hpfs: code page support is disabled hpfs: hpfs_map_sector(): read error hpfs: hpfs_map_sector(): read error hpfs: hpfs_map_sector(): read error ================================================================== BUG: KASAN: out-of-bounds in strcmp+0x6b/0xb0 lib/string.c:361 Read of size 1 at addr ffff888054550003 by task syz.0.353/5741 CPU: 1 PID: 5741 Comm: syz.0.353 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 strcmp+0x6b/0xb0 lib/string.c:361 hpfs_get_ea+0x111/0xc80 fs/hpfs/ea.c:139 hpfs_read_inode+0x75f/0x1000 fs/hpfs/inode.c:89 hpfs_fill_super+0x12d1/0x1eb0 fs/hpfs/super.c:712 mount_bdev+0x287/0x3c0 fs/super.c:1443 legacy_get_tree+0xe6/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5e4079076a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f5e41706e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f5e41706ef0 RCX: 00007f5e4079076a RDX: 000020000000a000 RSI: 0000200000009ec0 RDI: 00007f5e41706eb0 RBP: 000020000000a000 R08: 00007f5e41706ef0 R09: 0000000003200041 R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000009ec0 R13: 00007f5e41706eb0 R14: 0000000000009e15 R15: 0000200000000040 The buggy address belongs to the physical page: page:ffffea0001515400 refcount:1 mapcount:0 mapping:ffff888077806218 index:0xc95 pfn:0x54550 memcg:ffff888079fc8000 aops:shmem_aops ino:79 dentry name(?):"memfd:syzkaller" flags: 0xfff6000008001e(referenced|uptodate|dirty|lru|swapbacked|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff6000008001e ffffea00014a27c8 ffffea0001515448 ffff888077806218 raw: 0000000000000c95 0000000000000000 00000001ffffffff ffff888079fc8000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 5737, tgid 5733 (syz.1.351), ts 284247280666, free_ts 284197042927 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614 __folio_alloc+0xe/0x30 mm/page_alloc.c:5646 vma_alloc_folio+0x4a3/0x900 mm/mempolicy.c:2243 shmem_alloc_folio mm/shmem.c:1589 [inline] shmem_alloc_and_acct_folio+0x42e/0xb60 mm/shmem.c:1613 shmem_get_folio_gfp+0x1361/0x3400 mm/shmem.c:1941 shmem_get_folio mm/shmem.c:2072 [inline] shmem_write_begin+0xee/0x3f0 mm/shmem.c:2556 generic_perform_write+0x2db/0x560 mm/filemap.c:3846 __generic_file_write_iter+0x172/0x430 mm/filemap.c:3974 generic_file_write_iter+0xab/0x2e0 mm/filemap.c:4006 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x44c/0x960 fs/read_write.c:584 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3525 release_pages+0x1f92/0x2200 mm/swap.c:1035 __pagevec_release+0x6d/0xe0 mm/swap.c:1055 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] shmem_undo_range+0x75b/0x2050 mm/shmem.c:946 shmem_truncate_range mm/shmem.c:1062 [inline] shmem_evict_inode+0x248/0xa40 mm/shmem.c:1171 evict+0x485/0x870 fs/inode.c:705 __dentry_kill+0x431/0x650 fs/dcache.c:611 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xfa/0x1d0 fs/dcache.c:918 __fput+0x5e0/0x920 fs/file_table.c:328 task_work_run+0x1ca/0x250 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x93e/0x2400 kernel/exit.c:880 do_group_exit+0x217/0x2d0 kernel/exit.c:1022 get_signal+0x1272/0x1350 kernel/signal.c:2871 arch_do_signal_or_restart+0xb7/0x1240 arch/x86/kernel/signal.c:871 Memory state around the buggy address: ffff88805454ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805454ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888054550000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888054550080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888054550100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================