:::::: :::::: Manual check reason: "low confidence bisect report" :::::: Manual check reason: "low confidence static check warning: fs/remap_range.c:571:17: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]" ::::::
BCC: l...@intel.com CC: kbuild-...@lists.01.org TO: "Darrick J. Wong" <darrick.w...@oracle.com> tree: https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git vectorized-scrub head: 1d79555b9e2bc74efef217aee3f208794112be10 commit: 23eba991e1a20b4a71314c01541d2e30af80a809 [202/411] vfs: introduce new file range exchange ioctl :::::: branch date: 12 days ago :::::: commit date: 12 days ago config: arm-randconfig-c002-20220804 (https://download.01.org/0day-ci/archive/20220807/202208072326.y46dqvlu-...@intel.com/config) compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git/commit/?id=23eba991e1a20b4a71314c01541d2e30af80a809 git remote add djwong-xfs https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git git fetch --no-tags djwong-xfs vectorized-scrub git checkout 23eba991e1a20b4a71314c01541d2e30af80a809 # save the config file COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross ARCH=arm KBUILD_USERCFLAGS='-fanalyzer -Wno-error' If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <l...@intel.com> gcc-analyzer warnings: (new ones prefixed by >>) fs/remap_range.c: In function 'generic_xchg_file_range_checks': >> fs/remap_range.c:571:17: warning: use of uninitialized value '<unknown>' >> [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 571 | int64_t test_len; | ^~~~~~~~ 'generic_xchg_file_range_checks': event 1 | | 571 | int64_t test_len; | | ^~~~~~~~ | | | | | (1) use of uninitialized value '<unknown>' here | vim +571 fs/remap_range.c 23eba991e1a20b Darrick J. Wong 2022-07-14 561 23eba991e1a20b Darrick J. Wong 2022-07-14 562 /* Performs necessary checks before doing a range exchange. */ 23eba991e1a20b Darrick J. Wong 2022-07-14 563 static int generic_xchg_file_range_checks(struct file *file1, 23eba991e1a20b Darrick J. Wong 2022-07-14 564 struct file *file2, 23eba991e1a20b Darrick J. Wong 2022-07-14 565 struct file_xchg_range *fxr, 23eba991e1a20b Darrick J. Wong 2022-07-14 566 unsigned int blocksize) 23eba991e1a20b Darrick J. Wong 2022-07-14 567 { 23eba991e1a20b Darrick J. Wong 2022-07-14 568 struct inode *inode1 = file1->f_mapping->host; 23eba991e1a20b Darrick J. Wong 2022-07-14 569 struct inode *inode2 = file2->f_mapping->host; 23eba991e1a20b Darrick J. Wong 2022-07-14 570 uint64_t blkmask = blocksize - 1; 23eba991e1a20b Darrick J. Wong 2022-07-14 @571 int64_t test_len; 23eba991e1a20b Darrick J. Wong 2022-07-14 572 uint64_t blen; 23eba991e1a20b Darrick J. Wong 2022-07-14 573 loff_t size1, size2; 23eba991e1a20b Darrick J. Wong 2022-07-14 574 int ret; 23eba991e1a20b Darrick J. Wong 2022-07-14 575 23eba991e1a20b Darrick J. Wong 2022-07-14 576 /* Don't touch certain kinds of inodes */ 23eba991e1a20b Darrick J. Wong 2022-07-14 577 if (IS_IMMUTABLE(inode1) || IS_IMMUTABLE(inode2)) 23eba991e1a20b Darrick J. Wong 2022-07-14 578 return -EPERM; 23eba991e1a20b Darrick J. Wong 2022-07-14 579 if (IS_SWAPFILE(inode1) || IS_SWAPFILE(inode2)) 23eba991e1a20b Darrick J. Wong 2022-07-14 580 return -ETXTBSY; 23eba991e1a20b Darrick J. Wong 2022-07-14 581 23eba991e1a20b Darrick J. Wong 2022-07-14 582 size1 = i_size_read(inode1); 23eba991e1a20b Darrick J. Wong 2022-07-14 583 size2 = i_size_read(inode2); 23eba991e1a20b Darrick J. Wong 2022-07-14 584 23eba991e1a20b Darrick J. Wong 2022-07-14 585 /* Ranges cannot start after EOF. */ 23eba991e1a20b Darrick J. Wong 2022-07-14 586 if (fxr->file1_offset > size1 || fxr->file2_offset > size2) 23eba991e1a20b Darrick J. Wong 2022-07-14 587 return -EINVAL; 23eba991e1a20b Darrick J. Wong 2022-07-14 588 23eba991e1a20b Darrick J. Wong 2022-07-14 589 /* 23eba991e1a20b Darrick J. Wong 2022-07-14 590 * If the caller asked for full files, check that the offset/length 23eba991e1a20b Darrick J. Wong 2022-07-14 591 * values cover all of both files. 