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From: Dmitry Vyukov <dvyukov@google.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	kasan-dev <kasan-dev@googlegroups.com>,
	Alexander Potapenko <glider@google.com>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	netdev <netdev@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Arend van Spriel <arend.vanspriel@broadcom.com>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Michal Marek <mmarek@suse.com>, Kees Cook <keescook@chromium.org>,
	Ingo Molnar <mingo@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	"open list:KERNEL BUILD + fi..." <linux-kbuild@vger.kernel.org>
Subject: Re: [PATCH v2 11/11] kasan: rework Kconfig settings
Date: Fri, 16 Jun 2017 13:44:50 +0200	[thread overview]
Message-ID: <CACT4Y+ZGbvy5jK=ouHxgcSKkCdvJBM6=4Gkd1sGvzOZvKg79GQ@mail.gmail.com> (raw)
In-Reply-To: <CAK8P3a18fdnNNSMdxCG13LTFQwQgYmr9ZiBp_r86M5KyFKFqHA@mail.gmail.com>

On Fri, Jun 16, 2017 at 1:42 PM, Arnd Bergmann <arnd@arndb.de> wrote:
>>> diff --git a/lib/Kconfig.kmemcheck b/lib/Kconfig.kmemcheck
>>> index 846e039a86b4..58b9f3f81dc8 100644
>>> --- a/lib/Kconfig.kmemcheck
>>> +++ b/lib/Kconfig.kmemcheck
>>> @@ -7,6 +7,7 @@ menuconfig KMEMCHECK
>>>         bool "kmemcheck: trap use of uninitialized memory"
>>>         depends on DEBUG_KERNEL
>>>         depends on !X86_USE_3DNOW
>>> +       depends on !KASAN_EXTRA
>>
>>
>> KASAN is not meant to work with KMEMCHECK. I am not sure if it even
>> works, and it's definitely unmaintained. Even if it works now, I am
>> not sure what could be the intention of somebody running that
>> combination.
>> So I think we should do: depends on !KASAN
>> Will it make things simper for you?
>
> I don't think it will change anything for me, other than having to respin the
> patch series or adding a patch on top.
>
> I have just checked that KMEMCHECK is already disabled in allmodconfig,
> and all but one of the warnings I address in the series show up in
> allmodconfig too.

Ack.

We can disable it if/when KASAN+KMEMCHECK combination requires any
additional work, or causes user confusion.

      reply	other threads:[~2017-06-16 11:45 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-14 21:15 [PATCH v2 00/11] bring back stack frame warning with KASAN Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 01/11] compiler: introduce noinline_if_stackbloat annotation Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 02/11] netlink: mark nla_put_{u8,u16,u32} noinline_if_stackbloat Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 03/11] tty: kbd: reduce stack size with KASAN Arnd Bergmann
2017-06-14 21:28   ` Samuel Thibault
2017-06-14 21:56     ` Arnd Bergmann
2017-06-14 22:16       ` Samuel Thibault
2017-06-15  4:52   ` Greg Kroah-Hartman
2017-06-15  4:53     ` Greg Kroah-Hartman
2017-06-16 12:01       ` Arnd Bergmann
2017-06-16 13:02         ` Greg Kroah-Hartman
2017-06-16 15:41           ` Arnd Bergmann
2017-06-16 15:58             ` Samuel Thibault
2017-06-16 17:29               ` Dmitry Torokhov
2017-06-16 20:56                 ` Arnd Bergmann
2017-06-16 21:07                   ` Dmitry Torokhov
2017-06-16 17:14             ` Andrey Ryabinin
2017-06-14 21:15 ` [PATCH v2 04/11] rocker: mark rocker_tlv_put_* functions as noinline_if_stackbloat Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 05/11] mtd: cfi: reduce stack size with KASAN Arnd Bergmann
2017-06-14 21:15   ` Arnd Bergmann
2017-08-04  7:42   ` Boris Brezillon
2017-08-04  9:09     ` Arnd Bergmann
2017-08-04 10:56       ` Boris Brezillon
2017-08-04 10:57   ` Boris Brezillon
2017-06-14 21:15 ` [PATCH v2 06/11] dvb-frontends: reduce stack size in i2c access Arnd Bergmann
2017-06-24 19:49   ` Mauro Carvalho Chehab
2017-06-14 21:15 ` [PATCH v2 07/11] r820t: mark register functions as noinline_if_stackbloat Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 08/11] brcmsmac: make some local variables 'static const' to reduce stack size Arnd Bergmann
2017-06-15 14:56   ` Kalle Valo
2017-06-14 21:15 ` [PATCH v2 09/11] brcmsmac: split up wlc_phy_workarounds_nphy Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 10/11] brcmsmac: reindent split functions Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 11/11] kasan: rework Kconfig settings Arnd Bergmann
2017-06-15  7:02   ` Dmitry Vyukov
2017-06-16 11:42     ` Arnd Bergmann
2017-06-16 11:44       ` Dmitry Vyukov [this message]

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