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x86: kasan: kmsan: support CONFIG_GENERIC_CSUM on x86, enable it for KASAN/KMSAN 

This is needed to allow memory tools like KASAN and KMSAN see the memory
accesses from the checksum code.  Without CONFIG_GENERIC_CSUM the tools
can't see memory accesses originating from handwritten assembly code.

For KASAN it's a question of detecting more bugs, for KMSAN using the C
implementation also helps avoid false positives originating from seemingly
uninitialized checksum values.

Link: https://lkml.kernel.org/r/20220915150417.722975-38-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Eric Biggers <ebiggers@kernel.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alexander Potapenko 2022-09-15 17:04:11 +02:00 committed by Andrew Morton
parent 3f1e2c7a90
commit d911c67e10
3 changed files with 16 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/Kconfig
View File

@ -325,6 +325,10 @@ config GENERIC_ISA_DMA
def_bool y
depends on ISA_DMA_API
config GENERIC_CSUM
bool
default y if KMSAN || KASAN
config GENERIC_BUG
def_bool y
depends on BUG

16
arch/x86/include/asm/checksum.h
View File

@ -1,9 +1,13 @@
/* SPDX-License-Identifier: GPL-2.0 */
#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER 1
#define HAVE_CSUM_COPY_USER
#define _HAVE_ARCH_CSUM_AND_COPY
#ifdef CONFIG_X86_32
# include <asm/checksum_32.h>
#ifdef CONFIG_GENERIC_CSUM
# include <asm-generic/checksum.h>
#else
# include <asm/checksum_64.h>
# define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER 1
# define HAVE_CSUM_COPY_USER
# define _HAVE_ARCH_CSUM_AND_COPY
# ifdef CONFIG_X86_32
# include <asm/checksum_32.h>
# else
# include <asm/checksum_64.h>
# endif
#endif

2
arch/x86/lib/Makefile
View File

@ -65,7 +65,9 @@ ifneq ($(CONFIG_X86_CMPXCHG64),y)
endif
else
obj-y += iomap_copy_64.o
ifneq ($(CONFIG_GENERIC_CSUM),y)
lib-y += csum-partial_64.o csum-copy_64.o csum-wrappers_64.o
endif
lib-y += clear_page_64.o copy_page_64.o
lib-y += memmove_64.o memset_64.o
lib-y += copy_user_64.o