From: Andrey Konovalov <andreyknvl@google.com> To: Alexander Potapenko <glider@google.com> Cc: Thomas Gleixner <tglx@linutronix.de>, Andrew Morton <akpm@linux-foundation.org>, 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>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Andy Lutomirski <luto@kernel.org>, Ard Biesheuvel <ard.biesheuvel@linaro.org>, Arnd Bergmann <arnd@arndb.de>, Christoph Hellwig <hch@infradead.org>, Christoph Hellwig <hch@lst.de>, 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>, ericvh@gmail.com, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, harry.wentland@amd.com, Herbert Xu <herbert@gondor.apana.org.au>, iii@linux.ibm.com, 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>, pmladek@suse.com, Qian Cai <cai@lca.pw>, Randy Dunlap <rdunlap@infradead.org>, Robin Murphy <robin.murphy@arm.com>, sergey.senozhatsky@gmail.com, Steven Rostedt <rostedt@goodmis.org>, Takashi Iwai <tiwai@suse.com>, "Theodore Ts'o" <tytso@mit.edu>, gor@linux.ibm.com, wsa@the-dreams.de Subject: Re: [PATCH RFC v3 24/36] kmsan: disable instrumentation of certain functions Date: Fri, 29 Nov 2019 15:59:05 +0100 Message-ID: <CAAeHK+xU2WGtaitQtO7kSQ7gsXGz72y9dn08WBMtugMPnPkHnw@mail.gmail.com> (raw) In-Reply-To: <20191122112621.204798-25-glider@google.com> On Fri, Nov 22, 2019 at 12:27 PM <glider@google.com> wrote: > > Some functions are called from handwritten assembly, and therefore don't > have their arguments' metadata fully set up by the instrumentation code. > Mark them with __no_sanitize_memory to avoid false positives from > spreading further. > Certain functions perform task switching, so that the value of |current| > is different as they proceed. Because KMSAN state pointer is only read > once at the beginning of the function, touching it after |current| has > changed may be dangerous. > > Signed-off-by: Alexander Potapenko <glider@google.com> > To: Alexander Potapenko <glider@google.com> > Cc: Thomas Gleixner <tglx@linutronix.de> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: Vegard Nossum <vegard.nossum@oracle.com> > Cc: Dmitry Vyukov <dvyukov@google.com> > Cc: linux-mm@kvack.org > --- > v3: > - removed TODOs from comments > > Change-Id: I684d23dac5a22eb0a4cea71993cb934302b17cea > --- > arch/x86/entry/common.c | 1 + > arch/x86/include/asm/irq_regs.h | 1 + > arch/x86/include/asm/syscall_wrapper.h | 1 + > arch/x86/kernel/apic/apic.c | 1 + > arch/x86/kernel/dumpstack_64.c | 1 + > arch/x86/kernel/process_64.c | 5 +++++ > arch/x86/kernel/traps.c | 12 ++++++++++-- > arch/x86/kernel/uprobes.c | 7 ++++++- > kernel/profile.c | 1 + > kernel/sched/core.c | 6 ++++++ > 10 files changed, 33 insertions(+), 3 deletions(-) > > diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c > index 3f8e22615812..0dd5b2acb355 100644 > --- a/arch/x86/entry/common.c > +++ b/arch/x86/entry/common.c > @@ -275,6 +275,7 @@ __visible inline void syscall_return_slowpath(struct pt_regs *regs) > } > > #ifdef CONFIG_X86_64 > +__no_sanitize_memory > __visible void do_syscall_64(unsigned long nr, struct pt_regs *regs) > { > struct thread_info *ti; > diff --git a/arch/x86/include/asm/irq_regs.h b/arch/x86/include/asm/irq_regs.h > index 187ce59aea28..d65a00bd6f02 100644 > --- a/arch/x86/include/asm/irq_regs.h > +++ b/arch/x86/include/asm/irq_regs.h > @@ -14,6 +14,7 @@ > > DECLARE_PER_CPU(struct pt_regs *, irq_regs); > > +__no_sanitize_memory > static inline struct pt_regs *get_irq_regs(void) > { > return __this_cpu_read(irq_regs); > diff --git a/arch/x86/include/asm/syscall_wrapper.h b/arch/x86/include/asm/syscall_wrapper.h > index e046a405743d..43910ce1b53b 100644 > --- a/arch/x86/include/asm/syscall_wrapper.h > +++ b/arch/x86/include/asm/syscall_wrapper.h > @@ -159,6 +159,7 @@ > ALLOW_ERROR_INJECTION(__x64_sys##name, ERRNO); \ > static long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \ > static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\ > + __no_sanitize_memory \ > asmlinkage long __x64_sys##name(const struct pt_regs *regs) \ > { \ > return __se_sys##name(SC_X86_64_REGS_TO_ARGS(x,__VA_ARGS__));\ > diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c > index 9e2dd2b296cd..7b24bda22c38 100644 > --- a/arch/x86/kernel/apic/apic.c > +++ b/arch/x86/kernel/apic/apic.c > @@ -1118,6 +1118,7 @@ static void local_apic_timer_interrupt(void) > * [ if a single-CPU system runs an SMP kernel then we call the local > * interrupt as well. Thus we cannot inline the local irq ... ] > */ > +__no_sanitize_memory /* |regs| may be uninitialized */ The comment style around __no_sanitize_memory looks very different for different call sites, perhaps it makes sense to unify it somehow. > __visible void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs) > { > struct pt_regs *old_regs = set_irq_regs(regs); > diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c > index 753b8cfe8b8a..ba883d282a43 100644 > --- a/arch/x86/kernel/dumpstack_64.c > +++ b/arch/x86/kernel/dumpstack_64.c > @@ -143,6 +143,7 @@ static bool in_irq_stack(unsigned long *stack, struct stack_info *info) > return true; > } > > +__no_sanitize_memory > int get_stack_info(unsigned long *stack, struct task_struct *task, > struct stack_info *info, unsigned long *visit_mask) > { > diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c > index af64519b2695..70e33150a83a 100644 > --- a/arch/x86/kernel/process_64.c > +++ b/arch/x86/kernel/process_64.c > @@ -500,6 +500,11 @@ void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp) > * Kprobes not supported here. Set the probe on schedule instead. > * Function graph tracer not supported too. > */ > +/* > + * Avoid touching KMSAN state or reporting anything here, as __switch_to() does > + * weird things with tasks. > + */ > +__no_sanitize_memory > __visible __notrace_funcgraph struct task_struct * > __switch_to(struct task_struct *prev_p, struct task_struct *next_p) > { > diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c > index 4bb0f8447112..a94282d1f60b 100644 > --- a/arch/x86/kernel/traps.c > +++ b/arch/x86/kernel/traps.c > @@ -618,7 +618,10 @@ NOKPROBE_SYMBOL(do_int3); > * Help handler running on a per-cpu (IST or entry trampoline) stack > * to switch to the normal thread stack if the interrupted code was in > * user mode. The actual stack switch is done in entry_64.S > + * > + * This function switches the registers - don't instrument it with KMSAN! > */ > +__no_sanitize_memory > asmlinkage __visible notrace struct pt_regs *sync_regs(struct pt_regs *eregs) > { > struct pt_regs *regs = (struct pt_regs *)this_cpu_read(cpu_current_top_of_stack) - 1; > @@ -634,6 +637,11 @@ struct bad_iret_stack { > }; > > asmlinkage __visible notrace > +/* > + * Dark magic happening here, let's not instrument this function. > + * Also avoid copying any metadata by using raw __memmove(). > + */ > +__no_sanitize_memory > struct bad_iret_stack *fixup_bad_iret(struct bad_iret_stack *s) > { > /* > @@ -648,10 +656,10 @@ struct bad_iret_stack *fixup_bad_iret(struct bad_iret_stack *s) > (struct bad_iret_stack *)this_cpu_read(cpu_tss_rw.x86_tss.sp0) - 1; > > /* Copy the IRET target to the new stack. */ > - memmove(&new_stack->regs.ip, (void *)s->regs.sp, 5*8); > + __memmove(&new_stack->regs.ip, (void *)s->regs.sp, 5*8); > > /* Copy the remainder of the stack from the current