IB/hfi1: Replace deprecated strncpy

`strncpy` is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.

We see that `buf` is expected to be NUL-terminated based on it's use
within a trace event wherein `is_misc_err_name` and `is_various_name`
map to `is_name` through `is_table`:
| TRACE_EVENT(hfi1_interrupt,
| 	    TP_PROTO(struct hfi1_devdata *dd, const struct is_table *is_entry,
| 		     int src),
| 	    TP_ARGS(dd, is_entry, src),
| 	    TP_STRUCT__entry(DD_DEV_ENTRY(dd)
| 			     __array(char, buf, 64)
| 			     __field(int, src)
| 			     ),
| 	    TP_fast_assign(DD_DEV_ASSIGN(dd);
| 			   is_entry->is_name(__entry->buf, 64,
| 					     src - is_entry->start);
| 			   __entry->src = src;
| 			   ),
| 	    TP_printk("[%s] source: %s [%d]", __get_str(dev), __entry->buf,
| 		      __entry->src)
| );

Considering the above, a suitable replacement is `strscpy_pad` due to
the fact that it guarantees NUL-termination on the destination buffer
while maintaining the NUL-padding behavior that strncpy provides.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
Link: https://lore.kernel.org/r/20230921-strncpy-drivers-infiniband-hw-hfi1-chip-c-v1-1-37afcf4964d9@google.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c
index de09b68075ab5c1ab4463028c91fa76e9af7793a..b3bbe4278786ff9b409962e0cd2585b88ced1586 100644 (file)
--- a/drivers/infiniband/hw/hfi1/chip.c
+++ b/drivers/infiniband/hw/hfi1/chip.c
@@ -5334,7 +5334,7 @@ static const char * const cce_misc_names[] = {
 static char *is_misc_err_name(char *buf, size_t bsize, unsigned int source)
 {
        if (source < ARRAY_SIZE(cce_misc_names))
-               strncpy(buf, cce_misc_names[source], bsize);
+               strscpy_pad(buf, cce_misc_names[source], bsize);
        else
                snprintf(buf, bsize, "Reserved%u",
                         source + IS_GENERAL_ERR_START);
@@ -5374,7 +5374,7 @@ static const char * const various_names[] = {
 static char *is_various_name(char *buf, size_t bsize, unsigned int source)
 {
        if (source < ARRAY_SIZE(various_names))
-               strncpy(buf, various_names[source], bsize);
+               strscpy_pad(buf, various_names[source], bsize);
        else
                snprintf(buf, bsize, "Reserved%u", source + IS_VARIOUS_START);
        return buf;