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* [linux-next:master 13014/13109] include/linux/netlink.h:116:13: warning: 'sfc: Unsupported: only suppo...' directive output truncated writing 104 bytes into a region of size 80
@ 2023-08-28 12:51 kernel test robot
  0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2023-08-28 12:51 UTC (permalink / raw)
  To: David S. Miller; +Cc: oe-kbuild-all, Linux Memory Management List, netdev

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   2ee82481c392eec06a7ef28df61b7f0d8e45be2e
commit: 01183204bc24d9612add84a809377cb10737e77f [13014/13109] Merge branch 'main' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20230828/202308282000.2XNh0K6D-lkp@intel.com/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/20230828/202308282000.2XNh0K6D-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308282000.2XNh0K6D-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/uapi/linux/neighbour.h:6,
                    from include/linux/netdevice.h:45,
                    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_mangle':
>> include/linux/netlink.h:116:13: warning: 'sfc: Unsupported: only suppo...' directive output truncated writing 104 bytes into a region of size 80 [-Wformat-truncation=]
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:1223:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
    1223 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:116:13: note: directive argument in the range [0, 254]
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:1223:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
    1223 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:116:13: note: 'snprintf' output between 107 and 110 bytes into a destination of size 80
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:1223:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
    1223 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:116:13: warning: 'sfc: Unsupported: only suppo...' directive output truncated writing 110 bytes into a region of size 80 [-Wformat-truncation=]
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:1282:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
    1282 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:116:13: note: directive argument in the range [0, 254]
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:1282:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
    1282 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:116:13: note: 'snprintf' output between 113 and 116 bytes into a destination of size 80
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:1282:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
    1282 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~
>> include/linux/netlink.h:116:13: warning: ') out of range, only support...' directive output truncated writing 60 bytes into a region of size between 46 and 55 [-Wformat-truncation=]
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:1271:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
    1271 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:116:13: note: 'snprintf' output between 86 and 95 bytes into a destination of size 80
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:1271:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
    1271 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c: In function 'efx_tc_flower_record_encap_match':
   include/linux/netlink.h:116:13: warning: ' conflicts with existing pse...' directive output truncated writing 53 bytes into a region of size between 28 and 33 [-Wformat-truncation=]
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:634:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
     634 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:116:13: note: directive argument in the range [0, 65535]
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:634:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
     634 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:116:13: note: 'snprintf' output between 102 and 112 bytes into a destination of size 80
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:634:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
     634 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:116:13: warning: ' conflicts with existing pse...' directive output truncated writing 57 bytes into a region of size 39 [-Wformat-truncation=]
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:627:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
     627 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:116:13: note: directive argument in the range [0, 255]
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:627:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
     627 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:116:13: note: 'snprintf' output 103 bytes into a destination of size 80
     116 |         if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,               \
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     117 |                      "%s" fmt "%s", "", ##args, "") >=                         \
         |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/netlink.h:131:9: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
     131 |         NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
         |         ^~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/sfc/tc.c:627:33: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
     627 |                                 NL_SET_ERR_MSG_FMT_MOD(extack,
         |                                 ^~~~~~~~~~~~~~~~~~~~~~


vim +116 include/linux/netlink.h

2d4bc93368f5a0d Johannes Berg 2017-04-12  107  
51c352bdbcd23d7 Edward Cree   2022-10-18  108  /* We splice fmt with %s at each end even in the snprintf so that both calls
51c352bdbcd23d7 Edward Cree   2022-10-18  109   * can use the same string constant, avoiding its duplication in .ro
51c352bdbcd23d7 Edward Cree   2022-10-18  110   */
51c352bdbcd23d7 Edward Cree   2022-10-18  111  #define NL_SET_ERR_MSG_FMT(extack, fmt, args...) do {			       \
51c352bdbcd23d7 Edward Cree   2022-10-18  112  	struct netlink_ext_ack *__extack = (extack);			       \
51c352bdbcd23d7 Edward Cree   2022-10-18  113  									       \
51c352bdbcd23d7 Edward Cree   2022-10-18  114  	if (!__extack)							       \
51c352bdbcd23d7 Edward Cree   2022-10-18  115  		break;							       \
51c352bdbcd23d7 Edward Cree   2022-10-18 @116  	if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,	       \
51c352bdbcd23d7 Edward Cree   2022-10-18  117  		     "%s" fmt "%s", "", ##args, "") >=			       \
51c352bdbcd23d7 Edward Cree   2022-10-18  118  	    NETLINK_MAX_FMTMSG_LEN)					       \
51c352bdbcd23d7 Edward Cree   2022-10-18  119  		net_warn_ratelimited("%s" fmt "%s", "truncated extack: ",      \
51c352bdbcd23d7 Edward Cree   2022-10-18  120  				     ##args, "\n");			       \
51c352bdbcd23d7 Edward Cree   2022-10-18  121  									       \
51c352bdbcd23d7 Edward Cree   2022-10-18  122  	do_trace_netlink_extack(__extack->_msg_buf);			       \
51c352bdbcd23d7 Edward Cree   2022-10-18  123  									       \
51c352bdbcd23d7 Edward Cree   2022-10-18  124  	__extack->_msg = __extack->_msg_buf;				       \
51c352bdbcd23d7 Edward Cree   2022-10-18  125  } while (0)
51c352bdbcd23d7 Edward Cree   2022-10-18  126  

:::::: The code at line 116 was first introduced by commit
:::::: 51c352bdbcd23d7ce46b06c1e64c82754dc44044 netlink: add support for formatted extack messages

:::::: TO: Edward Cree <ecree.xilinx@gmail.com>
:::::: CC: Jakub Kicinski <kuba@kernel.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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