stack. */ > - memmove(new_stack, s, offsetof(struct bad_iret_stack, regs.ip)); > + __memmove(new_stack, s, offsetof(struct bad_iret_stack, regs.ip)); Looks like this change should go into a separate patch. > > BUG_ON(!user_mode(&new_stack->regs)); > return new_stack; > diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c > index 8cd745ef8c7b..bcd4bf5a909f 100644 > --- a/arch/x86/kernel/uprobes.c > +++ b/arch/x86/kernel/uprobes.c > @@ -8,6 +8,7 @@ > * Jim Keniston > */ > #include <linux/kernel.h> > +#include <linux/kmsan-checks.h> > #include <linux/sched.h> > #include <linux/ptrace.h> > #include <linux/uprobes.h> > @@ -997,9 +998,13 @@ int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs) > int arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data) > { > struct die_args *args = data; > - struct pt_regs *regs = args->regs; > + struct pt_regs *regs; > int ret = NOTIFY_DONE; > > + kmsan_unpoison_shadow(args, sizeof(*args)); > + regs = args->regs; > + if (regs) > + kmsan_unpoison_shadow(regs, sizeof(*regs)); This one as well. > /* We are only interested in userspace traps */ > if (regs && !user_mode(regs)) > return NOTIFY_DONE; > diff --git a/kernel/profile.c b/kernel/profile.c > index af7c94bf5fa1..835a5b66d1a4 100644 > --- a/kernel/profile.c > +++ b/kernel/profile.c > @@ -399,6 +399,7 @@ void profile_hits(int type, void *__pc, unsigned int nr_hits) > } > EXPORT_SYMBOL_GPL(profile_hits); > > +__no_sanitize_memory > void profile_tick(int type) > { > struct pt_regs *regs = get_irq_regs(); > diff --git a/kernel/sched/core.c b/kernel/sched/core.c > index dd05a378631a..674d36fe9d44 100644 > --- a/kernel/sched/core.c > +++ b/kernel/sched/core.c > @@ -475,6 +475,7 @@ void wake_q_add_safe(struct wake_q_head *head, struct task_struct *task) > put_task_struct(task); > } > > +__no_sanitize_memory /* context switching here */ > void wake_up_q(struct wake_q_head *head) > { > struct wake_q_node *node = head->first; > @@ -3180,6 +3181,7 @@ prepare_task_switch(struct rq *rq, struct task_struct *prev, > * past. prev == current is still correct but we need to recalculate this_rq > * because prev may have moved to another CPU. > */ > +__no_sanitize_memory /* |current| changes here */ > static struct rq *finish_task_switch(struct task_struct *prev) > __releases(rq->lock) > { > @@ -3986,6 +3988,7 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf) > * > * WARNING: must be called with preemption disabled! > */ > +__no_sanitize_memory /* |current| changes here */ > static void __sched notrace __schedule(bool preempt) > { > struct task_struct *prev, *next; > @@ -4605,6 +4608,7 @@ int task_prio(const struct task_struct *p) > * > * Return: 1 if the CPU is currently idle. 0 otherwise. > */ > +__no_sanitize_memory /* nothing to report here */ > int idle_cpu(int cpu) > { > struct rq *rq = cpu_rq(cpu); > @@ -6544,6 +6548,7 @@ static struct kmem_cache *task_group_cache __read_mostly; > DECLARE_PER_CPU(cpumask_var_t, load_balance_mask); > DECLARE_PER_CPU(cpumask_var_t, select_idle_mask); > > +__no_sanitize_memory > void __init sched_init(void) > { > unsigned long ptr = 0; > @@ -6716,6 +6721,7 @@ static inline int preempt_count_equals(int preempt_offset) > return (nested == preempt_offset); > } > > +__no_sanitize_memory /* expect the arguments to be initialized */ > void __might_sleep(const char *file, int line, int preempt_offset) > { > /* > -- > 2.24.0.432.g9d3f5f5b63-goog >
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 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 [this message] 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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