linux-kernel - Re: [PATCH v4] x86, selftests: Add sigreturn selftest

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Message-ID: <CALCETrUg4dgnLa7NTtpz4qPjf3rTZEZZD2Kc7J6hbEjUtTzr9Q@mail.gmail.com>
Date:	Mon, 6 Apr 2015 23:11:35 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...nel.org>,
	X86 ML <x86@...nel.org>, Shuah Khan <shuah.kh@...sung.com>,
	Borislav Petkov <bp@...en8.de>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] x86, selftests: Add sigreturn selftest

On Mon, Apr 6, 2015 at 8:39 PM, Michael Ellerman <mpe@...erman.id.au> wrote:
> On Mon, 2015-04-06 at 19:01 -0700, Andy Lutomirski wrote:
>> This is my sigreturn test, added mostly unchanged from its old home.
>> It exercises the sigreturn(2) syscall, specifically focusing on its
>> interactions with various IRET corner cases.  It tests for correct
>> behavior in several areas that were historically dangerously buggy.
>> For example, it exercises espfix on kernels of both bitnesses under
>> various conditions, and it contains exploits for several now-fixed
>> bugs in IRET error handling.
>>
>> If you run it on older kernels, your system will crash.  It probably
>> won't eat your data in the process.
>>
>> There is no released kernel on which the sigreturn_64 test will
>> pass, but it passes on tip:x86/asm.
>>
>> IMO it's unfortunate that I need to provide a special script to run
>> tests.  I'd rather just list my targets.
>
> If you use lib.mk you can.
>
>   https://git.kernel.org/cgit/linux/kernel/git/shuah/linux-kselftest.git/log/?h=next
>
> See for example:
>
>   https://git.kernel.org/cgit/linux/kernel/git/shuah/linux-kselftest.git/commit/?h=next&id=5744de542dd4b963c2975e6f70844ce2899864e4

Will do for 4.2.  In the mean time, there's no base on which lib.mk
exists and the test works.

--Andy

>
> cheers
>
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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