linux-kernel - Re: [PATCH 4/4] test: validate sysctl_writes

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Date:	Mon, 5 May 2014 18:29:49 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Randy Dunlap <rdunlap@...radead.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>, Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>,
	Aaron Tomlin <atomlin@...hat.com>,
	Li Zefan <lizefan@...wei.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Ryan Mallon <rmallon@...il.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Dario Faggioli <raistlin@...ux.it>, Jens Axboe <axboe@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Michael Ellerman <michael@...erman.id.au>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH 4/4] test: validate sysctl_writes_strict

On Sat, May 3, 2014 at 7:42 AM, Randy Dunlap <rdunlap@...radead.org> wrote:
> On 05/01/2014 02:26 PM, Kees Cook wrote:
>>
>> This adds several behavioral tests to sysctl string and number writing
>> to detect unexpected cases that behaved differently when the sysctl
>> kernel.sysctl_writes_strict != 1.
>>
>>
>> Signed-off-by: Kees Cook <keescook@...omium.org>
>> ---
>>   kernel/sysctl.c                                 |    4 +-
>>   tools/testing/selftests/Makefile                |    1 +
>>   tools/testing/selftests/sysctl/Makefile         |   19 ++++
>>   tools/testing/selftests/sysctl/common_tests     |  109
>> +++++++++++++++++++++++
>>   tools/testing/selftests/sysctl/run_numerictests |   10 +++
>>   tools/testing/selftests/sysctl/run_stringtests  |   77 ++++++++++++++++
>>   6 files changed, 218 insertions(+), 2 deletions(-)
>>   create mode 100644 tools/testing/selftests/sysctl/Makefile
>>   create mode 100644 tools/testing/selftests/sysctl/common_tests
>>   create mode 100644 tools/testing/selftests/sysctl/run_numerictests
>>   create mode 100644 tools/testing/selftests/sysctl/run_stringtests
>>
>> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
>> index d5bee7949e4a..51bbf904d694 100644
>> --- a/kernel/sysctl.c
>> +++ b/kernel/sysctl.c
>> @@ -1783,8 +1783,8 @@ static int _proc_do_string(char *data, int maxlen,
>> int write,
>>
>>   static void warn_sysctl_write(struct ctl_table *table)
>>   {
>> -       pr_warn("%s wrote to %s when file position was not 0!\n",
>> -               current->task_comm, table->procname);
>> +       pr_warn("write to %s by %s used a non-zero file position!\n",
>> +               table->procname, current->comm);
>>         pr_warn("This will not be supported in the future.\n");
>>         pr_warn("To silence warning, set kernel.sysctl_writes_strict =
>> -1\n");
>>   }
>
>
> Why is this patch part of the test patch?

Oops, thanks. Yeah, that snuck into the wrong patch.

-Kees

-- 
Kees Cook
Chrome OS Security
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