[merged] kasan-dont-assume-percpu-shadow-allocations-will-succeed.patch removed from -mm tree

[akpm@xxxxxxxxxxxxxxxxxxxx]

The patch titled
     Subject: kasan: don't assume percpu shadow allocations will succeed
has been removed from the -mm tree.  Its filename was
     kasan-dont-assume-percpu-shadow-allocations-will-succeed.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Daniel Axtens <dja@xxxxxxxxxx>
Subject: kasan: don't assume percpu shadow allocations will succeed

syzkaller and the fault injector showed that I was wrong to assume
that we could ignore percpu shadow allocation failures.

Handle failures properly. Merge all the allocated areas back into the fre=
e
list and release the shadow, then clean up and return NULL. The shadow
is released unconditionally, which relies upon the fact that the release
function is able to tolerate pages not being present.

Also clean up shadows in the recovery path - currently they are not
released, which leaks a bit of memory.

Link: http://lkml.kernel.org/r/20191205140407.1874-3-dja@xxxxxxxxxx
Fixes: 3c5c3cfb9ef4 ("kasan: support backing vmalloc space with real shad=
ow memory")
Signed-off-by: Daniel Axtens <dja@xxxxxxxxxx>
Reported-by: syzbot+82e323920b78d54aaed5@xxxxxxxxxxxxxxxxxxxxxxxxx
Reported-by: syzbot+59b7daa4315e07a994f1@xxxxxxxxxxxxxxxxxxxxxxxxx
Reviewed-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/vmalloc.c |   48 ++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 38 insertions(+), 10 deletions(-)

--- a/mm/vmalloc.c~kasan-dont-assume-percpu-shadow-allocations-will-succeed
+++ a/mm/vmalloc.c
@@ -3288,7 +3288,7 @@ struct vm_struct **pcpu_get_vm_areas(con
 	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;
 
@@ -3418,6 +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++) {
@@ -3428,13 +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(vas[area]->va_start, sizes[area]);
-		kasan_unpoison_vmalloc((void *)vms[area]->addr, sizes[area]);
-	}
-
 	kfree(vas);
 	return vms;
 
@@ -3446,8 +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;
 	}
 
@@ -3482,6 +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;
 }
 
 /**
_

Patches currently in -mm which might be from dja@xxxxxxxxxx are