23eba991e1a20b Darrick J. Wong 2022-07-14 592 */ 23eba991e1a20b Darrick J. Wong 2022-07-14 593 if ((fxr->flags & FILE_XCHG_RANGE_FULL_FILES) && 23eba991e1a20b Darrick J. Wong 2022-07-14 594 (fxr->file1_offset != 0 || fxr->file2_offset != 0 || 23eba991e1a20b Darrick J. Wong 2022-07-14 595 fxr->length != size1 || fxr->length != size2)) 23eba991e1a20b Darrick J. Wong 2022-07-14 596 return -EDOM; 23eba991e1a20b Darrick J. Wong 2022-07-14 597 23eba991e1a20b Darrick J. Wong 2022-07-14 598 /* 23eba991e1a20b Darrick J. Wong 2022-07-14 599 * If the caller said to exchange to EOF, we set the length of the 23eba991e1a20b Darrick J. Wong 2022-07-14 600 * request large enough to cover everything to the end of both files. 23eba991e1a20b Darrick J. Wong 2022-07-14 601 */ 23eba991e1a20b Darrick J. Wong 2022-07-14 602 if (fxr->flags & FILE_XCHG_RANGE_TO_EOF) 23eba991e1a20b Darrick J. Wong 2022-07-14 603 fxr->length = max_t(int64_t, size1 - fxr->file1_offset, 23eba991e1a20b Darrick J. Wong 2022-07-14 604 size2 - fxr->file2_offset); 23eba991e1a20b Darrick J. Wong 2022-07-14 605 23eba991e1a20b Darrick J. Wong 2022-07-14 606 /* The start of both ranges must be aligned to an fs block. */ 23eba991e1a20b Darrick J. Wong 2022-07-14 607 if (!IS_ALIGNED(fxr->file1_offset, blocksize) || 23eba991e1a20b Darrick J. Wong 2022-07-14 608 !IS_ALIGNED(fxr->file2_offset, blocksize)) 23eba991e1a20b Darrick J. Wong 2022-07-14 609 return -EINVAL; 23eba991e1a20b Darrick J. Wong 2022-07-14 610 23eba991e1a20b Darrick J. Wong 2022-07-14 611 /* Ensure offsets don't wrap. */ 23eba991e1a20b Darrick J. Wong 2022-07-14 612 if (fxr->file1_offset + fxr->length < fxr->file1_offset || 23eba991e1a20b Darrick J. Wong 2022-07-14 613 fxr->file2_offset + fxr->length < fxr->file2_offset) 23eba991e1a20b Darrick J. Wong 2022-07-14 614 return -EINVAL; 23eba991e1a20b Darrick J. Wong 2022-07-14 615 23eba991e1a20b Darrick J. Wong 2022-07-14 616 /* 23eba991e1a20b Darrick J. Wong 2022-07-14 617 * We require both ranges to be within EOF, unless we're exchanging 23eba991e1a20b Darrick J. Wong 2022-07-14 618 * to EOF. generic_xchg_range_prep already checked that both 23eba991e1a20b Darrick J. Wong 2022-07-14 619 * fxr->file1_offset and fxr->file2_offset are within EOF. 23eba991e1a20b Darrick J. Wong 2022-07-14 620 */ 23eba991e1a20b Darrick J. Wong 2022-07-14 621 if (!(fxr->flags & FILE_XCHG_RANGE_TO_EOF) && 23eba991e1a20b Darrick J. Wong 2022-07-14 622 (fxr->file1_offset + fxr->length > size1 || 23eba991e1a20b Darrick J. Wong 2022-07-14 623 fxr->file2_offset + fxr->length > size2)) 23eba991e1a20b Darrick J. Wong 2022-07-14 624 return -EINVAL; 23eba991e1a20b Darrick J. Wong 2022-07-14 625 23eba991e1a20b Darrick J. Wong 2022-07-14 626 /* 23eba991e1a20b Darrick J. Wong 2022-07-14 627 * Make sure we don't hit any file size limits. If we hit any size 23eba991e1a20b Darrick J. Wong 2022-07-14 628 * limits such that test_length was adjusted, we abort the whole 23eba991e1a20b Darrick J. Wong 2022-07-14 629 * operation. 