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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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  • 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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