[ Upstream commit 19a2ca0fb560fd7be7b5293c6b652c6d6078dcde ]

ARM64 has asm implementation of memchr(), memcmp(), str[r]chr(),
str[n]cmp(), str[n]len().  KASAN don't see memory accesses in asm code,
thus it can potentially miss many bugs.

Ifdef out __HAVE_ARCH_* defines of these functions when KASAN is enabled,
so the generic implementations from lib/string.c will be used.

We can't just remove the asm functions because efistub uses them.  And we
can't have two non-weak functions either, so declare the asm functions as
weak.

Link: http://lkml.kernel.org/r/20180920135631.23833-2-aryabinin@virtuozzo.comSigned-off-by: NAndrey Ryabinin <aryabinin@virtuozzo.com>
Reported-by: NKyeongdon Kim <kyeongdon.kim@lge.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>

Otherwise modules that use these arithmetic operations will fail to
link. We accomplish this with the usual EXPORT_SYMBOL, which on most
architectures goes in the .S file but the ARM64 maintainers prefer that
insead it goes into arm64ksyms.

While we're at it, we also fix this up to use SPDX, and I personally
choose to relicense this as GPL2||BSD so that these symbols don't need
to be export_symbol_gpl, so all modules can use the routines, since
these are important general purpose compiler-generated function calls.
Signed-off-by: NJason A. Donenfeld <Jason@zx2c4.com>
Reported-by: NPaX Team <pageexec@freemail.hu>
Cc: stable@vger.kernel.org
Signed-off-by: NWill Deacon <will.deacon@arm.com>

Like we've done for get_user and put_user, ensure that user pointers
are masked before invoking the underlying __arch_{clear,copy_*}_user
operations.
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

This patch adds a quirk parameter to the arm_smccc_(smc/hvc) calls.
The quirk structure allows for specialized SMC operations due to SoC
specific requirements.  The current arm_smccc_(smc/hvc) is renamed and
macros are used instead to specify the standard arm_smccc_(smc/hvc) or
the arm_smccc_(smc/hvc)_quirk function.

This patch and partial implementation was suggested by Will Deacon.
Signed-off-by: NAndy Gross <andy.gross@linaro.org>
Reviewed-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>

Enables CONFIG_HARDENED_USERCOPY checks on arm64. As done by KASAN in -next,
renames the low-level functions to __arch_copy_*_user() so a static inline
can do additional work before the copy.
Signed-off-by: NKees Cook <keescook@chromium.org>

Add all function symbols which are called from do_debug_exception under
NOKPROBE_SYMBOL, as they can not kprobed.
Signed-off-by: NPratyush Anand <panand@redhat.com>
Acked-by: NMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

The upstream commit 1771c6e1
("x86/kasan: instrument user memory access API") added KASAN instrument to
x86 user memory access API, so added such instrument to ARM64 too.

Define __copy_to/from_user in C in order to add kasan_check_read/write call,
rename assembly implementation to __arch_copy_to/from_user.

Tested by test_kasan module.
Acked-by: NAndrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: NMark Rutland <mark.rutland@arm.com>
Tested-by: NMark Rutland <mark.rutland@arm.com>
Signed-off-by: NYang Shi <yang.shi@linaro.org>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

Adds implementation for arm-smccc and enables CONFIG_HAVE_SMCCC.
Acked-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NJens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

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: NAndrey Ryabinin <ryabinin.a.a@gmail.com>
Tested-by: NLinus Walleij <linus.walleij@linaro.org>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

This patch implements arm64 specific part to support function tracers,
such as function (CONFIG_FUNCTION_TRACER), function_graph
(CONFIG_FUNCTION_GRAPH_TRACER) and function profiler
(CONFIG_FUNCTION_PROFILER).

With 'function' tracer, all the functions in the kernel are traced with
timestamps in ${sysfs}/tracing/trace. If function_graph tracer is
specified, call graph is generated.

The kernel must be compiled with -pg option so that _mcount() is inserted
at the beginning of functions. This function is called on every function's
entry as long as tracing is enabled.
In addition, function_graph tracer also needs to be able to probe function's
exit. ftrace_graph_caller() & return_to_handler do this by faking link
register's value to intercept function's return path.

More details on architecture specific requirements are described in
Documentation/trace/ftrace-design.txt.
Reviewed-by: NGanapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
Acked-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NAKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: NWill Deacon <will.deacon@arm.com>

This patch, based on Linaro's Cortex Strings library, adds
an assembly optimized strlen() and strnlen() functions.
Signed-off-by: NZhichang Yuan <zhichang.yuan@linaro.org>
Signed-off-by: NDeepak Saxena <dsaxena@linaro.org>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

This patch, based on Linaro's Cortex Strings library, adds
an assembly optimized strcmp() and strncmp() functions.
Signed-off-by: NZhichang Yuan <zhichang.yuan@linaro.org>
Signed-off-by: NDeepak Saxena <dsaxena@linaro.org>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

This patch, based on Linaro's Cortex Strings library, adds
an assembly optimized memcmp() function.
Signed-off-by: NZhichang Yuan <zhichang.yuan@linaro.org>
Signed-off-by: NDeepak Saxena <dsaxena@linaro.org>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

This patch implements the word-at-a-time interface for arm64 using the
same algorithm as ARM. We use the fls64 macro, which expands to a clz
instruction via a compiler builtin. Big-endian configurations make use
of the implementation from asm-generic.

With this implemented, we can replace our byte-at-a-time strnlen_user
and strncpy_from_user functions with the optimised generic versions.
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

This function may be called from loadable modules, so it needs
exporting.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Reported-by: NLoc Ho <lho@apm.com>

Need 'EXPORT_SYMBOL(clear_page)' if building with allmodconfig.

The related errors:
  ERROR: "clear_page" [fs/ocfs2/dlm/ocfs2_dlm.ko] undefined!
  ERROR: "clear_page" [fs/ntfs/ntfs.ko] undefined!
  ERROR: "clear_page" [fs/gfs2/gfs2.ko] undefined!
  ERROR: "clear_page" [fs/fuse/fuse.ko] undefined!
  ERROR: "clear_page" [fs/ext3/ext3.ko] undefined!
  ERROR: "clear_page" [fs/ext2/ext2.ko] undefined!
  ERROR: "clear_page" [fs/exofs/libore.ko] undefined!
  ERROR: "clear_page" [fs/exofs/exofs.ko] undefined!
  ERROR: "clear_page" [drivers/block/brd.ko] undefined!
Signed-off-by: NChen Gang <gang.chen@asianux.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

This patch implements the AArch64-specific atomic bitops functions using
exclusive memory accesses to avoid locking.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

This patch introduces AArch64-specific string functions (strchr,
strrchr).
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

This patch introduces AArch64-specific memory functions (memcpy,
memmove, memchr, memset). These functions are not optimised for any CPU
implementation but can be used as a starting point once hardware is
available.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

The __atomic_hash is only defined when SMP is enabled but the
arm64ksyms.c exports it even for the UP case.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

This patch adds udelay, memory and bit operations together with the
ksyms exports.
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Acked-by: NTony Lindgren <tony@atomide.com>
Acked-by: NNicolas Pitre <nico@linaro.org>
Acked-by: NOlof Johansson <olof@lixom.net>
Acked-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>