Hi, kernel test robot noticed the following build errors: [auto build test ERROR on akpm-mm/mm-everything] [also build test ERROR on linus/master v6.12-rc3 next-20241018] [cannot apply to kees/for-next/pstore kees/for-next/kspp linux/master] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/jeffxu-chromium-org/mseal-Two-fixes-for-madvise-MADV_DONTNEED-when-sealed/20241017-085203 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20241017005105.3047458-2-jeffxu%40chromium.org patch subject: [PATCH v1 1/2] mseal: Two fixes for madvise(MADV_DONTNEED) when sealed config: i386-defconfig (https://download.01.org/0day-ci/archive/20241020/202410201724.kKCsANsw-lkp@xxxxxxxxx/config) compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241020/202410201724.kKCsANsw-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/202410201724.kKCsANsw-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): >> mm/mprotect.c:825:16: error: use of undeclared identifier 'VM_WASWRITE' 825 | newflags |= VM_WASWRITE; | ^ 1 error generated. vim +/VM_WASWRITE +825 mm/mprotect.c 705 706 /* 707 * pkey==-1 when doing a legacy mprotect() 708 */ 709 static int do_mprotect_pkey(unsigned long start, size_t len, 710 unsigned long prot, int pkey) 711 { 712 unsigned long nstart, end, tmp, reqprot; 713 struct vm_area_struct *vma, *prev; 714 int error; 715 const int grows = prot & (PROT_GROWSDOWN|PROT_GROWSUP); 716 const bool rier = (current->personality & READ_IMPLIES_EXEC) && 717 (prot & PROT_READ); 718 struct mmu_gather tlb; 719 struct vma_iterator vmi; 720 721 start = untagged_addr(start); 722 723 prot &= ~(PROT_GROWSDOWN|PROT_GROWSUP); 724 if (grows == (PROT_GROWSDOWN|PROT_GROWSUP)) /* can't be both */ 725 return -EINVAL; 726 727 if (start & ~PAGE_MASK) 728 return -EINVAL; 729 if (!len) 730 return 0; 731 len = PAGE_ALIGN(len); 732 end = start + len; 733 if (end <= start) 734 return -ENOMEM; 735 if (!arch_validate_prot(prot, start)) 736 return -EINVAL; 737 738 reqprot = prot; 739 740 if (mmap_write_lock_killable(current->mm)) 741 return -EINTR; 742 743 /* 744 * If userspace did not allocate the pkey, do not let 745 * them use it here. 746 */ 747 error = -EINVAL; 748 if ((pkey != -1) && !mm_pkey_is_allocated(current->mm, pkey)) 749 goto out; 750 751 vma_iter_init(&vmi, current->mm, start); 752 vma = vma_find(&vmi, end); 753 error = -ENOMEM; 754 if (!vma) 755 goto out; 756 757 if (unlikely(grows & PROT_GROWSDOWN)) { 758 if (vma->vm_start >= end) 759 goto out; 760 start = vma->vm_start; 761 error = -EINVAL; 762 if (!(vma->vm_flags & VM_GROWSDOWN)) 763 goto out; 764 } else { 765 if (vma->vm_start > start) 766 goto out; 767 if (unlikely(grows & PROT_GROWSUP)) { 768 end = vma->vm_end; 769 error = -EINVAL; 770 if (!(vma->vm_flags & VM_GROWSUP)) 771 goto out; 772 } 773 } 774 775 prev = vma_prev(&vmi); 776 if (start > vma->vm_start) 777 prev = vma; 778 779 tlb_gather_mmu(&tlb, current->mm); 780 nstart = start; 781 tmp = vma->vm_start; 782 for_each_vma_range(vmi, vma, end) { 783 unsigned long mask_off_old_flags; 784 unsigned long newflags; 785 int new_vma_pkey; 786 787 if (vma->vm_start != tmp) { 788 error = -ENOMEM; 789 break; 790 } 791 792 /* Does the application expect PROT_READ to imply PROT_EXEC */ 793 if (rier && (vma->vm_flags & VM_MAYEXEC)) 794 prot |= PROT_EXEC; 795 796 /* 797 * Each mprotect() call explicitly passes r/w/x permissions. 798 * If a permission is not passed to mprotect(), it must be 799 * cleared from the VMA. 800 */ 801 mask_off_old_flags = VM_ACCESS_FLAGS | VM_FLAGS_CLEAR; 802 803 new_vma_pkey = arch_override_mprotect_pkey(vma, prot, pkey); 804 newflags = calc_vm_prot_bits(prot, new_vma_pkey); 805 newflags |= (vma->vm_flags & ~mask_off_old_flags); 806 807 /* newflags >> 4 shift VM_MAY% in place of VM_% */ 808 if ((newflags & ~(newflags >> 4)) & VM_ACCESS_FLAGS) { 809 error = -EACCES; 810 break; 811 } 812 813 if (map_deny_write_exec(vma, newflags)) { 814 error = -EACCES; 815 break; 816 } 817 818 /* Allow architectures to sanity-check the new flags */ 819 if (!arch_validate_flags(newflags)) { 820 error = -EINVAL; 821 break; 822 } 823 824 if ((vma->vm_flags & VM_WRITE) && !(newflags & VM_WRITE)) > 825 newflags |= VM_WASWRITE; 826 827 error = security_file_mprotect(vma, reqprot, prot); 828 if (error) 829 break; 830 831 tmp = vma->vm_end; 832 if (tmp > end) 833 tmp = end; 834 835 if (vma->vm_ops && vma->vm_ops->mprotect) { 836 error = vma->vm_ops->mprotect(vma, nstart, tmp, newflags); 837 if (error) 838 break; 839 } 840 841 error = mprotect_fixup(&vmi, &tlb, vma, &prev, nstart, tmp, newflags); 842 if (error) 843 break; 844 845 tmp = vma_iter_end(&vmi); 846 nstart = tmp; 847 prot = reqprot; 848 } 849 tlb_finish_mmu(&tlb); 850 851 if (!error && tmp < end) 852 error = -ENOMEM; 853 854 out: 855 mmap_write_unlock(current->mm); 856 return error; 857 } 858 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