23eba991e1a20b Darrick J. Wong 2022-07-14 630 */ 23eba991e1a20b Darrick J. Wong 2022-07-14 631 test_len = fxr->length; 23eba991e1a20b Darrick J. Wong 2022-07-14 632 ret = generic_write_check_limits(file2, fxr->file2_offset, &test_len); 23eba991e1a20b Darrick J. Wong 2022-07-14 633 if (ret) 23eba991e1a20b Darrick J. Wong 2022-07-14 634 return ret; 23eba991e1a20b Darrick J. Wong 2022-07-14 635 ret = generic_write_check_limits(file1, fxr->file1_offset, &test_len); 23eba991e1a20b Darrick J. Wong 2022-07-14 636 if (ret) 23eba991e1a20b Darrick J. Wong 2022-07-14 637 return ret; 23eba991e1a20b Darrick J. Wong 2022-07-14 638 if (test_len != fxr->length) 23eba991e1a20b Darrick J. Wong 2022-07-14 639 return -EINVAL; 23eba991e1a20b Darrick J. Wong 2022-07-14 640 23eba991e1a20b Darrick J. Wong 2022-07-14 641 /* 23eba991e1a20b Darrick J. Wong 2022-07-14 642 * If the user wanted us to exchange up to the infile's EOF, round up 23eba991e1a20b Darrick J. Wong 2022-07-14 643 * to the next block boundary for this check. Do the same for the 23eba991e1a20b Darrick J. Wong 2022-07-14 644 * outfile. 23eba991e1a20b Darrick J. Wong 2022-07-14 645 * 23eba991e1a20b Darrick J. Wong 2022-07-14 646 * Otherwise, reject the range length if it's not block aligned. We 23eba991e1a20b Darrick J. Wong 2022-07-14 647 * already confirmed the starting offsets' block alignment. 23eba991e1a20b Darrick J. Wong 2022-07-14 648 */ 23eba991e1a20b Darrick J. Wong 2022-07-14 649 if (fxr->file1_offset + fxr->length == size1) 23eba991e1a20b Darrick J. Wong 2022-07-14 650 blen = ALIGN(size1, blocksize) - fxr->file1_offset; 23eba991e1a20b Darrick J. Wong 2022-07-14 651 else if (fxr->file2_offset + fxr->length == size2) 23eba991e1a20b Darrick J. Wong 2022-07-14 652 blen = ALIGN(size2, blocksize) - fxr->file2_offset; 23eba991e1a20b Darrick J. Wong 2022-07-14 653 else if (!IS_ALIGNED(fxr->length, blocksize)) 23eba991e1a20b Darrick J. Wong 2022-07-14 654 return -EINVAL; 23eba991e1a20b Darrick J. Wong 2022-07-14 655 else 23eba991e1a20b Darrick J. Wong 2022-07-14 656 blen = fxr->length; 23eba991e1a20b Darrick J. Wong 2022-07-14 657 23eba991e1a20b Darrick J. Wong 2022-07-14 658 /* Don't allow overlapped exchanges within the same file. */ 23eba991e1a20b Darrick J. Wong 2022-07-14 659 if (inode1 == inode2 && 23eba991e1a20b Darrick J. Wong 2022-07-14 660 fxr->file2_offset + blen > fxr->file1_offset && 23eba991e1a20b Darrick J. Wong 2022-07-14 661 fxr->file1_offset + blen > fxr->file2_offset) 23eba991e1a20b Darrick J. Wong 2022-07-14 662 return -EINVAL; 23eba991e1a20b Darrick J. Wong 2022-07-14 663 23eba991e1a20b Darrick J. Wong 2022-07-14 664 /* If we already failed the freshness check, we're done. */ 23eba991e1a20b Darrick J. Wong 2022-07-14 665 ret = generic_xchg_file_range_check_fresh(inode2, fxr); 23eba991e1a20b Darrick J. Wong 2022-07-14 666 if (ret) 23eba991e1a20b Darrick J. Wong 2022-07-14 667 return ret; 23eba991e1a20b Darrick J. Wong 2022-07-14 668 23eba991e1a20b Darrick J. Wong 2022-07-14 669 /* 23eba991e1a20b Darrick J. Wong 2022-07-14 670 * Ensure that we don't exchange a partial EOF block into the middle of 23eba991e1a20b Darrick J. Wong 2022-07-14 671 * another file. 23eba991e1a20b Darrick J. Wong 2022-07-14 672 */ 23eba991e1a20b Darrick J. Wong 2022-07-14 673 if ((fxr->length & blkmask) == 0) 23eba991e1a20b Darrick J. Wong 2022-07-14 674 return 0; 23eba991e1a20b Darrick J. Wong 2022-07-14 675 23eba991e1a20b Darrick J. Wong 2022-07-14 676 blen = fxr->length; 23eba991e1a20b Darrick J. Wong 2022-07-14 677 if (fxr->file2_offset + blen < size2) 23eba991e1a20b Darrick J. Wong 2022-07-14 678 blen &= ~blkmask; 23eba991e1a20b Darrick J. Wong 2022-07-14 679 23eba991e1a20b Darrick J. Wong 2022-07-14 680 if (fxr->file1_offset + blen < size1) 23eba991e1a20b Darrick J. Wong 2022-07-14 681 blen &= ~blkmask; 23eba991e1a20b Darrick J. Wong 2022-07-14 682 23eba991e1a20b Darrick J. Wong 2022-07-14 683 return blen == fxr->length ? 0 : -EINVAL; 23eba991e1a20b Darrick J. Wong 2022-07-14 684 } 23eba991e1a20b Darrick J. Wong 2022-07-14 685 -- 0-DAY CI Kernel Test Service https://01.org/lkp _______________________________________________ kbuild mailing list -- kbuild@lists.01.org To unsubscribe send an email to kbuild-le...@lists.01.org
