// SPDX-License-Identifier: GPL-2.0 /* * mm/mremap.c * * (C) Copyright 1996 Linus Torvalds * * Address space accounting code * (C) Copyright 2002 Red Hat Inc, All Rights Reserved */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "internal.h" static pud_t *get_old_pud(struct mm_struct *mm, unsigned long addr) { pgd_t *pgd; p4d_t *p4d; pud_t *pud; pgd = pgd_offset(mm, addr); if (pgd_none_or_clear_bad(pgd)) return NULL; p4d = p4d_offset(pgd, addr); if (p4d_none_or_clear_bad(p4d)) return NULL; pud = pud_offset(p4d, addr); if (pud_none_or_clear_bad(pud)) return NULL; return pud; } static pmd_t *get_old_pmd(struct mm_struct *mm, unsigned long addr) { pud_t *pud; pmd_t *pmd; pud = get_old_pud(mm, addr); if (!pud) return NULL; pmd = pmd_offset(pud, addr); if (pmd_none(*pmd)) return NULL; return pmd; } static pud_t *alloc_new_pud(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr) { pgd_t *pgd; p4d_t *p4d; pgd = pgd_offset(mm, addr); p4d = p4d_alloc(mm, pgd, addr); if (!p4d) return NULL; return pud_alloc(mm, p4d, addr); } static pmd_t *alloc_new_pmd(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr) { pud_t *pud; pmd_t *pmd; pud = alloc_new_pud(mm, vma, addr); if (!pud) return NULL; pmd = pmd_alloc(mm, pud, addr); if (!pmd) return NULL; VM_BUG_ON(pmd_trans_huge(*pmd)); return pmd; } static void take_rmap_locks(struct vm_area_struct *vma) { if (vma->vm_file) i_mmap_lock_write(vma->vm_file->f_mapping); if (vma->anon_vma) anon_vma_lock_write(vma->anon_vma); } static void drop_rmap_locks(struct vm_area_struct *vma) { if (vma->anon_vma) anon_vma_unlock_write(vma->anon_vma); if (vma->vm_file) i_mmap_unlock_write(vma->vm_file->f_mapping); } static pte_t move_soft_dirty_pte(pte_t pte) { /* * Set soft dirty bit so we can notice * in userspace the ptes were moved. */ #ifdef CONFIG_MEM_SOFT_DIRTY if (pte_present(pte)) pte = pte_mksoft_dirty(pte); else if (is_swap_pte(pte)) pte = pte_swp_mksoft_dirty(pte); #endif return pte; } 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, bool need_rmap_locks) { struct mm_struct *mm = vma->vm_mm; pte_t *old_pte, *new_pte, pte; spinlock_t *old_ptl, *new_ptl; bool force_flush = false; unsigned long len = old_end - old_addr; /* * When need_rmap_locks is true, we take the i_mmap_rwsem and anon_vma * locks to ensure that rmap will always observe either the old or the * new ptes. This is the easiest way to avoid races with * truncate_pagecache(), page migration, etc... * * When need_rmap_locks is false, we use other ways to avoid * such races: * * - During exec() shift_arg_pages(), we use a specially tagged vma * which rmap call sites look for using vma_is_temporary_stack(). * * - During mremap(), new_vma is often known to be placed after vma * in rmap traversal order. This ensures rmap will always observe * either the old pte, or the new pte, or both (the page table locks * serialize access to individual ptes, but only rmap traversal * order guarantees that we won't miss both the old and new ptes). */ if (need_rmap_locks) take_rmap_locks(vma); /* * We don't have to worry about the ordering of src and dst * pte locks because exclusive mmap_lock prevents deadlock. */ old_pte = pte_offset_map_lock(mm, old_pmd, old_addr, &old_ptl); new_pte = pte_offset_map(new_pmd, new_addr); new_ptl = pte_lockptr(mm, new_pmd); if (new_ptl != old_ptl) spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING); flush_tlb_batched_pending(vma->vm_mm); arch_enter_lazy_mmu_mode(); 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_get_and_clear(mm, old_addr, old_pte); /* * If we are remapping a valid PTE, make sure * to flush TLB before we drop the PTL for the * PTE. * * NOTE! Both old and new PTL matter: the old one * for racing with