Hello, syzbot found the following issue on: HEAD commit: 85a2dd7d7c81 Add linux-next specific files for 20241125 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=10b52778580000 kernel config: https://syzkaller.appspot.com/x/.config?x=45719eec4c74e6ba dashboard link: https://syzkaller.appspot.com/bug?extid=8d1206605b05ca9a0e6a compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b46530580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1578dee8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5422dd6ada68/disk-85a2dd7d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3a382ed71d3a/vmlinux-85a2dd7d.xz kernel image: https://storage.googleapis.com/syzbot-assets/9b4d03eb0da3/bzImage-85a2dd7d.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/29b16c7eaa78/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8d1206605b05ca9a0e6a@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: slab-out-of-bounds in ovl_upperdentry_dereference fs/overlayfs/ovl_entry.h:195 [inline] BUG: KASAN: slab-out-of-bounds in ovl_i_dentry_upper fs/overlayfs/util.c:366 [inline] BUG: KASAN: slab-out-of-bounds in ovl_inode_upper+0x36/0x80 fs/overlayfs/util.c:386 Read of size 8 at addr ffff88807df938e0 by task syz-executor150/5827 CPU: 0 UID: 0 PID: 5827 Comm: syz-executor150 Not tainted 6.12.0-next-20241125-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <TASK> __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:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 ovl_upperdentry_dereference fs/overlayfs/ovl_entry.h:195 [inline] ovl_i_dentry_upper fs/overlayfs/util.c:366 [inline] ovl_inode_upper+0x36/0x80 fs/overlayfs/util.c:386 ovl_file_accessed+0x7e/0x370 fs/overlayfs/file.c:307 backing_file_mmap+0x1f8/0x260 fs/backing-file.c:345 ovl_mmap+0x1c9/0x220 fs/overlayfs/file.c:487 call_mmap include/linux/fs.h:2183 [inline] mmap_file mm/internal.h:124 [inline] __mmap_new_file_vma mm/vma.c:2291 [inline] __mmap_new_vma mm/vma.c:2355 [inline] __mmap_region+0x2204/0x2cd0 mm/vma.c:2456 mmap_region+0x1d0/0x2c0 mm/mmap.c:1347 do_mmap+0x8f0/0x1000 mm/mmap.c:496 vm_mmap_pgoff+0x214/0x430 mm/util.c:580 ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:542 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: 0033:0x7fb229019739 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffdd8656a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fb229019739 RDX: 0000000000000000 RSI: 0000000000004000 RDI: 0000000020ffc000 RBP: 00007fb22908d610 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000012 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fffdd865878 R14: 0000000000000001 R15: 0000000000000001 </TASK> Allocated by task 5827: 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:4104 [inline] slab_alloc_node mm/slub.c:4153 [inline] kmem_cache_alloc_lru_noprof+0x1dd/0x390 mm/slub.c:4172 nilfs_alloc_inode+0x2e/0x110 fs/nilfs2/super.c:158 alloc_inode+0x65/0x1a0 fs/inode.c:336 iget5_locked+0x4a/0xa0 fs/inode.c:1404 nilfs_iget_locked fs/nilfs2/inode.c:535 [inline] nilfs_iget+0x130/0x810 fs/nilfs2/inode.c:544 nilfs_lookup+0x198/0x210 fs/nilfs2/namei.c:69 __lookup_slow+0x28c/0x3f0 fs/namei.c:1791 lookup_slow fs/namei.c:1808 [inline] lookup_one_unlocked+0x1a4/0x290 fs/namei.c:2966 ovl_lookup_positive_unlocked fs/overlayfs/namei.c:210 [inline] ovl_lookup_single+0x200/0xbd0 fs/overlayfs/namei.c:240 ovl_lookup_layer+0x417/0x510 fs/overlayfs/namei.c:333 ovl_lookup+0xcf7/0x2a60 fs/overlayfs/namei.c:1124 lookup_open fs/namei.c:3627 [inline] open_last_lookups fs/namei.c:3748 [inline] path_openat+0x11a7/0x3590 fs/namei.c:3984 do_filp_open+0x27f/0x4e0 fs/namei.c:4014 do_sys_openat2+0x13e/0x1d0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_open fs/open.c:1425 [inline] __se_sys_open fs/open.c:1421 [inline] __x64_sys_open+0x225/0x270 fs/open.c:1421 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 ffff88807df93300 which belongs to the cache nilfs2_inode_cache of size 1504 The buggy address is located 0 bytes to the right of allocated 1504-byte region [ffff88807df93300, ffff88807df938e0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7df90 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801f711140 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080140014 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801f711140 dead000000000122 0000000000000000 head: 0000000000000000 0000000080140014 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea0001f7e401 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 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_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 5827, tgid 5827 (syz-executor150), ts 58768101635, free_ts 15530782696 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0x3725/0x3870 mm/page_alloc.c:3510 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4787 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x140 mm/slub.c:2408 allocate_slab+0x5a/0x2f0 mm/slub.c:2574 new_slab mm/slub.c:2627 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3815 __slab_alloc+0x58/0xa0 mm/slub.c:3905 __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] kmem_cache_alloc_lru_noprof+0x26c/0x390 mm/slub.c:4172 nilfs_alloc_inode+0x2e/0x110 fs/nilfs2/super.c:158 alloc_inode+0x65/0x1a0 fs/inode.c:336 iget5_locked+0x4a/0xa0 fs/inode.c:1404 nilfs_iget_locked+0x113/0x160 fs/nilfs2/inode.c:535 nilfs_dat_read+0xc3/0x320 fs/nilfs2/dat.c:511 nilfs_load_super_root fs/nilfs2/the_nilfs.c:118 [inline] load_nilfs+0x579/0x1090 fs/nilfs2/the_nilfs.c:299 nilfs_fill_super+0x31e/0x720 fs/nilfs2/super.c:1067 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0xdf9/0x1140 mm/page_alloc.c:2693 free_contig_range+0x152/0x550 mm/page_alloc.c:6666 destroy_args+0x92/0x910 mm/debug_vm_pgtable.c:1017 debug_vm_pgtable+0x4be/0x550 mm/debug_vm_pgtable.c:1397 do_one_initcall+0x248/0x880 init/main.c:1266 do_initcall_level+0x157/0x210 init/main.c:1328 do_initcalls+0x3f/0x80 init/main.c:1344 kernel_init_freeable+0x435/0x5d0 init/main.c:1577 kernel_init+0x1d/0x2b0 init/main.c:1466 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff88807df93780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807df93800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807df93880: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ^ ffff88807df93900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807df93980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
