1da177e4 LT |
137 | unsigned long old_addr, struct vm_area_struct *new_vma, |
138 | unsigned long new_addr, unsigned long len) | |
139 | { | |
7be7a546 HD |
140 | unsigned long extent, next, old_end; |
141 | pmd_t *old_pmd, *new_pmd; | |
1da177e4 | 142 | |
7be7a546 HD |
143 | old_end = old_addr + len; |
144 | flush_cache_range(vma, old_addr, old_end); | |
1da177e4 | 145 | |
7be7a546 | 146 | for (; old_addr < old_end; old_addr += extent, new_addr += extent) { |
1da177e4 | 147 | cond_resched(); |
7be7a546 HD |
148 | next = (old_addr + PMD_SIZE) & PMD_MASK; |
149 | if (next - 1 > old_end) | |
150 | next = old_end; | |
151 | extent = next - old_addr; | |
152 | old_pmd = get_old_pmd(vma->vm_mm, old_addr); | |
153 | if (!old_pmd) | |
154 | continue; | |
155 | new_pmd = alloc_new_pmd(vma->vm_mm, new_addr); | |
156 | if (!new_pmd) | |
157 | break; | |
158 | next = (new_addr + PMD_SIZE) & PMD_MASK; | |
159 | if (extent > next - new_addr) | |
160 | extent = next - new_addr; | |
161 | if (extent > LATENCY_LIMIT) | |
162 | extent = LATENCY_LIMIT; | |
163 | move_ptes(vma, old_pmd, old_addr, old_addr + extent, | |
164 | new_vma, new_pmd, new_addr); | |
1da177e4 | 165 | } |
7be7a546 HD |
166 | |
167 | return len + old_addr - old_end; /* how much done */ | |
1da177e4 LT |
168 | } |
169 | ||
170 | static unsigned long move_vma(struct vm_area_struct *vma, | |
171 | unsigned long old_addr, unsigned long old_len, | |
172 | unsigned long new_len, unsigned long new_addr) | |
173 | { | |
174 | struct mm_struct *mm = vma->vm_mm; | |
175 | struct vm_area_struct *new_vma; | |
176 | unsigned long vm_flags = vma->vm_flags; | |
177 | unsigned long new_pgoff; | |
178 | unsigned long moved_len; | |
179 | unsigned long excess = 0; | |
365e9c87 | 180 | unsigned long hiwater_vm; |
1da177e4 | 181 | int split = 0; |
7103ad32 | 182 | int err; |
1da177e4 LT |
183 | |
184 | /* | |
185 | * We'd prefer to avoid failure later on in do_munmap: | |
186 | * which may split one vma into three before unmapping. | |
187 | */ | |
188 | if (mm->map_count >= sysctl_max_map_count - 3) | |
189 | return -ENOMEM; | |
190 | ||
1ff82995 HD |
191 | /* |
192 | * Advise KSM to break any KSM pages in the area to be moved: | |
193 | * it would be confusing if they were to turn up at the new | |
194 | * location, where they happen to coincide with different KSM | |
195 | * pages recently unmapped. But leave vma->vm_flags as it was, | |
196 | * so KSM can come around to merge on vma and new_vma afterwards. | |
197 | */ | |
7103ad32 HD |
198 | err = ksm_madvise(vma, old_addr, old_addr + old_len, |
199 | MADV_UNMERGEABLE, &vm_flags); | |
200 | if (err) | |
201 | return err; | |
1ff82995 | 202 | |
1da177e4 LT |
203 | new_pgoff = vma->vm_pgoff + ((old_addr - vma->vm_start) >> PAGE_SHIFT); |
204 | new_vma = copy_vma(&vma, new_addr, new_len, new_pgoff); | |
205 | if (!new_vma) | |
206 | return -ENOMEM; | |
207 | ||
208 | moved_len = move_page_tables(vma, old_addr, new_vma, new_addr, old_len); | |
209 | if (moved_len < old_len) { | |
210 | /* | |
211 | * On error, move entries back from new area to old, | |
212 | * which will succeed since page tables still there, | |
213 | * and then proceed to unmap new area instead of old. | |
214 | */ | |
215 | move_page_tables(new_vma, new_addr, vma, old_addr, moved_len); | |
216 | vma = new_vma; | |
217 | old_len = new_len; | |
218 | old_addr = new_addr; | |
219 | new_addr = -ENOMEM; | |
220 | } | |
221 | ||
222 | /* Conceal VM_ACCOUNT so old reservation is not undone */ | |
223 | if (vm_flags & VM_ACCOUNT) { | |
