Blame view
mm/mremap.c
13 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 |
/* * mm/mremap.c * * (C) Copyright 1996 Linus Torvalds * |
046c68842 mm: update my add... |
6 |
* Address space accounting code <alan@lxorguk.ukuu.org.uk> |
1da177e4c Linux-2.6.12-rc2 |
7 8 9 10 11 |
* (C) Copyright 2002 Red Hat Inc, All Rights Reserved */ #include <linux/mm.h> #include <linux/hugetlb.h> |
1da177e4c Linux-2.6.12-rc2 |
12 |
#include <linux/shm.h> |
1ff829957 ksm: prevent mrem... |
13 |
#include <linux/ksm.h> |
1da177e4c Linux-2.6.12-rc2 |
14 15 |
#include <linux/mman.h> #include <linux/swap.h> |
c59ede7b7 [PATCH] move capa... |
16 |
#include <linux/capability.h> |
1da177e4c Linux-2.6.12-rc2 |
17 18 19 20 |
#include <linux/fs.h> #include <linux/highmem.h> #include <linux/security.h> #include <linux/syscalls.h> |
cddb8a5c1 mmu-notifiers: core |
21 |
#include <linux/mmu_notifier.h> |
1da177e4c Linux-2.6.12-rc2 |
22 23 24 25 |
#include <asm/uaccess.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> |
ba470de43 mmap: handle mloc... |
26 |
#include "internal.h" |
7be7a5469 [PATCH] mm: move_... |
27 |
static pmd_t *get_old_pmd(struct mm_struct *mm, unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 |
{ pgd_t *pgd; pud_t *pud; pmd_t *pmd; pgd = pgd_offset(mm, addr); if (pgd_none_or_clear_bad(pgd)) return NULL; pud = pud_offset(pgd, addr); if (pud_none_or_clear_bad(pud)) return NULL; pmd = pmd_offset(pud, addr); if (pmd_none_or_clear_bad(pmd)) return NULL; |
7be7a5469 [PATCH] mm: move_... |
44 |
return pmd; |
1da177e4c Linux-2.6.12-rc2 |
45 |
} |
7be7a5469 [PATCH] mm: move_... |
46 |
static pmd_t *alloc_new_pmd(struct mm_struct *mm, unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
47 48 49 |
{ pgd_t *pgd; pud_t *pud; |
c74df32c7 [PATCH] mm: ptd_a... |
50 |
pmd_t *pmd; |
1da177e4c Linux-2.6.12-rc2 |
51 52 |
pgd = pgd_offset(mm, addr); |
1da177e4c Linux-2.6.12-rc2 |
53 54 |
pud = pud_alloc(mm, pgd, addr); if (!pud) |
c74df32c7 [PATCH] mm: ptd_a... |
55 |
return NULL; |
7be7a5469 [PATCH] mm: move_... |
56 |
|
1da177e4c Linux-2.6.12-rc2 |
57 |
pmd = pmd_alloc(mm, pud, addr); |
7be7a5469 [PATCH] mm: move_... |
58 |
if (!pmd) |
c74df32c7 [PATCH] mm: ptd_a... |
59 |
return NULL; |
7be7a5469 [PATCH] mm: move_... |
60 |
|
1bb3630e8 [PATCH] mm: ptd_a... |
61 |
if (!pmd_present(*pmd) && __pte_alloc(mm, pmd, addr)) |
c74df32c7 [PATCH] mm: ptd_a... |
62 |
return NULL; |
7be7a5469 [PATCH] mm: move_... |
63 |
return pmd; |
1da177e4c Linux-2.6.12-rc2 |
64 |
} |
7be7a5469 [PATCH] mm: move_... |
65 66 67 68 |
static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd, unsigned long old_addr, unsigned long old_end, struct vm_area_struct *new_vma, pmd_t *new_pmd, unsigned long new_addr) |
1da177e4c Linux-2.6.12-rc2 |
69 70 71 |
{ struct address_space *mapping = NULL; struct mm_struct *mm = vma->vm_mm; |
7be7a5469 [PATCH] mm: move_... |
72 |
pte_t *old_pte, *new_pte, pte; |
4c21e2f24 [PATCH] mm: split... |
73 |
spinlock_t *old_ptl, *new_ptl; |
cddb8a5c1 mmu-notifiers: core |
74 |
unsigned long old_start; |
1da177e4c Linux-2.6.12-rc2 |
75 |
|
cddb8a5c1 mmu-notifiers: core |
76 77 78 |
old_start = old_addr; mmu_notifier_invalidate_range_start(vma->vm_mm, old_start, old_end); |
1da177e4c Linux-2.6.12-rc2 |
