summaryrefslogtreecommitdiff
path: root/mm/vmalloc.c
diff options
context:
space:
mode:
Diffstat (limited to 'mm/vmalloc.c')
-rw-r--r--mm/vmalloc.c129
1 files changed, 76 insertions, 53 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 4d3b3d60d893..e9681dc4aa75 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1062,6 +1062,26 @@ __alloc_vmap_area(unsigned long size, unsigned long align,
}
/*
+ * Free a region of KVA allocated by alloc_vmap_area
+ */
+static void free_vmap_area(struct vmap_area *va)
+{
+ /*
+ * Remove from the busy tree/list.
+ */
+ spin_lock(&vmap_area_lock);
+ unlink_va(va, &vmap_area_root);
+ spin_unlock(&vmap_area_lock);
+
+ /*
+ * Insert/Merge it back to the free tree/list.
+ */
+ spin_lock(&free_vmap_area_lock);
+ merge_or_add_vmap_area(va, &free_vmap_area_root, &free_vmap_area_list);
+ spin_unlock(&free_vmap_area_lock);
+}
+
+/*
* Allocate a region of KVA of the specified size and alignment, within the
* vstart and vend.
*/
@@ -1073,6 +1093,7 @@ static struct vmap_area *alloc_vmap_area(unsigned long size,
struct vmap_area *va, *pva;
unsigned long addr;
int purged = 0;
+ int ret;
BUG_ON(!size);
BUG_ON(offset_in_page(size));
@@ -1139,6 +1160,7 @@ retry:
va->va_end = addr + size;
va->vm = NULL;
+
spin_lock(&vmap_area_lock);
insert_vmap_area(va, &vmap_area_root, &vmap_area_list);
spin_unlock(&vmap_area_lock);
@@ -1147,6 +1169,12 @@ retry:
BUG_ON(va->va_start < vstart);
BUG_ON(va->va_end > vend);
+ ret = kasan_populate_vmalloc(addr, size);
+ if (ret) {
+ free_vmap_area(va);
+ return ERR_PTR(ret);
+ }
+
return va;
overflow:
@@ -1186,26 +1214,6 @@ int unregister_vmap_purge_notifier(struct notifier_block *nb)
EXPORT_SYMBOL_GPL(unregister_vmap_purge_notifier);
/*
- * Free a region of KVA allocated by alloc_vmap_area
- */
-static void free_vmap_area(struct vmap_area *va)
-{
- /*
- * Remove from the busy tree/list.
- */
- spin_lock(&vmap_area_lock);
- unlink_va(va, &vmap_area_root);
- spin_unlock(&vmap_area_lock);
-
- /*
- * Insert/Merge it back to the free tree/list.
- */
- spin_lock(&free_vmap_area_lock);
- merge_or_add_vmap_area(va, &free_vmap_area_root, &free_vmap_area_list);
- spin_unlock(&free_vmap_area_lock);
-}
-
-/*
* Clear the pagetable entries of a given vmap_area
*/
static void unmap_vmap_area(struct vmap_area *va)
@@ -1771,6 +1779,8 @@ void vm_unmap_ram(const void *mem, unsigned int count)
BUG_ON(addr > VMALLOC_END);
BUG_ON(!PAGE_ALIGNED(addr));
+ kasan_poison_vmalloc(mem, size);
+
if (likely(count <= VMAP_MAX_ALLOC)) {
debug_check_no_locks_freed(mem, size);
vb_free(mem, size);
@@ -1821,6 +1831,9 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t pro
addr = va->va_start;
mem = (void *)addr;
}
+
+ kasan_unpoison_vmalloc(mem, size);
+
if (vmap_page_range(addr, addr + size, prot, pages) < 0) {
vm_unmap_ram(mem, count);
return NULL;
@@ -2075,6 +2088,7 @@ static struct vm_struct *__get_vm_area_node(unsigned long size,
{
struct vmap_area *va;
struct vm_struct *area;
+ unsigned long requested_size = size;
BUG_ON(in_interrupt());
size = PAGE_ALIGN(size);
@@ -2098,23 +2112,9 @@ static struct vm_struct *__get_vm_area_node(unsigned long size,
return NULL;
}
- setup_vmalloc_vm(area, va, flags, caller);
+ kasan_unpoison_vmalloc((void *)va->va_start, requested_size);
- /*
- * For KASAN, if we are in vmalloc space, we need to cover the shadow
- * area with real memory. If we come here through VM_ALLOC, this is
- * done by a higher level function that has access to the true size,
- * which might not be a full page.
