Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [PATCH ghak84 v4] audit: purge audit_log_string from the
 intra-kernel audit API
To:     Paul Moore <paul@paul-moore.com>,
        Richard Guy Briggs <rgb@redhat.com>
Cc:     Linux-Audit Mailing List <linux-audit@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux Security Module list 
        <linux-security-module@vger.kernel.org>,
        Eric Paris <eparis@parisplace.org>
References: <6effbbd4574407d6af21162e57d9102d5f8b02ed.1594664015.git.rgb@redhat.com>
 <CAHC9VhSyq7yKQqwvHL5syU9+TFki6-__WfCrvqewbnU3xpND4Q@mail.gmail.com>
 <20200714174353.ds7lj3iisy67t2zu@madcap2.tricolour.ca>
 <CAHC9VhQusQsdQc7EfdjdH5mp6qqqYVPHnG9nNhUhf3DS_cdWwA@mail.gmail.com>
 <20200714210027.me2ieywjfcsf4v5r@madcap2.tricolour.ca>
 <CAHC9VhQgDGPutYxQawMPmezm1a+i1nXO5KSn9_7KPDZsRBJ4pw@mail.gmail.com>
From:   John Johansen <john.johansen@canonical.com>
Autocrypt: addr=john.johansen@canonical.com; prefer-encrypt=mutual; keydata=
 LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tCgptUUlOQkU1bXJQb0JFQURB
 azE5UHNnVmdCS2tJbW1SMmlzUFE2bzdLSmhUVEtqSmR3VmJrV1NuTm4rbzZVcDVrCm5LUDFm
 NDlFQlFsY2VXZzF5cC9Od2JSOGFkK2VTRU8vdW1hL0srUHFXdkJwdEtDOVNXRDk3Rkc0dUI0
 L2Nhb20KTEVVOTdzTFFNdG52R1dkeHJ4VlJHTTRhbnpXWU1neno1VFptSWlWVFo0M091NVZw
 YVMxVnoxWlN4UDNoL3hLTgpaci9UY1c1V1FhaTh1M1BXVm5ia2poU1pQSHYxQmdoTjY5cXhF
 UG9tckpCbTFnbXR4M1ppVm1GWGx1d1RtVGdKCk9rcEZvbDduYkowaWxuWUhyQTdTWDNDdFIx
 dXBlVXBNYS9XSWFuVk85NldkVGpISElhNDNmYmhtUXViZTR0eFMKM0ZjUUxPSlZxUXN4NmxF
 OUI3cUFwcG05aFExMHFQV3dkZlB5LyswVzZBV3ROdTVBU2lHVkNJbld6bDJIQnFZZAovWmxs
 OTN6VXErTklvQ244c0RBTTlpSCt3dGFHRGNKeXdJR0luK2VkS050SzcyQU1nQ2hUZy9qMVpv
 V0g2WmVXClBqdVVmdWJWelp0bzFGTW9HSi9TRjRNbWRRRzFpUU50ZjRzRlpiRWdYdXk5Y0dp
 MmJvbUYwenZ5QkpTQU5weGwKS05CRFlLek42S3owOUhVQWtqbEZNTmdvbUwvY2pxZ0FCdEF4
 NTlMK2RWSVpmYUYyODFwSWNVWnp3dmg1K0pvRwplT1c1dUJTTWJFN0wzOG5zem9veWtJSjVY