79 80 81 |
if (vma->vm_file) { /* * Subtle point from Rajesh Venkatasubramanian: before |
25d9e2d15 truncate: new hel... |
82 83 |
* moving file-based ptes, we must lock truncate_pagecache * out, since it might clean the dst vma before the src vma, |
1da177e4c Linux-2.6.12-rc2 |
84 85 86 87 88 89 90 91 |
* and we propagate stale pages into the dst afterward. */ mapping = vma->vm_file->f_mapping; spin_lock(&mapping->i_mmap_lock); if (new_vma->vm_truncate_count && new_vma->vm_truncate_count != vma->vm_truncate_count) new_vma->vm_truncate_count = 0; } |
1da177e4c Linux-2.6.12-rc2 |
92 |
|
4c21e2f24 [PATCH] mm: split... |
93 94 95 96 |
/* * We don't have to worry about the ordering of src and dst * pte locks because exclusive mmap_sem prevents deadlock. */ |
c74df32c7 [PATCH] mm: ptd_a... |
97 98 |
old_pte = pte_offset_map_lock(mm, old_pmd, old_addr, &old_ptl); new_pte = pte_offset_map_nested(new_pmd, new_addr); |
4c21e2f24 [PATCH] mm: split... |
99 100 |
new_ptl = pte_lockptr(mm, new_pmd); if (new_ptl != old_ptl) |
f20dc5f7c [PATCH] lockdep: ... |
101 |
spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING); |
6606c3e0d [PATCH] paravirt:... |
102 |
arch_enter_lazy_mmu_mode(); |
7be7a5469 [PATCH] mm: move_... |
103 104 105 106 107 108 |
for (; old_addr < old_end; old_pte++, old_addr += PAGE_SIZE, new_pte++, new_addr += PAGE_SIZE) { if (pte_none(*old_pte)) continue; pte = ptep_clear_flush(vma, old_addr, old_pte); |
7be7a5469 [PATCH] mm: move_... |
109 110 |
pte = move_pte(pte, new_vma->vm_page_prot, old_addr, new_addr); set_pte_at(mm, new_addr, new_pte, pte); |
1da177e4c Linux-2.6.12-rc2 |
111 |
} |
7be7a5469 [PATCH] mm: move_... |
112 |
|
6606c3e0d [PATCH] paravirt:... |
113 |
arch_leave_lazy_mmu_mode(); |
4c21e2f24 [PATCH] mm: split... |
114 115 |
if (new_ptl != old_ptl) spin_unlock(new_ptl); |
7be7a5469 [PATCH] mm: move_... |
116 |
pte_unmap_nested(new_pte - 1); |
c74df32c7 [PATCH] mm: ptd_a... |
117 |
pte_unmap_unlock(old_pte - 1, old_ptl); |
1da177e4c Linux-2.6.12-rc2 |
118 119 |
if (mapping) spin_unlock(&mapping->i_mmap_lock); |
cddb8a5c1 mmu-notifiers: core |
120 |
mmu_notifier_invalidate_range_end(vma->vm_mm, old_start, old_end); |
1da177e4c Linux-2.6.12-rc2 |
121 |
} |
7be7a5469 [PATCH] mm: move_... |
122 |
#define LATENCY_LIMIT (64 * PAGE_SIZE) |
b6a2fea39 mm: variable leng... |
123 |
unsigned long move_page_tables(struct vm_area_struct *vma, |
1da177e4c Linux-2.6.12-rc2 |
124 125 126 |
unsigned long old_addr, struct vm_area_struct *new_vma, unsigned long new_addr, unsigned long len) { |
7be7a5469 [PATCH] mm: move_... |
127 128 |
unsigned long extent, next, old_end; pmd_t *old_pmd, *new_pmd; |
1da177e4c Linux-2.6.12-rc2 |
129 |
|
7be7a5469 [PATCH] mm: move_... |
130 131 |
old_end = old_addr + len; flush_cache_range(vma, old_addr, old_end); |
1da177e4c Linux-2.6.12-rc2 |
132 |
|
7be7a5469 [PATCH] mm: move_... |
133 |
for (; old_addr < old_end; old_addr += extent, new_addr += extent) { |
1da177e4c Linux-2.6.12-rc2 |
134 |
cond_resched(); |
7be7a5469 [PATCH] mm: move_... |
135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 |
