The patch titled
Subject: mm: isolate mmap internal logic to mm/vma.c
has been added to the -mm mm-unstable branch. Its filename is
mm-isolate-mmap-internal-logic-to-mm-vmac.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-isolate-mmap-internal-logic-to-mm-vmac.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Subject: mm: isolate mmap internal logic to mm/vma.c
Date: Fri, 25 Oct 2024 13:26:24 +0100
In previous commits we effected improvements to the mmap() logic in
mmap_region() and its newly introduced internal implementation function
__mmap_region().
However as these changes are intended to be backported, we kept the delta
as small as is possible and made as few changes as possible to the newly
introduced mm/vma.* files.
Take the opportunity to move this logic to mm/vma.c which not only
isolates it, but also makes it available for later userland testing which
can help us catch such logic errors far earlier.
Link: https://lkml.kernel.org/r/93fc2c3aa37dd30590b7e4ee067dfd832007bf7e.1729858176.git.lorenzo.stoakes@xxxxxxxxxx
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 234 -------------------------------
mm/vma.c | 323 +++++++++++++++++++++++++++++++++++++++++++-
mm/vma.h | 97 -------------
mm/vma_internal.h | 5
4 files changed, 329 insertions(+), 330 deletions(-)
--- a/mm/mmap.c~mm-isolate-mmap-internal-logic-to-mm-vmac
+++ a/mm/mmap.c
@@ -577,22 +577,6 @@ SYSCALL_DEFINE1(old_mmap, struct mmap_ar
}
#endif /* __ARCH_WANT_SYS_OLD_MMAP */
-/*
- * We account for memory if it's a private writeable mapping,
- * not hugepages and VM_NORESERVE wasn't set.
- */
-static inline bool accountable_mapping(struct file *file, vm_flags_t vm_flags)
-{
- /*
- * hugetlb has its own accounting separate from the core VM
- * VM_HUGETLB may not be set yet so we cannot check for that flag.
- */
- if (file && is_file_hugepages(file))
- return false;
-
- return (vm_flags & (VM_NORESERVE | VM_SHARED | VM_WRITE)) == VM_WRITE;
-}
-
/**
* unmapped_area() - Find an area between the low_limit and the high_limit with
* the correct alignment and offset, all from @info. Note: current->mm is used
@@ -1361,224 +1345,6 @@ int do_munmap(struct mm_struct *mm, unsi
return do_vmi_munmap(&vmi, mm, start, len, uf, false);
}
-static unsigned long __mmap_region(struct file *file, unsigned long addr,
- unsigned long len, vm_flags_t vm_flags, unsigned long pgoff,
- struct list_head *uf)
-{
- struct mm_struct *mm = current->mm;
- struct vm_area_struct *vma = NULL;
- pgoff_t pglen = PHYS_PFN(len);
- unsigned long charged = 0;
- struct vma_munmap_struct vms;
- struct ma_state mas_detach;
- struct maple_tree mt_detach;
- unsigned long end = addr + len;
- int error;
- VMA_ITERATOR(vmi, mm, addr);
- VMG_STATE(vmg, mm, &vmi, addr, end, vm_flags, pgoff);
-
- vmg.file = file;
- /* Find the first overlapping VMA */
- vma = vma_find(&vmi, end);
- init_vma_munmap(&vms, &vmi, vma, addr, end, uf, /* unlock = */ false);
- if (vma) {
- mt_init_flags(&mt_detach, vmi.mas.tree->ma_flags & MT_FLAGS_LOCK_MASK);
- mt_on_stack(mt_detach);
- mas_init(&mas_detach, &mt_detach, /* addr = */ 0);
- /* Prepare to unmap any existing mapping in the area */
- error = vms_gather_munmap_vmas(&vms, &mas_detach);
- if (error)
- goto gather_failed;
-
- vmg.next = vms.next;
- vmg.prev = vms.prev;
- vma = NULL;
- } else {
- vmg.next = vma_iter_next_rewind(&vmi, &vmg.prev);
- }
-
- /* Check against address space limit. */
- if (!may_expand_vm(mm, vm_flags, pglen - vms.nr_pages)) {
- error = -ENOMEM;
- goto abort_munmap;
- }
-
- /*
- * Private writable mapping: check memory availability
- */
- if (accountable_mapping(file, vm_flags)) {
- charged = pglen;
- charged -= vms.nr_accounted;
- if (charged) {
- error = security_vm_enough_memory_mm(mm, charged);
- if (error)
- goto abort_munmap;
- }
-
- vms.nr_accounted = 0;
- vm_flags |= VM_ACCOUNT;
- vmg.flags = vm_flags;
- }
-
- /*
- * clear PTEs while the vma is still in the tree so that rmap
- * cannot race with the freeing later in the truncate scenario.