 ckFjaGtKeE5mejdrK0ZuUWVLRWtOekVkMkxXYzNRRjRCUVpZUlQ2ClBISGdhM1JneWtXNSsx
 d1RNcUpJTGRtdGFQYlhyRjNGdm5WMExSUGN2NHhLeDdCM2ZHbTd5Z2Rvb3dBUkFRQUIKdEIx
 S2IyaHVJRXB2YUdGdWMyVnVJRHhxYjJodVFHcHFiWGd1Ym1WMFBva0NPZ1FUQVFvQUpBSWJB
 d1VMQ1FnSApBd1VWQ2drSUN3VVdBZ01CQUFJZUFRSVhnQVVDVG8wWVZ3SVpBUUFLQ1JBRkx6
 WndHTlhEMkx4SkQvOVRKWkNwCndsbmNUZ1llcmFFTWVEZmtXdjhjMUlzTTFqMEFtRTRWdEwr
 ZkU3ODBaVlA5Z2tqZ2tkWVN4dDdlY0VUUFRLTWEKWlNpc3JsMVJ3cVUwb29nWGRYUVNweHJH
 SDAxaWN1LzJuMGpjWVNxWUtnZ1B4eTc4QkdzMkxacTRYUGZKVFptSApaR25YR3EvZURyL21T
 bmowYWF2QkptTVo2amJpUHo2eUh0QllQWjlmZG84YnRjendQNDFZZVdvSXUyNi84SUk2CmYw
 WG0zVkM1b0FhOHY3UmQrUldaYThUTXdsaHpIRXh4ZWwzanRJN0l6ek9zbm1FOS84RG0wQVJE
 NWlUTENYd1IKMWN3SS9KOUJGL1MxWHY4UE4xaHVUM0l0Q05kYXRncDh6cW9Ka2dQVmptdnlM
 NjRRM2ZFa1liZkhPV3NhYmE5LwprQVZ0Qk56OVJURmg3SUhEZkVDVmFUb3VqQmQ3QnRQcXIr
 cUlqV0ZhZEpEM0k1ZUxDVkp2VnJyb2xyQ0FUbEZ0Ck4zWWtRczZKbjFBaUlWSVUzYkhSOEdq
 ZXZnejVMbDZTQ0dIZ1Jya3lScG5TWWFVL3VMZ24zN042QVl4aS9RQUwKK2J5M0N5RUZManpX
 QUV2eVE4YnEzSXVjbjdKRWJoUy9KLy9kVXFMb2VVZjh0c0dpMDB6bXJJVFpZZUZZQVJoUQpN
 dHNmaXpJclZEdHoxaVBmL1pNcDVnUkJuaXlqcFhuMTMxY20zTTNndjZIclFzQUdubjhBSnJ1
 OEdEaTVYSllJCmNvLzEreC9xRWlOMm5DbGFBT3BiaHpOMmVVdlBEWTVXMHEzYkEvWnAybWZH
 NTJ2YlJJK3RRMEJyMUhkL3ZzbnQKVUhPOTAzbU1aZXAyTnpOM0JaNXFFdlB2RzRyVzVacTJE
 cHliV2JRclNtOW9iaUJLYjJoaGJuTmxiaUE4YW05bwpiaTVxYjJoaGJuTmxia0JqWVc1dmJt
 bGpZV3d1WTI5dFBva0NOd1FUQVFvQUlRVUNUbzBYV2dJYkF3VUxDUWdICkF3VVZDZ2tJQ3dV
 V0FnTUJBQUllQVFJWGdBQUtDUkFGTHpad0dOWEQySXRNRC85anliYzg3ZE00dUFIazZ5Tk0K
 TjBZL0JGbW10VFdWc09CaHFPbm9iNGkzOEJyRE8yQzFoUUNQQ1FlNExMczEvNHB0ZW92UXQ4
 QjJGeXJQVmp3Zwo3alpUSE5LNzRyNmxDQ1Z4eDN5dTFCN1U5UG80VlRrY3NsVmIxL3FtV3V4
 OFhXY040eXZrVHFsTCtHeHB5Sm45CjlaWmZmWEpjNk9oNlRtT2ZiS0d2TXV1djVhclNJQTNK
 SEZMZjlhTHZadEExaXNKVXI3cFM5YXBnOXVUVUdVcDcKd2ZWMFdUNlQzZUczbXRVVTJ1cDVK
 VjQ4NTBMMDVqSFM2dVdpZS9ZK3lmSk9iaXlyeE4vNlpxVzVHb25oTEJxLwptc3pjVjV2QlQz
 QkRWZTNSdkY2WGRNOU9oUG4xK1k4MXg1NCt2UTExM044aUx3RjdHR2ExNFp5SVZBTlpEMEkw
