OpenCloudOS-Kernel/arch/arm64/mm
Andrey Ryabinin 39d114ddc6 arm64: add KASAN support
This patch adds arch specific code for kernel address sanitizer
(see Documentation/kasan.txt).

1/8 of kernel addresses reserved for shadow memory. There was no
big enough hole for this, so virtual addresses for shadow were
stolen from vmalloc area.

At early boot stage the whole shadow region populated with just
one physical page (kasan_zero_page). Later, this page reused
as readonly zero shadow for some memory that KASan currently
don't track (vmalloc).
After mapping the physical memory, pages for shadow memory are
allocated and mapped.

Functions like memset/memmove/memcpy do a lot of memory accesses.
If bad pointer passed to one of these function it is important
to catch this. Compiler's instrumentation cannot do this since
these functions are written in assembly.
KASan replaces memory functions with manually instrumented variants.
Original functions declared as weak symbols so strong definitions
in mm/kasan/kasan.c could replace them. Original functions have aliases
with '__' prefix in name, so we could call non-instrumented variant
if needed.
Some files built without kasan instrumentation (e.g. mm/slub.c).
Original mem* function replaced (via #define) with prefixed variants
to disable memory access checks for such files.

Signed-off-by: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-10-12 17:46:36 +01:00
..
Makefile arm64: add KASAN support 2015-10-12 17:46:36 +01:00
cache.S arm64: use ENDPIPROC() to annotate position independent assembler routines 2015-10-12 16:19:45 +01:00
context.c arm64: mm: kill mm_cpumask usage 2015-10-07 11:56:29 +01:00
copypage.c arm64: export __cpu_{clear,copy}_user_page functions 2014-07-08 17:30:51 +01:00
dma-mapping.c arm64: dma-mapping: check whether cma area is initialized or not 2015-09-14 12:28:30 +01:00
dump.c arm64: Make the kernel page dump utility aware of the CONT bit 2015-10-08 18:39:57 +01:00
extable.c arm64: MMU fault handling and page table management 2012-09-17 13:41:57 +01:00
fault.c arm64/BUG: Use BRK instruction for generic BUG traps 2015-07-27 11:08:42 +01:00
flush.c arm64: force CONFIG_SMP=y and remove redundant #ifdefs 2015-07-27 11:08:40 +01:00
hugetlbpage.c arm64: hugetlb: remove paragraph about writing to FSF 2015-07-27 11:08:40 +01:00
init.c arm64: mm: add __init section marker to free_initrd_mem 2015-07-27 18:29:18 +01:00
ioremap.c arm64: add ioremap physical address information 2015-01-23 15:29:06 +00:00
kasan_init.c arm64: add KASAN support 2015-10-12 17:46:36 +01:00
mm.h arm64: add better page protections to arm64 2015-01-22 14:54:29 +00:00
mmap.c mm: expose arch_mmap_rnd when available 2015-04-14 16:49:05 -07:00
mmu.c arm64: Mark kernel page ranges contiguous 2015-10-08 18:44:14 +01:00
pageattr.c arm64: mm: unexport set_memory_ro and set_memory_rw 2015-03-19 10:43:56 +00:00
pgd.c arm64: move PGD_SIZE definition to pgalloc.h 2015-10-12 17:46:30 +01:00
proc-macros.S arm64: mm: increase VA range of identity map 2015-03-23 11:35:29 +00:00
proc.S arm64: mm: rewrite ASID allocator and MM context-switching code 2015-10-07 11:55:41 +01:00