From: Walter Wu <walter-zh.wu@mediatek.com>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Next Mailing List <linux-next@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
kasan-dev <kasan-dev@googlegroups.com>
Subject: Re: linux-next: build warning after merge of the akpm-current tree
Date: Sat, 7 Mar 2020 13:03:56 +0800 [thread overview]
Message-ID: <1583557436.8911.25.camel@mtksdccf07> (raw)
In-Reply-To: <CACT4Y+ZX0xaZNnNqOzassKi2=NSPz-9K4VpxdL6FGx_Y4vWSUg@mail.gmail.com>
On Thu, 2020-03-05 at 06:54 +0100, Dmitry Vyukov wrote:
> On Thu, Mar 5, 2020 at 6:37 AM Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> >
> > Hi all,
> >
> > After merging the akpm-current tree, today's linux-next build (x86_64
> > allmodconfig) produced this warning:
> >
> > mm/kasan/common.o: warning: objtool: kasan_report()+0x17: call to report_enabled() with UACCESS enabled
> > In file included from include/linux/bitmap.h:9,
> > from include/linux/cpumask.h:12,
> > from arch/x86/include/asm/paravirt.h:17,
> > from arch/x86/include/asm/irqflags.h:72,
> > from include/linux/irqflags.h:16,
> > from include/linux/rcupdate.h:26,
> > from include/linux/rculist.h:11,
> > from include/linux/pid.h:5,
> > from include/linux/sched.h:14,
> > from include/linux/uaccess.h:6,
> > from arch/x86/include/asm/fpu/xstate.h:5,
> > from arch/x86/include/asm/pgtable.h:26,
> > from include/linux/kasan.h:15,
> > from lib/test_kasan.c:12:
> > In function 'memmove',
> > inlined from 'kmalloc_memmove_invalid_size' at lib/test_kasan.c:301:2:
> > include/linux/string.h:441:9: warning: '__builtin_memmove' specified bound 18446744073709551614 exceeds maximum object size 9223372036854775807 [-Wstringop-overflow=]
>
> +kasan-dev
>
> We probably need to make this 18446744073709551614 constant "dynamic"
> so that compiler does not see it.
>
> Walter, will you take a look? Thanks
Hi Dmitry,
Yes, I have fixed it. This warning need newer gcc enough to reproduce.
Maybe I should replace original gcc-7.4.0.
Thanks.
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -286,17 +286,19 @@ static noinline void __init
kmalloc_oob_in_memset(void)
static noinline void __init kmalloc_memmove_invalid_size(void)
{
char *ptr;
- size_t size = 64;
+ size_t size1 = 64;
+ volatile size_t size2 = -2;
pr_info("invalid size in memmove\n");
- ptr = kmalloc(size, GFP_KERNEL);
+ ptr = kmalloc(size1, GFP_KERNEL);
if (!ptr) {
pr_err("Allocation failed\n");
return;
}
- memset((char *)ptr, 0, 64);
- memmove((char *)ptr, (char *)ptr + 4, -2);
+ memset((char *)ptr, 0, size1);
+ /* the size of memmove() is negative number */
+ memmove((char *)ptr, (char *)ptr + 4, size2);
kfree(ptr);
}
>
> > 441 | return __builtin_memmove(p, q, size);
> > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > Introduced by commit
> >
> > 519e500fac64 ("kasan: add test for invalid size in memmove")
> >
> > That's a bit annoying during a normal x86_64 allmodconfig build ...