- * This is also needed for mmap_file(), which is why vm_ops
- * close function is called.
- */
- vms_clean_up_area(&vms, &mas_detach);
- vma = vma_merge_new_range(&vmg);
- if (vma)
- goto expanded;
- /*
- * Determine the object being mapped and call the appropriate
- * specific mapper. the address has already been validated, but
- * not unmapped, but the maps are removed from the list.
- */
- vma = vm_area_alloc(mm);
- if (!vma) {
- error = -ENOMEM;
- goto unacct_error;
- }
-
- vma_iter_config(&vmi, addr, end);
- vma_set_range(vma, addr, end, pgoff);
- vm_flags_init(vma, vm_flags);
- vma->vm_page_prot = vm_get_page_prot(vm_flags);
-
- if (vma_iter_prealloc(&vmi, vma)) {
- error = -ENOMEM;
- goto free_vma;
- }
-
- if (file) {
- vma->vm_file = get_file(file);
- error = mmap_file(file, vma);
- if (error)
- goto unmap_and_free_file_vma;
-
- /* Drivers cannot alter the address of the VMA. */
- WARN_ON_ONCE(addr != vma->vm_start);
- /*
- * Drivers should not permit writability when previously it was
- * disallowed.
- */
- VM_WARN_ON_ONCE(vm_flags != vma->vm_flags &&
- !(vm_flags & VM_MAYWRITE) &&
- (vma->vm_flags & VM_MAYWRITE));
-
- vma_iter_config(&vmi, addr, end);
- /*
- * If vm_flags changed after mmap_file(), we should try merge
- * vma again as we may succeed this time.
- */
- if (unlikely(vm_flags != vma->vm_flags && vmg.prev)) {
- struct vm_area_struct *merge;
-
- vmg.flags = vma->vm_flags;
- /* If this fails, state is reset ready for a reattempt. */
- merge = vma_merge_new_range(&vmg);
-
- if (merge) {
- /*
- * ->mmap() can change vma->vm_file and fput
- * the original file. So fput the vma->vm_file
- * here or we would add an extra fput for file
- * and cause general protection fault
- * ultimately.
- */
- fput(vma->vm_file);
- vm_area_free(vma);
- vma = merge;
- /* Update vm_flags to pick up the change. */
- vm_flags = vma->vm_flags;
- goto file_expanded;
- }
- vma_iter_config(&vmi, addr, end);
- }
-
- vm_flags = vma->vm_flags;
- } else if (vm_flags & VM_SHARED) {
- error = shmem_zero_setup(vma);
- if (error)
- goto free_iter_vma;
- } else {
- vma_set_anonymous(vma);
- }
-
-#ifdef CONFIG_SPARC64
- /* TODO: Fix SPARC ADI! */
- WARN_ON_ONCE(!arch_validate_flags(vm_flags));
-#endif
-
- /* Lock the VMA since it is modified after insertion into VMA tree */
- vma_start_write(vma);
- vma_iter_store(&vmi, vma);
- mm->map_count++;
- vma_link_file(vma);
-
- /*
- * vma_merge_new_range() calls khugepaged_enter_vma() too, the below
- * call covers the non-merge case.
- */
- khugepaged_enter_vma(vma, vma->vm_flags);
-
-file_expanded:
- file = vma->vm_file;
- ksm_add_vma(vma);
-expanded:
- perf_event_mmap(vma);
-
- /* Unmap any existing mapping in the area */
- vms_complete_munmap_vmas(&vms, &mas_detach);
-
- vm_stat_account(mm, vm_flags, pglen);
- if (vm_flags & VM_LOCKED) {
- if ((vm_flags & VM_SPECIAL) || vma_is_dax(vma) ||
- is_vm_hugetlb_page(vma) ||
- vma == get_gate_vma(current->mm))
- vm_flags_clear(vma, VM_LOCKED_MASK);
- else
- mm->locked_vm += pglen;
- }
-
- if (file)
- uprobe_mmap(vma);
-
- /*
- * New (or expanded) vma always get soft dirty status.