next = (old_addr + PMD_SIZE) & PMD_MASK; if (next - 1 > old_end) next = old_end; extent = next - old_addr; old_pmd = get_old_pmd(vma->vm_mm, old_addr); if (!old_pmd) continue; new_pmd = alloc_new_pmd(vma->vm_mm, new_addr); if (!new_pmd) break; next = (new_addr + PMD_SIZE) & PMD_MASK; if (extent > next - new_addr) extent = next - new_addr; if (extent > LATENCY_LIMIT) extent = LATENCY_LIMIT; move_ptes(vma, old_pmd, old_addr, old_addr + extent, new_vma, new_pmd, new_addr); |
1da177e4c Linux-2.6.12-rc2 |
152 |
} |
7be7a5469 [PATCH] mm: move_... |
153 154 |
return len + old_addr - old_end; /* how much done */ |
1da177e4c Linux-2.6.12-rc2 |
155 156 157 158 159 160 161 162 163 164 165 166 |
} static unsigned long move_vma(struct vm_area_struct *vma, unsigned long old_addr, unsigned long old_len, unsigned long new_len, unsigned long new_addr) { struct mm_struct *mm = vma->vm_mm; struct vm_area_struct *new_vma; unsigned long vm_flags = vma->vm_flags; unsigned long new_pgoff; unsigned long moved_len; unsigned long excess = 0; |
365e9c87a [PATCH] mm: updat... |
167 |
unsigned long hiwater_vm; |
1da177e4c Linux-2.6.12-rc2 |
168 |
int split = 0; |
7103ad323 ksm: mremap use e... |
169 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
170 171 172 173 174 175 176 |
/* * We'd prefer to avoid failure later on in do_munmap: * which may split one vma into three before unmapping. */ if (mm->map_count >= sysctl_max_map_count - 3) return -ENOMEM; |
1ff829957 ksm: prevent mrem... |
177 178 179 180 181 182 183 |
/* * Advise KSM to break any KSM pages in the area to be moved: * it would be confusing if they were to turn up at the new * location, where they happen to coincide with different KSM * pages recently unmapped. But leave vma->vm_flags as it was, * so KSM can come around to merge on vma and new_vma afterwards. */ |
7103ad323 ksm: mremap use e... |
184 185 186 187 |
err = ksm_madvise(vma, old_addr, old_addr + old_len, MADV_UNMERGEABLE, &vm_flags); if (err) return err; |
1ff829957 ksm: prevent mrem... |
188 |
|
1da177e4c Linux-2.6.12-rc2 |
189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 |
new_pgoff = vma->vm_pgoff + ((old_addr - vma->vm_start) >> PAGE_SHIFT); new_vma = copy_vma(&vma, new_addr, new_len, new_pgoff); if (!new_vma) return -ENOMEM; moved_len = move_page_tables(vma, old_addr, new_vma, new_addr, old_len); if (moved_len < old_len) { /* * On error, move entries back from new area to old, * which will succeed since page tables still there, * and then proceed to unmap new area instead of old. */ move_page_tables(new_vma, new_addr, vma, old_addr, moved_len); vma = new_vma; old_len = new_len; old_addr = new_addr; new_addr = -ENOMEM; } /* Conceal VM_ACCOUNT so old reservation is not undone */ if (vm_flags & VM_ACCOUNT) { vma->vm_flags &= ~VM_ACCOUNT; excess = vma->vm_end - vma->vm_start - old_len; if (old_addr > vma->vm_start && old_addr + old_len < vma->vm_end) split = 1; } |
717990629 [PATCH] mm acct a... |
216 |
/* |
365e9c87a [PATCH] mm: updat... |
217 218 219 220 221 222 223 |
* If we failed to move page tables we still do total_vm increment * since do_munmap() will decrement it by old_len == new_len. * * Since total_vm is about to be raised artificially high for a * moment, we need to restore high watermark afterwards: if stats * are taken meanwhile, total_vm and hiwater_vm appear too high. * If this were a serious issue, we'd add a flag to do_munmap(). |
