loop0: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-out-of-bounds in bch2_dev_journal_init+0x7a1/0xb20 fs/bcachefs/journal.c:1344 Write of size 8 at addr ffff8880399af830 by task syz.0.0/5120 CPU: 0 UID: 0 PID: 5120 Comm: syz.0.0 Not tainted 6.11.0-rc3-syzkaller-00338-gc3f2d783a459 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 bch2_dev_journal_init+0x7a1/0xb20 fs/bcachefs/journal.c:1344 __bch2_dev_attach_bdev+0x217/0x340 fs/bcachefs/super.c:1390 bch2_dev_attach_bdev+0x2a8/0x6f0 fs/bcachefs/super.c:1420 bch2_fs_open+0x97c/0xdf0 fs/bcachefs/super.c:2122 bch2_fs_get_tree+0x731/0x1700 fs/bcachefs/fs.c:1933 vfs_get_tree+0x90/0x2a0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3472 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f21d537b0ba Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 7e 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:00007f21d61b0e68 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f21d61b0ef0 RCX: 00007f21d537b0ba RDX: 00000000200058c0 RSI: 0000000020005900 RDI: 00007f21d61b0eb0 RBP: 00000000200058c0 R08: 00007f21d61b0ef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020005900 R13: 00007f21d61b0eb0 R14: 00000000000058ad R15: 0000000020005940 Allocated by task 5120: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4158 [inline] __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4170 kmalloc_noprof include/linux/slab.h:685 [inline] kmalloc_array_noprof include/linux/slab.h:726 [inline] bch2_dev_journal_init+0x647/0xb20 fs/bcachefs/journal.c:1334 __bch2_dev_attach_bdev+0x217/0x340 fs/bcachefs/super.c:1390 bch2_dev_attach_bdev+0x2a8/0x6f0 fs/bcachefs/super.c:1420 bch2_fs_open+0x97c/0xdf0 fs/bcachefs/super.c:2122 bch2_fs_get_tree+0x731/0x1700 fs/bcachefs/fs.c:1933 vfs_get_tree+0x90/0x2a0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3472 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880399af800 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes to the right of allocated 48-byte region [ffff8880399af800, ffff8880399af830) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x399af ksm flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 04fff00000000000 ffff8880158418c0 ffffea0000d90e80 dead000000000003 raw: 0000000000000000 0000000080200020 00000001fdffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 4821, tgid 4821 (rm), ts 48209169341, free_ts 48191663352 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2321 allocate_slab+0x5a/0x2f0 mm/slub.c:2484 new_slab mm/slub.c:2537 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 __slab_alloc+0x58/0xa0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_noprof+0x25a/0x400 mm/slub.c:4170 kmalloc_noprof include/linux/slab.h:685 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x26f/0x540 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x59e/0x5e0 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x255/0x500 security/tomoyo/file.c:771 security_file_open+0x6a/0x750 security/security.c:2988 do_dentry_open+0x38e/0x1440 fs/open.c:946 vfs_open+0x3e/0x330 fs/open.c:1089 do_open fs/namei.c:3727 [inline] path_openat+0x2b3e/0x3470 fs/namei.c:3886 do_filp_open+0x235/0x490 fs/namei.c:3913 page last free pid 4821 tgid 4821 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_folios+0x103a/0x1b00 mm/page_alloc.c:2660 folios_put_refs+0x76e/0x860 mm/swap.c:1039 free_pages_and_swap_cache+0x2ea/0x690 mm/swap_state.c:332 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 exit_mmap+0x44f/0xc80 mm/mmap.c:3425 __mmput+0x115/0x390 kernel/fork.c:1345 exec_mmap+0x680/0x710 fs/exec.c:1089 begin_new_exec+0x12c6/0x2050 fs/exec.c:1355 load_elf_binary+0x969/0x2680 fs/binfmt_elf.c:996 search_binary_handler fs/exec.c:1827 [inline] exec_binprm fs/exec.c:1869 [inline] bprm_execve+0xaf8/0x1770 fs/exec.c:1920 do_execveat_common+0x55f/0x6f0 fs/exec.c:2027 do_execve fs/exec.c:2101 [inline] __do_sys_execve fs/exec.c:2177 [inline] __se_sys_execve fs/exec.c:2172 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2172 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880399af700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880399af780: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc >ffff8880399af800: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff8880399af880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880399af900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 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