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From: Alexander Potapenko <glider@google.com>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	 Vegard Nossum <vegard.nossum@oracle.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	 Linux Memory Management List <linux-mm@kvack.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	 Andreas Dilger <adilger.kernel@dilger.ca>,
	Andrew Morton <akpm@linux-foundation.org>,
	 Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	 Christoph Hellwig <hch@infradead.org>,
	Christoph Hellwig <hch@lst.de>,
	 "Darrick J. Wong" <darrick.wong@oracle.com>,
	"David S. Miller" <davem@davemloft.net>,
	 Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Eric Biggers <ebiggers@google.com>,
	 Eric Dumazet <edumazet@google.com>,
	Eric Van Hensbergen <ericvh@gmail.com>,
	 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Harry Wentland <harry.wentland@amd.com>,
	 Herbert Xu <herbert@gondor.apana.org.au>,
	Ilya Leoshkevich <iii@linux.ibm.com>,
	 Ingo Molnar <mingo@elte.hu>, Jason Wang <jasowang@redhat.com>,
	Jens Axboe <axboe@kernel.dk>,
	 Marek Szyprowski <m.szyprowski@samsung.com>,
	Marco Elver <elver@google.com>,
	 Mark Rutland <mark.rutland@arm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	 Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Matthew Wilcox <willy@infradead.org>,
	 "Michael S . Tsirkin" <mst@redhat.com>,
	Michal Simek <monstr@monstr.eu>, Petr Mladek <pmladek@suse.com>,
	 Qian Cai <cai@lca.pw>, Randy Dunlap <rdunlap@infradead.org>,
	Robin Murphy <robin.murphy@arm.com>,
	 Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	 Takashi Iwai <tiwai@suse.com>, "Theodore Ts'o" <tytso@mit.edu>,
	Vasily Gorbik <gor@linux.ibm.com>,
	 Wolfram Sang <wsa@the-dreams.de>
Subject: Re: [PATCH RFC v3 21/36] kmsan: disable KMSAN instrumentation for certain kernel parts
Date: Tue, 10 Dec 2019 13:38:24 +0100
Message-ID: <CAG_fn=W+qHsGQg2E7dmZ3oAPR2OfzOv3bHfvDArJTJd2+D78rA@mail.gmail.com> (raw)
In-Reply-To: <CAG_fn=Xt=9Wah9z=2DRdCrgfZLPV6=N57q-qTXp1-C45omy5ig@mail.gmail.com>