224 | vma->vm_flags &= ~VM_ACCOUNT; | |
225 | excess = vma->vm_end - vma->vm_start - old_len; | |
226 | if (old_addr > vma->vm_start && | |
227 | old_addr + old_len < vma->vm_end) | |
228 | split = 1; | |
229 | } | |
230 | ||
71799062 | 231 | /* |
365e9c87 HD |
232 | * If we failed to move page tables we still do total_vm increment |
233 | * since do_munmap() will decrement it by old_len == new_len. | |
234 | * | |
235 | * Since total_vm is about to be raised artificially high for a | |
236 | * moment, we need to restore high watermark afterwards: if stats | |
237 | * are taken meanwhile, total_vm and hiwater_vm appear too high. | |
238 | * If this were a serious issue, we'd add a flag to do_munmap(). | |
71799062 | 239 | */ |
365e9c87 | 240 | hiwater_vm = mm->hiwater_vm; |
71799062 | 241 | mm->total_vm += new_len >> PAGE_SHIFT; |
ab50b8ed | 242 | vm_stat_account(mm, vma->vm_flags, vma->vm_file, new_len>>PAGE_SHIFT); |
71799062 | 243 | |
1da177e4 LT |
244 | if (do_munmap(mm, old_addr, old_len) < 0) { |
245 | /* OOM: unable to split vma, just get accounts right */ | |
246 | vm_unacct_memory(excess >> PAGE_SHIFT); | |
247 | excess = 0; | |
248 | } | |
365e9c87 | 249 | mm->hiwater_vm = hiwater_vm; |
1da177e4 LT |
250 | |
251 | /* Restore VM_ACCOUNT if one or two pieces of vma left */ | |
252 | if (excess) { | |
253 | vma->vm_flags |= VM_ACCOUNT; | |
254 | if (split) | |
255 | vma->vm_next->vm_flags |= VM_ACCOUNT; | |
256 | } | |
257 | ||
1da177e4 LT |
258 | if (vm_flags & VM_LOCKED) { |
259 | mm->locked_vm += new_len >> PAGE_SHIFT; | |
260 | if (new_len > old_len) | |
ba470de4 RR |
261 | mlock_vma_pages_range(new_vma, new_addr + old_len, |
262 | new_addr + new_len); | |
1da177e4 LT |
263 | } |
264 | ||
265 | return new_addr; | |
266 | } | |
267 | ||
54f5de70 AV |
268 | static struct vm_area_struct *vma_to_resize(unsigned long addr, |
269 | unsigned long old_len, unsigned long new_len, unsigned long *p) | |
270 | { | |
271 | struct mm_struct *mm = current->mm; | |
272 | struct vm_area_struct *vma = find_vma(mm, addr); | |
273 | ||
274 | if (!vma || vma->vm_start > addr) | |
275 | goto Efault; | |
276 | ||
277 | if (is_vm_hugetlb_page(vma)) | |
278 | goto Einval; | |
279 | ||
280 | /* We can't remap across vm area boundaries */ | |
281 | if (old_len > vma->vm_end - addr) | |
282 | goto Efault; | |
283 | ||
284 | if (vma->vm_flags & (VM_DONTEXPAND | VM_PFNMAP)) { | |
285 | if (new_len > old_len) | |
286 | goto Efault; | |
287 | } | |
288 | ||
289 | if (vma->vm_flags & VM_LOCKED) { | |
290 | unsigned long locked, lock_limit; | |
291 | locked = mm->locked_vm << PAGE_SHIFT; | |
292 | lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur; | |
293 | locked += new_len - old_len; | |
294 | if (locked > lock_limit && !capable(CAP_IPC_LOCK)) | |
295 | goto Eagain; | |
296 | } | |
297 | ||
298 | if (!may_expand_vm(mm, (new_len - old_len) >> PAGE_SHIFT)) | |
299 | goto Enomem; | |
300 | ||
301 | if (vma->vm_flags & VM_ACCOUNT) { | |
302 | unsigned long charged = (new_len - old_len) >> PAGE_SHIFT; | |
303 | if (security_vm_enough_memory(charged)) | |
304 | goto Efault; | |
305 | *p = charged; | |
306 | } | |
307 | ||
308 | return vma; | |
309 | ||
310 | Efault: /* very odd choice for most of the cases, but... */ | |
311 | return ERR_PTR(-EFAULT); | |
312 | Einval: | |
313 | return ERR_PTR(-EINVAL); | |
314 | Enomem: | |
315 | return ERR_PTR(-ENOMEM); | |
316 | Eagain: | |
317 | return ERR_PTR(-EAGAIN); | |
318 | } | |
319 | ||
ecc1a899 AV |
320 | static unsigned long mremap_to(unsigned long addr, |
