From: kernel test robot <lkp@intel.com>
To: cros-kernel-buildreports@googlegroups.com
Cc: oe-kbuild-all@lists.linux.dev
Subject: [android-common:android15-6.6-2024-08 36/36] include/linux/netlink.h:116:13: warning: ' for stack (total ' directive output truncated writing 18 bytes into a region of size between 0 and 14
Date: Wed, 2 Jul 2025 17:17:55 +0800 [thread overview]
Message-ID: <202507021710.b0ZxeP2T-lkp@intel.com> (raw)
Hi Vladimir,
FYI, the error/warning still remains.
tree: https://android.googlesource.com/kernel/common android15-6.6-2024-08
head: e46d8eec80ca529b65ede6df00d9219e17665b1e
commit: 17e5530a74af3cd8a0f8af1d05651f271d61a58b [36/36] net: enetc: shorten enetc_setup_xdp_prog() error message to fit NETLINK_MAX_FMTMSG_LEN
config: arm-allmodconfig (https://download.01.org/0day-ci/archive/20250702/202507021710.b0ZxeP2T-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250702/202507021710.b0ZxeP2T-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/202507021710.b0ZxeP2T-lkp@intel.com/
All warnings (new ones prefixed by >>):
drivers/net/ethernet/freescale/enetc/enetc.c: In function 'enetc_setup_irqs':
drivers/net/ethernet/freescale/enetc/enetc.c:2306:60: warning: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size between 4 and 19 [-Wformat-truncation=]
2306 | snprintf(v->name, sizeof(v->name), "%s-rxtx%d",
| ^~
drivers/net/ethernet/freescale/enetc/enetc.c:2306:52: note: directive argument in the range [-2147483638, 2147483646]
2306 | snprintf(v->name, sizeof(v->name), "%s-rxtx%d",
| ^~~~~~~~~~~
drivers/net/ethernet/freescale/enetc/enetc.c:2306:17: note: 'snprintf' output between 7 and 32 bytes into a destination of size 24
2306 | snprintf(v->name, sizeof(v->name), "%s-rxtx%d",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2307 | priv->ndev->name, i);
| ~~~~~~~~~~~~~~~~~~~~
In file included from include/uapi/linux/neighbour.h:6,
from include/linux/netdevice.h:45,
from drivers/net/ethernet/freescale/enetc/enetc.h:6,
from drivers/net/ethernet/freescale/enetc/enetc.c:4:
In function 'enetc_setup_xdp_prog',
inlined from 'enetc_setup_bpf' at drivers/net/ethernet/freescale/enetc/enetc.c:2791:10:
>> include/linux/netlink.h:116:13: warning: ' for stack (total ' directive output truncated writing 18 bytes into a region of size between 0 and 14 [-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/freescale/enetc/enetc.c:2771:17: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
2771 | 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/freescale/enetc/enetc.c:2771:17: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
2771 | NL_SET_ERR_MSG_FMT_MOD(extack,
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:116:13: note: 'snprintf' output between 87 and 111 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/freescale/enetc/enetc.c:2771:17: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
2771 | NL_SET_ERR_MSG_FMT_MOD(extack,
| ^~~~~~~~~~~~~~~~~~~~~~
vim +116 include/linux/netlink.h
2d4bc93368f5a0 Johannes Berg 2017-04-12 107
51c352bdbcd23d Edward Cree 2022-10-18 108 /* We splice fmt with %s at each end even in the snprintf so that both calls
51c352bdbcd23d Edward Cree 2022-10-18 109 * can use the same string constant, avoiding its duplication in .ro
51c352bdbcd23d Edward Cree 2022-10-18 110 */
51c352bdbcd23d Edward Cree 2022-10-18 111 #define NL_SET_ERR_MSG_FMT(extack, fmt, args...) do { \
51c352bdbcd23d Edward Cree 2022-10-18 112 struct netlink_ext_ack *__extack = (extack); \
51c352bdbcd23d Edward Cree 2022-10-18 113 \
51c352bdbcd23d Edward Cree 2022-10-18 114 if (!__extack) \
51c352bdbcd23d Edward Cree 2022-10-18 115 break; \
51c352bdbcd23d Edward Cree 2022-10-18 @116 if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
51c352bdbcd23d Edward Cree 2022-10-18 117 "%s" fmt "%s", "", ##args, "") >= \
51c352bdbcd23d Edward Cree 2022-10-18 118 NETLINK_MAX_FMTMSG_LEN) \
51c352bdbcd23d Edward Cree 2022-10-18 119 net_warn_ratelimited("%s" fmt "%s", "truncated extack: ", \
51c352bdbcd23d Edward Cree 2022-10-18 120 ##args, "\n"); \
51c352bdbcd23d Edward Cree 2022-10-18 121 \
51c352bdbcd23d Edward Cree 2022-10-18 122 do_trace_netlink_extack(__extack->_msg_buf); \
51c352bdbcd23d Edward Cree 2022-10-18 123 \
51c352bdbcd23d Edward Cree 2022-10-18 124 __extack->_msg = __extack->_msg_buf; \
51c352bdbcd23d Edward Cree 2022-10-18 125 } while (0)
51c352bdbcd23d 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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