page_mkclean(), the new one to * make sure the physical page stays valid until * the TLB entry for the old mapping has been * flushed. */ if (pte_present(pte)) force_flush = true; pte = move_pte(pte, new_vma->vm_page_prot, old_addr, new_addr); pte = move_soft_dirty_pte(pte); set_pte_at(mm, new_addr, new_pte, pte); } arch_leave_lazy_mmu_mode(); if (force_flush) flush_tlb_range(vma, old_end - len, old_end); if (new_ptl != old_ptl) spin_unlock(new_ptl); pte_unmap(new_pte - 1); pte_unmap_unlock(old_pte - 1, old_ptl); if (need_rmap_locks) drop_rmap_locks(vma); } #ifdef CONFIG_HAVE_MOVE_PMD static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr, unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd) { spinlock_t *old_ptl, *new_ptl; struct mm_struct *mm = vma->vm_mm; pmd_t pmd; /* * The destination pmd shouldn't be established, free_pgtables() * should have released it. * * However, there's a case during execve() where we use mremap * to move the initial stack, and in that case the target area * may overlap the source area (always moving down). * * If everything is PMD-aligned, that works fine, as moving * each pmd down will clear the source pmd. But if we first * have a few 4kB-only pages that get moved down, and then * hit the "now the rest is PMD-aligned, let's do everything * one pmd at a time", we will still have the old (now empty * of any 4kB pages, but still there) PMD in the page table * tree. * * Warn on it once - because we really should try to figure * out how to do this better - but then say "I won't move * this pmd". * * One alternative might be to just unmap the target pmd at * this point, and verify that it really is empty. We'll see. */ if (WARN_ON_ONCE(!pmd_none(*new_pmd))) return false; /* * We don't have to worry about the ordering of src and dst * ptlocks because exclusive mmap_lock prevents deadlock. */ old_ptl = pmd_lock(vma->vm_mm, old_pmd); new_ptl = pmd_lockptr(mm, new_pmd); if (new_ptl != old_ptl) spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING); /* Clear the pmd */ pmd = *old_pmd; pmd_clear(old_pmd); VM_BUG_ON(!pmd_none(*new_pmd)); /* Set the new pmd */ set_pmd_at(mm, new_addr, new_pmd, pmd); flush_tlb_range(vma, old_addr, old_addr + PMD_SIZE); if (new_ptl != old_ptl) spin_unlock(new_ptl); spin_unlock(old_ptl); return true; } #else static inline bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr, unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd) { return false; } #endif #ifdef CONFIG_HAVE_MOVE_PUD static bool move_normal_pud(struct vm_area_struct *vma, unsigned long old_addr, unsigned long new_addr, pud_t *old_pud, pud_t *new_pud) { spinlock_t *old_ptl, *new_ptl; struct mm_struct *mm = vma->vm_mm; pud_t pud; /* * The destination pud shouldn't be established, free_pgtables() * should have released it. */ if (WARN_ON_ONCE(!pud_none(*new_pud))) return false; /* * We don't have to worry about the ordering of src and dst * ptlocks because exclusive mmap_lock prevents deadlock. */ old_ptl = pud_lock(vma->vm_mm, old_pud); new_ptl = pud_lockptr(mm, new_pud); if (new_ptl != old_ptl) spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING); /* Clear the pud */ pud = *old_pud; pud_clear(old_pud); VM_BUG_ON(!pud_none(*new_pud)); /* Set the new pud */ set_pud_at(mm, new_addr, new_pud, pud); flush_tlb_range(vma, old_addr, old_addr + PUD_SIZE); if (new_ptl != old_ptl) spin_unlock(new_ptl); spin_unlock(old_ptl); return true; } #else static inline bool move_normal_pud(struct vm_area_struct *vma, unsigned long old_addr, unsigned long new_addr, pud_t *old_pud, pud_t *new_pud) { return false; } #endif enum pgt_entry { NORMAL_PMD, HPAGE_PMD, NORMAL_PUD, }; /* * Returns an extent of the corresponding size for the pgt_entry