hpfs: filesystem error: map_dirent: not a directory hpfs: hpfs_map_4sectors(): unaligned read hpfs: filesystem error: unable to find root dir ================================================================== BUG: KASAN: use-after-free in hpfs_bplus_lookup+0x4dc/0x860 fs/hpfs/anode.c:38 Read of size 4 at addr ffff88801261f004 by task syz.0.17/5464 CPU: 0 UID: 0 PID: 5464 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 hpfs_bplus_lookup+0x4dc/0x860 fs/hpfs/anode.c:38 hpfs_bmap+0x22a/0x4d0 fs/hpfs/file.c:54 hpfs_get_block+0xa8/0x6e0 fs/hpfs/file.c:87 do_mpage_readpage+0x822/0x1990 fs/mpage.c:222 mpage_readahead+0x3b0/0x790 fs/mpage.c:371 read_pages+0x17a/0x580 mm/readahead.c:163 page_cache_ra_unbounded+0x750/0x990 mm/readahead.c:302 filemap_get_pages+0x468/0x1dc0 mm/filemap.c:2690 filemap_read+0x3f6/0x11a0 mm/filemap.c:2800 __kernel_read+0x4cf/0x960 fs/read_write.c:530 integrity_kernel_read+0x89/0xd0 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:480 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] ima_calc_file_hash+0x85e/0x16f0 security/integrity/ima/ima_crypto.c:568 ima_collect_measurement+0x428/0x8f0 security/integrity/ima/ima_api.c:293 process_measurement+0x111e/0x1a70 security/integrity/ima/ima_main.c:406 ima_file_check+0xd9/0x130 security/integrity/ima/ima_main.c:663 security_file_post_open+0xbb/0x290 security/security.c:2652 do_open fs/namei.c:4630 [inline] path_openat+0x3456/0x3dd0 fs/namei.c:4787 do_filp_open+0x1fa/0x410 fs/namei.c:4814 do_sys_openat2+0x121/0x200 fs/open.c:1430 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1447 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc63858f7c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffea3b9ea28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fc6387e5fa0 RCX: 00007fc63858f7c9 RDX: 0000000000000000 RSI: 0000200000004280 RDI: ffffffffffffff9c RBP: 00007fc638613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc6387e5fa0 R14: 00007fc6387e5fa0 R15: 0000000000000004 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f7f43a06 pfn:0x1261f flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea000049f488 ffffea00004985c8 0000000000000000 raw: 00000007f7f43a06 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 5339, tgid 5339 (udevd), ts 101855790212, free_ts 101856737146 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x234/0x290 mm/page_alloc.c:1857 prep_new_page mm/page_alloc.c:1865 [inline] get_page_from_freelist+0x24e0/0x2580 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 folio_alloc_mpol_noprof mm/mempolicy.c:2505 [inline] vma_alloc_folio_noprof+0xe4/0x200 mm/mempolicy.c:2540 folio_prealloc+0x30/0x180 mm/memory.c:-1 alloc_anon_folio mm/memory.c:5165 [inline] do_anonymous_page mm/memory.c:5222 [inline] do_pte_missing+0x14e8/0x3330 mm/memory.c:4399 handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x1b26/0x32b0 mm/memory.c:6580 do_user_addr_fault+0x764/0x1380 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x71/0xd0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 page last free pid 5339 tgid 5339 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1406 [inline] free_unref_folios+0xdb3/0x14f0 mm/page_alloc.c:3000 folios_put_refs+0x584/0x670 mm/swap.c:1002 free_pages_and_swap_cache+0x4be/0x520 mm/swap_state.c:358 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:397 [inline] tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497 vms_clear_ptes+0x42b/0x530 mm/vma.c:1238 vms_complete_munmap_vmas+0x206/0x8a0 mm/vma.c:1280 do_vmi_align_munmap+0x364/0x440 mm/vma.c:1539 do_vmi_munmap+0x253/0x2e0 mm/vma.c:1587 __vm_munmap+0x207/0x380 mm/vma.c:3203 __do_sys_munmap mm/mmap.c:1077 [inline] __se_sys_munmap mm/mmap.c:1074 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:1074 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88801261ef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801261ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88801261f000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88801261f080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88801261f100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================