717990629 [PATCH] mm acct a... |
224 |
*/ |
365e9c87a [PATCH] mm: updat... |
225 |
hiwater_vm = mm->hiwater_vm; |
717990629 [PATCH] mm acct a... |
226 |
mm->total_vm += new_len >> PAGE_SHIFT; |
ab50b8ed8 [PATCH] mm: vm_st... |
227 |
vm_stat_account(mm, vma->vm_flags, vma->vm_file, new_len>>PAGE_SHIFT); |
717990629 [PATCH] mm acct a... |
228 |
|
1da177e4c Linux-2.6.12-rc2 |
229 230 231 232 233 |
if (do_munmap(mm, old_addr, old_len) < 0) { /* OOM: unable to split vma, just get accounts right */ vm_unacct_memory(excess >> PAGE_SHIFT); excess = 0; } |
365e9c87a [PATCH] mm: updat... |
234 |
mm->hiwater_vm = hiwater_vm; |
1da177e4c Linux-2.6.12-rc2 |
235 236 237 238 239 240 241 |
/* Restore VM_ACCOUNT if one or two pieces of vma left */ if (excess) { vma->vm_flags |= VM_ACCOUNT; if (split) vma->vm_next->vm_flags |= VM_ACCOUNT; } |
1da177e4c Linux-2.6.12-rc2 |
242 243 244 |
if (vm_flags & VM_LOCKED) { mm->locked_vm += new_len >> PAGE_SHIFT; if (new_len > old_len) |
ba470de43 mmap: handle mloc... |
245 246 |
mlock_vma_pages_range(new_vma, new_addr + old_len, new_addr + new_len); |
1da177e4c Linux-2.6.12-rc2 |
247 248 249 250 |
} return new_addr; } |
54f5de709 untangling do_mre... |
251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 |
static struct vm_area_struct *vma_to_resize(unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long *p) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma = find_vma(mm, addr); if (!vma || vma->vm_start > addr) goto Efault; if (is_vm_hugetlb_page(vma)) goto Einval; /* We can't remap across vm area boundaries */ if (old_len > vma->vm_end - addr) goto Efault; if (vma->vm_flags & (VM_DONTEXPAND | VM_PFNMAP)) { if (new_len > old_len) goto Efault; } if (vma->vm_flags & VM_LOCKED) { unsigned long locked, lock_limit; locked = mm->locked_vm << PAGE_SHIFT; |
59e99e5b9 mm: use rlimit he... |
275 |
lock_limit = rlimit(RLIMIT_MEMLOCK); |
54f5de709 untangling do_mre... |
276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 |
locked += new_len - old_len; if (locked > lock_limit && !capable(CAP_IPC_LOCK)) goto Eagain; } if (!may_expand_vm(mm, (new_len - old_len) >> PAGE_SHIFT)) goto Enomem; if (vma->vm_flags & VM_ACCOUNT) { unsigned long charged = (new_len - old_len) >> PAGE_SHIFT; if (security_vm_enough_memory(charged)) goto Efault; *p = charged; } return vma; Efault: /* very odd choice for most of the cases, but... */ return ERR_PTR(-EFAULT); Einval: return ERR_PTR(-EINVAL); Enomem: return ERR_PTR(-ENOMEM); Eagain: return ERR_PTR(-EAGAIN); } |
ecc1a8993 do_mremap() untan... |
302 303 304 305 306 307 308 309 |
static unsigned long mremap_to(unsigned long addr, unsigned long old_len, unsigned long new_addr, unsigned long new_len) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; unsigned long ret = -EINVAL; unsigned long charged = 0; |
097eed103 fix the arch chec... |
310 |
unsigned long map_flags; |
ecc1a8993 do_mremap() untan... |
311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 |