specified if * valid. Else returns a smaller extent bounded by the end of the source and * destination pgt_entry. */ static unsigned long get_extent(enum pgt_entry entry, unsigned long old_addr, unsigned long old_end, unsigned long new_addr) { unsigned long next, extent, mask, size; switch (entry) { case HPAGE_PMD: case NORMAL_PMD: mask = PMD_MASK; size = PMD_SIZE; break; case NORMAL_PUD: mask = PUD_MASK; size = PUD_SIZE; break; default: BUILD_BUG(); break; } next = (old_addr + size) & mask; /* even if next overflowed, extent below will be ok */ extent = next - old_addr; if (extent > old_end - old_addr) extent = old_end - old_addr; next = (new_addr + size) & mask; if (extent > next - new_addr) extent = next - new_addr; return extent; } /* * Attempts to speedup the move by moving entry at the level corresponding to * pgt_entry. Returns true if the move was successful, else false. */ static bool move_pgt_entry(enum pgt_entry entry, struct vm_area_struct *vma, unsigned long old_addr, unsigned long new_addr, void *old_entry, void *new_entry, bool need_rmap_locks) { bool moved = false; /* See comment in move_ptes() */ if (need_rmap_locks) take_rmap_locks(vma); switch (entry) { case NORMAL_PMD: moved = move_normal_pmd(vma, old_addr, new_addr, old_entry, new_entry); break; case NORMAL_PUD: moved = move_normal_pud(vma, old_addr, new_addr, old_entry, new_entry); break; case HPAGE_PMD: moved = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && move_huge_pmd(vma, old_addr, new_addr, old_entry, new_entry); break; default: WARN_ON_ONCE(1); break; } if (need_rmap_locks) drop_rmap_locks(vma); return moved; } unsigned long move_page_tables(struct vm_area_struct *vma, unsigned long old_addr, struct vm_area_struct *new_vma, unsigned long new_addr, unsigned long len, bool need_rmap_locks) { unsigned long extent, old_end; struct mmu_notifier_range range; pmd_t *old_pmd, *new_pmd; old_end = old_addr + len; flush_cache_range(vma, old_addr, old_end); mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, vma->vm_mm, old_addr, old_end); mmu_notifier_invalidate_range_start(&range); for (; old_addr < old_end; old_addr += extent, new_addr += extent) { cond_resched(); /* * If extent is PUD-sized try to speed up the move by moving at the * PUD level if possible. */ extent = get_extent(NORMAL_PUD, old_addr, old_end, new_addr); if (IS_ENABLED(CONFIG_HAVE_MOVE_PUD) && extent == PUD_SIZE) { pud_t *old_pud, *new_pud; old_pud = get_old_pud(vma->vm_mm, old_addr); if (!old_pud) continue; new_pud = alloc_new_pud(vma->vm_mm, vma, new_addr); if (!new_pud) break; if (move_pgt_entry(NORMAL_PUD, vma, old_addr, new_addr, old_pud, new_pud, true)) continue; } extent = get_extent(NORMAL_PMD, old_addr, old_end, new_addr); old_pmd = get_old_pmd(vma->vm_mm, old_addr); if (!old_pmd) continue; new_pmd = alloc_new_pmd(vma->vm_mm, vma, new_addr); if (!new_pmd) break; if (is_swap_pmd(*old_pmd) || pmd_trans_huge(*old_pmd) || pmd_devmap(*old_pmd)) { if (extent == HPAGE_PMD_SIZE && move_pgt_entry(HPAGE_PMD, vma, old_addr, new_addr, old_pmd, new_pmd, need_rmap_locks)) continue; split_huge_pmd(vma, old_pmd, old_addr); if (pmd_trans_unstable(old_pmd)) continue; } else if (IS_ENABLED(CONFIG_HAVE_MOVE_PMD) && extent == PMD_SIZE) { /* * If the extent is PMD-sized, try to speed the move by * moving at the PMD level if possible. */ if (move_pgt_entry(NORMAL_PMD, vma, old_addr, new_addr, old_pmd, new_pmd, true)) continue; } if (pte_alloc(new_vma->vm_mm, new_pmd)) break; move_ptes(vma, old_pmd, old_addr, old_addr + extent, new_vma, new_pmd, new_addr, need_rmap_locks); } mmu_notifier_invalidate_range_end(&range); return len + old_addr - old_end; /* how much done */ } 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, bool *locked, unsigned long flags, struct vm_userfaultfd_ctx *uf, struct list_head *uf_unmap) { 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; unsigned long hiwater_vm; int split = 0; int err; bool need_rmap_locks; /* * 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; /* * 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. */ err = ksm_madvise(vma, old_addr, old_addr + old_len, MADV_UNMERGEABLE, &vm_flags); if (err) return err; new_pgoff = vma->vm_pgoff + ((old_addr - vma->vm_start) >> PAGE_SHIFT); new_vma = copy_vma(&vma, new_addr, new_len, new_pgoff, &need_rmap_locks); if (!new_vma) return -ENOMEM; /* new_vma is returned protected by copy_vma, to prevent speculative * page fault to be done in the destination area before we move the pte. * Now, we must also protect the source VMA since we don't want pages * to be mapped in our back while we are copying the PTEs. */ if (vma != new_vma) vm_write_begin(vma); moved_len = move_page_tables(vma, old_addr, new_vma, new_addr, old_len, need_rmap_locks); if (moved_len < old_len) { err = -ENOMEM; } else if (vma->vm_ops && vma->vm_ops->mremap) { err = vma->vm_ops->mremap(new_vma); } if (unlikely(err)) { /* * 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, true); if (vma != new_vma) vm_write_end(vma); vma = new_vma; old_len = new_len; old_addr = new_addr; new_addr = err; } else { mremap_userfaultfd_prep(new_vma, uf); arch_remap(mm, old_addr, old_addr + old_len, new_addr, new_addr + new_len); if (vma != new_vma) vm_write_end(vma); } vm_write_end(new_vma); /* 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; } /* * 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(). */ hiwater_vm = mm->hiwater_vm; vm_stat_account(mm, vma->vm_flags, new_len >> PAGE_SHIFT); /* Tell pfnmap has moved from this vma */ if (unlikely(vma->vm_flags & VM_PFNMAP)) untrack_pfn_moved(vma); if (unlikely(!err && (flags & MREMAP_DONTUNMAP))) { if (vm_flags & VM_ACCOUNT) { /* Always put back VM_ACCOUNT since we won't unmap */ vma->vm_flags |= VM_ACCOUNT; vm_acct_memory(new_len >> PAGE_SHIFT); } /* * VMAs can actually be merged back together in copy_vma * calling merge_vma. This can happen with anonymous vmas * which have not yet been faulted, so if we were to consider * this VMA split we'll end up adding VM_ACCOUNT on the * next VMA, which is completely unrelated if this VMA * was re-merged. */ if (split && new_vma == vma) split = 0; /* We always clear VM_LOCKED[ONFAULT] on the old vma */ vma->vm_flags &= VM_LOCKED_CLEAR_MASK; /* Because we won't unmap we don't need to touch locked_vm */ goto out; } if (do_munmap(mm, old_addr, old_len, uf_unmap) < 0) { /* OOM: unable to split vma, just get accounts right */ vm_unacct_memory(excess >> PAGE_SHIFT); excess = 0; } if (vm_flags & VM_LOCKED) { mm->locked_vm += new_len >> PAGE_SHIFT; *locked = true; } out: mm->hiwater_vm = hiwater_vm; /* 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; } return new_addr; } static struct vm_area_struct *vma_to_resize(unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, unsigned long *p) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma = find_vma(mm, addr); unsigned long pgoff; if (!vma || vma->vm_start > addr) return ERR_PTR(-EFAULT); /* * !old_len is a special case where an attempt is made to 'duplicate' * a mapping. This makes no sense for private mappings as it will * instead create a fresh/new mapping unrelated to the original. This * is contrary to the basic idea of mremap which creates new mappings * based on the original. There are no known use cases for this * behavior. As a result, fail such attempts. */ if (!old_len && !(vma->vm_flags & (VM_SHARED | VM_MAYSHARE))) { pr_warn_once("%s (%d): attempted to duplicate a private mapping with mremap. This is not supported.