loop0: detected capacity change from 0 to 1024 ======================================================= WARNING: The mand mount option has been deprecated and and is ignored by this kernel. Remove the mand option from the mount to silence this warning. ======================================================= EXT4-fs: Ignoring removed oldalloc option EXT4-fs: Ignoring removed orlov option EXT4-fs (loop0): stripe (2) is not aligned with cluster size (16), stripe is disabled EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ================================================================== BUG: KASAN: use-after-free in ext4_ext_rm_leaf fs/ext4/extents.c:2630 [inline] BUG: KASAN: use-after-free in ext4_ext_remove_space+0x3170/0x4280 fs/ext4/extents.c:2964 Read of size 4 at addr ffff8880130184f0 by task syz.0.0/5323 CPU: 0 UID: 0 PID: 5323 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 mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 ext4_ext_rm_leaf fs/ext4/extents.c:2630 [inline] ext4_ext_remove_space+0x3170/0x4280 fs/ext4/extents.c:2964 ext4_ext_truncate+0x17e/0x2f0 fs/ext4/extents.c:4537 ext4_truncate+0xb63/0x13b0 fs/ext4/inode.c:4564 ext4_setattr+0x106e/0x1c60 fs/ext4/inode.c:5956 notify_change+0xc1a/0xf40 fs/attr.c:556 do_truncate+0x1c2/0x250 fs/open.c:68 vfs_truncate+0x4b4/0x540 fs/open.c:118 do_sys_truncate+0xf3/0x1c0 fs/open.c:142 __do_sys_truncate fs/open.c:154 [inline] __se_sys_truncate fs/open.c:152 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:152 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f589a39c799 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:00007f589b208fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f589a615fa0 RCX: 00007f589a39c799 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000200000000180 RBP: 00007f589a432c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f589a616038 R14: 00007f589a615fa0 R15: 00007ffe84d44a68 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x8 pfn:0x13018 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f0(buddy) raw: 00fff00000000000 ffffea00004c2ec8 ffffea00004c2088 0000000000000000 raw: 0000000000000008 0000000000000000 00000000f0000000 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 0x152c4a(GFP_NOFS|__GFP_HIGHMEM|__GFP_MOVABLE|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 4717, tgid 4717 (udevd), ts 32443925868, free_ts 83276010723 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2484 alloc_frozen_pages_noprof mm/mempolicy.c:2555 [inline] alloc_pages_noprof+0xa8/0x190 mm/mempolicy.c:2575 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2585 filemap_alloc_folio_noprof+0x111/0x470 mm/filemap.c:1013 ractl_alloc_folio mm/readahead.c:189 [inline] page_cache_ra_unbounded+0x39b/0xa50 mm/readahead.c:277 do_page_cache_ra mm/readahead.c:334 [inline] page_cache_ra_order+0xaf2/0xeb0 mm/readahead.c:538 filemap_readahead mm/filemap.c:2663 [inline] filemap_get_pages+0x897/0x1f10 mm/filemap.c:2709 filemap_read+0x447/0x1230 mm/filemap.c:2805 __kernel_read+0x504/0x9b0 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:480 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] ima_calc_file_hash+0x12c3/0x17f0 security/integrity/ima/ima_crypto.c:568 ima_collect_measurement+0x48b/0x930 security/integrity/ima/ima_api.c:295 process_measurement+0x12cd/0x1c80 security/integrity/ima/ima_main.c:407 page last free pid 74 tgid 74 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] free_unref_folios+0xed5/0x16d0 mm/page_alloc.c:3040 shrink_folio_list+0x2a0f/0x5290 mm/vmscan.c:1541 evict_folios+0x4795/0x5880 mm/vmscan.c:4718 try_to_shrink_lruvec+0xb62/0xfa0 mm/vmscan.c:4881 shrink_one+0x25c/0x710 mm/vmscan.c:4926 shrink_many mm/vmscan.c:4989 [inline] lru_gen_shrink_node mm/vmscan.c:5067 [inline] shrink_node+0x3197/0x3a90 mm/vmscan.c:6047 kswapd_shrink_node mm/vmscan.c:6894 [inline] balance_pgdat mm/vmscan.c:7070 [inline] kswapd+0x1742/0x2e10 mm/vmscan.c:7343 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888013018380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888013018400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888013018480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888013018500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888013018580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================