On Tue, Dec 10, 2019 at 11:35 AM Alexander Potapenko <glider@google.com> wrote:
>
> On Fri, Nov 29, 2019 at 4:07 PM Andrey Konovalov <andreyknvl@google.com> wrote:
> >
> > On Fri, Nov 22, 2019 at 12:27 PM <glider@google.com> wrote:
> > >
> > > Instrumenting some files with KMSAN will result in kernel being unable
> > > to link, boot or crashing at runtime for various reasons (e.g. infinite
> > > recursion caused by instrumentation hooks calling instrumented code again).
> > >
> > > Disable KMSAN in the following places:
> > >  - arch/x86/boot and arch/x86/realmode/rm, as KMSAN doesn't work for i386;
> > >  - arch/x86/entry/vdso, which isn't linked with KMSAN runtime;
> > >  - three files in arch/x86/kernel - boot problems;
> > >  - arch/x86/mm/cpu_entry_area.c - recursion;
> > >  - EFI stub - build failures;
> > >  - kcov, stackdepot - recursion.
> >
> > It makes sense to unify comments explaining the reasons for
> > KMSAN_SANITIZE := n with KCSAN patches:
> In principle, yes.
> But KCSAN hasn't reached upstream yet, and rebasing on top of it will
> increase the number of moving parts to take into account.
Ah, I see. Yes, I'll add meaningful comments in v4.
>
> > https://patchwork.kernel.org/patch/11244145/
> > https://patchwork.kernel.org/patch/11244161/
> >
> > >
> > > Signed-off-by: Alexander Potapenko <glider@google.com>
> > > To: Alexander Potapenko <glider@google.com>
> > > Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> > > Cc: Thomas Gleixner <tglx@linutronix.de>
> > > Cc: Vegard Nossum <vegard.nossum@oracle.com>
> > > Cc: Dmitry Vyukov <dvyukov@google.com>
> > > Cc: linux-mm@kvack.org
> > > ---
> > >
> > > Change-Id: I90961eabf2dcb9ae992aed259088953bad5e4d6d
> > > ---
> > >  arch/x86/boot/Makefile                | 2 ++
> > >  arch/x86/boot/compressed/Makefile     | 2 ++
> > >  arch/x86/entry/vdso/Makefile          | 3 +++
> > >  arch/x86/kernel/Makefile              | 4 ++++
> > >  arch/x86/kernel/cpu/Makefile          | 1 +
> > >  arch/x86/mm/Makefile                  | 2 ++
> > >  arch/x86/realmode/rm/Makefile         | 2 ++
> > >  drivers/firmware/efi/libstub/Makefile | 1 +
> > >  kernel/Makefile                       | 1 +
> > >  lib/Makefile                          | 1 +
> > >  10 files changed, 19 insertions(+)
> > >
> > > diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
> > > index e2839b5c246c..c039abd4c81f 100644
> > > --- a/arch/x86/boot/Makefile
> > > +++ b/arch/x86/boot/Makefile
> > > @@ -10,6 +10,8 @@
> > >  #
> > >
> > >  KASAN_SANITIZE                 := n
> > > +# KMSAN doesn't work for i386
> > > +KMSAN_SANITIZE                 := n
> > >  OBJECT_FILES_NON_STANDARD      := y
> > >
> > >  # Kernel does not boot with kcov instrumentation here.
> > > diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
> > > index 6b84afdd7538..9efe2d9fca4c 100644
> > > --- a/arch/x86/boot/compressed/Makefile
> > > +++ b/arch/x86/boot/compressed/Makefile
> > > @@ -18,6 +18,8 @@
> > >  #      compressed vmlinux.bin.all + u32 size of vmlinux.bin.all
> > >
> > >  KASAN_SANITIZE                 := n
> > > +# KMSAN doesn't work for i386
> > > +KMSAN_SANITIZE                 := n
> > >  OBJECT_FILES_NON_STANDARD      := y
> > >
> > >  # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
> > > diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile
> > > index 0f2154106d01..000467a1a4f2 100644
> > > --- a/arch/x86/entry/vdso/Makefile
> > > +++ b/arch/x86/entry/vdso/Makefile
> > > @@ -11,6 +11,9 @@ include $(srctree)/lib/vdso/Makefile
> > >
> > >  KBUILD_CFLAGS += $(DISABLE_LTO)
> > >  KASAN_SANITIZE                 := n
> > > +# Undefined references to KMSAN hooks.
> > > +KMSAN_SANITIZE_vclock_gettime.o := n
> > > +KMSAN_SANITIZE_vgetcpu.o       := n
> > >  UBSAN_SANITIZE                 := n
> > >  OBJECT_FILES_NON_STANDARD      := y
> > >
> > > diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
> > > index 3578ad248bc9..ce39972a7edf 100644
> > > --- a/arch/x86/kernel/Makefile
> > > +++ b/arch/x86/kernel/Makefile
