/* * linux/mm/mlock.c * * (C) Copyright 1995 Linus Torvalds * (C) Copyright 2002 Christoph Hellwig */ #include <linux/capability.h> #include <linux/mman.h> #include <linux/mm.h> #include <linux/swap.h> #include <linux/swapops.h> #include <linux/pagemap.h> #include <linux/mempolicy.h> #include <linux/syscalls.h> #include <linux/sched.h> #include <linux/export.h> #include <linux/rmap.h> #include <linux/mmzone.h> #include <linux/hugetlb.h> #include "internal.h" int can_do_mlock(void) { if (capable(CAP_IPC_LOCK)) return 1; if (rlimit(RLIMIT_MEMLOCK) != 0) return 1; return 0; } EXPORT_SYMBOL(can_do_mlock); /* * Mlocked pages are marked with PageMlocked() flag for efficient testing * in vmscan and, possibly, the fault path; and to support semi-accurate * statistics. * * An mlocked page [PageMlocked(page)] is unevictable. As such, it will * be placed on the LRU "unevictable" list, rather than the [in]active lists. * The unevictable list is an LRU sibling list to the [in]active lists. * PageUnevictable is set to indicate the unevictable state. * * When lazy mlocking via vmscan, it is important to ensure that the * vma's VM_LOCKED status is not concurrently being modified, otherwise we * may have mlocked a page that is being munlocked. So lazy mlock must take * the mmap_sem for read, and verify that the vma really is locked * (see mm/rmap.c). */ /* * LRU accounting for clear_page_mlock() */ void clear_page_mlock(struct page *page) { if (!TestClearPageMlocked(page)) return; mod_zone_page_state(page_zone(page), NR_MLOCK, -hpage_nr_pages(page)); count_vm_event(UNEVICTABLE_PGCLEARED); if (!isolate_lru_page(page)) { putback_lru_page(page); } else { /* * We lost the race. the page already moved to evictable list. */ if (PageUnevictable(page)) count_vm_event(UNEVICTABLE_PGSTRANDED); } } /* * Mark page as mlocked if not already. * If page on LRU, isolate and putback to move to unevictable list. */ void mlock_vma_page(struct page *page) { BUG_ON(!PageLocked(page)); if (!TestSetPageMlocked(page)) { mod_zone_page_state(page_zone(page), NR_MLOCK, hpage_nr_pages(page)); count_vm_event(UNEVICTABLE_PGMLOCKED); if (!isolate_lru_page(page)) putback_lru_page(page); } } /** * munlock_vma_page - munlock a vma page * @page - page to be unlocked * * called from munlock()/munmap() path with page supposedly on the LRU. * When we munlock a page, because the vma where we found the page is being * munlock()ed or munmap()ed, we want to check whether other vmas hold the * page locked so that we can leave it on the unevictable lru list and not * bother vmscan with it. However, to walk the page's rmap list in * try_to_munlock() we must isolate the page from the LRU. If some other * task has removed the page from the LRU, we won't be able to do that. * So we clear the PageMlocked as we might not get another chance. If we * can't isolate the page, we leave it for putback_lru_page() and vmscan * [page_referenced()/try_to_unmap()] to deal with. */ unsigned int munlock_vma_page(struct page *page) { unsigned int page_mask = 0; BUG_ON(!PageLocked(page)); if (TestClearPageMlocked(page)) { unsigned int nr_pages = hpage_nr_pages(page); mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages); page_mask = nr_pages - 1; if (!isolate_lru_page(page)) { int ret = SWAP_AGAIN; /* * Optimization: if the page was mapped just once, * that's our mapping and we don't need to check all the * other vmas. */ if (page_mapcount(page) > 1) ret = try_to_munlock(page); /* * did try_to_unlock() succeed or punt? */ if (ret != SWAP_MLOCK) count_vm_event(UNEVICTABLE_PGMUNLOCKED); putback_lru_page(page); } else { /* * Some other task has removed the page from the LRU. * putback_lru_page() will take care of removing the * page from the unevictable list, if necessary. * vmscan [page_referenced()] will move the page back * to the unevictable list if some other vma has it * mlocked. */ if (PageUnevictable(page)) count_vm_event(UNEVICTABLE_PGSTRANDED); else count_vm_event(UNEVICTABLE_PGMUNLOCKED); } } return page_mask; } /** * __mlock_vma_pages_range() - mlock a range of pages in the vma. * @vma: target vma * @start: start address * @end: end address * * This takes care of making the pages present too. * * return 0 on success, negative error code on error. * * vma->vm_mm->mmap_sem must be held for at least read. */ long __mlock_vma_pages_range(struct vm_area_struct *vma, unsigned long start, unsigned long end, int *nonblocking) { struct mm_struct *mm = vma->vm_mm; unsigned long nr_pages = (end - start) / PAGE_SIZE; int gup_flags; VM_BUG_ON(start & ~PAGE_MASK); VM_BUG_ON(end & ~PAGE_MASK); VM_BUG_ON(start < vma->vm_start); VM_BUG_ON(end > vma->vm_end); VM_BUG_ON(!rwsem_is_locked(&mm->mmap_sem)); gup_flags = FOLL_TOUCH | FOLL_MLOCK; /* * We want to touch writable mappings with a write fault in order * to break COW, except for shared mappings because these don't COW * and we would not want to dirty them for nothing. */ if ((vma->vm_flags & (VM_WRITE | VM_SHARED)) == VM_WRITE) gup_flags |= FOLL_WRITE; /* * We want mlock to succeed for regions that have any permissions * other than PROT_NONE. */ if (vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC)) gup_flags |= FOLL_FORCE; /* * We made sure addr is within a VMA, so the following will * not result in a stack expansion that recurses back here. */ return __get_user_pages(current, mm, start, nr_pages, gup_flags, NULL, NULL, nonblocking); } /* * convert get_user_pages() return value to posix mlock() error */ static int __mlock_posix_error_return(long retval) { if (retval == -EFAULT) retval = -ENOMEM; else if (retval == -ENOMEM) retval = -EAGAIN; return retval; } /* * munlock_vma_pages_range() - munlock all pages in the vma range.' * @vma - vma containing range to be munlock()ed. * @start - start address in @vma of the range * @end - end of range in @vma. * * For mremap(), munmap() and exit(). * * Called with @vma VM_LOCKED. * * Returns with VM_LOCKED cleared. Callers must be prepared to * deal with this. * * We don't save and restore VM_LOCKED here because pages are * still on lru. In unmap path, pages might be scanned by reclaim * and re-mlocked by try_to_{munlock|unmap} before we unmap and * free them. This will result in freeing mlocked pages. */ void munlock_vma_pages_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { vma->vm_flags &= ~VM_LOCKED; while (start < end) { struct page *page; unsigned int page_mask, page_increm; /* * Although FOLL_DUMP is intended for get_dump_page(), * it just so happens that its special treatment of the * ZERO_PAGE (returning an error instead of doing get_page) * suits munlock very well (and if somehow an abnormal page * has sneaked into the range, we won't oops here: great). */ page = follow_page_mask(vma, start, FOLL_GET | FOLL_DUMP, &page_mask); if (page && !IS_ERR(page)) { lock_page(page); lru_add_drain(); /* * Any THP page found by follow_page_mask() may have * gotten split before reaching munlock_vma_page(), * so we need to recompute the page_mask here. */ page_mask = munlock_vma_page(page); unlock_page(page); put_page(page); } page_increm = 1 + (~(start >> PAGE_SHIFT) & page_mask); start += page_increm * PAGE_SIZE; cond_resched(); } } /* * mlock_fixup - handle mlock[all]/munlock[all] requests. * * Filters out "special" vmas -- VM_LOCKED never gets set for these, and * munlock is a no-op. However, for some special vmas, we go ahead and * populate the ptes. * * For vmas that pass the filters, merge/split as appropriate. */ static int mlock_fixup(struct vm_area_struct *vma, struct vm_area_struct **prev, unsigned long start, unsigned long end, vm_flags_t newflags) { struct mm_struct *mm = vma->vm_mm; pgoff_t pgoff; int nr_pages; int ret = 0; int lock = !!