Hi Al, FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 4b162c530d9c101381500e586fedb1340595a6ff commit: 468138d78510688fb5476f98d23f11ac6a63229a binfmt_flat: flat_{get,put}_addr_from_rp() should be able to fail date: 3 weeks ago config: m32r-mappi.nommu_defconfig (attached as .config) compiler: m32r-linux-gcc (GCC) 6.2.0 reproduce: wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 468138d78510688fb5476f98d23f11ac6a63229a # save the attached .config to linux build tree make.cross ARCH=m32r All errors (new ones prefixed by >>): In file included from include/linux/kernel.h:13:0, from fs/binfmt_flat.c:20: fs/binfmt_flat.c: In function 'load_flat_file': include/linux/kern_levels.h:4:18: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'u32 {aka unsigned int}' [-Wformat=] #define KERN_SOH "\001" /* ASCII Start Of Header */ ^ include/linux/printk.h:136:11: note: in definition of macro 'no_printk' printk(fmt, ##__VA_ARGS__); \ ^~~ include/linux/kern_levels.h:14:20: note: in expansion of macro 'KERN_SOH' #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */ ^~~~~~~~ include/linux/printk.h:339:12: note: in expansion of macro 'KERN_DEBUG' no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) ^~~~~~~~~~ fs/binfmt_flat.c:577:3: note: in expansion of macro 'pr_debug' pr_debug("Allocated data+bss+stack (%ld bytes): %lx\n", ^~~~~~~~ >> fs/binfmt_flat.c:828:9: error: void value not ignored as it ought to be ret = flat_put_addr_at_rp(rp, addr, relval); ^ vim +828 fs/binfmt_flat.c 506 507 /* 508 * Check initial limits. This avoids letting people circumvent 509 * size limits imposed on them by creating programs with large 510 * arrays in the data or bss. 511 */ 512 rlim = rlimit(RLIMIT_DATA); 513 if (rlim >= RLIM_INFINITY) 514 rlim = ~0; 515 if (data_len + bss_len > rlim) { 516 ret = -ENOMEM; 517 goto err; 518 } 519 520 /* Flush all traces of the currently running executable */ 521 if (id == 0) { 522 ret = flush_old_exec(bprm); 523 if (ret) 524 goto err; 525 526 /* OK, This is the point of no return */ 527 set_personality(PER_LINUX_32BIT); 528 setup_new_exec(bprm); 529 } 530 531 /* 532 * calculate the extra space we need to map in 533 */ 534 extra = max_t(unsigned long, bss_len + stack_len, 535 relocs * sizeof(unsigned long)); 536 537 /* 538 * there are a couple of cases here, the separate code/data 539 * case, and then the fully copied to RAM case which lumps 540 * it all together. 541 */ 542 if (!IS_ENABLED(CONFIG_MMU) && !(flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP))) { 543 /* 544 * this should give us a ROM ptr, but if it doesn't we don't 545 * really care 546 */ 547 pr_debug("ROM mapping of file (we hope)\n"); 548 549 textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, 550 MAP_PRIVATE|MAP_EXECUTABLE, 0); 551 if (!textpos || IS_ERR_VALUE(textpos)) { 552 ret = textpos; 553 if (!textpos) 554 ret = -ENOMEM; 555 pr_err("Unable to mmap process text, errno %d\n", ret); 556 goto err; 557 } 558 559 len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); 560 len = PAGE_ALIGN(len); 561 realdatastart = vm_mmap(NULL, 0, len, 562 PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); 563 564 if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { 565 ret = realdatastart; 566 if (!realdatastart) 567 ret = -ENOMEM; 568 pr_err("Unable to allocate RAM for process data, " 569 "errno %d\n", ret); 570 vm_munmap(textpos, text_len); 571 goto err; 572 } 573 datapos = ALIGN(realdatastart + 574 MAX_SHARED_LIBS * sizeof(unsigned long), 575 FLAT_DATA_ALIGN); 576 577 pr_debug("Allocated data+bss+stack (%ld bytes): %lx\n", 578 data_len + bss_len + stack_len, datapos); 579 580 fpos = ntohl(hdr->data_start); 581 #ifdef CONFIG_BINFMT_ZFLAT 582 if (flags & FLAT_FLAG_GZDATA) { 583 result = decompress_exec(bprm, fpos, (char *)datapos, 584 full_data, 0); 585 } else 586 #endif 587 { 588 result = read_code(bprm->file, datapos, fpos, 589 full_data); 590 } 591 if (IS_ERR_VALUE(result)) { 592 ret = result; 593 pr_err("Unable to read data+bss, errno %d\n", ret); 594 vm_munmap(textpos, text_len); 595 vm_munmap(realdatastart, len); 596 goto