321 | unsigned long old_len, unsigned long new_addr, | |
322 | unsigned long new_len) | |
323 | { | |
324 | struct mm_struct *mm = current->mm; | |
325 | struct vm_area_struct *vma; | |
326 | unsigned long ret = -EINVAL; | |
327 | unsigned long charged = 0; | |
097eed10 | 328 | unsigned long map_flags; |
ecc1a899 AV |
329 | |
330 | if (new_addr & ~PAGE_MASK) | |
331 | goto out; | |
332 | ||
333 | if (new_len > TASK_SIZE || new_addr > TASK_SIZE - new_len) | |
334 | goto out; | |
335 | ||
336 | /* Check if the location we're moving into overlaps the | |
337 | * old location at all, and fail if it does. | |
338 | */ | |
339 | if ((new_addr <= addr) && (new_addr+new_len) > addr) | |
340 | goto out; | |
341 | ||
342 | if ((addr <= new_addr) && (addr+old_len) > new_addr) | |
343 | goto out; | |
344 | ||
345 | ret = security_file_mmap(NULL, 0, 0, 0, new_addr, 1); | |
346 | if (ret) | |
347 | goto out; | |
348 | ||
349 | ret = do_munmap(mm, new_addr, new_len); | |
350 | if (ret) | |
351 | goto out; | |
352 | ||
353 | if (old_len >= new_len) { | |
354 | ret = do_munmap(mm, addr+new_len, old_len - new_len); | |
355 | if (ret && old_len != new_len) | |
356 | goto out; | |
357 | old_len = new_len; | |
358 | } | |
359 | ||
360 | vma = vma_to_resize(addr, old_len, new_len, &charged); | |
361 | if (IS_ERR(vma)) { | |
362 | ret = PTR_ERR(vma); | |
363 | goto out; | |
364 | } | |
365 | ||
097eed10 AV |
366 | map_flags = MAP_FIXED; |
367 | if (vma->vm_flags & VM_MAYSHARE) | |
368 | map_flags |= MAP_SHARED; | |
369 | ret = arch_mmap_check(new_addr, new_len, map_flags); | |
370 | if (ret) | |
371 | goto out1; | |
372 | ret = get_unmapped_area(vma->vm_file, new_addr, new_len, vma->vm_pgoff + | |
373 | ((addr - vma->vm_start) >> PAGE_SHIFT), | |
374 | map_flags); | |
ecc1a899 | 375 | if (ret & ~PAGE_MASK) |
097eed10 AV |
376 | goto out1; |
377 | ||
378 | ret = move_vma(vma, addr, old_len, new_len, new_addr); | |
379 | if (!(ret & ~PAGE_MASK)) | |
380 | goto out; | |
381 | out1: | |
382 | vm_unacct_memory(charged); | |
ecc1a899 AV |
383 | |
384 | out: | |
385 | return ret; | |
386 | } | |
387 | ||
1a0ef85f AV |
388 | static int vma_expandable(struct vm_area_struct *vma, unsigned long delta) |
389 | { | |
f106af4e | 390 | unsigned long end = vma->vm_end + delta; |
1a0ef85f AV |
391 | unsigned long max_addr = TASK_SIZE; |
392 | if (vma->vm_next) | |
393 | max_addr = vma->vm_next->vm_start; | |
f106af4e AV |
394 | if (max_addr < end || end < vma->vm_end) |
395 | return 0; | |
396 | if (arch_mmap_check(vma->vm_start, end - vma->vm_start, MAP_FIXED)) | |
397 | return 0; | |
398 | if (get_unmapped_area(NULL, vma->vm_start, end - vma->vm_start, | |
399 | 0, MAP_FIXED) & ~PAGE_MASK) | |
1a0ef85f | 400 | return 0; |
1a0ef85f AV |
401 | return 1; |
402 | } | |
403 | ||
1da177e4 LT |
404 | /* |
405 | * Expand (or shrink) an existing mapping, potentially moving it at the | |
406 | * same time (controlled by the MREMAP_MAYMOVE flag and available VM space) | |
407 | * | |
408 | * MREMAP_FIXED option added 5-Dec-1999 by Benjamin LaHaise | |
409 | * This option implies MREMAP_MAYMOVE. | |
410 | */ | |
411 | unsigned long do_mremap(unsigned long addr, | |
412 | unsigned long old_len, unsigned long new_len, | |
413 | unsigned long flags, unsigned long new_addr) | |
414 | { | |
d0de32d9 | 415 | struct mm_struct *mm = current->mm; |
1da177e4 LT |
416 | struct vm_area_struct *vma; |
417 | unsigned long ret = -EINVAL; | |
418 | unsigned long charged = 0; | |
419 | ||
420 | if (flags & ~(MREMAP_FIXED | MREMAP_MAYMOVE)) | |
421 | goto out; | |
422 | ||
