nis: Fix stringop-truncation warning with -O3 in nis_local_host.

When building with -O3 on s390x/x86_64, I get this stringop-truncation warning
which leads to a build fail:

In function ‘nis_local_host’,
    inlined from ‘nis_local_host’ at nis_local_names.c:147:1:
nis_local_names.c:171:11: error: ‘strncpy’ output may be truncated copying between 0 and 1023 bytes from a string of length 1024 [-Werror=stringop-truncation]
171 |           strncpy (cp, nis_local_directory (), NIS_MAXNAMELEN - len -1);
       |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We can just ignore this warning as the hostname + '.' + directory-name + '\0' always fits
in __nishostname with length of (NIS_MAXNAMELEN + 1) as there is the runtime check above.
Furthermore as we already know the length of the directory-name, we can also just use
memcpy to copy the directory-name inclusive the NUL-termination.

Note: This werror was introduced with commit
32c7acd464
"Replace rawmemchr (s, '\0') with strchr"

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>
This commit is contained in:
Stefan Liebler 2023-02-28 13:37:35 +01:00
parent 3bfdc4e2bc
commit 1e0c8356f5

View File

@ -161,15 +161,19 @@ nis_local_host (void)
if (cp[-1] == '.')
return __nishostname;
if (len + strlen (nis_local_directory ()) + 1 > NIS_MAXNAMELEN)
nis_name local_directory = nis_local_directory ();
size_t local_directory_len = strlen (local_directory);
if (len + 1 + local_directory_len > NIS_MAXNAMELEN)
{
__nishostname[0] = '\0';
return __nishostname;
}
/* We have enough space in __nishostname with length of
(NIS_MAXNAMELEN + 1) for
hostname + '.' + directory-name + '\0'. */
*cp++ = '.';
strncpy (cp, nis_local_directory (), NIS_MAXNAMELEN - len -1);
__nishostname[NIS_MAXNAMELEN] = '\0';
memcpy (cp, local_directory, local_directory_len + 1);
}
}