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Re: [Xen-devel] [PATCH] tests/cpu-policy: fix format-overflow warning by null terminating strings
- To: Jan Beulich <JBeulich@xxxxxxxx>, "christopher.w.clark@xxxxxxxxx" <christopher.w.clark@xxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 26 Jul 2019 10:08:24 +0100
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 26 Jul 2019 09:08:36 +0000
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On 25/07/2019 11:03, Jan Beulich wrote:
> On 25.07.2019 02:53, christopher.w.clark@xxxxxxxxx wrote:
>> gcc 9.1.0 reports:
>>
>> | test-cpu-policy.c:64:18: error: '%.12s' directive argument is not a
>> nul-terminated string [-Werror=format-overflow=]
>> | 64 | fail(" Test '%.12s', expected vendor %u, got %u\n",
>> | | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> | test-cpu-policy.c:20:12: note: in definition of macro 'fail'
>> | 20 | printf(fmt, ##__VA_ARGS__); \
>> | | ^~~
>> | test-cpu-policy.c:64:27: note: format string is defined here
>> | 64 | fail(" Test '%.12s', expected vendor %u, got %u\n",
>> | | ^~~~~
>> | test-cpu-policy.c:44:7: note: referenced argument declared here
>> | 44 | } tests[] = {
>> | | ^~~~~
> I must be missing something here: %.12s says that no more than 12
> bytes are to be read from the string. There's nul terminator
> required. This is what the standard says
>
> "Characters from the array are written up to (but not including)
> the terminating null character. If the precision is specified, no
> more than that many bytes are written. If the precision is not
> specified or is greater than the size of the array, the array
> shall contain a null character."
>
> For the moment it looks to me as if the compiler was wrong to
> complain.
That is my assessment as well, but I haven't had time to file a GCC bug yet.
~Andrew
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