tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 95c8a35f1c017327eab3b6a2ff5c04255737c856 commit: 2f78788b55baa3410b1ec91a576286abe1ad4d6a ilog2: improve ilog2 for constant arguments date: 3 years, 1 month ago config: arm-nhk8815_defconfig (https://download.01.org/0day-ci/archive/20240106/202401062301.BVsuAP57-lkp@xxxxxxxxx/config) compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240106/202401062301.BVsuAP57-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/202401062301.BVsuAP57-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): security/keys/proc.c: In function 'proc_keys_show': >> security/keys/proc.c:217:45: warning: 'sprintf' may write a terminating nul past the end of the destination [-Wformat-overflow=] 217 | sprintf(xbuf, "%lluw", div_u64(timo, 60 * 60 * 24 * 7)); | ^ security/keys/proc.c:217:25: note: 'sprintf' output between 3 and 17 bytes into a destination of size 16 217 | sprintf(xbuf, "%lluw", div_u64(timo, 60 * 60 * 24 * 7)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ security/keys/proc.c:215:45: warning: 'sprintf' may write a terminating nul past the end of the destination [-Wformat-overflow=] 215 | sprintf(xbuf, "%llud", div_u64(timo, 60 * 60 * 24)); | ^ security/keys/proc.c:215:25: note: 'sprintf' output between 3 and 17 bytes into a destination of size 16 215 | sprintf(xbuf, "%llud", div_u64(timo, 60 * 60 * 24)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> security/keys/proc.c:213:44: warning: 'h' directive writing 1 byte into a region of size between 0 and 15 [-Wformat-overflow=] 213 | sprintf(xbuf, "%lluh", div_u64(timo, 60 * 60)); | ^ security/keys/proc.c:213:25: note: 'sprintf' output between 3 and 18 bytes into a destination of size 16 213 | sprintf(xbuf, "%lluh", div_u64(timo, 60 * 60)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/sprintf +217 security/keys/proc.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 152 ^1da177e4c3f41 Linus Torvalds 2005-04-16 153 static int proc_keys_show(struct seq_file *m, void *v) ^1da177e4c3f41 Linus Torvalds 2005-04-16 154 { ^1da177e4c3f41 Linus Torvalds 2005-04-16 155 struct rb_node *_p = v; ^1da177e4c3f41 Linus Torvalds 2005-04-16 156 struct key *key = rb_entry(_p, struct key, serial_node); ab5c69f01313c8 Eric Biggers 2017-09-27 157 unsigned long flags; 927942aabbbe50 David Howells 2010-06-11 158 key_ref_t key_ref, skey_ref; 074d58989569b3 Baolin Wang 2017-11-15 159 time64_t now, expiry; 03dab869b7b239 David Howells 2016-10-26 160 char xbuf[16]; 363b02dab09b32 David Howells 2017-10-04 161 short state; 074d58989569b3 Baolin Wang 2017-11-15 162 u64 timo; 06ec7be557a125 Michael LeMay 2006-06-26 163 int rc; 06ec7be557a125 Michael LeMay 2006-06-26 164 4bdf0bc3003141 David Howells 2013-09-24 165 struct keyring_search_context ctx = { ede0fa98a900e6 Eric Biggers 2019-02-22 166 .index_key = key->index_key, 4aa68e07d84556 Eric Biggers 2017-09-18 167 .cred = m->file->f_cred, 462919591a1791 David Howells 2014-09-16 168 .match_data.cmp = lookup_user_key_possessed, 462919591a1791 David Howells 2014-09-16 169 .match_data.raw_data = key, 462919591a1791 David Howells 2014-09-16 170 .match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT, dcf49dbc8077e2 David Howells 2019-06-26 171 .flags = (KEYRING_SEARCH_NO_STATE_CHECK | dcf49dbc8077e2 David Howells 2019-06-26 172 KEYRING_SEARCH_RECURSE), 4bdf0bc3003141 David Howells 2013-09-24 173 }; 4bdf0bc3003141 David Howells 2013-09-24 174 028db3e290f15a Linus Torvalds 2019-07-10 175 key_ref = make_key_ref(key, 0); 927942aabbbe50 David Howells 2010-06-11 176 927942aabbbe50 David Howells 2010-06-11 177 /* determine if the key is possessed by this process (a test we can 927942aabbbe50 David Howells 2010-06-11 178 * skip if the key does not indicate the possessor can view it 927942aabbbe50 David Howells 2010-06-11 179 */ 028db3e290f15a Linus Torvalds 2019-07-10 180 if (key->perm & KEY_POS_VIEW) { 028db3e290f15a Linus Torvalds 2019-07-10 181 rcu_read_lock(); e59428f721ee09 David Howells 2019-06-19 182 skey_ref = search_cred_keyrings_rcu(&ctx); 028db3e290f15a Linus Torvalds 2019-07-10 183 rcu_read_unlock(); 927942aabbbe50 David Howells 2010-06-11 184 if (!IS_ERR(skey_ref)) { 927942aabbbe50 David Howells 2010-06-11 185 key_ref_put(skey_ref); 927942aabbbe50 David Howells 2010-06-11 186 key_ref = make_key_ref(key, 1); 927942aabbbe50 David Howells 2010-06-11 187 } 927942aabbbe50 David Howells 2010-06-11 188 } 927942aabbbe50 David Howells 2010-06-11 189 4aa68e07d84556 Eric Biggers 2017-09-18 190 /* check whether the current task is allowed to view the key */ f5895943d91b41 David Howells 2014-03-14 191 rc = key_task_permission(key_ref, ctx.cred, KEY_NEED_VIEW); 06ec7be557a125 Michael LeMay 2006-06-26 192 if (rc < 0) 028db3e290f15a Linus Torvalds 2019-07-10 193 return 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 194 074d58989569b3 Baolin Wang 2017-11-15 195 now = ktime_get_real_seconds(); ^1da177e4c3f41 Linus Torvalds 2005-04-16 196 028db3e290f15a Linus Torvalds 2019-07-10 197 rcu_read_lock(); 028db3e290f15a Linus Torvalds 2019-07-10 198 ^1da177e4c3f41 Linus Torvalds 2005-04-16 199 /* come up with a suitable timeout value */ ab5c69f01313c8 Eric Biggers 2017-09-27 200 expiry = READ_ONCE(key->expiry); ab5c69f01313c8 Eric Biggers 2017-09-27 201 if (expiry == 0) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 202 memcpy(xbuf, "perm", 5); 074d58989569b3 Baolin Wang 2017-11-15 203 } else if (now >= expiry) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 204 memcpy(xbuf, "expd", 5); 7b1b9164598286 David Howells 2009-09-02 205 } else { 074d58989569b3 Baolin Wang 2017-11-15 206 timo = expiry - now; ^1da177e4c3f41 Linus Torvalds 2005-04-16 207 ^1da177e4c3f41 Linus Torvalds 2005-04-16 208 if (timo < 60) 074d58989569b3 Baolin Wang 2017-11-15 209 sprintf(xbuf, "%llus", timo); ^1da177e4c3f41 Linus Torvalds 2005-04-16 210 else if (timo < 60*60) 074d58989569b3 Baolin Wang 2017-11-15 211 sprintf(xbuf, "%llum", div_u64(timo, 60)); ^1da177e4c3f41 Linus Torvalds 2005-04-16 212 else if (timo < 60*60*24) 074d58989569b3 Baolin Wang 2017-11-15 @213 sprintf(xbuf, "%lluh", div_u64(timo, 60 * 60)); ^1da177e4c3f41 Linus Torvalds 2005-04-16 214 else if (timo < 60*60*24*7) 074d58989569b3 Baolin Wang 2017-11-15 215 sprintf(xbuf, "%llud", div_u64(timo, 60 * 60 * 24)); ^1da177e4c3f41 Linus Torvalds 2005-04-16 216 else 074d58989569b3 Baolin Wang 2017-11-15 @217 sprintf(xbuf, "%lluw", div_u64(timo, 60 * 60 * 24 * 7)); ^1da177e4c3f41 Linus Torvalds 2005-04-16 218 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 219 363b02dab09b32 David Howells 2017-10-04 220 state = key_read_state(key); 363b02dab09b32 David Howells 2017-10-04 221 :::::: The code at line 217 was first introduced by commit :::::: 074d58989569b39f04294c90ef36dd82b8c2cc1a security: keys: Replace time_t/timespec with time64_t :::::: TO: Baolin Wang <baolin.wang@xxxxxxxxxx> :::::: CC: David Howells <dhowells@xxxxxxxxxx> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
