From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yb1-f197.google.com (mail-yb1-f197.google.com [209.85.219.197]) by kanga.kvack.org (Postfix) with ESMTP id 0D2C28E00E5 for ; Wed, 12 Dec 2018 13:36:02 -0500 (EST) Received: by mail-yb1-f197.google.com with SMTP id y67so6332072yby.11 for ; Wed, 12 Dec 2018 10:36:02 -0800 (PST) Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id j12sor3350949ywg.21.2018.12.12.10.36.00 for (Google Transport Security); Wed, 12 Dec 2018 10:36:00 -0800 (PST) MIME-Version: 1.0 References: <20181211103733.22284-1-anders.roxell@linaro.org> In-Reply-To: From: Anders Roxell Date: Wed, 12 Dec 2018 19:35:48 +0100 Message-ID: Subject: Re: [PATCH] kasan: mark kasan_check_(read|write) as 'notrace' Content-Type: text/plain; charset="UTF-8" Sender: owner-linux-mm@kvack.org List-ID: To: Dmitry Vyukov Cc: aryabinin@virtuozzo.com, kasan-dev@googlegroups.com, linux-mm@kvack.org, Linux Kernel Mailing List , rostedt@goodmis.org On Tue, 11 Dec 2018 at 11:55, Dmitry Vyukov wrote: > > On Tue, Dec 11, 2018 at 11:37 AM Anders Roxell wrote: > > > > When option CONFIG_KASAN is enabled toghether with ftrace, function > > ftrace_graph_caller() gets in to a recursion, via functions > > kasan_check_read() and kasan_check_write(). > > > > Breakpoint 2, ftrace_graph_caller () at ../arch/arm64/kernel/entry-ftrace.S:179 > > 179 mcount_get_pc x0 // function's pc > > (gdb) bt > > #0 ftrace_graph_caller () at ../arch/arm64/kernel/entry-ftrace.S:179 > > #1 0xffffff90101406c8 in ftrace_caller () at ../arch/arm64/kernel/entry-ftrace.S:151 > > #2 0xffffff90106fd084 in kasan_check_write (p=0xffffffc06c170878, size=4) at ../mm/kasan/common.c:105 > > #3 0xffffff90104a2464 in atomic_add_return (v=, i=) at ./include/generated/atomic-instrumented.h:71 > > #4 atomic_inc_return (v=) at ./include/generated/atomic-fallback.h:284 > > #5 trace_graph_entry (trace=0xffffffc03f5ff380) at ../kernel/trace/trace_functions_graph.c:441 > > #6 0xffffff9010481774 in trace_graph_entry_watchdog (trace=) at ../kernel/trace/trace_selftest.c:741 > > #7 0xffffff90104a185c in function_graph_enter (ret=, func=, frame_pointer=18446743799894897728, retp=) at ../kernel/trace/trace_functions_graph.c:196 > > #8 0xffffff9010140628 in prepare_ftrace_return (self_addr=18446743592948977792, parent=0xffffffc03f5ff418, frame_pointer=18446743799894897728) at ../arch/arm64/kernel/ftrace.c:231 > > #9 0xffffff90101406f4 in ftrace_graph_caller () at ../arch/arm64/kernel/entry-ftrace.S:182 > > Backtrace stopped: previous frame identical to this frame (corrupt stack?) > > (gdb) > > > > Rework so that kasan_check_read() and kasan_check_write() is marked with > > 'notrace'. > > > > Signed-off-by: Anders Roxell > > --- > > mm/kasan/common.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/mm/kasan/common.c b/mm/kasan/common.c > > index 03d5d1374ca7..71507d15712b 100644 > > --- a/mm/kasan/common.c > > +++ b/mm/kasan/common.c > > @@ -95,13 +95,13 @@ void kasan_disable_current(void) > > current->kasan_depth--; > > } > > > > -void kasan_check_read(const volatile void *p, unsigned int size) > > +void notrace kasan_check_read(const volatile void *p, unsigned int size) > > { > > check_memory_region((unsigned long)p, size, false, _RET_IP_); > > } > > EXPORT_SYMBOL(kasan_check_read); > > > > -void kasan_check_write(const volatile void *p, unsigned int size) > > +void notrace kasan_check_write(const volatile void *p, unsigned int size) > > { > > check_memory_region((unsigned long)p, size, true, _RET_IP_); > > } > > Hi Anders, > > Thanks for fixing this! > > I wonder if there is some compiler/make flag to turn this off for the > whole file? > > We turn as much instrumentation as possible already for this file in Makefile: > > KASAN_SANITIZE := n > UBSAN_SANITIZE_kasan.o := n > KCOV_INSTRUMENT := n > CFLAGS_REMOVE_kasan.o = -pg > CFLAGS_kasan.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector) > > These functions call check_memory_region, which is presumably inlined. > But if it's not inlined later in some configuration, or we just > shuffle code a bit, we can get the same problem again. Thank you for the review. I'll send out a v2 shortly where I turned off the hole file. Cheers, Anders