Re: [PATCH v4 2/3] mm: introduce MAP_VALIDATE a mechanism for adding new mmap flags
From: kbuild test robot
Date: Thu Aug 17 2017 - 04:06:50 EST
Hi Dan,
[auto build test ERROR on linus/master]
[also build test ERROR on v4.13-rc5 next-20170816]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Dan-Williams/fs-xfs-introduce-S_IOMAP_SEALED/20170817-114711
config: xtensa-allmodconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 4.9.0
reproduce:
wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=xtensa
All errors (new ones prefixed by >>):
mm/mmap.c: In function 'do_mmap':
>> mm/mmap.c:1391:8: error: 'MAP_VALIDATE' undeclared (first use in this function)
case MAP_VALIDATE:
^
mm/mmap.c:1391:8: note: each undeclared identifier is reported only once for each function it appears in
vim +/MAP_VALIDATE +1391 mm/mmap.c
1316
1317 /*
1318 * The caller must hold down_write(¤t->mm->mmap_sem).
1319 */
1320 unsigned long do_mmap(struct file *file, unsigned long addr,
1321 unsigned long len, unsigned long prot,
1322 unsigned long flags, vm_flags_t vm_flags,
1323 unsigned long pgoff, unsigned long *populate,
1324 struct list_head *uf)
1325 {
1326 struct mm_struct *mm = current->mm;
1327 int pkey = 0;
1328
1329 *populate = 0;
1330
1331 if (!len)
1332 return -EINVAL;
1333
1334 /*
1335 * Does the application expect PROT_READ to imply PROT_EXEC?
1336 *
1337 * (the exception is when the underlying filesystem is noexec
1338 * mounted, in which case we dont add PROT_EXEC.)
1339 */
1340 if ((prot & PROT_READ) && (current->personality & READ_IMPLIES_EXEC))
1341 if (!(file && path_noexec(&file->f_path)))
1342 prot |= PROT_EXEC;
1343
1344 if (!(flags & MAP_FIXED))
1345 addr = round_hint_to_min(addr);
1346
1347 /* Careful about overflows.. */
1348 len = PAGE_ALIGN(len);
1349 if (!len)
1350 return -ENOMEM;
1351
1352 /* offset overflow? */
1353 if ((pgoff + (len >> PAGE_SHIFT)) < pgoff)
1354 return -EOVERFLOW;
1355
1356 /* Too many mappings? */
1357 if (mm->map_count > sysctl_max_map_count)
1358 return -ENOMEM;
1359
1360 /* Obtain the address to map to. we verify (or select) it and ensure
1361 * that it represents a valid section of the address space.
1362 */
1363 addr = get_unmapped_area(file, addr, len, pgoff, flags);
1364 if (offset_in_page(addr))
1365 return addr;
1366
1367 if (prot == PROT_EXEC) {
1368 pkey = execute_only_pkey(mm);
1369 if (pkey < 0)
1370 pkey = 0;
1371 }
1372
1373 /* Do simple checking here so the lower-level routines won't have
1374 * to. we assume access permissions have been handled by the open
1375 * of the memory object, so we don't do any here.
1376 */
1377 vm_flags |= calc_vm_prot_bits(prot, pkey) | calc_vm_flag_bits(flags) |
1378 mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
1379
1380 if (flags & MAP_LOCKED)
1381 if (!can_do_mlock())
1382 return -EPERM;
1383
1384 if (mlock_future_check(mm, vm_flags, len))
1385 return -EAGAIN;
1386
1387 if (file) {
1388 struct inode *inode = file_inode(file);
1389
1390 switch (flags & MAP_TYPE) {
> 1391 case MAP_VALIDATE:
1392 if (flags & ~(MAP_SUPPORTED_MASK | MAP_VALIDATE))
1393 return -EINVAL;
1394 if (!file->f_op->fmmap)
1395 return -EOPNOTSUPP;
1396 /* fall through */
1397 case MAP_SHARED:
1398 if ((prot&PROT_WRITE) && !(file->f_mode&FMODE_WRITE))
1399 return -EACCES;
1400
1401 /*
1402 * Make sure we don't allow writing to an append-only
1403 * file..
1404 */
1405 if (IS_APPEND(inode) && (file->f_mode & FMODE_WRITE))
1406 return -EACCES;
1407
1408 /*
1409 * Make sure there are no mandatory locks on the file.
1410 */
1411 if (locks_verify_locked(file))
1412 return -EAGAIN;
1413
1414 vm_flags |= VM_SHARED | VM_MAYSHARE;
1415 if (!(file->f_mode & FMODE_WRITE))
1416 vm_flags &= ~(VM_MAYWRITE | VM_SHARED);
1417
1418 /* fall through */
1419 case MAP_PRIVATE:
1420 if (!(file->f_mode & FMODE_READ))
1421 return -EACCES;
1422 if (path_noexec(&file->f_path)) {
1423 if (vm_flags & VM_EXEC)
1424 return -EPERM;
1425 vm_flags &= ~VM_MAYEXEC;
1426 }
1427
1428 if (!file->f_op->mmap)
1429 return -ENODEV;
1430 if (vm_flags & (VM_GROWSDOWN|VM_GROWSUP))
1431 return -EINVAL;
1432 break;
1433
1434 default:
1435 return -EINVAL;
1436 }
1437 } else {
1438 switch (flags & MAP_TYPE) {
1439 case MAP_SHARED:
1440 if (vm_flags & (VM_GROWSDOWN|VM_GROWSUP))
1441 return -EINVAL;
1442 /*
1443 * Ignore pgoff.
1444 */
1445 pgoff = 0;
1446 vm_flags |= VM_SHARED | VM_MAYSHARE;
1447 break;
1448 case MAP_PRIVATE:
1449 /*
1450 * Set pgoff according to addr for anon_vma.
1451 */
1452 pgoff = addr >> PAGE_SHIFT;
1453 break;
1454 default:
1455 return -EINVAL;
1456 }
1457 }
1458
1459 /*
1460 * Set 'VM_NORESERVE' if we should not account for the
1461 * memory use of this mapping.
1462 */
1463 if (flags & MAP_NORESERVE) {
1464 /* We honor MAP_NORESERVE if allowed to overcommit */
1465 if (sysctl_overcommit_memory != OVERCOMMIT_NEVER)
1466 vm_flags |= VM_NORESERVE;
1467
1468 /* hugetlb applies strict overcommit unless MAP_NORESERVE */
1469 if (file && is_file_hugepages(file))
1470 vm_flags |= VM_NORESERVE;
1471 }
1472
1473 if ((flags & MAP_VALIDATE) == MAP_VALIDATE)
1474 flags &= MAP_SUPPORTED_MASK;
1475 else
1476 flags = 0;
1477
1478 addr = mmap_region(file, addr, len, vm_flags, pgoff, uf, flags);
1479 if (!IS_ERR_VALUE(addr) &&
1480 ((vm_flags & VM_LOCKED) ||
1481 (flags & (MAP_POPULATE | MAP_NONBLOCK)) == MAP_POPULATE))
1482 *populate = len;
1483 return addr;
1484 }
1485
---
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.config.gz
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