- * Otherwise user-space soft-dirty page tracker won't
- * be able to distinguish situation when vma area unmapped,
- * then new mapped in-place (which must be aimed as
- * a completely new data area).
- */
- vm_flags_set(vma, VM_SOFTDIRTY);
-
- vma_set_page_prot(vma);
-
- return addr;
-
-unmap_and_free_file_vma:
- fput(vma->vm_file);
- vma->vm_file = NULL;
-
- vma_iter_set(&vmi, vma->vm_end);
- /* Undo any partial mapping done by a device driver. */
- unmap_region(&vmi.mas, vma, vmg.prev, vmg.next);
-free_iter_vma:
- vma_iter_free(&vmi);
-free_vma:
- vm_area_free(vma);
-unacct_error:
- if (charged)
- vm_unacct_memory(charged);
-
-abort_munmap:
- vms_abort_munmap_vmas(&vms, &mas_detach);
-gather_failed:
- return error;
-}
-
unsigned long mmap_region(struct file *file, unsigned long addr,
unsigned long len, vm_flags_t vm_flags, unsigned long pgoff,
struct list_head *uf)
--- a/mm/vma.c~mm-isolate-mmap-internal-logic-to-mm-vmac
+++ a/mm/vma.c
@@ -1103,7 +1103,7 @@ static inline void vms_clear_ptes(struct
vms->clear_ptes = false;
}
-void vms_clean_up_area(struct vma_munmap_struct *vms,
+static void vms_clean_up_area(struct vma_munmap_struct *vms,
struct ma_state *mas_detach)
{
struct vm_area_struct *vma;
@@ -1126,7 +1126,7 @@ void vms_clean_up_area(struct vma_munmap
* used for the munmap() and may downgrade the lock - if requested. Everything
* needed to be done once the vma maple tree is updated.
*/
-void vms_complete_munmap_vmas(struct vma_munmap_struct *vms,
+static void vms_complete_munmap_vmas(struct vma_munmap_struct *vms,
struct ma_state *mas_detach)
{
struct vm_area_struct *vma;
@@ -1168,6 +1168,23 @@ void vms_complete_munmap_vmas(struct vma
}
/*
+ * reattach_vmas() - Undo any munmap work and free resources
+ * @mas_detach: The maple state with the detached maple tree
+ *
+ * Reattach any detached vmas and free up the maple tree used to track the vmas.
+ */
+static void reattach_vmas(struct ma_state *mas_detach)
+{
+ struct vm_area_struct *vma;
+
+ mas_set(mas_detach, 0);
+ mas_for_each(mas_detach, vma, ULONG_MAX)
+ vma_mark_detached(vma, false);
+
+ __mt_destroy(mas_detach->tree);
+}
+
+/*
* vms_gather_munmap_vmas() - Put all VMAs within a range into a maple tree
* for removal at a later date. Handles splitting first and last if necessary
* and marking the vmas as isolated.
@@ -1177,7 +1194,7 @@ void vms_complete_munmap_vmas(struct vma
*
* Return: 0 on success, error otherwise
*/
-int vms_gather_munmap_vmas(struct vma_munmap_struct *vms,
+static int vms_gather_munmap_vmas(struct vma_munmap_struct *vms,
struct ma_state *mas_detach)
{
struct vm_area_struct *next = NULL;
@@ -1316,6 +1333,39 @@ map_count_exceeded:
}
/*
+ * init_vma_munmap() - Initializer wrapper for vma_munmap_struct
+ * @vms: The vma munmap struct
+ * @vmi: The vma iterator
+ * @vma: The first vm_area_struct to munmap
+ * @start: The aligned start address to munmap
+ * @end: The aligned end address to munmap
+ * @uf: The userfaultfd list_head
+ * @unlock: Unlock after the operation. Only unlocked on success
+ */
+static void init_vma_munmap(struct vma_munmap_struct *vms,
+ struct vma_iterator *vmi, struct vm_area_struct *vma,
+ unsigned long start, unsigned long end, struct list_head *uf,
+ bool unlock)
+{
+ vms->vmi = vmi;
+ vms->vma = vma;
+ if (vma) {
+ vms->start = start;
+ vms->end = end;
+ } else {
+ vms->start = vms->end = 0;
+ }
+ vms->unlock = unlock;
+ vms->uf = uf;
+ vms->vma_count = 0;
+ vms->nr_pages = vms->locked_vm = vms->nr_accounted = 0;
+ vms->exec_vm = vms->stack_vm = vms->data_vm = 0;
+ vms->unmap_start = FIRST_USER_ADDRESS;
+ vms->unmap_end = USER_PGTABLES_CEILING;
+ vms->clear_ptes = false;
+}
+
+/*
* do_vmi_align_munmap() - munmap the aligned region from @start to @end.
