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REISERFS (device loop1): Using tea hash to sort names REISERFS (device loop1): Created .reiserfs_priv - reserved for xattr storage. ================================================================== BUG: KASAN: use-after-free in leaf_paste_entries+0x580/0x1110 fs/reiserfs/lbalance.c:1362 Read of size 2 at addr ffff8880570ea008 by task syz.1.248/6649 CPU: 1 PID: 6649 Comm: syz.1.248 Not tainted 6.6.95-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: <TASK> dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xac/0x230 mm/kasan/report.c:475 kasan_report+0x117/0x150 mm/kasan/report.c:588 leaf_paste_entries+0x580/0x1110 fs/reiserfs/lbalance.c:1362 leaf_copy_dir_entries+0x699/0x990 fs/reiserfs/lbalance.c:119 leaf_copy_boundary_item+0xb90/0x2180 fs/reiserfs/lbalance.c:168 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline] leaf_move_items+0x8b5/0xe90 fs/reiserfs/lbalance.c:726 leaf_shift_left+0xbd/0x450 fs/reiserfs/lbalance.c:750 balance_leaf_when_delete_left fs/reiserfs/do_balan.c:194 [inline] balance_leaf_when_delete fs/reiserfs/do_balan.c:272 [inline] balance_leaf+0x1dc1/0x10da0 fs/reiserfs/do_balan.c:1393 do_balance+0x2fe/0x940 fs/reiserfs/do_balan.c:1888 reiserfs_delete_solid_item+0x8b5/0xec0 fs/reiserfs/stree.c:1460 remove_save_link+0x25a/0x3c0 fs/reiserfs/super.c:540 reiserfs_truncate_file+0x561/0x7c0 fs/reiserfs/inode.c:2318 reiserfs_setattr+0xc0c/0x11a0 fs/reiserfs/inode.c:3392 notify_change+0xb0d/0xe10 fs/attr.c:499 do_truncate+0x19b/0x220 fs/open.c:66 vfs_truncate+0x266/0x300 fs/open.c:112 do_sys_truncate+0xe0/0x1a0 fs/open.c:135 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fefc538e929 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:00007fefc51ff038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007fefc55b5fa0 RCX: 00007fefc538e929 RDX: 0000000000000000 RSI: 00000000003a6000 RDI: 0000200000000080 RBP: 00007fefc5410b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fefc55b5fa0 R15: 00007fffc2672618 </TASK> The buggy address belongs to the physical page: page:ffffea00015c3a80 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x570ea flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000000 ffffea00016b10c8 ffff8880b8f42360 0000000000000000 raw: 0000000000000001 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 0x141cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_WRITE), pid 6649, tgid 6648 (syz.1.248), ts 116250338485, free_ts 116339215033 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554 prep_new_page mm/page_alloc.c:1561 [inline] get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457 folio_alloc+0x1e/0x30 mm/mempolicy.c:2291 filemap_alloc_folio+0xdf/0x470 mm/filemap.c:1004 __filemap_get_folio+0x3ee/0xbc0 mm/filemap.c:1962 pagecache_get_page+0x2a/0x250 mm/folio-compat.c:99 reiserfs_write_begin+0x54/0x4c0 fs/reiserfs/inode.c:2755 generic_cont_expand_simple+0x13a/0x200 fs/buffer.c:2482 reiserfs_setattr+0x58f/0x11a0 fs/reiserfs/inode.c:3302 notify_change+0xb0d/0xe10 fs/attr.c:499 do_truncate+0x19b/0x220 fs/open.c:66 vfs_truncate+0x266/0x300 fs/open.c:112 do_sys_truncate+0xe0/0x1a0 fs/open.c:135 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 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:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2475 release_pages+0x1fa0/0x2220 mm/swap.c:1022 __folio_batch_release+0x71/0xe0 mm/swap.c:1042 folio_batch_release include/linux/pagevec.h:83 [inline] truncate_inode_pages_range+0x358/0xf00 mm/truncate.c:371 truncate_inode_pages mm/truncate.c:448 [inline] truncate_pagecache mm/truncate.c:741 [inline] truncate_setsize+0xbd/0xe0 mm/truncate.c:766 reiserfs_setattr+0xbff/0x11a0 fs/reiserfs/inode.c:3391 notify_change+0xb0d/0xe10 fs/attr.c:499 do_truncate+0x19b/0x220 fs/open.c:66 vfs_truncate+0x266/0x300 fs/open.c:112 do_sys_truncate+0xe0/0x1a0 fs/open.c:135 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff8880570e9f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8880570e9f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8880570ea000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8880570ea080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8880570ea100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/07/05 10:19 | linux-6.6.y | 3f5b4c104b7d | 4f67c4ae | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-6-6-kasan | KASAN: use-after-free Read in leaf_paste_entries |