Linux Kernel Network Subsystem Patching

[Aruna Hewapathirane]

Thank's Ted will go through and see...


On Fri, Jan 10, 2014 at 9:03 PM, ted leslie <ted.leslie-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> wrote:

> Not familiar with Git patch, but I guess it is just "patch".
> follow this
>
> https://groups.google.com/forum/#!topic/msysgit/6NNvXeyd5xM
>
> -tl
>
>
> On Fri, Jan 10, 2014 at 8:42 PM, Aruna Hewapathirane <
> aruna.hewapathirane-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> wrote:
>
>> Ted believe me I have tried and tried and finally decided to ask for
>> help. The patch errors are below:
>>
>> aruna at aruna-desktop:/media/kernel-dev/next-net/net-next$ git
>> format-patch --subject-prefix="PATCH v1" HEAD^
>> 0001-Network-Subsystem-v2.patch
>>
>> aruna at aruna-desktop:/media/kernel-dev/next-net/net-next$ git apply
>> --check 0001-Network-Subsystem-v2.patch
>>
>> error: patch failed: net/core/neighbour.c:117
>>
>> error: net/core/neighbour.c: patch does not apply
>>
>> It makes no sense to me because all the other files compile clean nil
>> errors :(
>>
>> On Fri, Jan 10, 2014 at 8:36 PM, ted leslie <ted.leslie-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> wrote:
>>
>>> What patch error are you getting?
>>>
>>> You can see what the patch is doing, you can just go put the changed two
>>> lines in with editor.
>>> -tl
>>>
>>>
>>>
>>>
>>> On Fri, Jan 10, 2014 at 8:05 PM, Aruna Hewapathirane <
>>> aruna.hewapathirane-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> wrote:
>>>
>>>> Hello Everybody,
>>>>
>>>> I am a total newbie to kernel hacking and I have a question. Am trying
>>>> to patch the Network Subsystem and changing the net_random() to direct
>>>> calls of prandom_u32. Why ? Because it is
>>>> harder to audit / grep and new commits actually use prandom_u32 only
>>>> am told.
>>>>
>>>> u32 prandom_u32(void);    /* defined in include/linux/random.h: */
>>>>
>>>> #define net_random()        prandom_u32() /* defined in
>>>> include/linux/net.h */
>>>>
>>>> Everything works as expected until I get to net/core/neighbour.c and
>>>> then patch fails to apply.
>>>>
>>>> The diff is here:
>>>>
>>>>
>>>> -------------------------------------------------------------------------------------------------------------------------------
>>>> diff --git a/net/core/neighbour.c b/net/core/neighbour.c
>>>> index 47d834e..ea97361 100644
>>>> --- a/net/core/neighbour.c
>>>> +++ b/net/core/neighbour.c
>>>> @@ -117,7 +117,7 @@ static void neigh_cleanup_and_release(struct
>>>> neighbour *neig
>>>>
>>>>  unsigned long neigh_rand_reach_time(unsigned long base)
>>>>  {
>>>> -       return base ? (prandom_u32() % base) + (base >> 1) : 0;
>>>> +       return base ? (net_random() % base) + (base >> 1) : 0;
>>>>  }
>>>>  EXPORT_SYMBOL(neigh_rand_reach_time);
>>>>
>>>> @@ -1415,7 +1415,7 @@ void pneigh_enqueue(struct neigh_table *tbl,
>>>> struct neigh_
>>>>                     struct sk_buff *skb)
>>>>  {
>>>>         unsigned long now = jiffies;
>>>> -       unsigned long sched_next = now + (prandom_u32() %
>>>> +       unsigned long sched_next = now + (net_random() %
>>>>                                           NEIGH_VAR(p, PROXY_DELAY));
>>>>
>>>>         if (tbl->proxy_queue.qlen > NEIGH_VAR(p, PROXY_QLEN)) {
>>>>
>>>> -------------------------------------------------------------------------------------------------------------------------------
>>>>
>>>> I can use some help and guidance please, what am I doing wrong ? Or not
>>>> seeing ? It's just this neighbor.c file that is doing this and I am
>>>> stumped.
>>>>
>>>> Thank you.
>>>> Aruna
>>>>
>>>> <https://sites.google.com/site/arunahewapathirane/home/business-card/buisness-card.png?attredirects=0>
>>>>
>>>
>>>
>>
>>
>> --
>> *Aruna Hewapathirane*
>> Consultant/Trainer
>> Phone : 647-709-9269
>> Website: <http://goog_1768911931>Open Source Solutions<http://sahanaya.net/aruna/>
>>
>>
>>
>>
>> <https://sites.google.com/site/arunahewapathirane/home/business-card/buisness-card.png?attredirects=0>
>>
>
>


-- 
*Aruna Hewapathirane*
Consultant/Trainer
Phone : 647-709-9269
Website: <http://goog_1768911931>Open Source
Solutions<http://sahanaya.net/aruna/>



<https://sites.google.com/site/arunahewapathirane/home/business-card/buisness-card.png?attredirects=0>
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