mainline inclusion
from mainline-5.13
commit 7ca3027b
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I3ZGKZ
CVE: NA

-------------------------------------------------

In commit 121e6f32 ("mm/vmalloc: hugepage vmalloc mappings"),
__vmalloc_node_range was changed such that __get_vm_area_node was no
longer called with the requested/real size of the vmalloc allocation,
but rather with a rounded-up size.

This means that __get_vm_area_node called kasan_unpoision_vmalloc() with
a rounded up size rather than the real size.  This led to it allowing
access to too much memory and so missing vmalloc OOBs and failing the
kasan kunit tests.

Pass the real size and the desired shift into __get_vm_area_node.  This
allows it to round up the size for the underlying allocators while still
unpoisioning the correct quantity of shadow memory.

Adjust the other call-sites to pass in PAGE_SHIFT for the shift value.

Link: https://lkml.kernel.org/r/20210617081330.98629-1-dja@axtens.net
Link: https://bugzilla.kernel.org/show_bug.cgi?id=213335
Fixes: 121e6f32 ("mm/vmalloc: hugepage vmalloc mappings")
Signed-off-by: NDaniel Axtens <dja@axtens.net>
Tested-by: NDavid Gow <davidgow@google.com>
Reviewed-by: NNicholas Piggin <npiggin@gmail.com>
Reviewed-by: NUladzislau Rezki (Sony) <urezki@gmail.com>
Tested-by: NAndrey Konovalov <andreyknvl@gmail.com>
Acked-by: NAndrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NChen Wandun <chenwandun@huawei.com>
Reviewed-by: NTong Tiangen <tongtiangen@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>