* @vmi: The vma iterator
* @vma: The starting vm_area_struct
@@ -2069,3 +2119,270 @@ void mm_drop_all_locks(struct mm_struct
mutex_unlock(&mm_all_locks_mutex);
}
+
+/*
+ * We account for memory if it's a private writeable mapping,
+ * not hugepages and VM_NORESERVE wasn't set.
+ */
+static bool accountable_mapping(struct file *file, vm_flags_t vm_flags)
+{
+ /*
+ * hugetlb has its own accounting separate from the core VM
+ * VM_HUGETLB may not be set yet so we cannot check for that flag.
+ */
+ if (file && is_file_hugepages(file))
+ return false;
+
+ return (vm_flags & (VM_NORESERVE | VM_SHARED | VM_WRITE)) == VM_WRITE;
+}
+
+/*
+ * vms_abort_munmap_vmas() - Undo as much as possible from an aborted munmap()
+ * operation.
+ * @vms: The vma unmap structure
+ * @mas_detach: The maple state with the detached maple tree
+ *
+ * Reattach any detached vmas, free up the maple tree used to track the vmas.
+ * If that's not possible because the ptes are cleared (and vm_ops->closed() may
+ * have been called), then a NULL is written over the vmas and the vmas are
+ * removed (munmap() completed).
+ */
+static void vms_abort_munmap_vmas(struct vma_munmap_struct *vms,
+ struct ma_state *mas_detach)
+{
+ struct ma_state *mas = &vms->vmi->mas;
+
+ if (!vms->nr_pages)
+ return;
+
+ if (vms->clear_ptes)
+ return reattach_vmas(mas_detach);
+
+ /*
+ * Aborting cannot just call the vm_ops open() because they are often
+ * not symmetrical and state data has been lost. Resort to the old
+ * failure method of leaving a gap where the MAP_FIXED mapping failed.
+ */
+ mas_set_range(mas, vms->start, vms->end - 1);
+ mas_store_gfp(mas, NULL, GFP_KERNEL|__GFP_NOFAIL);
+ /* Clean up the insertion of the unfortunate gap */
+ vms_complete_munmap_vmas(vms, mas_detach);
+}
+
+unsigned long __mmap_region(struct file *file, unsigned long addr,
+ unsigned long len, vm_flags_t vm_flags, unsigned long pgoff,
+ struct list_head *uf)
+{
+ struct mm_struct *mm = current->mm;
+ struct vm_area_struct *vma = NULL;
+ pgoff_t pglen = PHYS_PFN(len);
+ unsigned long charged = 0;
+ struct vma_munmap_struct vms;
+ struct ma_state mas_detach;
+ struct maple_tree mt_detach;
+ unsigned long end = addr + len;
+ int error;
+ VMA_ITERATOR(vmi, mm, addr);
+ VMG_STATE(vmg, mm, &vmi, addr, end, vm_flags, pgoff);
+
+ vmg.file = file;
+ /* Find the first overlapping VMA */
+ vma = vma_find(&vmi, end);
+ init_vma_munmap(&vms, &vmi, vma, addr, end, uf, /* unlock = */ false);
+ if (vma) {
+ mt_init_flags(&mt_detach, vmi.mas.tree->ma_flags & MT_FLAGS_LOCK_MASK);
+ mt_on_stack(mt_detach);
+ mas_init(&mas_detach, &mt_detach, /* addr = */ 0);
+ /* Prepare to unmap any existing mapping in the area */
+ error = vms_gather_munmap_vmas(&vms, &mas_detach);
+ if (error)
+ goto gather_failed;
+
+ vmg.next = vms.next;
+ vmg.prev = vms.prev;
+ vma = NULL;
+ } else {
+ vmg.next = vma_iter_next_rewind(&vmi, &vmg.prev);
+ }
+
+ /* Check against address space limit. */
+ if (!may_expand_vm(mm, vm_flags, pglen - vms.nr_pages)) {
+ error = -ENOMEM;
+ goto abort_munmap;
+ }
+
+ /*
+ * Private writable mapping: check memory availability
+ */
+ if (accountable_mapping(file, vm_flags)) {
+ charged = pglen;
+ charged -= vms.nr_accounted;
+ if (charged) {
+ error = security_vm_enough_memory_mm(mm, charged);
+ if (error)
+ goto abort_munmap;
+ }
+
+ vms.nr_accounted = 0;
+ vm_flags |= VM_ACCOUNT;
+ vmg.flags = vm_flags;
+ }
+
+ /*
+ * clear PTEs while the vma is still in the tree so that rmap
+ * cannot race with the freeing later in the truncate scenario.
