include/linux/netlink.h:115:13: warning: ' conflicts with existing pse...' directive output truncated writing 53 bytes into a region of size between 28 and 33

From: kernel test robot
Date: Thu Oct 19 2023 - 04:01:08 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: dd72f9c7e512da377074d47d990564959b772643
commit: b6583d5e9e94adce1be61ec59fef4e129f0bc68a sfc: support TC decap rules matching on enc_src_port
date: 5 months ago
config: x86_64-randconfig-x013-20230730 (https://download.01.org/0day-ci/archive/20231019/202310191526.qzRRtPnw-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231019/202310191526.qzRRtPnw-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310191526.qzRRtPnw-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

In file included from include/uapi/linux/neighbour.h:6,
from include/linux/netdevice.h:46,
from include/net/sch_generic.h:5,
from include/net/pkt_cls.h:7,
from drivers/net/ethernet/sfc/tc.c:12:
drivers/net/ethernet/sfc/tc.c: In function 'efx_tc_flower_record_encap_match':
>> include/linux/netlink.h:115:13: warning: ' conflicts with existing pse...' directive output truncated writing 53 bytes into a region of size between 28 and 33 [-Wformat-truncation=]
115 | if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
116 | "%s" fmt "%s", "", ##args, "") >= \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:130:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
130 | NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
| ^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:518:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
518 | NL_SET_ERR_MSG_FMT_MOD(extack,
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:115:13: note: directive argument in the range [0, 65535]
115 | if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
116 | "%s" fmt "%s", "", ##args, "") >= \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:130:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
130 | NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
| ^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:518:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
518 | NL_SET_ERR_MSG_FMT_MOD(extack,
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:115:13: note: 'snprintf' output between 102 and 112 bytes into a destination of size 80
115 | if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
116 | "%s" fmt "%s", "", ##args, "") >= \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:130:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
130 | NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
| ^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:518:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
518 | NL_SET_ERR_MSG_FMT_MOD(extack,
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:115:13: warning: ' conflicts with existing pse...' directive output truncated writing 57 bytes into a region of size 39 [-Wformat-truncation=]
115 | if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
116 | "%s" fmt "%s", "", ##args, "") >= \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:130:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
130 | NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
| ^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:511:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
511 | NL_SET_ERR_MSG_FMT_MOD(extack,
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:115:13: note: directive argument in the range [0, 255]
115 | if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
116 | "%s" fmt "%s", "", ##args, "") >= \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:130:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
130 | NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
| ^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:511:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
511 | NL_SET_ERR_MSG_FMT_MOD(extack,
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:115:13: note: 'snprintf' output 103 bytes into a destination of size 80
115 | if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
116 | "%s" fmt "%s", "", ##args, "") >= \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:130:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
130 | NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
| ^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:511:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
511 | NL_SET_ERR_MSG_FMT_MOD(extack,
| ^~~~~~~~~~~~~~~~~~~~~~

vim +115 include/linux/netlink.h

2d4bc93368f5a0 Johannes Berg 2017-04-12 106
51c352bdbcd23d Edward Cree 2022-10-18 107 /* We splice fmt with %s at each end even in the snprintf so that both calls
51c352bdbcd23d Edward Cree 2022-10-18 108 * can use the same string constant, avoiding its duplication in .ro
51c352bdbcd23d Edward Cree 2022-10-18 109 */
51c352bdbcd23d Edward Cree 2022-10-18 110 #define NL_SET_ERR_MSG_FMT(extack, fmt, args...) do { \
51c352bdbcd23d Edward Cree 2022-10-18 111 struct netlink_ext_ack *__extack = (extack); \
51c352bdbcd23d Edward Cree 2022-10-18 112 \
51c352bdbcd23d Edward Cree 2022-10-18 113 if (!__extack) \
51c352bdbcd23d Edward Cree 2022-10-18 114 break; \
51c352bdbcd23d Edward Cree 2022-10-18 @115 if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
51c352bdbcd23d Edward Cree 2022-10-18 116 "%s" fmt "%s", "", ##args, "") >= \
51c352bdbcd23d Edward Cree 2022-10-18 117 NETLINK_MAX_FMTMSG_LEN) \
51c352bdbcd23d Edward Cree 2022-10-18 118 net_warn_ratelimited("%s" fmt "%s", "truncated extack: ", \
51c352bdbcd23d Edward Cree 2022-10-18 119 ##args, "\n"); \
51c352bdbcd23d Edward Cree 2022-10-18 120 \
51c352bdbcd23d Edward Cree 2022-10-18 121 do_trace_netlink_extack(__extack->_msg_buf); \
51c352bdbcd23d Edward Cree 2022-10-18 122 \
51c352bdbcd23d Edward Cree 2022-10-18 123 __extack->_msg = __extack->_msg_buf; \
51c352bdbcd23d Edward Cree 2022-10-18 124 } while (0)
51c352bdbcd23d Edward Cree 2022-10-18 125

:::::: The code at line 115 was first introduced by commit
:::::: 51c352bdbcd23d7ce46b06c1e64c82754dc44044 netlink: add support for formatted extack messages

:::::: TO: Edward Cree <ecree.xilinx@xxxxxxxxx>
:::::: CC: Jakub Kicinski <kuba@xxxxxxxxxx>

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Next message: Andrew Jones: "Re: [PATCH v2 4/8] RISC-V: KVM: Forward SBI DBCN extension to user-space"
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