> > > @@ -28,6 +28,10 @@ KASAN_SANITIZE_dumpstack_$(BITS).o                   := n
> > >  KASAN_SANITIZE_stacktrace.o                            := n
> > >  KASAN_SANITIZE_paravirt.o                              := n
> > >
> > > +# Work around reboot loop.
> > > +KMSAN_SANITIZE_head$(BITS).o                           := n
> > > +KMSAN_SANITIZE_nmi.o                                   := n
> > > +
> > >  OBJECT_FILES_NON_STANDARD_relocate_kernel_$(BITS).o    := y
> > >  OBJECT_FILES_NON_STANDARD_test_nx.o                    := y
> > >  OBJECT_FILES_NON_STANDARD_paravirt_patch.o             := y
> > > diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
> > > index d7a1e5a9331c..41f4f8f2f2f0 100644
> > > --- a/arch/x86/kernel/cpu/Makefile
> > > +++ b/arch/x86/kernel/cpu/Makefile
> > > @@ -12,6 +12,7 @@ endif
> > >  # If these files are instrumented, boot hangs during the first second.
> > >  KCOV_INSTRUMENT_common.o := n
> > >  KCOV_INSTRUMENT_perf_event.o := n
> > > +KMSAN_SANITIZE_common.o := n
> > >
> > >  # Make sure load_percpu_segment has no stackprotector
> > >  nostackp := $(call cc-option, -fno-stack-protector)
> > > diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile
> > > index 84373dc9b341..42cb3a6409b0 100644
> > > --- a/arch/x86/mm/Makefile
> > > +++ b/arch/x86/mm/Makefile
> > > @@ -7,6 +7,8 @@ KCOV_INSTRUMENT_mem_encrypt_identity.o  := n
> > >  KASAN_SANITIZE_mem_encrypt.o           := n
> > >  KASAN_SANITIZE_mem_encrypt_identity.o  := n
> > >
> > > +KMSAN_SANITIZE_cpu_entry_area.o := n
> > > +
> > >  ifdef CONFIG_FUNCTION_TRACER
> > >  CFLAGS_REMOVE_mem_encrypt.o            = -pg
> > >  CFLAGS_REMOVE_mem_encrypt_identity.o   = -pg
> > > diff --git a/arch/x86/realmode/rm/Makefile b/arch/x86/realmode/rm/Makefile
> > > index f60501a384f9..27e7bc0bbdde 100644
> > > --- a/arch/x86/realmode/rm/Makefile
> > > +++ b/arch/x86/realmode/rm/Makefile
> > > @@ -7,6 +7,8 @@
> > >  #
> > >  #
> > >  KASAN_SANITIZE                 := n
> > > +# KMSAN doesn't work for i386
> > > +KMSAN_SANITIZE                 := n
> > >  OBJECT_FILES_NON_STANDARD      := y
> > >
> > >  # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
> > > diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
> > > index 0460c7581220..11869c17a64c 100644
> > > --- a/drivers/firmware/efi/libstub/Makefile
> > > +++ b/drivers/firmware/efi/libstub/Makefile
> > > @@ -32,6 +32,7 @@ KBUILD_CFLAGS                 := $(cflags-y) -DDISABLE_BRANCH_PROFILING \
> > >
> > >  GCOV_PROFILE                   := n
> > >  KASAN_SANITIZE                 := n
> > > +KMSAN_SANITIZE                 := n
> > >  UBSAN_SANITIZE                 := n
> > >  OBJECT_FILES_NON_STANDARD      := y
> > >
> > > diff --git a/kernel/Makefile b/kernel/Makefile
> > > index daad787fb795..5fd6fbca2592 100644
> > > --- a/kernel/Makefile
> > > +++ b/kernel/Makefile
> > > @@ -30,6 +30,7 @@ KCOV_INSTRUMENT_extable.o := n
> > >  # Don't self-instrument.
> > >  KCOV_INSTRUMENT_kcov.o := n
> > >  KASAN_SANITIZE_kcov.o := n
> > > +KMSAN_SANITIZE_kcov.o := n
> > >  CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector)
> > >
> > >  # cond_syscall is currently not LTO compatible
> > > diff --git a/lib/Makefile b/lib/Makefile
> > > index 08fcb37499a0..ae6e57d857b0 100644
> > > --- a/lib/Makefile
> > > +++ b/lib/Makefile
> > > @@ -222,6 +222,7 @@ obj-$(CONFIG_IRQ_POLL) += irq_poll.o
> > >  CFLAGS_stackdepot.o += -fno-builtin
> > >  obj-$(CONFIG_STACKDEPOT) += stackdepot.o
> > >  KASAN_SANITIZE_stackdepot.o := n
> > > +KMSAN_SANITIZE_stackdepot.o := n
> > >  KCOV_INSTRUMENT_stackdepot.o := n
> > >
> > >  libfdt_files = fdt.o fdt_ro.o fdt_wip.o fdt_rw.o fdt_sw.o fdt_strerror.o \
> > > --
> > > 2.24.0.432.g9d3f5f5b63-goog
> > >
>
>
>
> --
> Alexander Potapenko
> Software Engineer
>
> Google Germany GmbH
> Erika-Mann-Straße, 33
> 80636 München
>
> Geschäftsführer: Paul Manicle, Halimah DeLaine Prado
> Registergericht und -nummer: Hamburg, HRB 86891
> Sitz der Gesellschaft: Hamburg