if (new_addr & ~PAGE_MASK) goto out; if (new_len > TASK_SIZE || new_addr > TASK_SIZE - new_len) goto out; /* Check if the location we're moving into overlaps the * old location at all, and fail if it does. */ if ((new_addr <= addr) && (new_addr+new_len) > addr) goto out; if ((addr <= new_addr) && (addr+old_len) > new_addr) goto out; ret = security_file_mmap(NULL, 0, 0, 0, new_addr, 1); if (ret) goto out; ret = do_munmap(mm, new_addr, new_len); if (ret) goto out; if (old_len >= new_len) { ret = do_munmap(mm, addr+new_len, old_len - new_len); if (ret && old_len != new_len) goto out; old_len = new_len; } vma = vma_to_resize(addr, old_len, new_len, &charged); if (IS_ERR(vma)) { ret = PTR_ERR(vma); goto out; } |
097eed103 fix the arch chec... |
347 348 349 |
map_flags = MAP_FIXED; if (vma->vm_flags & VM_MAYSHARE) map_flags |= MAP_SHARED; |
9206de95b Take arch_mmap_ch... |
350 |
|
097eed103 fix the arch chec... |
351 352 353 |
ret = get_unmapped_area(vma->vm_file, new_addr, new_len, vma->vm_pgoff + ((addr - vma->vm_start) >> PAGE_SHIFT), map_flags); |
ecc1a8993 do_mremap() untan... |
354 |
if (ret & ~PAGE_MASK) |
097eed103 fix the arch chec... |
355 356 357 358 359 360 361 |
goto out1; ret = move_vma(vma, addr, old_len, new_len, new_addr); if (!(ret & ~PAGE_MASK)) goto out; out1: vm_unacct_memory(charged); |
ecc1a8993 do_mremap() untan... |
362 363 364 365 |
out: return ret; } |
1a0ef85f8 do_mremap() untan... |
366 367 |
static int vma_expandable(struct vm_area_struct *vma, unsigned long delta) { |
f106af4e9 fix checks for ex... |
368 |
unsigned long end = vma->vm_end + delta; |
9206de95b Take arch_mmap_ch... |
369 |
if (end < vma->vm_end) /* overflow */ |
f106af4e9 fix checks for ex... |
370 |
return 0; |
9206de95b Take arch_mmap_ch... |
371 |
if (vma->vm_next && vma->vm_next->vm_start < end) /* intersection */ |
f106af4e9 fix checks for ex... |
372 373 374 |
return 0; if (get_unmapped_area(NULL, vma->vm_start, end - vma->vm_start, 0, MAP_FIXED) & ~PAGE_MASK) |
1a0ef85f8 do_mremap() untan... |
375 |
return 0; |
1a0ef85f8 do_mremap() untan... |
376 377 |
return 1; } |
1da177e4c Linux-2.6.12-rc2 |
378 379 380 381 382 383 384 385 386 387 388 |
/* * Expand (or shrink) an existing mapping, potentially moving it at the * same time (controlled by the MREMAP_MAYMOVE flag and available VM space) * * MREMAP_FIXED option added 5-Dec-1999 by Benjamin LaHaise * This option implies MREMAP_MAYMOVE. */ unsigned long do_mremap(unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, unsigned long new_addr) { |
d0de32d9b [PATCH] mm: do_mr... |
389 |
struct mm_struct *mm = current->mm; |
1da177e4c Linux-2.6.12-rc2 |
390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 |
struct vm_area_struct *vma; unsigned long ret = -EINVAL; unsigned long charged = 0; if (flags & ~(MREMAP_FIXED | MREMAP_MAYMOVE)) goto out; if (addr & ~PAGE_MASK) goto out; old_len = PAGE_ALIGN(old_len); new_len = PAGE_ALIGN(new_len); /* * We allow a zero old-len as a special case * for DOS-emu "duplicate shm area" thing. But * a zero new-len is nonsensical. */ if (!new_len) goto out; |
1da177e4c Linux-2.6.12-rc2 |
410 |
if (flags & MREMAP_FIXED) { |
ecc1a8993 do_mremap() untan... |
411 412 413 |
if (flags & MREMAP_MAYMOVE) ret = mremap_to(addr, old_len, new_addr, new_len); goto out; |
1da177e4c Linux-2.6.12-rc2 |
414 415 416 417 418 419 420 421 |