 CkhqUnZhMmsvUnFJUlR6S3l1UEg1cGtsY0tIVlBFRk1tT3pNVCtGT294Tmp2Uys3K3dHMktN
 RFlFbUhQcjFQSkIKWlNaZUh6SzE5dGZhbFBNcHBGeGkrc3lZTGFnTjBtQjdKSFF3WTdjclV1
 T0RoeWNxNjBZVnoxdGFFeWd1M1l2MgoyL0kxRUNHSHZLSEc2d2M5MG80M0MvZWxIRUNYbkVo
 N3RLcGxEY3BJQytPQ21NeEtIaFI0NitYY1p2Z3c0RGdiCjdjYTgzZVFSM0NHODlMdlFwVzJM
 TEtFRUJEajdoWmhrTGJra1BSWm0zdzhKWTQ0YXc4VnRneFdkblNFTUNMeEwKSU9OaDZ1Wjcv
 L0RZVnRjSWFNSllrZWJhWnRHZENwMElnVVpiMjQvVmR2WkNZYk82MkhrLzNWbzFuWHdIVUVz
 Mwo2RC92MWJUMFJaRmk2OUxnc0NjT2N4NGdZTGtDRFFST1pxejZBUkFBb3F3NmtrQmhXeU0x
 ZnZnYW1BVmplWjZuCktFZm5SV2JrQzk0TDFFc0pMdXAzV2IyWDBBQk5PSFNrYlNENHBBdUMy
 dEtGL0VHQnQ1Q1A3UWRWS1JHY1F6QWQKNmIyYzFJZHk5Ukx3Nnc0Z2krbm4vZDFQbTFra1lo
 a1NpNXpXYUlnMG01UlFVaytFbDh6a2Y1dGNFLzFOMFo1TwpLMkpoandGdTViWDBhMGw0Y0ZH
 V1ZRRWNpVk1ES1J0eE1qRXRrM1N4RmFsbTZaZFEycHAyODIyY2xucTR6WjltCld1MWQyd2F4
 aXorYjVJYTR3ZURZYTduNDFVUmNCRVViSkFnbmljSmtKdENUd3lJeElXMktuVnlPcmp2a1F6
 SUIKdmFQMEZkUDJ2dlpvUE1kbENJek9sSWtQTGd4RTBJV3VlVFhlQkpoTnMwMXBiOGJMcW1U
 SU1sdTRMdkJFTEEvdgplaWFqajVzOHk1NDJIL2FIc2ZCZjRNUVVoSHhPL0JaVjdoMDZLU1Vm
 SWFZN09nQWdLdUdOQjNVaWFJVVM1K2E5CmduRU9RTER4S1J5L2E3UTF2OVMrTnZ4KzdqOGlI
 M2prUUpoeFQ2WkJoWkdSeDBna0gzVCtGMG5ORG01TmFKVXMKYXN3Z0pycUZaa1VHZDJNcm0x
 cW5Ld1hpQXQ4U0ljRU5kcTMzUjBLS0tSQzgwWGd3ajhKbjMwdlhMU0crTk8xRwpIMFVNY0F4
 TXd5L3B2azZMVTVKR2paUjczSjVVTFZoSDRNTGJEZ2dEM21QYWlHOCtmb3RUckpVUHFxaGc5
 aHlVCkVQcFlHN3NxdDc0WG43OStDRVpjakxIenlsNnZBRkUyVzBreGxMdFF0VVpVSE8zNmFm
 RnY4cUdwTzNacVB2akIKVXVhdFhGNnR2VVFDd2YzSDZYTUFFUUVBQVlrQ0h3UVlBUW9BQ1FV
 Q1RtYXMrZ0liREFBS0NSQUZMelp3R05YRAoyRC9YRC8wZGRNLzRhaTFiK1RsMWp6bkthalgz
 a0crTWVFWWVJNGY0MHZjbzNyT0xyblJHRk9jYnl5ZlZGNjlNCktlcGllNE93b0kxamNUVTBB
 RGVjbmJXbkROSHByMFNjenhCTXJvM2Juckxoc212anVuVFlJdnNzQlp0QjRhVkoKanVMSUxQ
 VWxuaEZxYTdmYlZxMFpRamJpVi9ydDJqQkVOZG05cGJKWjZHam5wWUljQWJQQ0NhL2ZmTDQv
 U1FSUwpZSFhvaEdpaVM0eTVqQlRtSzVsdGZld0xPdzAyZmtleEgrSUpGcnJHQlhEU2c2bjJT
