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Re: [PATCH] misra: add deviation for MISRA C Rule R11.1.
- To: Stefano Stabellini <sstabellini@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 12 Dec 2024 11:35:01 +0100
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- Cc: Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>, consulting@xxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 12 Dec 2024 10:35:07 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.12.2024 03:29, Stefano Stabellini wrote:
> On Wed, 11 Dec 2024, Jan Beulich wrote:
>> On 11.12.2024 12:05, Alessandro Zucchelli wrote:
>>> Rule 11.1 states as following: "Conversions shall not be performed
>>> between a pointer to a function and any other type".
>>>
>>> In "xen/common/bug.c", in order to get additional debug information,
>>> pointer "bug_fn_t *fn" in the data section is converted to a function
>>> pointer, which is then used to get such information.
>>
>> If the pointer converted pointed into the data section, it would fault
>> upon being used to call what it points to, for the lack of execute
>> permissions there.
>>
>> The change itself looks okay to me, but the description imo needs
>> updating, to be as precise as possible.
>
>
> What about:
>
> In "xen/common/bug.c", in order to get additional debug information,
> pointer "bug_fn_t *fn" is converted to a function pointer, which is then
> used to get such information.
>
> ?
This may do; I, however, was rather hoping for the description to be
extended rather than shrunk. E.g. '..., pointer "bug_fn_t *fn", obtained
by arithmetic on a pointer originating in the data section, is converted
to a function pointer, ...'
Jan
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