- *
- * We assume module space comes via VM_ALLOC path.
- */
- if (is_vmalloc_addr(area->addr) && !(area->flags & VM_ALLOC)) {
- if (kasan_populate_vmalloc(area->size, area)) {
- unmap_vmap_area(va);
- kfree(area);
- return NULL;
- }
- }
+ setup_vmalloc_vm(area, va, flags, caller);
return area;
}
@@ -2293,8 +2293,7 @@ static void __vunmap(const void *addr, int deallocate_pages)
debug_check_no_locks_freed(area->addr, get_vm_area_size(area));
debug_check_no_obj_freed(area->addr, get_vm_area_size(area));
- if (area->flags & VM_KASAN)
- kasan_poison_vmalloc(area->addr, area->size);
+ kasan_poison_vmalloc(area->addr, area->size);
vm_remove_mappings(area, deallocate_pages);
@@ -2539,7 +2538,7 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
if (!size || (size >> PAGE_SHIFT) > totalram_pages())
goto fail;
- area = __get_vm_area_node(size, align, VM_ALLOC | VM_UNINITIALIZED |
+ area = __get_vm_area_node(real_size, align, VM_ALLOC | VM_UNINITIALIZED |
vm_flags, start, end, node, gfp_mask, caller);
if (!area)
goto fail;
@@ -2548,11 +2547,6 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
if (!addr)
return NULL;
- if (is_vmalloc_or_module_addr(area->addr)) {
- if (kasan_populate_vmalloc(real_size, area))
- return NULL;
- }
-
/*
* In this function, newly allocated vm_struct has VM_UNINITIALIZED
* flag. It means that vm_struct is not fully initialized.
@@ -3294,7 +3288,7 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
struct vmap_area **vas, *va;
struct vm_struct **vms;
int area, area2, last_area, term_area;
- unsigned long base, start, size, end, last_end;
+ unsigned long base, start, size, end, last_end, orig_start, orig_end;
bool purged = false;
enum fit_type type;
@@ -3424,6 +3418,15 @@ retry:
spin_unlock(&free_vmap_area_lock);
+ /* populate the kasan shadow space */
+ for (area = 0; area < nr_vms; area++) {
+ if (kasan_populate_vmalloc(vas[area]->va_start, sizes[area]))
+ goto err_free_shadow;
+
+ kasan_unpoison_vmalloc((void *)vas[area]->va_start,
+ sizes[area]);
+ }
+
/* insert all vm's */
spin_lock(&vmap_area_lock);
for (area = 0; area < nr_vms; area++) {
@@ -3434,12 +3437,6 @@ retry:
}
spin_unlock(&vmap_area_lock);
- /* populate the shadow space outside of the lock */
- for (area = 0; area < nr_vms; area++) {
- /* assume success here */
- kasan_populate_vmalloc(sizes[area], vms[area]);
- }
-
kfree(vas);
return vms;
@@ -3451,8 +3448,12 @@ recovery:
* and when pcpu_get_vm_areas() is success.
*/
while (area--) {
- merge_or_add_vmap_area(vas[area], &free_vmap_area_root,
- &free_vmap_area_list);
+ orig_start = vas[area]->va_start;
+ orig_end = vas[area]->va_end;
+ va = merge_or_add_vmap_area(vas[area], &free_vmap_area_root,
+ &free_vmap_area_list);
+ kasan_release_vmalloc(orig_start, orig_end,
+ va->va_start, va->va_end);
vas[area] = NULL;
}
@@ -3487,6 +3488,28 @@ err_free2:
kfree(vas);
kfree(vms);
return NULL;
+
+err_free_shadow:
+ spin_lock(&free_vmap_area_lock);
+ /*
+ * We release all the vmalloc shadows, even the ones for regions that
+ * hadn't been successfully added. This relies on kasan_release_vmalloc
+ * being able to tolerate this case.
+ */
+ for (area = 0; area < nr_vms; area++) {
+ orig_start = vas[area]->va_start;
+ orig_end = vas[area]->va_end;
+ va = merge_or_add_vmap_area(vas[area], &free_vmap_area_root,
+ &free_vmap_area_list);
+ kasan_release_vmalloc(orig_start, orig_end,
+ va->va_start, va->va_end);
+ vas[area] = NULL;
+ kfree(vms[area]);
+ }
+ spin_unlock(&free_vmap_area_lock);
+ kfree(vas);
+ kfree(vms);
+ return NULL;
}
/**
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-04 20:14:48 +0000