linux/arch/arm64/lib
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
..
atomic_ll_sc.c arm64: introduce CONFIG_ARM64_LSE_ATOMICS as fallback to ll/sc atomics 2015-07-27 15:28:50 +01:00
bitops.S arm64: atomics: prefetch the destination word for write prior to stxr 2015-07-27 15:28:53 +01:00
clear_page.S
clear_user.S
copy_from_user.S arm64: copy_to-from-in_user optimization using copy template 2015-10-07 11:34:44 +01:00
copy_in_user.S arm64: copy_to-from-in_user optimization using copy template 2015-10-07 11:34:44 +01:00
copy_page.S
copy_template.S arm64: Change memcpy in kernel to use the copy template file 2015-10-07 11:34:43 +01:00
copy_to_user.S arm64: copy_to-from-in_user optimization using copy template 2015-10-07 11:34:44 +01:00
delay.c
Makefile arm64: introduce CONFIG_ARM64_LSE_ATOMICS as fallback to ll/sc atomics 2015-07-27 15:28:50 +01:00
memchr.S arm64: use ENDPIPROC() to annotate position independent assembler routines 2015-10-12 16:19:45 +01:00
memcmp.S arm64: use ENDPIPROC() to annotate position independent assembler routines 2015-10-12 16:19:45 +01:00
memcpy.S arm64: add KASAN support 2015-10-12 17:46:36 +01:00
memmove.S arm64: add KASAN support 2015-10-12 17:46:36 +01:00
memset.S arm64: add KASAN support 2015-10-12 17:46:36 +01:00
strchr.S
strcmp.S arm64: use ENDPIPROC() to annotate position independent assembler routines 2015-10-12 16:19:45 +01:00
strlen.S arm64: use ENDPIPROC() to annotate position independent assembler routines 2015-10-12 16:19:45 +01:00
strncmp.S arm64: use ENDPIPROC() to annotate position independent assembler routines 2015-10-12 16:19:45 +01:00
strnlen.S
strrchr.S