> >
> > --
> > Cheers,
> > Stephen Rothwell
next prev parent reply other threads:[~2020-03-07 5:04 UTC|newest]
Thread overview: 157+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-05 5:37 linux-next: build warning after merge of the akpm-current tree Stephen Rothwell
2020-03-05 5:54 ` Dmitry Vyukov
2020-03-07 5:03 ` Walter Wu [this message]
2020-03-05 8:54 ` Walter Wu
2020-03-05 9:33 ` Stephen Rothwell
2020-03-06 18:59 ` Walter Wu
2020-03-06 20:45 ` Walter Wu
-- strict thread matches above, loose matches on Subject: below --
2022-04-27 6:41 Stephen Rothwell
2022-04-27 14:15 ` Liam Howlett
2022-04-13 5:15 Stephen Rothwell
2022-04-13 6:20 ` Yu Zhao
2022-02-09 5:58 Stephen Rothwell
2022-02-09 8:09 ` Huang, Ying
2022-02-07 4:06 Stephen Rothwell
2022-02-02 3:54 Stephen Rothwell
2022-02-03 23:06 ` Andrew Morton
2022-02-03 23:21 ` Randy Dunlap
2022-01-06 15:45 Stephen Rothwell
2021-12-23 23:12 Stephen Rothwell
2021-11-23 5:26 Stephen Rothwell
2021-11-23 8:38 ` Suren Baghdasaryan
2021-11-23 19:03 ` Suren Baghdasaryan
2021-11-23 22:26 ` Stephen Rothwell
2021-11-23 22:30 ` Suren Baghdasaryan
2021-07-19 7:52 Stephen Rothwell
2021-07-19 8:47 ` Feng Tang
2021-05-21 5:39 Stephen Rothwell
2021-05-21 6:53 ` Miaohe Lin
2021-03-30 20:04 Stephen Rothwell
2021-03-15 5:35 Stephen Rothwell
2021-03-16 18:18 ` Minchan Kim
2021-03-16 21:49 ` Stephen Rothwell
2021-03-16 23:09 ` Jonathan Corbet
2021-03-17 13:22 ` Mauro Carvalho Chehab
2020-12-10 9:38 Stephen Rothwell
2020-12-10 16:05 ` Georgi Djakov
2020-11-13 6:01 Stephen Rothwell
2020-11-16 10:03 ` Andy Shevchenko
2020-11-06 6:26 Stephen Rothwell
2020-11-05 6:45 Stephen Rothwell
2020-11-05 7:03 ` Mike Rapoport
2020-11-05 7:42 ` Anand K. Mistry
2020-11-05 7:45 ` Anand K. Mistry
2020-11-05 9:17 ` Mike Rapoport
2020-11-05 8:00 ` Stephen Rothwell
2020-11-05 8:03 ` Stephen Rothwell
2020-09-14 7:00 Stephen Rothwell
2020-09-15 4:03 ` David Gow
2020-09-15 4:16 ` Stephen Rothwell
2020-09-15 9:57 ` Marco Elver
2020-09-14 6:57 Stephen Rothwell
2020-07-17 10:31 Stephen Rothwell
2020-07-17 17:47 ` Roman Gushchin
2020-07-09 9:11 Stephen Rothwell
2020-06-21 14:40 Stephen Rothwell
2020-03-31 8:56 Stephen Rothwell
2020-04-01 22:58 ` Andrew Morton
2020-04-01 23:00 ` Jason Gunthorpe
2020-04-01 23:06 ` Mike Kravetz
2020-03-13 10:42 Stephen Rothwell
2020-03-13 10:55 ` Baoquan He
2020-03-13 12:56 ` Baoquan He
2020-03-14 0:09 ` Stephen Rothwell
2020-03-14 0:35 ` Baoquan He
2020-03-16 4:58 ` Baoquan He
2020-03-16 6:13 ` Stephen Rothwell
2020-03-16 6:51 ` Baoquan He
2020-03-16 6:54 ` Stephen Rothwell
2020-03-12 7:31 Stephen Rothwell
2020-03-12 16:48 ` Mike Kravetz
2020-03-12 7:27 Stephen Rothwell
2020-03-13 0:31 ` Andrew Morton
2020-02-17 2:00 Stephen Rothwell
2019-11-06 7:05 Stephen Rothwell