err; 597 } 598 599 reloc = (u32 __user *) 600 (datapos + (ntohl(hdr->reloc_start) - text_len)); 601 memp = realdatastart; 602 memp_size = len; 603 } else { 604 605 len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(u32); 606 len = PAGE_ALIGN(len); 607 textpos = vm_mmap(NULL, 0, len, 608 PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); 609 610 if (!textpos || IS_ERR_VALUE(textpos)) { 611 ret = textpos; 612 if (!textpos) 613 ret = -ENOMEM; 614 pr_err("Unable to allocate RAM for process text/data, " 615 "errno %d\n", ret); 616 goto err; 617 } 618 619 realdatastart = textpos + ntohl(hdr->data_start); 620 datapos = ALIGN(realdatastart + 621 MAX_SHARED_LIBS * sizeof(u32), 622 FLAT_DATA_ALIGN); 623 624 reloc = (u32 __user *) 625 (datapos + (ntohl(hdr->reloc_start) - text_len)); 626 memp = textpos; 627 memp_size = len; 628 #ifdef CONFIG_BINFMT_ZFLAT 629 /* 630 * load it all in and treat it like a RAM load from now on 631 */ 632 if (flags & FLAT_FLAG_GZIP) { 633 #ifndef CONFIG_MMU 634 result = decompress_exec(bprm, sizeof(struct flat_hdr), 635 (((char *)textpos) + sizeof(struct flat_hdr)), 636 (text_len + full_data 637 - sizeof(struct flat_hdr)), 638 0); 639 memmove((void *) datapos, (void *) realdatastart, 640 full_data); 641 #else 642 /* 643 * This is used on MMU systems mainly for testing. 644 * Let's use a kernel buffer to simplify things. 645 */ 646 long unz_text_len = text_len - sizeof(struct flat_hdr); 647 long unz_len = unz_text_len + full_data; 648 char *unz_data = vmalloc(unz_len); 649 if (!unz_data) { 650 result = -ENOMEM; 651 } else { 652 result = decompress_exec(bprm, sizeof(struct flat_hdr), 653 unz_data, unz_len, 0); 654 if (result == 0 && 655 (copy_to_user((void __user *)textpos + sizeof(struct flat_hdr), 656 unz_data, unz_text_len) || 657 copy_to_user((void __user *)datapos, 658 unz_data + unz_text_len, full_data))) 659 result = -EFAULT; 660 vfree(unz_data); 661 } 662 #endif 663 } else if (flags & FLAT_FLAG_GZDATA) { 664 result = read_code(bprm->file, textpos, 0, text_len); 665 if (!IS_ERR_VALUE(result)) { 666 #ifndef CONFIG_MMU 667 result = decompress_exec(bprm, text_len, (char *) datapos, 668 full_data, 0); 669 #else 670 char *unz_data = vmalloc(full_data); 671 if (!unz_data) { 672 result = -ENOMEM; 673 } else { 674 result = decompress_exec(bprm, text_len, 675 unz_data, full_data, 0); 676 if (result == 0 && 677 copy_to_user((void __user *)datapos, 678 unz_data, full_data)) 679 result = -EFAULT; 680 vfree(unz_data); 681 } 682 #endif 683 } 684 } else 685 #endif /* CONFIG_BINFMT_ZFLAT */ 686 { 687 result = read_code(bprm->file, textpos, 0, text_len); 688 if (!IS_ERR_VALUE(result)) 689 result = read_code(bprm->file, datapos, 690 ntohl(hdr->data_start), 691 full_data); 692 } 693 if (IS_ERR_VALUE(result)) { 694 ret = result; 695 pr_err("Unable to read code+data+bss, errno %d\n", ret); 696 vm_munmap(textpos, text_len + data_len + extra + 697 MAX_SHARED_LIBS * sizeof(u32)); 698 goto err; 699 } 700 } 701 702 start_code = textpos + sizeof(struct flat_hdr); 703 end_code = textpos + text_len; 704 text_len -= sizeof(struct flat_hdr); /* the real code len */ 705 706 /* The main program needs a little extra setup in the task structure */ 707 if (id == 0) { 708 current->mm->start_code = start_code; 709 current->mm->end_code = end_code; 710 current->mm->start_data = datapos; 711 current->mm->end_data = datapos + data_len; 712 /* 713 * set up the brk stuff, uses any slack left in data/bss/stack 714 * allocation. We put the brk after the bss (between the bss 715 * and stack) like other platforms. 