 Z3hubisrTkYzNGZYY205CnBpYXczbUtzSUNtKzBoZE5oNGFmR1o2SVdWOFBHMnRlb29WRHA0
 ZFlpaCsreFgvWFM4ekJDYzFPOXc0bnpsUDIKZ0t6bHFTV2JoaVdwaWZSSkJGYTRXdEFlSlRk
 WFlkMzdqL0JJNFJXV2hueXc3YUFQTkdqMzN5dEdITlVmNlJvMgovanRqNHRGMXkvUUZYcWpK
 Ry93R2pwZHRSZmJ0VWpxTEhJc3ZmUE5OSnEvOTU4cDc0bmRBQ2lkbFdTSHpqK09wCjI2S3Bi
 Rm5td05PMHBzaVVzbmh2SEZ3UE8vdkFibDNSc1I1KzBSbytodnMyY0VtUXV2OXIvYkRsQ2Zw
 enAydDMKY0srcmh4VXFpc094OERaZnoxQm5rYW9DUkZidnZ2ays3TC9mb21QbnRHUGtxSmNp
 WUU4VEdIa1p3MWhPa3UrNApPb00yR0I1bkVEbGorMlRGL2pMUStFaXBYOVBrUEpZdnhmUmxD
 NmRLOFBLS2ZYOUtkZm1BSWNnSGZuVjFqU24rCjh5SDJkakJQdEtpcVcwSjY5YUlzeXg3aVYv
 MDNwYVBDakpoN1hxOXZBenlkTjVVL1VBPT0KPTZQL2IKLS0tLS1FTkQgUEdQIFBVQkxJQyBL
 RVkgQkxPQ0stLS0tLQo=
Organization: Canonical
Message-ID: <e6eb37d5-ec6b-852a-74df-bbf453607fbe@canonical.com>
Date:   Tue, 21 Jul 2020 12:30:57 -0700
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
 Thunderbird/68.8.0
MIME-Version: 1.0
In-Reply-To: <CAHC9VhQgDGPutYxQawMPmezm1a+i1nXO5KSn9_7KPDZsRBJ4pw@mail.gmail.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 7/21/20 8:19 AM, Paul Moore wrote:
> On Tue, Jul 14, 2020 at 5:00 PM Richard Guy Briggs <rgb@redhat.com> wrote:
>> On 2020-07-14 16:29, Paul Moore wrote:
>>> On Tue, Jul 14, 2020 at 1:44 PM Richard Guy Briggs <rgb@redhat.com> wrote:
>>>> On 2020-07-14 12:21, Paul Moore wrote:
>>>>> On Mon, Jul 13, 2020 at 3:52 PM Richard Guy Briggs <rgb@redhat.com> wrote:
>>>>>>
>>>>>> audit_log_string() was inteded to be an internal audit function and
>>>>>> since there are only two internal uses, remove them.  Purge all external
>>>>>> uses of it by restructuring code to use an existing audit_log_format()
>>>>>> or using audit_log_format().
>>>>>>
>>>>>> Please see the upstream issue
>>>>>> https://github.com/linux-audit/audit-kernel/issues/84
>>>>>>
>>>>>> Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
>>>>>> ---
>>>>>> Passes audit-testsuite.