423 | if (addr & ~PAGE_MASK) | |
424 | goto out; | |
425 | ||
426 | old_len = PAGE_ALIGN(old_len); | |
427 | new_len = PAGE_ALIGN(new_len); | |
428 | ||
429 | /* | |
430 | * We allow a zero old-len as a special case | |
431 | * for DOS-emu "duplicate shm area" thing. But | |
432 | * a zero new-len is nonsensical. | |
433 | */ | |
434 | if (!new_len) | |
435 | goto out; | |
436 | ||
1da177e4 | 437 | if (flags & MREMAP_FIXED) { |
ecc1a899 AV |
438 | if (flags & MREMAP_MAYMOVE) |
439 | ret = mremap_to(addr, old_len, new_addr, new_len); | |
440 | goto out; | |
1da177e4 LT |
441 | } |
442 | ||
443 | /* | |
444 | * Always allow a shrinking remap: that just unmaps | |
445 | * the unnecessary pages.. | |
446 | * do_munmap does all the needed commit accounting | |
447 | */ | |
448 | if (old_len >= new_len) { | |
d0de32d9 | 449 | ret = do_munmap(mm, addr+new_len, old_len - new_len); |
1da177e4 LT |
450 | if (ret && old_len != new_len) |
451 | goto out; | |
452 | ret = addr; | |
ecc1a899 | 453 | goto out; |
1da177e4 LT |
454 | } |
455 | ||
456 | /* | |
ecc1a899 | 457 | * Ok, we need to grow.. |
1da177e4 | 458 | */ |
54f5de70 AV |
459 | vma = vma_to_resize(addr, old_len, new_len, &charged); |
460 | if (IS_ERR(vma)) { | |
461 | ret = PTR_ERR(vma); | |
1da177e4 | 462 | goto out; |
119f657c | 463 | } |
1da177e4 | 464 | |
1da177e4 | 465 | /* old_len exactly to the end of the area.. |
1da177e4 | 466 | */ |
ecc1a899 | 467 | if (old_len == vma->vm_end - addr) { |
1da177e4 | 468 | /* can we just expand the current mapping? */ |
1a0ef85f | 469 | if (vma_expandable(vma, new_len - old_len)) { |
1da177e4 LT |
470 | int pages = (new_len - old_len) >> PAGE_SHIFT; |
471 | ||
472 | vma_adjust(vma, vma->vm_start, | |
473 | addr + new_len, vma->vm_pgoff, NULL); | |
474 | ||
d0de32d9 HD |
475 | mm->total_vm += pages; |
476 | vm_stat_account(mm, vma->vm_flags, vma->vm_file, pages); | |
1da177e4 | 477 | if (vma->vm_flags & VM_LOCKED) { |
d0de32d9 | 478 | mm->locked_vm += pages; |
ba470de4 | 479 | mlock_vma_pages_range(vma, addr + old_len, |
1da177e4 LT |
480 | addr + new_len); |
481 | } | |
482 | ret = addr; | |
483 | goto out; | |
484 | } | |
485 | } | |
486 | ||
487 | /* | |
488 | * We weren't able to just expand or shrink the area, | |
489 | * we need to create a new one and move it.. | |
490 | */ | |
491 | ret = -ENOMEM; | |
492 | if (flags & MREMAP_MAYMOVE) { | |
ecc1a899 AV |
493 | unsigned long map_flags = 0; |
494 | if (vma->vm_flags & VM_MAYSHARE) | |
495 | map_flags |= MAP_SHARED; | |
496 | ||
497 | new_addr = get_unmapped_area(vma->vm_file, 0, new_len, | |
93587414 AV |
498 | vma->vm_pgoff + |
499 | ((addr - vma->vm_start) >> PAGE_SHIFT), | |
500 | map_flags); | |
ecc1a899 AV |
501 | if (new_addr & ~PAGE_MASK) { |
502 | ret = new_addr; | |
503 | goto out; | |
1da177e4 | 504 | } |
ecc1a899 AV |
505 | |
506 | ret = security_file_mmap(NULL, 0, 0, 0, new_addr, 1); | |
507 | if (ret) | |
508 | goto out; | |
1da177e4 LT |
509 | ret = move_vma(vma, addr, old_len, new_len, new_addr); |
510 | } | |
511 | out: | |
512 | if (ret & ~PAGE_MASK) | |
513 | vm_unacct_memory(charged); | |
1da177e4 LT |
514 | return ret; |
515 | } | |
516 | ||
6a6160a7 HC |
517 | SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, |
518 | unsigned long, new_len, unsigned long, flags, | |
519 | unsigned long, new_addr) | |
1da177e4 LT |
520 | { |
521 | unsigned long ret; | |
522 | ||
523 | down_write(¤t->mm->mmap_sem); | |
524 | ret = do_mremap(addr, old_len, new_len, flags, new_addr); | |
525 | up_write(¤t->mm->mmap_sem); | |
526 | return ret; | |
527 | } |