(newflags & VM_LOCKED); if (newflags == vma->vm_flags || (vma->vm_flags & VM_SPECIAL) || is_vm_hugetlb_page(vma) || vma == get_gate_vma(current->mm)) goto out; /* don't set VM_LOCKED, don't count */ pgoff = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT); *prev = vma_merge(mm, *prev, start, end, newflags, vma->anon_vma, vma->vm_file, pgoff, vma_policy(vma)); if (*prev) { vma = *prev; goto success; } if (start != vma->vm_start) { ret = split_vma(mm, vma, start, 1); if (ret) goto out; } if (end != vma->vm_end) { ret = split_vma(mm, vma, end, 0); if (ret) goto out; } success: /* * Keep track of amount of locked VM. */ nr_pages = (end - start) >> PAGE_SHIFT; if (!lock) nr_pages = -nr_pages; mm->locked_vm += nr_pages; /* * vm_flags is protected by the mmap_sem held in write mode. * It's okay if try_to_unmap_one unmaps a page just after we * set VM_LOCKED, __mlock_vma_pages_range will bring it back. */ if (lock) vma->vm_flags = newflags; else munlock_vma_pages_range(vma, start, end); out: *prev = vma; return ret; } static int do_mlock(unsigned long start, size_t len, int on) { unsigned long nstart, end, tmp; struct vm_area_struct * vma, * prev; int error; VM_BUG_ON(start & ~PAGE_MASK); VM_BUG_ON(len != PAGE_ALIGN(len)); end = start + len; if (end < start) return -EINVAL; if (end == start) return 0; vma = find_vma(current->mm, start); if (!vma || vma->vm_start > start) return -ENOMEM; prev = vma->vm_prev; if (start > vma->vm_start) prev = vma; for (nstart = start ; ; ) { vm_flags_t newflags; /* Here we know that vma->vm_start <= nstart < vma->vm_end. */ newflags = vma->vm_flags & ~VM_LOCKED; if (on) newflags |= VM_LOCKED | VM_POPULATE; tmp = vma->vm_end; if (tmp > end) tmp = end; error = mlock_fixup(vma, &prev, nstart, tmp, newflags); if (error) break; nstart = tmp; if (nstart < prev->vm_end) nstart = prev->vm_end; if (nstart >= end) break; vma = prev->vm_next; if (!vma || vma->vm_start != nstart) { error = -ENOMEM; break; } } return error; } /* * __mm_populate - populate and/or mlock pages within a range of address space. * * This is used to implement mlock() and the MAP_POPULATE / MAP_LOCKED mmap * flags. VMAs must be already marked with the desired vm_flags, and * mmap_sem must not be held. */ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors) { struct mm_struct *mm = current->mm; unsigned long end, nstart, nend; struct vm_area_struct *vma = NULL; int locked = 0; long ret = 0; VM_BUG_ON(start & ~PAGE_MASK); VM_BUG_ON(len != PAGE_ALIGN(len)); end = start + len; for (nstart = start; nstart < end; nstart = nend) { /* * We want to fault in pages for [nstart; end) address range. * Find first corresponding VMA. */ if (!locked) { locked = 1; down_read(&mm->mmap_sem); vma = find_vma(mm, nstart); } else if (nstart >= vma->vm_end) vma = vma->vm_next; if (!vma || vma->vm_start >= end) break; /* * Set [nstart; nend) to intersection of desired address * range with the first VMA. Also, skip undesirable VMA types. */ nend = min(end, vma->vm_end); if ((vma->vm_flags & (VM_IO | VM_PFNMAP | VM_POPULATE)) != VM_POPULATE) continue; if (nstart < vma->vm_start) nstart = vma->vm_start; /* * Now fault in a range of pages. __mlock_vma_pages_range() * double checks the vma flags, so that it won't mlock pages * if the vma was already munlocked. */ ret = __mlock_vma_pages_range(vma, nstart, nend, &locked); if (ret < 0) { if (ignore_errors) { ret = 0; continue; /* continue at next VMA */ } ret = __mlock_posix_error_return(ret); break; } nend = nstart + ret * PAGE_SIZE; ret = 0; } if (locked) up_read(&mm->mmap_sem); return ret; /* 0 or negative error code */ } SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len) { unsigned long locked; unsigned long lock_limit; int error = -ENOMEM; if (!can_do_mlock()) return -EPERM; lru_add_drain_all(); /* flush pagevec */ down_write(¤t->mm->mmap_sem); len = PAGE_ALIGN(len + (start & ~PAGE_MASK)); start &= PAGE_MASK; locked = len >> PAGE_SHIFT; locked += current->mm->locked_vm; lock_limit = rlimit(RLIMIT_MEMLOCK); lock_limit >>= PAGE_SHIFT; /* check against resource limits */ if ((locked <= lock_limit) || capable(CAP_IPC_LOCK)) error = do_mlock(start, len, 1); up_write(¤t->mm->mmap_sem); if (!error) error = __mm_populate(start, len, 0); return error; } SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len) { int ret; down_write(¤t->mm->mmap_sem); len = PAGE_ALIGN(len + (start & ~PAGE_MASK)); start &= PAGE_MASK; ret = do_mlock(start, len, 0); up_write(¤t->mm->mmap_sem); return ret; } static int do_mlockall(int flags) { struct vm_area_struct * vma, * prev = NULL; if (flags & MCL_FUTURE) current->mm->def_flags |= VM_LOCKED | VM_POPULATE; else current->mm->def_flags &= ~(VM_LOCKED | VM_POPULATE); if (flags == MCL_FUTURE) goto out; for (vma = current->mm->mmap; vma ; vma = prev->vm_next) { vm_flags_t newflags; newflags = vma->vm_flags & ~VM_LOCKED; if (flags & MCL_CURRENT) newflags |= VM_LOCKED | VM_POPULATE; /* Ignore errors */ mlock_fixup(vma, &prev, vma->vm_start, vma->vm_end, newflags); } out: return 0; } SYSCALL_DEFINE1(mlockall, int, flags) { unsigned long lock_limit; int ret = -EINVAL; if (!flags || (flags & ~(MCL_CURRENT | MCL_FUTURE))) goto out; ret = -EPERM; if (!can_do_mlock()) goto out; if (flags & MCL_CURRENT) lru_add_drain_all(); /* flush pagevec */ down_write(¤t->mm->mmap_sem); lock_limit = rlimit(RLIMIT_MEMLOCK); lock_limit >>= PAGE_SHIFT; ret = -ENOMEM; if (!(flags & MCL_CURRENT) || (current->mm->total_vm <= lock_limit) || capable(CAP_IPC_LOCK)) ret = do_mlockall(flags); up_write(¤t->mm->mmap_sem); if (!ret && (flags & MCL_CURRENT)) mm_populate(0, TASK_SIZE); out: return ret; } SYSCALL_DEFINE0(munlockall) { int ret; down_write(¤t->mm->mmap_sem); ret = do_mlockall(0); up_write(¤t->mm->mmap_sem); return ret; } /* * Objects with different lifetime than processes (SHM_LOCK and SHM_HUGETLB * shm segments) get accounted against the user_struct instead. */ static DEFINE_SPINLOCK(shmlock_user_lock); int user_shm_lock(size_t size, struct user_struct *user) { unsigned long lock_limit, locked; int allowed = 0; locked = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; lock_limit = rlimit(RLIMIT_MEMLOCK); if (lock_limit == RLIM_INFINITY) allowed = 1; lock_limit >>= PAGE_SHIFT; spin_lock(&shmlock_user_lock); if (!allowed && locked + user->locked_shm > lock_limit && !capable(CAP_IPC_LOCK)) goto out; get_uid(user); user->locked_shm += locked; allowed = 1; out: spin_unlock(&shmlock_user_lock); return allowed; } void user_shm_unlock(size_t size, struct user_struct *user) { spin_lock(&shmlock_user_lock); user->locked_shm -= (size + PAGE_SIZE - 1) >> PAGE_SHIFT; spin_unlock(&shmlock_user_lock); free_uid(user); }