+ * This is also needed for mmap_file(), which is why vm_ops
+ * close function is called.
+ */
+ vms_clean_up_area(&vms, &mas_detach);
+ vma = vma_merge_new_range(&vmg);
+ if (vma)
+ goto expanded;
+ /*
+ * Determine the object being mapped and call the appropriate
+ * specific mapper. the address has already been validated, but
+ * not unmapped, but the maps are removed from the list.
+ */
+ vma = vm_area_alloc(mm);
+ if (!vma) {
+ error = -ENOMEM;
+ goto unacct_error;
+ }
+
+ vma_iter_config(&vmi, addr, end);
+ vma_set_range(vma, addr, end, pgoff);
+ vm_flags_init(vma, vm_flags);
+ vma->vm_page_prot = vm_get_page_prot(vm_flags);
+
+ if (vma_iter_prealloc(&vmi, vma)) {
+ error = -ENOMEM;
+ goto free_vma;
+ }
+
+ if (file) {
+ vma->vm_file = get_file(file);
+ error = mmap_file(file, vma);
+ if (error)
+ goto unmap_and_free_file_vma;
+
+ /* Drivers cannot alter the address of the VMA. */
+ WARN_ON_ONCE(addr != vma->vm_start);
+ /*
+ * Drivers should not permit writability when previously it was
+ * disallowed.
+ */
+ VM_WARN_ON_ONCE(vm_flags != vma->vm_flags &&
+ !(vm_flags & VM_MAYWRITE) &&
+ (vma->vm_flags & VM_MAYWRITE));
+
+ vma_iter_config(&vmi, addr, end);
+ /*
+ * If vm_flags changed after mmap_file(), we should try merge
+ * vma again as we may succeed this time.
+ */
+ if (unlikely(vm_flags != vma->vm_flags && vmg.prev)) {
+ struct vm_area_struct *merge;
+
+ vmg.flags = vma->vm_flags;
+ /* If this fails, state is reset ready for a reattempt. */
+ merge = vma_merge_new_range(&vmg);
+
+ if (merge) {
+ /*
+ * ->mmap() can change vma->vm_file and fput
+ * the original file. So fput the vma->vm_file
+ * here or we would add an extra fput for file
+ * and cause general protection fault
+ * ultimately.
+ */
+ fput(vma->vm_file);
+ vm_area_free(vma);
+ vma = merge;
+ /* Update vm_flags to pick up the change. */
+ vm_flags = vma->vm_flags;
+ goto file_expanded;
+ }
+ vma_iter_config(&vmi, addr, end);
+ }
+
+ vm_flags = vma->vm_flags;
+ } else if (vm_flags & VM_SHARED) {
+ error = shmem_zero_setup(vma);
+ if (error)
+ goto free_iter_vma;
+ } else {
+ vma_set_anonymous(vma);
+ }
+
+#ifdef CONFIG_SPARC64
+ /* TODO: Fix SPARC ADI! */
+ WARN_ON_ONCE(!arch_validate_flags(vm_flags));
+#endif
+
+ /* Lock the VMA since it is modified after insertion into VMA tree */
+ vma_start_write(vma);
+ vma_iter_store(&vmi, vma);
+ mm->map_count++;
+ vma_link_file(vma);
+
+ /*
+ * vma_merge_new_range() calls khugepaged_enter_vma() too, the below
+ * call covers the non-merge case.