-- 
Alexander Potapenko
Software Engineer

Google Germany GmbH
Erika-Mann-Straße, 33
80636 München

Geschäftsführer: Paul Manicle, Halimah DeLaine Prado
Registergericht und -nummer: Hamburg, HRB 86891
Sitz der Gesellschaft: Hamburg


  reply index

Thread overview: 120+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-22 11:25 [PATCH RFC v3 00/36] Add KernelMemorySanitizer infrastructure glider
2019-11-22 11:25 ` [PATCH RFC v3 01/36] stackdepot: check depot_index before accessing the stack slab glider
2019-11-27 14:22   ` Marco Elver
2019-11-22 11:25 ` [PATCH RFC v3 02/36] stackdepot: build with -fno-builtin glider
2019-11-27 14:22   ` Marco Elver
2019-11-22 11:25 ` [PATCH RFC v3 03/36] kasan: stackdepot: move filter_irq_stacks() to stackdepot.c glider
2019-11-27 14:22   ` Marco Elver
2019-11-27 14:56     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 04/36] stackdepot: reserve 5 extra bits in depot_stack_handle_t glider
2019-11-27 14:23   ` Marco Elver
2019-11-22 11:25 ` [PATCH RFC v3 05/36] kmsan: add ReST documentation glider
2019-11-27 14:22   ` Marco Elver
2019-12-03 12:42     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 06/36] kmsan: gfp: introduce __GFP_NO_KMSAN_SHADOW glider
2019-11-27 14:48   ` Marco Elver
2019-12-03 12:57     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 07/36] kmsan: introduce __no_sanitize_memory and __SANITIZE_MEMORY__ glider
2019-11-28 13:13   ` Marco Elver
2019-11-29 16:09   ` Andrey Konovalov
2019-12-16 11:35     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 08/36] kmsan: reduce vmalloc space glider
2019-11-28 13:30   ` Marco Elver
2019-11-22 11:25 ` [PATCH RFC v3 09/36] kmsan: add KMSAN bits to struct page and struct task_struct glider
2019-11-28 13:44   ` Marco Elver
2019-11-28 14:05     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 10/36] kmsan: add KMSAN runtime glider
2019-11-24 19:44   ` Wolfram Sang
2019-11-25  9:14     ` Alexander Potapenko
2019-11-29 16:07   ` Marco Elver
2019-12-19 14:16     ` Alexander Potapenko
2019-12-02 15:39   ` Andrey Konovalov
2019-12-20 18:58     ` Alexander Potapenko
2019-12-03 14:34   ` Andrey Konovalov
2019-11-22 11:25 ` [PATCH RFC v3 11/36] kmsan: stackdepot: don't allocate KMSAN metadata for stackdepot glider
2019-11-29 14:52   ` Andrey Konovalov
2019-12-03 14:27     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 12/36] kmsan: define READ_ONCE_NOCHECK() glider
2019-12-02 10:03   ` Marco Elver
2019-12-03 12:45     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 13/36] kmsan: make READ_ONCE_TASK_STACK() return initialized values glider
2019-12-02 10:07   ` Marco Elver
2019-12-05 15:52     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 14/36] kmsan: x86: sync metadata pages on page fault glider
2019-11-22 11:26 ` [PATCH RFC v3 15/36] kmsan: add tests for KMSAN glider
2019-11-29 14:14   ` Andrey Konovalov
2019-12-05 14:30     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 16/36] crypto: kmsan: disable accelerated configs under KMSAN glider
2019-12-02 13:25   ` Marco Elver
2019-12-05 14:51     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 17/36] kmsan: x86: disable UNWINDER_ORC " glider
2019-12-02 13:30   ` Marco Elver
2019-11-22 11:26 ` [PATCH RFC v3 18/36] kmsan: disable LOCK_DEBUGGING_SUPPORT glider
2019-12-02 13:33   ` Marco Elver
2019-12-03 14:34     ` Alexander Potapenko
2019-12-03 15:00       ` Qian Cai
2019-12-03 15:14         ` Alexander Potapenko
2019-12-03 18:02           ` Qian Cai
2019-12-03 18:38           ` Steven Rostedt
2019-12-04  8:41             ` Alexander Potapenko
2019-12-04 12:22               ` Petr Mladek
2019-12-04 13:12                 ` Qian Cai
2019-12-04 16:24                   ` Alexander Potapenko
