7ca3027b72
In commit 121e6f3258fe ("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: 121e6f3258fe ("mm/vmalloc: hugepage vmalloc mappings")
Signed-off-by: Daniel Axtens <dja@axtens.net>
Tested-by: David Gow <davidgow@google.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Tested-by: Andrey Konovalov <andreyknvl@gmail.com>
Acked-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.