From: Jiri Slaby <jslaby@suse.cz>
To: Thomas Gleixner <tglx@linutronix.de>, Will Deacon <will.deacon@arm.com>
Cc: mingo@redhat.com, peterz@infradead.org, dvhart@infradead.org,
linux-kernel@vger.kernel.org, Richard Henderson <rth@twiddle.net>,
Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
Matt Turner <mattst88@gmail.com>,
Vineet Gupta <vgupta@synopsys.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Richard Kuo <rkuo@codeaurora.org>,
Tony Luck <tony.luck@intel.com>,
Fenghua Yu <fenghua.yu@intel.com>,
Michal Simek <monstr@monstr.eu>,
Ralf Baechle <ralf@linux-mips.org>,
Jonas Bonn <jonas@southpole.se>,
Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
Stafford Horne <shorne@gmail.com>,
"James E.J. Bottomley" <jejb@parisc-linux.org>,
Helge Deller <deller@gmx.de>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Rich Felker <dalias@libc.org>,
"David S. Miller" <davem@davemloft.net>,
"H. Peter Anvin" <hpa@zytor.com>, Chris Zankel <chris@zankel.net>,
Max Filippov <jcmvbkbc@gmail.com>, Arnd Bergmann <arnd@arndb.de>,
x86@kernel.org, linux-alpha@vger.kernel.org,
linux-snps-arc@lists.infradead.org,
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linux-arch@vger.kernel.org
Subject: Re: [PATCH 1/1] futex: remove duplicated code and fix UB
Date: Mon, 26 Jun 2017 14:02:31 +0200 [thread overview]
Message-ID: <80af8d81-4522-de2d-8289-1ab46565505a@suse.cz> (raw)
In-Reply-To: <alpine.DEB.2.20.1706230017520.2221@nanos>
On 06/23/2017, 09:51 AM, Thomas Gleixner wrote:
> On Wed, 21 Jun 2017, Jiri Slaby wrote:
>> diff --git a/arch/arm64/include/asm/futex.h b/arch/arm64/include/asm/futex.h
>> index f32b42e8725d..5bb2fd4674e7 100644
>> --- a/arch/arm64/include/asm/futex.h
>> +++ b/arch/arm64/include/asm/futex.h
>> @@ -48,20 +48,10 @@ do { \
>> } while (0)
>>
>> static inline int
>> -futex_atomic_op_inuser(unsigned int encoded_op, u32 __user *uaddr)
>
> That unsigned int seems to be a change from the arm64 tree in next. It's
> not upstream and it'll cause a (easy to resolve) conflict.
Ugh, I thought the arm64 is in upstream already. Note that this patch
just takes what is in this arm64 fix and makes it effective for all
architectures. So I will wait with v2 until it merges upstream.
So, Will, will you incorporate Thomas' comments into your arm64 fix?
...
> Yes, we probably can't change that anymore, but at least we should make it
> very explicit and add a comment to that effect.
Something like this or do you want a comment yet?
unsigned int op = (encoded_op & 0x70000000) >> 28;
unsigned int cmp = (encoded_op & 0x0f000000) >> 24;
int oparg = sign_extend32((encoded_op & 0x00fff000) >> 12, 12);
int cmparg = sign_extend32(encoded_op & 0x00000fff, 12);
thanks,
--
js
suse labs
next prev parent reply other threads:[~2017-06-26 12:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-21 11:53 [PATCH 1/1] futex: remove duplicated code and fix UB Jiri Slaby
2017-06-22 3:53 ` Darren Hart
2017-06-23 7:51 ` Thomas Gleixner
2017-06-26 12:02 ` Jiri Slaby [this message]
2017-06-26 12:08 ` Will Deacon
2017-07-03 10:18 ` Thomas Gleixner
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