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+0x4e1/0x870 fs/hpfs/anode.c:38 Read of size 4 at addr ffff888046d5e004 by task syz.0.17/5894 CPU: 0 UID: 0 PID: 5894 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 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 hpfs_bplus_lookup+0x4e1/0x870 fs/hpfs/anode.c:38 hpfs_bmap+0x254/0x4b0 fs/hpfs/file.c:54 hpfs_get_block+0xa8/0x6e0 fs/hpfs/file.c:87 do_mpage_readpage+0x794/0x1b40 fs/mpage.c:221 mpage_readahead+0x3e7/0x800 fs/mpage.c:370 read_pages+0x193/0x5a0 mm/readahead.c:174 page_cache_ra_unbounded+0x754/0x9d0 mm/readahead.c:315 do_page_cache_ra mm/readahead.c:348 [inline] page_cache_ra_order+0xb47/0xee0 mm/readahead.c:558 filemap_get_pages+0x4a9/0x1ec0 mm/filemap.c:2704 filemap_read+0x426/0x11e0 mm/filemap.c:2814 __kernel_read+0x4ca/0x960 fs/read_write.c:532 integrity_kernel_read+0x89/0xd0 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:222 [inline] ima_calc_file_hash+0x451/0x890 security/integrity/ima/ima_crypto.c:280 ima_collect_measurement+0x51b/0xa00 security/integrity/ima/ima_api.c:300 process_measurement+0x1272/0x1c10 security/integrity/ima/ima_main.c:425 ima_file_check+0xe1/0x130 security/integrity/ima/ima_main.c:685 security_file_post_open+0xb3/0x260 security/security.c:2755 do_open fs/namei.c:4702 [inline] path_openat+0x2e90/0x3830 fs/namei.c:4859 do_file_open+0x23e/0x4a0 fs/namei.c:4888 do_sys_openat2+0x115/0x200 fs/open.c:1368 do_sys_open fs/open.c:1374 [inline] __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1385 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f181b39af39 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f181c1a4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f181b605fa0 RCX: 00007f181b39af39 RDX: 0000000000000000 RSI: 0000200000004280 RDI: ffffffffffffff9c RBP: 00007f181b42fee0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f181b606038 R14: 00007f181b605fa0 R15: 00007fff411cf428 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x68a pfn:0x46d5e flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 ffffea00011b5708 ffffea00011b57c8 0000000000000000 raw: 000000000000068a 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 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 5894, tgid 5893 (syz.0.17), ts 189550142114, free_ts 190081979379 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304 alloc_pages_mpol+0x212/0x380 mm/mempolicy.c:2490 folio_alloc_mpol_noprof+0x39/0x160 mm/mempolicy.c:2509 shmem_alloc_folio mm/shmem.c:1907 [inline] shmem_alloc_and_add_folio+0x43e/0xf60 mm/shmem.c:1949 shmem_get_folio_gfp+0x5da/0x16d0 mm/shmem.c:2502 shmem_get_folio mm/shmem.c:2608 [inline] shmem_write_begin+0x16c/0x330 mm/shmem.c:3239 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4358 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3414 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5686 tgid 5686 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] free_unref_folios+0xd84/0x14a0 mm/page_alloc.c:3011 folios_put_refs+0x9e9/0xb30 mm/swap.c:1057 folio_batch_release include/linux/folio_batch.h:101 [inline] shmem_undo_range+0x4e6/0x15d0 mm/shmem.c:1149 shmem_truncate_range mm/shmem.c:1277 [inline] shmem_evict_inode+0x280/0xa80 mm/shmem.c:1407 evict+0x624/0xb50 fs/inode.c:825 dentry_kill+0x1b9/0x880 fs/dcache.c:826 finish_dput+0x1a/0x260 fs/dcache.c:1001 __fput+0x675/0xa50 fs/file_table.c:520 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x1fa/0x730 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888046d5df00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888046d5df80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888046d5e000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888046d5e080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888046d5e100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 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