Re: [PATCH] firmware: raspberrypi: Fix firmware calls with large buffers

Re: [PATCH] firmware: raspberrypi: Fix firmware calls with large buffers

[Kees Cook]

On Thu, Nov 15, 2018 at 10:05 AM, Stefan Wahren <stefan.wahren@i2se.com> wrote:
> Hi James,
>
> please look at
> https://www.kernel.org/doc/html/v4.19/process/submitting-patches.html,
> because there are several issues with this patch. Most critical one is
> that i received it not as plain text. Please make sure that send your
> patch with git send-email.

The irony is I had to fight Gmail over your multipart HTML+plain
email. Yay email clients! ;)

> Am 15.11.18 um 14:18 schrieb James Hughes:
> > A previous change (5bfdc1097654) moved away from VLA's
>
> Please use the commit format mentioned in the link above.

And actually, this SHA isn't the upstream SHA. This should be:

a1547e0bca51 ("firmware: raspberrypi: Remove VLA usage")

> > to a fixed maximum size for mailbox data.
> > However, some mailbox calls use larger data buffers
> > than the maximum allowed in that change. This fix therefor

Which ones did this? In the initial change I couldn't find anything
that exceeded 32 bytes. (I'm just curious if I missed something or if
something new appeared.)

> > [...]
> > + /* Some mailboxes can use over 1k bytes. Rather than checking

Up to Eric, but I think the preferred comment style is:

/*
 * lines go here
 */

Otherwise, this seems fine to me. Thanks for getting it fixed!

-- 
Kees Cook

Re: [PATCH] firmware: raspberrypi: Fix firmware calls with large buffers

[Eric Anholt]

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Kees Cook <keescook@chromium.org> writes:

> On Thu, Nov 15, 2018 at 10:05 AM, Stefan Wahren <stefan.wahren@i2se.com> wrote:
>> Hi James,
>>
>> please look at
>> https://www.kernel.org/doc/html/v4.19/process/submitting-patches.html,
>> because there are several issues with this patch. Most critical one is
>> that i received it not as plain text. Please make sure that send your
>> patch with git send-email.
>
> The irony is I had to fight Gmail over your multipart HTML+plain
> email. Yay email clients! ;)
>
>> Am 15.11.18 um 14:18 schrieb James Hughes:
>> > A previous change (5bfdc1097654) moved away from VLA's
>>
>> Please use the commit format mentioned in the link above.
>
> And actually, this SHA isn't the upstream SHA. This should be:
>
> a1547e0bca51 ("firmware: raspberrypi: Remove VLA usage")
>
>> > to a fixed maximum size for mailbox data.
>> > However, some mailbox calls use larger data buffers
>> > than the maximum allowed in that change. This fix therefor
>
> Which ones did this? In the initial change I couldn't find anything
> that exceeded 32 bytes. (I'm just curious if I missed something or if
> something new appeared.)

Nothing in tree used larger, it's that there are firmware transactions
that are bigger.

>> > [...]
>> > + /* Some mailboxes can use over 1k bytes. Rather than checking
>
> Up to Eric, but I think the preferred comment style is:
>
> /*
>  * lines go here
>  */
>
> Otherwise, this seems fine to me. Thanks for getting it fixed!

I have no preference about comment style, I just want fixes to land. :)

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