2019-12-04 18:03                     ` Qian Cai
2019-11-22 11:26 ` [PATCH RFC v3 20/36] kmsan: x86: increase stack sizes in KMSAN builds glider
2019-12-02 14:31   ` Marco Elver
2019-11-22 11:26 ` [PATCH RFC v3 21/36] kmsan: disable KMSAN instrumentation for certain kernel parts glider
2019-11-29 15:07   ` Andrey Konovalov
2019-12-10 10:35     ` Alexander Potapenko
2019-12-10 12:38       ` Alexander Potapenko [this message]
2019-12-10 12:43       ` Qian Cai
2019-11-22 11:26 ` [PATCH RFC v3 22/36] kmsan: mm: call KMSAN hooks from SLUB code glider
2019-12-02 15:36   ` Marco Elver
2019-12-10 12:07     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 23/36] kmsan: call KMSAN hooks where needed glider
2019-11-26 10:17   ` Petr Mladek
2019-11-26 10:52     ` Alexander Potapenko
2019-11-29 16:21   ` Andrey Konovalov
2019-12-16 11:30     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 24/36] kmsan: disable instrumentation of certain functions glider
2019-11-29 14:59   ` Andrey Konovalov
2019-12-18 10:02     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 25/36] kmsan: unpoison |tlb| in arch_tlb_gather_mmu() glider
2019-11-29 15:08   ` Andrey Konovalov
2019-12-03 14:19     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 26/36] kmsan: use __msan_memcpy() where possible glider
2019-11-29 15:13   ` Andrey Konovalov
2019-12-05 15:46     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 27/36] kmsan: hooks for copy_to_user() and friends glider
2019-11-29 15:34   ` Andrey Konovalov
2019-12-05 16:00     ` Alexander Potapenko
2019-12-05 16:44       ` Andrey Konovalov
2019-12-11 14:22         ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 28/36] kmsan: enable KMSAN builds glider
2019-11-29 15:55   ` Andrey Konovalov
2019-12-11 12:51     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 29/36] kmsan: handle /dev/[u]random glider
2019-11-22 11:26 ` [PATCH RFC v3 30/36] kmsan: virtio: check/unpoison scatterlist in vring_map_one_sg() glider
2019-11-22 11:26 ` [PATCH RFC v3 31/36] kmsan: disable strscpy() optimization under KMSAN glider
2019-12-02 15:51   ` Marco Elver
2019-12-02 16:23     ` Alexander Potapenko
2019-12-03 11:19       ` Alexander Potapenko
2019-12-03 11:24         ` Marco Elver
2019-12-03 11:27           ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 32/36] kmsan: add iomap support glider
2019-12-03 12:50   ` Marco Elver
2019-12-03 14:07     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 33/36] kmsan: dma: unpoison memory mapped by dma_direct_map_page() glider
2019-11-22 11:26 ` [PATCH RFC v3 34/36] kmsan: disable physical page merging in biovec glider
2019-12-03 12:54   ` Marco Elver
2019-12-03 13:38     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 35/36] kmsan: ext4: skip block merging logic in ext4_mpage_readpages for KMSAN glider
2019-11-25 16:05   ` Robin Murphy
2019-11-25 17:03     ` Alexander Potapenko
2019-12-03 14:22   ` Marco Elver
2019-12-05 14:31     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 36/36] net: kasan: kmsan: support CONFIG_GENERIC_CSUM on x86, enable it for KASAN/KMSAN glider
2019-12-03 14:17   ` Marco Elver
2019-12-05 14:37     ` Alexander Potapenko
2019-11-29 14:39 ` [PATCH RFC v3 00/36] Add KernelMemorySanitizer infrastructure Marco Elver
2019-12-02 16:02   ` Alexander Potapenko

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Linux-mm Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-mm/0 linux-mm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-mm linux-mm/ https://lore.kernel.org/linux-mm \
		linux-mm@kvack.org
	public-inbox-index linux-mm

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kvack.linux-mm


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git