================================================================== BUG: KASAN: slab-out-of-bounds in jfs_readdir+0x1df9/0x4010 fs/jfs/jfs_dtree.c:2919 Read of size 4 at addr ffff88807a9dadac by task syz.5.281/8477 CPU: 1 UID: 0 PID: 8477 Comm: syz.5.281 Not tainted 6.15.0-rc3-syzkaller-00032-ga79be02bba5c #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 jfs_readdir+0x1df9/0x4010 fs/jfs/jfs_dtree.c:2919 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65 iterate_dir+0x5a9/0x760 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:403 [inline] __se_sys_getdents64+0x1e4/0x4c0 fs/readdir.c:389 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f399bb8e969 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:00007f399ca9f038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007f399bdb6080 RCX: 00007f399bb8e969 RDX: 0000000000001000 RSI: 0000200000000f80 RDI: 0000000000000006 RBP: 00007f399bc10ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f399bdb6080 R15: 00007ffcdf04dc68 Allocated by task 8455: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] kmem_cache_alloc_lru_noprof+0x1e5/0x390 mm/slub.c:4229 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x69/0x1b0 fs/inode.c:346 iget_locked+0xf1/0x570 fs/inode.c:1439 jfs_iget+0x23/0x3e0 fs/jfs/inode.c:29 jfs_lookup+0x239/0x440 fs/jfs/namei.c:1469 __lookup_slow+0x2b1/0x400 fs/namei.c:1817 lookup_slow+0x53/0x70 fs/namei.c:1834 walk_component fs/namei.c:2138 [inline] link_path_walk+0x969/0xeb0 fs/namei.c:2503 path_parentat fs/namei.c:2707 [inline] __filename_parentat+0x2b9/0x780 fs/namei.c:2731 filename_parentat fs/namei.c:2749 [inline] do_renameat2+0x3d6/0x1410 fs/namei.c:5193 __do_sys_renameat2 fs/namei.c:5304 [inline] __se_sys_renameat2 fs/namei.c:5301 [inline] __x64_sys_renameat2+0xce/0xe0 fs/namei.c:5301 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807a9da4e0 which belongs to the cache jfs_ip of size 2232 The buggy address is located 20 bytes to the right of allocated 2232-byte region [ffff88807a9da4e0, ffff88807a9dad98) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7a9d8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888031d9a501 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801e765000 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff888031d9a501 head: 00fff00000000040 ffff88801e765000 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000000f5000000 ffff888031d9a501 head: 00fff00000000003 ffffea0001ea7601 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6229, tgid 6228 (syz.1.53), ts 112682728600, free_ts 101017868719 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x360d/0x37b0 mm/page_alloc.c:3688 __alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4970 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2468 [inline] allocate_slab+0x8f/0x3b0 mm/slub.c:2632 new_slab mm/slub.c:2686 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3872 __slab_alloc+0x58/0xa0 mm/slub.c:3962 __slab_alloc_node mm/slub.c:4037 [inline] slab_alloc_node mm/slub.c:4198 [inline] kmem_cache_alloc_lru_noprof+0x274/0x390 mm/slub.c:4229 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x69/0x1b0 fs/inode.c:346 new_inode+0x22/0x180 fs/inode.c:1145 ialloc+0x4c/0x8c0 fs/jfs/jfs_inode.c:48 jfs_mkdir+0x1c7/0xbb0 fs/jfs/namei.c:225 vfs_mkdir+0x2f9/0x500 fs/namei.c:4359 do_mkdirat+0x273/0x3f0 fs/namei.c:4392 __do_sys_mkdir fs/namei.c:4414 [inline] __se_sys_mkdir fs/namei.c:4412 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4412 page last free pid 6015 tgid 6015 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0xddf/0x10a0 mm/page_alloc.c:2725 discard_slab mm/slub.c:2730 [inline] __put_partials+0x160/0x1c0 mm/slub.c:3199 put_cpu_partial+0x17e/0x250 mm/slub.c:3274 __slab_free+0x294/0x390 mm/slub.c:4526 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] __do_kmalloc_node mm/slub.c:4340 [inline] __kmalloc_noprof+0x238/0x4d0 mm/slub.c:4353 kmalloc_noprof include/linux/slab.h:909 [inline] tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x25a/0x4f0 security/tomoyo/file.c:771 security_file_open+0xac/0x250 security/security.c:3114 do_dentry_open+0x320/0x1960 fs/open.c:933 vfs_open+0x3b/0x370 fs/open.c:1086 do_open fs/namei.c:3880 [inline] path_openat+0x2caf/0x35d0 fs/namei.c:4039 do_filp_open+0x284/0x4e0 fs/namei.c:4066 do_sys_openat2+0x12b/0x1d0 fs/open.c:1429 Memory state around the buggy address: ffff88807a9dac80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807a9dad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807a9dad80: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807a9dae00: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807a9dae80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================