loop0: detected capacity change from 0 to 2048 EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. loop0: detected capacity change from 2048 to 1791 EXT4-fs error (device loop0): ext4_readdir:265: inode #2: block 16: comm syz.0.0: path /0/file0: bad entry in directory: directory entry overrun - offset=0, inode=2037609061, rec_len=158584, size=2048 fake=0 ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x92b/0x1ed0 fs/ext4/xattr.c:1763 Read of size 18446744073709551600 at addr ffff88801adbdeb8 by task syz.0.0/5311 CPU: 0 UID: 0 PID: 5311 Comm: syz.0.0 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 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 ext4_xattr_set_entry+0x92b/0x1ed0 fs/ext4/xattr.c:1763 ext4_xattr_ibody_set+0x262/0x710 fs/ext4/xattr.c:2275 ext4_destroy_inline_data_nolock+0x23a/0x5f0 fs/ext4/inline.c:472 ext4_destroy_inline_data+0x83/0xe0 fs/ext4/inline.c:1806 ext4_do_writepages+0x573/0x47a0 fs/ext4/inode.c:2828 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3043 do_writepages+0x338/0x560 mm/page-writeback.c:2571 filemap_writeback mm/filemap.c:387 [inline] filemap_flush_range mm/filemap.c:436 [inline] filemap_flush+0x1e1/0x2e0 mm/filemap.c:451 ext4_convert_inline_data+0x189/0x5c0 fs/ext4/inline.c:1972 ext4_page_mkwrite+0x244/0x1140 fs/ext4/inode.c:6809 do_page_mkwrite+0x147/0x310 mm/memory.c:3684 wp_page_shared mm/memory.c:4085 [inline] do_wp_page+0x1973/0x4c70 mm/memory.c:4304 handle_pte_fault mm/memory.c:6395 [inline] __handle_mm_fault mm/memory.c:6517 [inline] handle_mm_fault+0x1490/0x3080 mm/memory.c:6686 do_user_addr_fault+0x744/0x1340 arch/x86/mm/fault.c:1394 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0010:rep_movs_alternative+0x33/0xa0 arch/x86/lib/copy_user_64.S:61 Code: 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 e9 8d 64 04 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb RSP: 0018:ffffc9000eecfd48 EFLAGS: 00050212 RAX: 000000006a7f4977 RBX: 0000000000000010 RCX: 0000000000000010 RDX: 0000000000000000 RSI: ffffc9000eecfda0 RDI: 0000200000002180 RBP: ffffc9000eecfe10 R08: ffffc9000eecfdaf R09: 1ffff92001dd9fb5 R10: dffffc0000000000 R11: fffff52001dd9fb6 R12: 0000200000002190 R13: 00007ffffffff000 R14: ffffc9000eecfda0 R15: 0000200000002180 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] _inline_copy_to_user include/linux/uaccess.h:202 [inline] _copy_to_user+0x8a/0xb0 lib/usercopy.c:24 copy_to_user include/linux/uaccess.h:230 [inline] put_timespec64+0xc8/0x130 kernel/time/time.c:906 __do_sys_clock_gettime kernel/time/posix-timers.c:1154 [inline] __se_sys_clock_gettime kernel/time/posix-timers.c:1142 [inline] __x64_sys_clock_gettime+0x22a/0x290 kernel/time/posix-timers.c:1142 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: 0033:0x7f71c1b9e0d9 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:00007f71c298afe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4 RAX: ffffffffffffffda RBX: 00007f71c1e25fa0 RCX: 00007f71c1b9e0d9 RDX: 0000000000000000 RSI: 0000200000002180 RDI: 0000000000000000 RBP: 00007f71c1c35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f71c1e26038 R14: 00007f71c1e25fa0 R15: 00007ffc69a25078 The buggy address belongs to the physical page: page: refcount:3 mapcount:0 mapping:ffff88801d02d940 index:0x2 pfn:0x1adbd memcg:ffff88801229b080 aops:def_blk_aops ino:700000 dentry name(?):"" flags: 0xfff18000004214(referenced|dirty|workingset|private|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff18000004214 0000000000000000 dead000000000122 ffff88801d02d940 raw: 0000000000000002 ffff888043db9b60 00000003ffffffff ffff88801229b080 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_MOVABLE|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL), pid 5311, tgid 5310 (syz.0.0), ts 95499206343, free_ts 95494998517 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 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof+0xac/0x2a0 mm/mempolicy.c:2581 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2591 filemap_alloc_folio_noprof+0x111/0x470 mm/filemap.c:1019 __filemap_get_folio_mpol+0x402/0x1000 mm/filemap.c:2018 __filemap_get_folio include/linux/pagemap.h:761 [inline] grow_dev_folio fs/buffer.c:960 [inline] grow_buffers fs/buffer.c:1026 [inline] __getblk_slow fs/buffer.c:1044 [inline] bdev_getblk+0x1f4/0x6e0 fs/buffer.c:1439 __getblk include/linux/buffer_head.h:382 [inline] sb_getblk include/linux/buffer_head.h:388 [inline] __ext4_get_inode_loc+0x56c/0xf40 fs/ext4/inode.c:4891 ext4_get_inode_loc fs/ext4/inode.c:5019 [inline] ext4_reserve_inode_write+0x18b/0x360 fs/ext4/inode.c:6424 __ext4_mark_inode_dirty+0x13e/0x700 fs/ext4/inode.c:6602 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6639 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2709 generic_update_time fs/inode.c:2257 [inline] file_update_time_flags+0x3ee/0x4a0 fs/inode.c:2487 ext4_page_mkwrite+0x224/0x1140 fs/ext4/inode.c:6805 page last free pid 5269 tgid 5269 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:1159 shmem_truncate_range mm/shmem.c:1287 [inline] shmem_evict_inode+0x280/0xa80 mm/shmem.c:1417 evict+0x624/0xb50 fs/inode.c:825 dentry_kill+0x1b9/0x880 fs/dcache.c:826 finish_dput+0x1a/0x260 fs/dcache.c:1001 end_renaming fs/namei.c:4122 [inline] filename_renameat2+0x61b/0x9a0 fs/namei.c:6194 __do_sys_rename fs/namei.c:6236 [inline] __se_sys_rename+0x55/0x2c0 fs/namei.c:6232 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 Memory state around the buggy address: ffff88801adbdd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801adbde00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88801adbde80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88801adbdf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801adbdf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: 73 25 jae 0x27 2: 85 c9 test %ecx,%ecx 4: 74 0f je 0x15 6: 8a 06 mov (%rsi),%al 8: 88 07 mov %al,(%rdi) a: 48 ff c7 inc %rdi d: 48 ff c6 inc %rsi 10: 48 ff c9 dec %rcx 13: 75 f1 jne 0x6 15: e9 8d 64 04 00 jmp 0x464a7 1a: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 21: 00 00 00 24: 0f 1f 00 nopl (%rax) 27: 48 8b 06 mov (%rsi),%rax * 2a: 48 89 07 mov %rax,(%rdi) <-- trapping instruction 2d: 48 83 c6 08 add $0x8,%rsi 31: 48 83 c7 08 add $0x8,%rdi 35: 83 e9 08 sub $0x8,%ecx 38: 74 db je 0x15 3a: 83 f9 08 cmp $0x8,%ecx 3d: 73 e8 jae 0x27 3f: eb .byte 0xeb