From: Andrey Ryabinin <aryabinin@virtuozzo.com>
To: Dmitry Vyukov <dvyukov@google.com>, Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
"x86@kernel.org" <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Andy Lutomirski <luto@amacapital.net>,
Andrey Konovalov <andreyknvl@google.com>,
Kostya Serebryany <kcc@google.com>,
Alexander Potapenko <glider@google.com>,
kasan-dev <kasan-dev@googlegroups.com>,
Borislav Petkov <bp@alien8.de>,
Denys Vlasenko <dvlasenk@redhat.com>,
Andi Kleen <ak@linux.intel.com>,
Sasha Levin <sasha.levin@oracle.com>,
Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] x86/process: Silence KASAN warnings in get_wchan()
Date: Mon, 5 Oct 2015 14:46:30 +0300 [thread overview]
Message-ID: <56126316.3030901@virtuozzo.com> (raw)
In-Reply-To: <CACT4Y+aOZjMB3b3AsPvREbr-5sV3N1Obh7rS+oOCUtCQeyT7VA@mail.gmail.com>
On 10/05/2015 02:39 PM, Dmitry Vyukov wrote:
>>
>> But that's all pretty disgusting really.
>>
>> Cannot we do better, such as annotating the function and then KASAN sorting out
>> its false positives, or something like that?
>
>
> We also plug __attribute__((no_sanitize_address)) on the function.
>
It's absolutely unusable:( https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
If we add it here, it won't built because of: '__always_inline __read_once_size()'
But, I think I have the solution.
We could have some blacklist - list of function names which we should be ignored.
In kasan_report() we could resolve return address to function name and compare it with name in list.
If name in list -> ignore report.
next prev parent reply other threads:[~2015-10-05 11:46 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-05 10:28 [PATCH] x86/process: Silence KASAN warnings in get_wchan() Andrey Ryabinin
2015-10-05 10:38 ` Dmitry Vyukov
2015-10-05 11:18 ` Borislav Petkov
2015-10-05 11:23 ` Ingo Molnar
2015-10-05 11:39 ` Dmitry Vyukov
2015-10-05 11:46 ` Andrey Ryabinin [this message]
2015-10-05 13:15 ` Borislav Petkov
2015-10-05 18:42 ` Andy Lutomirski
2015-10-05 16:39 ` Andi Kleen
2015-10-05 16:59 ` Andrey Ryabinin
2015-10-05 18:58 ` Andi Kleen
2015-10-06 7:26 ` Ingo Molnar
2015-10-06 7:38 ` Andrey Ryabinin
2015-10-06 18:11 ` Andy Lutomirski
2015-10-07 7:22 ` Ingo Molnar
2015-10-07 8:54 ` Andrey Ryabinin
2015-10-07 9:11 ` Andrey Ryabinin
2015-10-07 16:27 ` Andi Kleen
2015-10-07 18:48 ` Andrey Ryabinin
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