kasan, vmalloc: add vmalloc tagging for SW_TAGS

Add vmalloc tagging support to SW_TAGS KASAN.

- __kasan_unpoison_vmalloc() now assigns a random pointer tag, poisons
  the virtual mapping accordingly, and embeds the tag into the returned
  pointer.

- __get_vm_area_node() (used by vmalloc() and vmap()) and
  pcpu_get_vm_areas() save the tagged pointer into vm_struct->addr
  (note: not into vmap_area->addr). This requires putting
  kasan_unpoison_vmalloc() after setup_vmalloc_vm[_locked]();
  otherwise the latter will overwrite the tagged pointer.
  The tagged pointer then is naturally propagateed to vmalloc()
  and vmap().

- vm_map_ram() returns the tagged pointer directly.

As a result of this change, vm_struct->addr is now tagged.

Enabling KASAN_VMALLOC with SW_TAGS is not yet allowed.

Link: https://lkml.kernel.org/r/4a78f3c064ce905e9070c29733aca1dd254a74f1.1643047180.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

include/linux/kasan.h

@@ -424,12 +424,13 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end,
 			   unsigned long free_region_start,
 			   unsigned long free_region_end);
 
-void __kasan_unpoison_vmalloc(const void *start, unsigned long size);
-static __always_inline void kasan_unpoison_vmalloc(const void *start,
-						   unsigned long size)
+void *__kasan_unpoison_vmalloc(const void *start, unsigned long size);
+static __always_inline void *kasan_unpoison_vmalloc(const void *start,
+						    unsigned long size)
 {
 	if (kasan_enabled())
-		__kasan_unpoison_vmalloc(start, size);
+		return __kasan_unpoison_vmalloc(start, size);
+	return (void *)start;
 }
 
 void __kasan_poison_vmalloc(const void *start, unsigned long size);
@@ -454,8 +455,11 @@ static inline void kasan_release_vmalloc(unsigned long start,
 					 unsigned long free_region_start,
 					 unsigned long free_region_end) { }
 
-static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size)
-{ }
+static inline void *kasan_unpoison_vmalloc(const void *start,
+					   unsigned long size)
+{
+	return (void *)start;
+}
 static inline void kasan_poison_vmalloc(const void *start, unsigned long size)
 { }
 

mm/kasan/shadow.c

@@ -475,12 +475,14 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end,
 	}
 }
 
-void __kasan_unpoison_vmalloc(const void *start, unsigned long size)
+void *__kasan_unpoison_vmalloc(const void *start, unsigned long size)
 {
 	if (!is_vmalloc_or_module_addr(start))
-		return;
+		return (void *)start;
 
+	start = set_tag(start, kasan_random_tag());
 	kasan_unpoison(start, size, false);
+	return (void *)start;
 }
 
 /*

mm/vmalloc.c

@@ -2210,7 +2210,7 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node)
 		mem = (void *)addr;
 	}
 
-	kasan_unpoison_vmalloc(mem, size);
+	mem = kasan_unpoison_vmalloc(mem, size);
 
 	if (vmap_pages_range(addr, addr + size, PAGE_KERNEL,
 				pages, PAGE_SHIFT) < 0) {
@@ -2443,10 +2443,10 @@ static struct vm_struct *__get_vm_area_node(unsigned long size,
 		return NULL;
 	}
 
-	kasan_unpoison_vmalloc((void *)va->va_start, requested_size);
-
 	setup_vmalloc_vm(area, va, flags, caller);
 
+	area->addr = kasan_unpoison_vmalloc(area->addr, requested_size);
+
 	return area;
 }
 
@@ -3795,9 +3795,6 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
 	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 */
@@ -3810,6 +3807,11 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
 	}
 	spin_unlock(&vmap_area_lock);
 
+	/* mark allocated areas as accessible */
+	for (area = 0; area < nr_vms; area++)
+		vms[area]->addr = kasan_unpoison_vmalloc(vms[area]->addr,
+							 vms[area]->size);
+
 	kfree(vas);
 	return vms;