>>>>>>
>>>>>> Changelog:
>>>>>> v4
>>>>>> - use double quotes in all replaced audit_log_string() calls
>>>>>>
>>>>>> v3
>>>>>> - fix two warning: non-void function does not return a value in all control paths
>>>>>>         Reported-by: kernel test robot <lkp@intel.com>
>>>>>>
>>>>>> v2
>>>>>> - restructure to piggyback on existing audit_log_format() calls, checking quoting needs for each.
>>>>>>
>>>>>> v1 Vlad Dronov
>>>>>> - https://github.com/nefigtut/audit-kernel/commit/dbbcba46335a002f44b05874153a85b9cc18aebf
>>>>>>
>>>>>>  include/linux/audit.h     |  5 -----
>>>>>>  kernel/audit.c            |  4 ++--
>>>>>>  security/apparmor/audit.c | 10 ++++------
>>>>>>  security/apparmor/file.c  | 25 +++++++------------------
>>>>>>  security/apparmor/ipc.c   | 46 +++++++++++++++++++++++-----------------------
>>>>>>  security/apparmor/net.c   | 14 ++++++++------
>>>>>>  security/lsm_audit.c      |  4 ++--
>>>>>>  7 files changed, 46 insertions(+), 62 deletions(-)
>>>>>
>>>>> Thanks for restoring the quotes, just one question below ...
>>>>>
>>>>>> diff --git a/security/apparmor/ipc.c b/security/apparmor/ipc.c
>>>>>> index 4ecedffbdd33..fe36d112aad9 100644
>>>>>> --- a/security/apparmor/ipc.c
>>>>>> +++ b/security/apparmor/ipc.c
>>>>>> @@ -20,25 +20,23 @@
>>>>>>
>>>>>>  /**
>>>>>>   * audit_ptrace_mask - convert mask to permission string
>>>>>> - * @buffer: buffer to write string to (NOT NULL)
>>>>>>   * @mask: permission mask to convert
>>>>>> + *
>>>>>> + * Returns: pointer to static string
>>>>>>   */
>>>>>> -static void audit_ptrace_mask(struct audit_buffer *ab, u32 mask)
>>>>>> +static const char *audit_ptrace_mask(u32 mask)
>>>>>>  {
>>>>>>         switch (mask) {
>>>>>>         case MAY_READ:
>>>>>> -               audit_log_string(ab, "read");
>>>>>> -               break;
>>>>>> +               return "read";
>>>>>>         case MAY_WRITE:
>>>>>> -               audit_log_string(ab, "trace");
>>>>>> -               break;
>>>>>> +               return "trace";
>>>>>>         case AA_MAY_BE_READ:
>>>>>> -               audit_log_string(ab, "readby");
>>>>>> -               break;
>>>>>> +               return "readby";
>>>>>>         case AA_MAY_BE_TRACED:
>>>>>> -               audit_log_string(ab, "tracedby");
>>>>>> -               break;
>>>>>> +               return "tracedby";
>>>>>>         }
>>>>>> +       return "";
>>>>>
>>>>> Are we okay with this returning an empty string ("") in this case?
>>>>> Should it be a question mark ("?")?
>>>>>
>>>>> My guess is that userspace parsing should be okay since it still has
>>>>> quotes, I'm just not sure if we wanted to use a question mark as we do
>>>>> in other cases where the field value is empty/unknown.
>>>>
>>>> Previously, it would have been an empty value, not even double quotes.
>>>> "?" might be an improvement.
>>>
>>> Did you want to fix that now in this patch, or leave it to later?  As
>>> I said above, I'm not too bothered by it with the quotes so either way
>>> is fine by me.
>>
>> I'd defer to Steve, otherwise I'd say leave it, since there wasn't
>> anything there before and this makes that more evident.
>>
>>> John, I'm assuming you are okay with this patch?
> 
> With no comments from John or Steve in the past week, I've gone ahead
> and merged the patch into audit/next.
> 


sorry, for some reason I thought a new iteration of this was coming.

the patch is fine, the empty unknown value should be possible here
so changing it to "?" won't affect anything.