+ */
+ khugepaged_enter_vma(vma, vma->vm_flags);
+
+file_expanded:
+ file = vma->vm_file;
+ ksm_add_vma(vma);
+expanded:
+ perf_event_mmap(vma);
+
+ /* Unmap any existing mapping in the area */
+ vms_complete_munmap_vmas(&vms, &mas_detach);
+
+ vm_stat_account(mm, vm_flags, pglen);
+ if (vm_flags & VM_LOCKED) {
+ if ((vm_flags & VM_SPECIAL) || vma_is_dax(vma) ||
+ is_vm_hugetlb_page(vma) ||
+ vma == get_gate_vma(current->mm))
+ vm_flags_clear(vma, VM_LOCKED_MASK);
+ else
+ mm->locked_vm += pglen;
+ }
+
+ if (file)
+ uprobe_mmap(vma);
+
+ /*
+ * New (or expanded) vma always get soft dirty status.
+ * Otherwise user-space soft-dirty page tracker won't
+ * be able to distinguish situation when vma area unmapped,
+ * then new mapped in-place (which must be aimed as
+ * a completely new data area).
+ */
+ vm_flags_set(vma, VM_SOFTDIRTY);
+
+ vma_set_page_prot(vma);
+
+ return addr;
+
+unmap_and_free_file_vma:
+ fput(vma->vm_file);
+ vma->vm_file = NULL;
+
+ vma_iter_set(&vmi, vma->vm_end);
+ /* Undo any partial mapping done by a device driver. */
+ unmap_region(&vmi.mas, vma, vmg.prev, vmg.next);
+free_iter_vma:
+ vma_iter_free(&vmi);
+free_vma:
+ vm_area_free(vma);
+unacct_error:
+ if (charged)
+ vm_unacct_memory(charged);
+
+abort_munmap:
+ vms_abort_munmap_vmas(&vms, &mas_detach);
+gather_failed:
+ return error;
+}
--- a/mm/vma.h~mm-isolate-mmap-internal-logic-to-mm-vmac
+++ a/mm/vma.h
@@ -165,99 +165,6 @@ static inline int vma_iter_store_gfp(str
return 0;
}
-#ifdef CONFIG_MMU
-/*
- * init_vma_munmap() - Initializer wrapper for vma_munmap_struct
- * @vms: The vma munmap struct
- * @vmi: The vma iterator
- * @vma: The first vm_area_struct to munmap
- * @start: The aligned start address to munmap
- * @end: The aligned end address to munmap
- * @uf: The userfaultfd list_head
- * @unlock: Unlock after the operation. Only unlocked on success
- */
-static inline void init_vma_munmap(struct vma_munmap_struct *vms,
- struct vma_iterator *vmi, struct vm_area_struct *vma,
- unsigned long start, unsigned long end, struct list_head *uf,
- bool unlock)
-{
- vms->vmi = vmi;
- vms->vma = vma;
- if (vma) {
- vms->start = start;
- vms->end = end;
- } else {
- vms->start = vms->end = 0;
- }
- vms->unlock = unlock;
- vms->uf = uf;
- vms->vma_count = 0;
- vms->nr_pages = vms->locked_vm = vms->nr_accounted = 0;
- vms->exec_vm = vms->stack_vm = vms->data_vm = 0;
- vms->unmap_start = FIRST_USER_ADDRESS;
- vms->unmap_end = USER_PGTABLES_CEILING;
- vms->clear_ptes = false;
-}
-#endif
-
-int vms_gather_munmap_vmas(struct vma_munmap_struct *vms,
- struct ma_state *mas_detach);
-
-void vms_complete_munmap_vmas(struct vma_munmap_struct *vms,
- struct ma_state *mas_detach);
-
-void vms_clean_up_area(struct vma_munmap_struct *vms,
- struct ma_state *mas_detach);
-
-/*
- * reattach_vmas() - Undo any munmap work and free resources
- * @mas_detach: The maple state with the detached maple tree
- *
- * Reattach any detached vmas and free up the maple tree used to track the vmas.
- */
-static inline void reattach_vmas(struct ma_state *mas_detach)
-{
- struct vm_area_struct *vma;
-
- mas_set(mas_detach, 0);
- mas_for_each(mas_detach, vma, ULONG_MAX)
- vma_mark_detached(vma, false);
-
- __mt_destroy(mas_detach->tree);
-}
-
-/*
- * vms_abort_munmap_vmas() - Undo as much as possible from an aborted munmap()
- * operation.
- * @vms: The vma unmap structure
- * @mas_detach: The maple state with the detached maple tree
- *
- * Reattach any detached vmas, free up the maple tree used to track the vmas.