716 * Userspace code relies on the stack pointer starting out at 717 * an address right at the end of a page. 718 */ 719 current->mm->start_brk = datapos + data_len + bss_len; 720 current->mm->brk = (current->mm->start_brk + 3) & ~3; 721 #ifndef CONFIG_MMU 722 current->mm->context.end_brk = memp + memp_size - stack_len; 723 #endif 724 } 725 726 if (flags & FLAT_FLAG_KTRACE) { 727 pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n", 728 textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); 729 pr_info("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n", 730 id ? "Lib" : "Load", bprm->filename, 731 start_code, end_code, datapos, datapos + data_len, 732 datapos + data_len, (datapos + data_len + bss_len + 3) & ~3); 733 } 734 735 /* Store the current module values into the global library structure */ 736 libinfo->lib_list[id].start_code = start_code; 737 libinfo->lib_list[id].start_data = datapos; 738 libinfo->lib_list[id].start_brk = datapos + data_len + bss_len; 739 libinfo->lib_list[id].text_len = text_len; 740 libinfo->lib_list[id].loaded = 1; 741 libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; 742 libinfo->lib_list[id].build_date = ntohl(hdr->build_date); 743 744 /* 745 * We just load the allocations into some temporary memory to 746 * help simplify all this mumbo jumbo 747 * 748 * We've got two different sections of relocation entries. 749 * The first is the GOT which resides at the beginning of the data segment 750 * and is terminated with a -1. This one can be relocated in place. 751 * The second is the extra relocation entries tacked after the image's 752 * data segment. These require a little more processing as the entry is 753 * really an offset into the image which contains an offset into the 754 * image. 755 */ 756 if (flags & FLAT_FLAG_GOTPIC) { 757 for (rp = (u32 __user *)datapos; ; rp++) { 758 u32 addr, rp_val; 759 if (get_user(rp_val, rp)) 760 return -EFAULT; 761 if (rp_val == 0xffffffff) 762 break; 763 if (rp_val) { 764 addr = calc_reloc(rp_val, libinfo, id, 0); 765 if (addr == RELOC_FAILED) { 766 ret = -ENOEXEC; 767 goto err; 768 } 769 if (put_user(addr, rp)) 770 return -EFAULT; 771 } 772 } 773 } 774 775 /* 776 * Now run through the relocation entries. 777 * We've got to be careful here as C++ produces relocatable zero 778 * entries in the constructor and destructor tables which are then 779 * tested for being not zero (which will always occur unless we're 780 * based from address zero). This causes an endless loop as __start 781 * is at zero. The solution used is to not relocate zero addresses. 782 * This has the negative side effect of not allowing a global data 783 * reference to be statically initialised to _stext (I've moved 784 * __start to address 4 so that is okay). 785 */ 786 if (rev > OLD_FLAT_VERSION) { 787 u32 __maybe_unused persistent = 0; 788 for (i = 0; i < relocs; i++) { 789 u32 addr, relval; 790 791 /* 792 * Get the address of the pointer to be 793 * relocated (of course, the address has to be 794 * relocated first). 795 */ 796 if (get_user(relval, reloc + i)) 797 return -EFAULT; 798 relval = ntohl(relval); 799 if (flat_set_persistent(relval, &persistent)) 800 continue; 801 addr = flat_get_relocate_addr(relval); 802 rp = (u32 __user *)calc_reloc(addr, libinfo, id, 1); 803 if (rp == (u32 __user *)RELOC_FAILED) { 804 ret = -ENOEXEC; 805 goto err; 806 } 807 808 /* Get the pointer's value. */ 809 ret = flat_get_addr_from_rp(rp, relval, flags, 810 &addr, &persistent); 811 if (unlikely(ret)) 812 goto err; 813 814 if (addr != 0) { 815 /* 816 * Do the relocation. PIC relocs in the data section are 817 * already in target order 818 */ 819 if ((flags & FLAT_FLAG_GOTPIC) == 0) 820 addr = ntohl(addr); 821 addr = calc_reloc(addr, libinfo, id, 0); 822 if (addr == RELOC_FAILED) { 823 ret = -ENOEXEC; 824 goto err; 825 } 826 827 /* Write back the relocated pointer. */ > 828 ret = flat_put_addr_at_rp(rp, addr, > relval); 829 if (unlikely(ret)) 830 goto err; 831 } 832 } 833 } else { 834 for (i = 0; i < relocs; i++) { 835 u32 relval; 836 if (get_user(relval, reloc + i)) 837 return -EFAULT; 838 relval = ntohl(relval); 839 old_reloc(relval); 840 } 841 } 842 843 flush_icache_range(start_code, end_code); 844 845 /* zero the BSS, BRK and stack areas */ 846 if (clear_user((void __user *)(datapos + data_len), bss_len + 847 (memp + memp_size - stack_len - /* end brk */ 848 libinfo->lib_list[id].start_brk) + /* start brk */ 849 stack_len)) 850 return -EFAULT; 851 852 return 0; 853 err: 854 return ret; 855 } 856 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
.config.gz
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