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 11:35:18 +0100 Message-ID: <CAG_fn=Xt=9Wah9z=2DRdCrgfZLPV6=N57q-qTXp1-C45omy5ig@mail.gmail.com> (raw) In-Reply-To: <CAAeHK+w_MQV_1_tEit5WbSFzB9A+TWuBv598uR87Teh47NS+KA@mail.gmail.com> 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. > 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
next prev parent 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 [this message] 2019-12-10 12:38 ` Alexander Potapenko 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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