\n", current->comm, current->pid); return ERR_PTR(-EINVAL); } if ((flags & MREMAP_DONTUNMAP) && (vma->vm_flags & (VM_DONTEXPAND | VM_PFNMAP))) return ERR_PTR(-EINVAL); if (is_vm_hugetlb_page(vma)) return ERR_PTR(-EINVAL); /* We can't remap across vm area boundaries */ if (old_len > vma->vm_end - addr) return ERR_PTR(-EFAULT); if (new_len == old_len) return vma; /* Need to be careful about a growing mapping */ pgoff = (addr - vma->vm_start) >> PAGE_SHIFT; pgoff += vma->vm_pgoff; if (pgoff + (new_len >> PAGE_SHIFT) < pgoff) return ERR_PTR(-EINVAL); if (vma->vm_flags & (VM_DONTEXPAND | VM_PFNMAP)) return ERR_PTR(-EFAULT); if (vma->vm_flags & VM_LOCKED) { unsigned long locked, lock_limit; locked = mm->locked_vm << PAGE_SHIFT; lock_limit = rlimit(RLIMIT_MEMLOCK); locked += new_len - old_len; if (locked > lock_limit && !capable(CAP_IPC_LOCK)) return ERR_PTR(-EAGAIN); } if (!may_expand_vm(mm, vma->vm_flags, (new_len - old_len) >> PAGE_SHIFT)) return ERR_PTR(-ENOMEM); if (vma->vm_flags & VM_ACCOUNT) { unsigned long charged = (new_len - old_len) >> PAGE_SHIFT; if (security_vm_enough_memory_mm(mm, charged)) return ERR_PTR(-ENOMEM); *p = charged; } return vma; } static unsigned long mremap_to(unsigned long addr, unsigned long old_len, unsigned long new_addr, unsigned long new_len, bool *locked, unsigned long flags, struct vm_userfaultfd_ctx *uf, struct list_head *uf_unmap_early, struct list_head *uf_unmap) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; unsigned long ret = -EINVAL; unsigned long charged = 0; unsigned long map_flags = 0; if (offset_in_page(new_addr)) goto out; if (new_len > TASK_SIZE || new_addr > TASK_SIZE - new_len) goto out; /* Ensure the old/new locations do not overlap */ if (addr + old_len > new_addr && new_addr + new_len > addr) goto out; /* * move_vma() need us to stay 4 maps below the threshold, otherwise * it will bail out at the very beginning. * That is a problem if we have already unmaped the regions here * (new_addr, and old_addr), because userspace will not know the * state of the vma's after it gets -ENOMEM. * So, to avoid such scenario we can pre-compute if the whole * operation has high chances to success map-wise. * Worst-scenario case is when both vma's (new_addr and old_addr) get * split in 3 before unmaping it. * That means 2 more maps (1 for each) to the ones we already hold. * Check whether current map count plus 2 still leads us to 4 maps below * the threshold, otherwise return -ENOMEM here to be more safe. */ if ((mm->map_count + 2) >= sysctl_max_map_count - 3) return -ENOMEM; if (flags & MREMAP_FIXED) { ret = do_munmap(mm, new_addr, new_len, uf_unmap_early); if (ret) goto out; } if (old_len >= new_len) { ret = do_munmap(mm, addr+new_len, old_len - new_len, uf_unmap); if (ret && old_len != new_len) goto out; old_len = new_len; } vma = vma_to_resize(addr, old_len, new_len, flags, &charged); if (IS_ERR(vma)) { ret = PTR_ERR(vma); goto out; } /* MREMAP_DONTUNMAP expands by old_len since old_len == new_len */ if (flags & MREMAP_DONTUNMAP && !may_expand_vm(mm, vma->vm_flags, old_len >> PAGE_SHIFT)) { ret = -ENOMEM; goto out; } if (flags & MREMAP_FIXED) map_flags |= MAP_FIXED; if (vma->vm_flags & VM_MAYSHARE) map_flags |= MAP_SHARED; ret = get_unmapped_area(vma->vm_file, new_addr, new_len, vma->vm_pgoff + ((addr - vma->vm_start) >> PAGE_SHIFT), map_flags); if (IS_ERR_VALUE(ret)) goto out1; /* We got a new mapping */ if (!(flags & MREMAP_FIXED)) new_addr = ret; ret = move_vma(vma, addr, old_len, new_len, new_addr, locked, flags, uf, uf_unmap); if (!