From: Andrey Ryabinin <aryabinin@virtuozzo.com>
To: Marco Elver <elver@google.com>,
peterz@infradead.org, dvyukov@google.com, glider@google.com,
andreyknvl@google.com, mark.rutland@arm.com, hpa@zytor.com
Cc: corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com,
bp@alien8.de, x86@kernel.org, arnd@arndb.de, jpoimboe@redhat.com,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, kasan-dev@googlegroups.com
Subject: Re: [PATCH v3 2/3] x86: Use static_cpu_has in uaccess region to avoid instrumentation
Date: Thu, 13 Jun 2019 13:50:40 +0300 [thread overview]
Message-ID: <d3f70d55-0308-a2e2-0f4a-1bdf6bcde544@virtuozzo.com> (raw)
In-Reply-To: <20190531150828.157832-3-elver@google.com>
On 5/31/19 6:08 PM, Marco Elver wrote:
> This patch is a pre-requisite for enabling KASAN bitops instrumentation;
> using static_cpu_has instead of boot_cpu_has avoids instrumentation of
> test_bit inside the uaccess region. With instrumentation, the KASAN
> check would otherwise be flagged by objtool.
>
> For consistency, kernel/signal.c was changed to mirror this change,
> however, is never instrumented with KASAN (currently unsupported under
> x86 32bit).
>
> Signed-off-by: Marco Elver <elver@google.com>
> Suggested-by: H. Peter Anvin <hpa@zytor.com>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
next prev parent reply other threads:[~2019-06-13 10:50 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-31 15:08 [PATCH v3 0/3] Bitops instrumentation for KASAN Marco Elver
2019-05-31 15:08 ` Marco Elver
2019-05-31 15:08 ` [PATCH v3 1/3] lib/test_kasan: Add bitops tests Marco Elver
2019-05-31 15:08 ` Marco Elver
2019-05-31 15:57 ` Mark Rutland
2019-05-31 15:57 ` Mark Rutland
2019-06-13 10:49 ` Andrey Ryabinin
2019-06-13 10:49 ` Andrey Ryabinin
2019-06-13 12:35 ` Marco Elver
2019-06-13 12:35 ` Marco Elver
2019-05-31 15:08 ` [PATCH v3 2/3] x86: Use static_cpu_has in uaccess region to avoid instrumentation Marco Elver
2019-05-31 15:08 ` Marco Elver
2019-06-07 9:43 ` Marco Elver
2019-06-07 9:43 ` Marco Elver
2019-06-12 14:12 ` Dmitry Vyukov
2019-06-12 14:12 ` Dmitry Vyukov
2019-06-13 9:21 ` Peter Zijlstra
2019-06-13 9:21 ` Peter Zijlstra
2019-06-13 10:50 ` Andrey Ryabinin [this message]
2019-06-13 10:50 ` Andrey Ryabinin
2019-05-31 15:08 ` [PATCH v3 3/3] asm-generic, x86: Add bitops instrumentation for KASAN Marco Elver
2019-05-31 15:08 ` Marco Elver
2019-05-31 16:01 ` Mark Rutland
2019-05-31 16:01 ` Mark Rutland
2019-06-13 10:51 ` Andrey Ryabinin
2019-06-13 10:51 ` Andrey Ryabinin
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