} /* * Always allow a shrinking remap: that just unmaps * the unnecessary pages.. * do_munmap does all the needed commit accounting */ if (old_len >= new_len) { |
d0de32d9b [PATCH] mm: do_mr... |
422 |
ret = do_munmap(mm, addr+new_len, old_len - new_len); |
1da177e4c Linux-2.6.12-rc2 |
423 424 425 |
if (ret && old_len != new_len) goto out; ret = addr; |
ecc1a8993 do_mremap() untan... |
426 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
427 428 429 |
} /* |
ecc1a8993 do_mremap() untan... |
430 |
* Ok, we need to grow.. |
1da177e4c Linux-2.6.12-rc2 |
431 |
*/ |
54f5de709 untangling do_mre... |
432 433 434 |
vma = vma_to_resize(addr, old_len, new_len, &charged); if (IS_ERR(vma)) { ret = PTR_ERR(vma); |
1da177e4c Linux-2.6.12-rc2 |
435 |
goto out; |
119f657c7 [PATCH] RLIMIT_AS... |
436 |
} |
1da177e4c Linux-2.6.12-rc2 |
437 |
|
1da177e4c Linux-2.6.12-rc2 |
438 |
/* old_len exactly to the end of the area.. |
1da177e4c Linux-2.6.12-rc2 |
439 |
*/ |
ecc1a8993 do_mremap() untan... |
440 |
if (old_len == vma->vm_end - addr) { |
1da177e4c Linux-2.6.12-rc2 |
441 |
/* can we just expand the current mapping? */ |
1a0ef85f8 do_mremap() untan... |
442 |
if (vma_expandable(vma, new_len - old_len)) { |
1da177e4c Linux-2.6.12-rc2 |
443 |
int pages = (new_len - old_len) >> PAGE_SHIFT; |
5beb49305 mm: change anon_v... |
444 445 446 447 448 |
if (vma_adjust(vma, vma->vm_start, addr + new_len, vma->vm_pgoff, NULL)) { ret = -ENOMEM; goto out; } |
1da177e4c Linux-2.6.12-rc2 |
449 |
|
d0de32d9b [PATCH] mm: do_mr... |
450 451 |
mm->total_vm += pages; vm_stat_account(mm, vma->vm_flags, vma->vm_file, pages); |
1da177e4c Linux-2.6.12-rc2 |
452 |
if (vma->vm_flags & VM_LOCKED) { |
d0de32d9b [PATCH] mm: do_mr... |
453 |
mm->locked_vm += pages; |
ba470de43 mmap: handle mloc... |
454 |
mlock_vma_pages_range(vma, addr + old_len, |
1da177e4c Linux-2.6.12-rc2 |
455 456 457 458 459 460 461 462 463 464 465 466 467 |
addr + new_len); } ret = addr; goto out; } } /* * We weren't able to just expand or shrink the area, * we need to create a new one and move it.. */ ret = -ENOMEM; if (flags & MREMAP_MAYMOVE) { |
ecc1a8993 do_mremap() untan... |
468 469 470 471 472 |
unsigned long map_flags = 0; if (vma->vm_flags & VM_MAYSHARE) map_flags |= MAP_SHARED; new_addr = get_unmapped_area(vma->vm_file, 0, new_len, |
935874141 fix pgoff in "hav... |
473 474 475 |
vma->vm_pgoff + ((addr - vma->vm_start) >> PAGE_SHIFT), map_flags); |
ecc1a8993 do_mremap() untan... |
476 477 478 |
if (new_addr & ~PAGE_MASK) { ret = new_addr; goto out; |
1da177e4c Linux-2.6.12-rc2 |
479 |
} |
ecc1a8993 do_mremap() untan... |
480 481 482 483 |
ret = security_file_mmap(NULL, 0, 0, 0, new_addr, 1); if (ret) goto out; |
1da177e4c Linux-2.6.12-rc2 |
484 485 486 487 488 |
ret = move_vma(vma, addr, old_len, new_len, new_addr); } out: if (ret & ~PAGE_MASK) vm_unacct_memory(charged); |
1da177e4c Linux-2.6.12-rc2 |
489 490 |
return ret; } |
6a6160a7b [CVE-2009-0029] S... |
491 492 493 |
SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, unsigned long, new_len, unsigned long, flags, unsigned long, new_addr) |
1da177e4c Linux-2.6.12-rc2 |
494 495 496 497 498 499 500 501 |
{ unsigned long ret; down_write(¤t->mm->mmap_sem); ret = do_mremap(addr, old_len, new_len, flags, new_addr); up_write(¤t->mm->mmap_sem); return ret; } |