| Message ID | 20250311224412.it.153-kees@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] net: macb: Add __nonstring annotations for unterminated strings | expand |
On Tue, Mar 11, 2025 at 3:44 PM Kees Cook <kees@kernel.org> wrote: > > When a character array without a terminating NUL character has a static > initializer, GCC 15's -Wunterminated-string-initialization will only > warn if the array lacks the "nonstring" attribute[1]. Mark the arrays > with __nonstring to and correctly identify the char array as "not a C s/__nonstring to and correctly/__nonstring to correctly/ ? > string" and thereby eliminate the warning. > > Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117178 [1] > Signed-off-by: Kees Cook <kees@kernel.org> > --- > v1: https://lore.kernel.org/lkml/20250310222415.work.815-kees@kernel.org/ > v2: switch to __nonstring annotation > Cc: Nicolas Ferre <nicolas.ferre@microchip.com> > Cc: Claudiu Beznea <claudiu.beznea@tuxon.dev> > Cc: Andrew Lunn <andrew+netdev@lunn.ch> > Cc: "David S. Miller" <davem@davemloft.net> > Cc: Eric Dumazet <edumazet@google.com> > Cc: Jakub Kicinski <kuba@kernel.org> > Cc: Paolo Abeni <pabeni@redhat.com> > Cc: netdev@vger.kernel.org > --- > drivers/net/ethernet/cadence/macb.h | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h > index 2847278d9cd4..003483073223 100644 > --- a/drivers/net/ethernet/cadence/macb.h > +++ b/drivers/net/ethernet/cadence/macb.h > @@ -1027,7 +1027,7 @@ struct gem_stats { > * this register should contribute to. > */ > struct gem_statistic { > - char stat_string[ETH_GSTRING_LEN]; > + char stat_string[ETH_GSTRING_LEN] __nonstring; > int offset; > u32 stat_bits; > }; > @@ -1068,6 +1068,7 @@ static const struct gem_statistic gem_statistics[] = { > GEM_STAT_TITLE(TX512CNT, "tx_512_1023_byte_frames"), > GEM_STAT_TITLE(TX1024CNT, "tx_1024_1518_byte_frames"), > GEM_STAT_TITLE(TX1519CNT, "tx_greater_than_1518_byte_frames"), > + Is this an errant inclusion? :-) Reviewed-by: Bill Wendling <morbo@google.com> > GEM_STAT_TITLE_BITS(TXURUNCNT, "tx_underrun", > GEM_BIT(NDS_TXERR)|GEM_BIT(NDS_TXFIFOERR)), > GEM_STAT_TITLE_BITS(SNGLCOLLCNT, "tx_single_collision_frames", > -- > 2.34.1 > >
diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h index 2847278d9cd4..003483073223 100644 --- a/drivers/net/ethernet/cadence/macb.h +++ b/drivers/net/ethernet/cadence/macb.h @@ -1027,7 +1027,7 @@ struct gem_stats { * this register should contribute to. */ struct gem_statistic { - char stat_string[ETH_GSTRING_LEN]; + char stat_string[ETH_GSTRING_LEN] __nonstring; int offset; u32 stat_bits; }; @@ -1068,6 +1068,7 @@ static const struct gem_statistic gem_statistics[] = { GEM_STAT_TITLE(TX512CNT, "tx_512_1023_byte_frames"), GEM_STAT_TITLE(TX1024CNT, "tx_1024_1518_byte_frames"), GEM_STAT_TITLE(TX1519CNT, "tx_greater_than_1518_byte_frames"), + GEM_STAT_TITLE_BITS(TXURUNCNT, "tx_underrun", GEM_BIT(NDS_TXERR)|GEM_BIT(NDS_TXFIFOERR)), GEM_STAT_TITLE_BITS(SNGLCOLLCNT, "tx_single_collision_frames",
When a character array without a terminating NUL character has a static initializer, GCC 15's -Wunterminated-string-initialization will only warn if the array lacks the "nonstring" attribute[1]. Mark the arrays with __nonstring to and correctly identify the char array as "not a C string" and thereby eliminate the warning. Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117178 [1] Signed-off-by: Kees Cook <kees@kernel.org> --- v1: https://lore.kernel.org/lkml/20250310222415.work.815-kees@kernel.org/ v2: switch to __nonstring annotation Cc: Nicolas Ferre <nicolas.ferre@microchip.com> Cc: Claudiu Beznea <claudiu.beznea@tuxon.dev> Cc: Andrew Lunn <andrew+netdev@lunn.ch> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <edumazet@google.com> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Paolo Abeni <pabeni@redhat.com> Cc: netdev@vger.kernel.org --- drivers/net/ethernet/cadence/macb.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)