[net-next:master 332/339] kernel//bpf/syscall.c:1404:23: warning: cast to pointer from integer of different size
From: kbuild test robot <hidden>
Date: 2017-09-29 06:55:06
tree: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
head: fa8fefaa678ea390b873195d19c09930da84a4bb
commit: cb4d2b3f03d8eed90be3a194e5b54b734ec4bbe9 [332/339] bpf: Add name, load_time, uid and map_ids to bpf_prog_info
config: blackfin-allmodconfig (attached as .config)
compiler: bfin-uclinux-gcc (GCC) 6.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout cb4d2b3f03d8eed90be3a194e5b54b734ec4bbe9
# save the attached .config to linux build tree
make.cross ARCH=blackfin
All warnings (new ones prefixed by >>):
kernel//bpf/syscall.c: In function 'bpf_prog_get_info_by_fd':quoted
kernel//bpf/syscall.c:1404:23: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
u32 *user_map_ids = (u32 *)info.map_ids;
^
vim +1404 kernel//bpf/syscall.c
1371
1372 static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
1373 const union bpf_attr *attr,
1374 union bpf_attr __user *uattr)
1375 {
1376 struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info);
1377 struct bpf_prog_info info = {};
1378 u32 info_len = attr->info.info_len;
1379 char __user *uinsns;
1380 u32 ulen;
1381 int err;
1382
1383 err = check_uarg_tail_zero(uinfo, sizeof(info), info_len);
1384 if (err)
1385 return err;
1386 info_len = min_t(u32, sizeof(info), info_len);
1387
1388 if (copy_from_user(&info, uinfo, info_len))
1389 return -EFAULT;
1390
1391 info.type = prog->type;
1392 info.id = prog->aux->id;
1393 info.load_time = prog->aux->load_time;
1394 info.created_by_uid = from_kuid_munged(current_user_ns(),
1395 prog->aux->user->uid);
1396
1397 memcpy(info.tag, prog->tag, sizeof(prog->tag));
1398 memcpy(info.name, prog->aux->name, sizeof(prog->aux->name));
1399
1400 ulen = info.nr_map_ids;
1401 info.nr_map_ids = prog->aux->used_map_cnt;
1402 ulen = min_t(u32, info.nr_map_ids, ulen);
1403 if (ulen) {1404 u32 *user_map_ids = (u32 *)info.map_ids;
1405 u32 i;
1406
1407 for (i = 0; i < ulen; i++)
1408 if (put_user(prog->aux->used_maps[i]->id,
1409 &user_map_ids[i]))
1410 return -EFAULT;
1411 }
1412
1413 if (!capable(CAP_SYS_ADMIN)) {
1414 info.jited_prog_len = 0;
1415 info.xlated_prog_len = 0;
1416 goto done;
1417 }
1418
1419 ulen = info.jited_prog_len;
1420 info.jited_prog_len = prog->jited_len;
1421 if (info.jited_prog_len && ulen) {
1422 uinsns = u64_to_user_ptr(info.jited_prog_insns);
1423 ulen = min_t(u32, info.jited_prog_len, ulen);
1424 if (copy_to_user(uinsns, prog->bpf_func, ulen))
1425 return -EFAULT;
1426 }
1427
1428 ulen = info.xlated_prog_len;
1429 info.xlated_prog_len = bpf_prog_insn_size(prog);
1430 if (info.xlated_prog_len && ulen) {
1431 uinsns = u64_to_user_ptr(info.xlated_prog_insns);
1432 ulen = min_t(u32, info.xlated_prog_len, ulen);
1433 if (copy_to_user(uinsns, prog->insnsi, ulen))
1434 return -EFAULT;
1435 }
1436
1437 done:
1438 if (copy_to_user(uinfo, &info, info_len) ||
1439 put_user(info_len, &uattr->info.info_len))
1440 return -EFAULT;
1441
1442 return 0;
1443 }
1444
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