- * If that's not possible because the ptes are cleared (and vm_ops->closed() may
- * have been called), then a NULL is written over the vmas and the vmas are
- * removed (munmap() completed).
- */
-static inline void vms_abort_munmap_vmas(struct vma_munmap_struct *vms,
- struct ma_state *mas_detach)
-{
- struct ma_state *mas = &vms->vmi->mas;
- if (!vms->nr_pages)
- return;
-
- if (vms->clear_ptes)
- return reattach_vmas(mas_detach);
-
- /*
- * Aborting cannot just call the vm_ops open() because they are often
- * not symmetrical and state data has been lost. Resort to the old
- * failure method of leaving a gap where the MAP_FIXED mapping failed.
- */
- mas_set_range(mas, vms->start, vms->end - 1);
- mas_store_gfp(mas, NULL, GFP_KERNEL|__GFP_NOFAIL);
- /* Clean up the insertion of the unfortunate gap */
- vms_complete_munmap_vmas(vms, mas_detach);
-}
-
int
do_vmi_align_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma,
struct mm_struct *mm, unsigned long start,
@@ -336,6 +243,10 @@ bool vma_wants_writenotify(struct vm_are
int mm_take_all_locks(struct mm_struct *mm);
void mm_drop_all_locks(struct mm_struct *mm);
+unsigned long __mmap_region(struct file *file, unsigned long addr,
+ unsigned long len, vm_flags_t vm_flags, unsigned long pgoff,
+ struct list_head *uf);
+
static inline bool vma_wants_manual_pte_write_upgrade(struct vm_area_struct *vma)
{
/*
--- a/mm/vma_internal.h~mm-isolate-mmap-internal-logic-to-mm-vmac
+++ a/mm/vma_internal.h
@@ -17,8 +17,10 @@
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/huge_mm.h>
+#include <linux/hugetlb.h>
#include <linux/hugetlb_inline.h>
#include <linux/kernel.h>
+#include <linux/ksm.h>
#include <linux/khugepaged.h>
#include <linux/list.h>
#include <linux/maple_tree.h>
@@ -32,11 +34,14 @@
#include <linux/mmu_context.h>
#include <linux/mutex.h>
#include <linux/pagemap.h>
+#include <linux/perf_event.h>
#include <linux/pfn.h>
#include <linux/rcupdate.h>
#include <linux/rmap.h>
#include <linux/rwsem.h>
#include <linux/sched/signal.h>
+#include <linux/security.h>
+#include <linux/shmem_fs.h>
#include <linux/swap.h>
#include <linux/uprobes.h>
#include <linux/userfaultfd_k.h>
_
Patches currently in -mm which might be from lorenzo.stoakes@xxxxxxxxxx are
mm-avoid-unsafe-vma-hook-invocation-when-error-arises-on-mmap-hook.patch
mm-unconditionally-close-vmas-on-error.patch
mm-refactor-map_deny_write_exec.patch
mm-resolve-faulty-mmap_region-error-path-behaviour.patch
selftests-mm-add-pkey_sighandler_xx-hugetlb_dio-to-gitignore.patch
mm-refactor-mm_access-to-not-return-null.patch
mm-refactor-mm_access-to-not-return-null-fix.patch
mm-madvise-unrestrict-process_madvise-for-current-process.patch
maple_tree-do-not-hash-pointers-on-dump-in-debug-mode.patch
tools-testing-fix-phys_addr_t-size-on-64-bit-systems.patch
tools-testing-fix-phys_addr_t-size-on-64-bit-systems-fix.patch
tools-testing-add-additional-vma_internalh-stubs.patch
mm-isolate-mmap-internal-logic-to-mm-vmac.patch
mm-refactor-__mmap_region.patch
mm-remove-unnecessary-reset-state-logic-on-merge-new-vma.patch
mm-defer-second-attempt-at-merge-on-mmap.patch
mm-pagewalk-add-the-ability-to-install-ptes.patch
mm-add-pte_marker_guard-pte-marker.patch
mm-madvise-implement-lightweight-guard-page-mechanism.patch
mm-madvise-implement-lightweight-guard-page-mechanism-fix.patch
tools-testing-update-tools-uapi-header-for-mman-commonh.patch
selftests-mm-add-self-tests-for-guard-page-feature.patch