(offset_in_page(ret))) goto out; out1: vm_unacct_memory(charged); out: return ret; } static int vma_expandable(struct vm_area_struct *vma, unsigned long delta) { unsigned long end = vma->vm_end + delta; if (end < vma->vm_end) /* overflow */ return 0; if (vma->vm_next && vma->vm_next->vm_start < end) /* intersection */ return 0; if (get_unmapped_area(NULL, vma->vm_start, end - vma->vm_start, 0, MAP_FIXED) & ~PAGE_MASK) return 0; return 1; } /* * 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. */ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, unsigned long, new_len, unsigned long, flags, unsigned long, new_addr) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; unsigned long ret = -EINVAL; unsigned long charged = 0; bool locked = false; bool downgraded = false; struct vm_userfaultfd_ctx uf = NULL_VM_UFFD_CTX; LIST_HEAD(uf_unmap_early); LIST_HEAD(uf_unmap); /* * There is a deliberate asymmetry here: we strip the pointer tag * from the old address but leave the new address alone. This is * for consistency with mmap(), where we prevent the creation of * aliasing mappings in userspace by leaving the tag bits of the * mapping address intact. A non-zero tag will cause the subsequent * range checks to reject the address as invalid. * * See Documentation/arm64/tagged-address-abi.rst for more information. */ addr = untagged_addr(addr); if (flags & ~(MREMAP_FIXED | MREMAP_MAYMOVE | MREMAP_DONTUNMAP)) return ret; if (flags & MREMAP_FIXED && !(flags & MREMAP_MAYMOVE)) return ret; /* * MREMAP_DONTUNMAP is always a move and it does not allow resizing * in the process. */ if (flags & MREMAP_DONTUNMAP && (!(flags & MREMAP_MAYMOVE) || old_len != new_len)) return ret; if (offset_in_page(addr)) return ret; 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) return ret; if (mmap_write_lock_killable(current->mm)) return -EINTR; if (flags & (MREMAP_FIXED | MREMAP_DONTUNMAP)) { ret = mremap_to(addr, old_len, new_addr, new_len, &locked, flags, &uf, &uf_unmap_early, &uf_unmap); goto out; } /* * Always allow a shrinking remap: that just unmaps * the unnecessary pages.. * __do_munmap does all the needed commit accounting, and * downgrades mmap_lock to read if so directed. */ if (old_len >= new_len) { int retval; retval = __do_munmap(mm, addr+new_len, old_len - new_len, &uf_unmap, true); if (retval < 0 && old_len != new_len) { ret = retval; goto out; /* Returning 1 indicates mmap_lock is downgraded to read. */ } else if (retval == 1) downgraded = true; ret = addr; goto out; } /* * Ok, we need to grow.. */ vma = vma_to_resize(addr, old_len, new_len, flags, &charged); if (IS_ERR(vma)) { ret = PTR_ERR(vma); goto out; } /* old_len exactly to the end of the area.. */ if (old_len == vma->vm_end - addr) { /* can we just expand the current mapping? */ if (vma_expandable(vma, new_len - old_len)) { int pages = (new_len - old_len) >> PAGE_SHIFT; if (vma_adjust(vma, vma->vm_start, addr + new_len, vma->vm_pgoff, NULL)) { ret = -ENOMEM; goto out; } vm_stat_account(mm, vma->vm_flags, pages); if (vma->vm_flags & VM_LOCKED) { mm->locked_vm += pages; locked = true; new_addr = addr; } 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) { 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, vma->vm_pgoff + ((addr - vma->vm_start) >> PAGE_SHIFT), map_flags); if (IS_ERR_VALUE(new_addr)) { ret = new_addr; goto out; } ret = move_vma(vma, addr, old_len, new_len, new_addr, &locked, flags, &uf, &uf_unmap); } out: if (offset_in_page(ret)) { vm_unacct_memory(charged); locked = false; } if (downgraded) mmap_read_unlock(current->mm); else mmap_write_unlock(current->mm); if (locked && new_len > old_len) mm_populate(new_addr + old_len, new_len - old_len); userfaultfd_unmap_complete(mm, &uf_unmap_early); mremap_userfaultfd_complete(&uf, addr, ret, old_len); userfaultfd_unmap_complete(mm, &uf_unmap); return ret; }