include/linux/netlink.h:116:6: warning: ') out of range, only support mangle action on ipv6.hop_limit' directive output truncated writing 60 bytes into a region of size between 46 and 55

From: kernel test robot
Date: Fri Oct 20 2023 - 09:26:18 EST

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Hi Pieter,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: ce55c22ec8b223a90ff3e084d842f73cfba35588
commit: 9dbc8d2b9a02f938d32741297d56cc364dc0dce6 sfc: add decrement ipv6 hop limit by offloading set hop limit actions
date: 8 weeks ago
config: x86_64-randconfig-016-20231007 (https://download.01.org/0day-ci/archive/20231020/202310202136.4u7bv0hp-lkp@xxxxxxxxx/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231020/202310202136.4u7bv0hp-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/202310202136.4u7bv0hp-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

In file included from include/uapi/linux/neighbour.h:6:0,
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.isra.17':
include/linux/netlink.h:116:6: warning: 'sfc: Unsupported: only support mangle ipv4.ttl when we have an exact match on ttl, mask used for match (' directive output truncated writing 104 bytes into a region of size 80 [-Wformat-truncation=]
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:1157:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
NL_SET_ERR_MSG_FMT_MOD(extack,
^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:116:6: note: directive argument in the range [0, 254]
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:1157:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
NL_SET_ERR_MSG_FMT_MOD(extack,
^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:116:6: note: 'snprintf' output between 107 and 110 bytes into a destination of size 80
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:1157:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
NL_SET_ERR_MSG_FMT_MOD(extack,
^~~~~~~~~~~~~~~~~~~~~~
>> include/linux/netlink.h:116:6: warning: ') out of range, only support mangle action on ipv6.hop_limit' directive output truncated writing 60 bytes into a region of size between 46 and 55 [-Wformat-truncation=]
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:1205:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
NL_SET_ERR_MSG_FMT_MOD(extack,
^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:116:6: note: 'snprintf' output between 86 and 95 bytes into a destination of size 80
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:1205:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
NL_SET_ERR_MSG_FMT_MOD(extack,
^~~~~~~~~~~~~~~~~~~~~~
>> include/linux/netlink.h:116:6: warning: 'sfc: Unsupported: only support mangle ipv6.hop_limit when we have an exact match on ttl, mask used for match (' directive output truncated writing 110 bytes into a region of size 80 [-Wformat-truncation=]
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:1216:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
NL_SET_ERR_MSG_FMT_MOD(extack,
^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:116:6: note: directive argument in the range [0, 254]
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:1216:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
NL_SET_ERR_MSG_FMT_MOD(extack,
^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:116:6: note: 'snprintf' output between 113 and 116 bytes into a destination of size 80
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:1216:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
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:116:6: warning: ' conflicts with existing pseudo(MASK) entry for TOS mask ' directive output truncated writing 57 bytes into a region of size between 33 and 39 [-Wformat-truncation=]
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:627:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
NL_SET_ERR_MSG_FMT_MOD(extack,
^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:116:6: note: directive argument in the range [0, 2147483647]
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:627:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
NL_SET_ERR_MSG_FMT_MOD(extack,
^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:116:6: note: 'snprintf' output between 103 and 115 bytes into a destination of size 80
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:627:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
NL_SET_ERR_MSG_FMT_MOD(extack,
^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:116:6: warning: ' conflicts with existing pseudo(MASK) entry for mask ' directive output truncated writing 53 bytes into a region of size between 24 and 33 [-Wformat-truncation=]
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:634:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
NL_SET_ERR_MSG_FMT_MOD(extack,
^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:116:6: note: directive argument in the range [0, 2147483647]
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:634:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
NL_SET_ERR_MSG_FMT_MOD(extack,
^~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:116:6: note: 'snprintf' output between 102 and 120 bytes into a destination of size 80
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"%s" fmt "%s", "", ##args, "") >= \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netlink.h:131:2: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
^~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc.c:634:5: note: in expansion of macro 'NL_SET_ERR_MSG_FMT_MOD'
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@xxxxxxxxx>
:::::: CC: Jakub Kicinski <kuba@xxxxxxxxxx>

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

Next message: Arnd Bergmann: "[PATCH] bpf: hide cgroup functions for configs without cgroups"
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