2019-11-06 7:52 ` Shaokun Zhang
2019-11-06 6:54 Stephen Rothwell
2019-08-07 8:00 Stephen Rothwell
2019-08-07 11:29 ` Rikard Falkeborn
2019-08-07 23:31 ` Stephen Rothwell
2019-07-31 6:16 Stephen Rothwell
2019-07-31 12:01 ` Jia-Ju Bai
2019-07-31 6:11 Stephen Rothwell
2019-07-31 6:28 ` Miles Chen
2019-08-01 5:51 ` Stephen Rothwell
2019-08-01 6:15 ` Michal Hocko
2019-08-01 6:30 ` Miles Chen
2019-08-01 6:38 ` Michal Hocko
2019-08-01 6:39 ` Stephen Rothwell
2019-08-01 6:42 ` Miles Chen
2019-07-29 3:48 Stephen Rothwell
2019-07-29 3:44 Stephen Rothwell
2019-05-30 4:55 Stephen Rothwell
2019-05-30 9:02 ` Matteo Croce
2019-03-29 2:39 Stephen Rothwell
2019-04-16 6:52 ` Stephen Rothwell
2019-04-16 22:45 ` Andrew Morton
2019-01-31 5:01 Stephen Rothwell
2018-06-08 4:45 Stephen Rothwell
2018-05-04 4:17 Stephen Rothwell
2018-05-04 15:39 ` Randy Dunlap
2018-05-07 14:10 ` Minchan Kim
2018-05-07 16:47 ` Randy Dunlap
2018-05-08 10:48 ` Minchan Kim
2018-04-06 4:53 Stephen Rothwell
2018-01-02 7:04 Stephen Rothwell
2017-12-15 2:48 Stephen Rothwell
2017-11-23 2:01 Stephen Rothwell
2017-11-13 5:54 Stephen Rothwell
2017-11-13 5:42 Stephen Rothwell
2017-11-13 8:09 ` Michal Hocko
2017-11-13 8:23 ` Michal Hocko
2017-11-13 11:43 ` Arnd Bergmann
2017-11-13 11:54 ` Michal Hocko
2017-11-13 12:24 ` Arnd Bergmann
2017-11-13 12:29 ` Michal Hocko
2017-11-16 22:44 ` Stephen Rothwell
2017-11-17 3:53 ` Stephen Rothwell
2017-11-17 9:36 ` Zhangshaokun
2017-11-17 9:56 ` Arnd Bergmann
2017-08-01 5:22 Stephen Rothwell
2017-05-26 2:43 Stephen Rothwell
2017-05-26 10:16 ` Jeff Layton
2017-05-26 11:28 ` Dave Kleikamp
2017-05-19 4:44 Stephen Rothwell
2017-05-15 1:56 Stephen Rothwell
2017-05-15 4:02 ` Xunlei Pang
2017-05-15 5:07 ` Stephen Rothwell
2017-02-02 6:49 Stephen Rothwell
2016-11-09 4:10 Stephen Rothwell
2016-11-09 7:18 ` Huang Shijie
2016-11-09 21:21 ` Andrew Morton
2016-11-10 2:56 ` Stephen Rothwell
2016-06-23 6:53 Stephen Rothwell
2016-06-23 14:00 ` Mel Gorman
2016-05-27 3:07 Stephen Rothwell
2016-05-27 19:53 ` Andrew Morton
2016-04-29 6:45 Stephen Rothwell
2016-04-29 6:55 ` Stephen Rothwell
2016-04-29 13:32 ` Josh Poimboeuf
2016-04-29 14:03 ` Josh Poimboeuf
2016-04-30 5:52 ` Stephen Rothwell
2015-07-16 5:26 Stephen Rothwell
2015-07-16 23:00 ` Andrew Morton
2015-06-04 12:29 Stephen Rothwell
2015-06-04 13:56 ` Andrea Arcangeli
2015-02-04 7:48 Stephen Rothwell
2015-02-04 7:53 ` Jan Kiszka
2015-01-19 7:45 Stephen Rothwell
2015-01-19 15:50 ` Chris Mason
2014-10-30 5:19 Stephen Rothwell
2014-10-30 9:00 ` Aneesh Kumar K.V
2014-09-26 10:42 Stephen Rothwell
2014-09-29 21:30 ` Andrew Morton
2014-09-08 8:57 Stephen Rothwell
2014-06-20 5:27 Stephen Rothwell
2014-06-20 5:29 ` Yinghai Lu
2014-06-16 1:57 Stephen Rothwell
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