mm/vmalloc: unbreak kasan vmalloc support
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>
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