linux-kernel - Re: [PATCH 2/3] x86/asm/entry/32: Remove most of SYSCALL32 code, part 1

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Message-ID: <CALCETrUCAeG6BBXqfiQz4+XN6d0XbmW-6V9cRTgjtBV=2PGsiw@mail.gmail.com>
Date:	Mon, 27 Jul 2015 12:26:15 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Krzysztof A. Sobiecki" <sobkas@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>, Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] x86/asm/entry/32: Remove most of SYSCALL32 code, part 1

On Mon, Jul 27, 2015 at 12:19 PM, Denys Vlasenko <dvlasenk@...hat.com> wrote:
> On 07/24/2015 07:50 PM, Andy Lutomirski wrote:
>> On Fri, Jul 24, 2015 at 6:47 AM, Denys Vlasenko <dvlasenk@...hat.com> wrote:
>>> SYSCALL32 code is nearly identical to SYSCALL32, except for initial
>>> section. Merge them.
>>>
>>> The removal is split into two parts, to make review eaiser. This is part 1.
>>>
>>> auditsys_entry_common and auditsys_exit macros are indented one more tab without
>>> any changes. This prevents diff from becoming unreadable.
>>> They will be removed in part 2.
>>
>> I need to read these more closely, which is, at present, exceeding my
>> ability to look at asm.  (See the big NMI thread.)  I'll look soon.
>>
>> Meanwhile, this code is incredibly fragile wrt syscall restart.
>> (Syscall restart on compat is really weird.)  Do we have a decent test
>> for it?
>
> How about this? (Feel free to expand, this is a first cut only).

On a very brief glance, it looks reasonable, but I'd try it with
recvfrom instead of recv because it's a six-argument syscall.

--Andy
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