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KASAN: slab-out-of-bounds Read in fuse_inode_eq (3)

Status: auto-obsoleted due to no activity on 2023/12/23 17:59
Subsystems: fuse
[Documentation on labels]
Reported-by: syzbot+b5033953151c11a7efb4@syzkaller.appspotmail.com
First crash: 286d, last: 269d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-out-of-bounds Read in fuse_inode_eq (2) fuse 3 611d 652d 0/27 auto-obsoleted due to no activity on 2023/02/15 01:20
upstream KASAN: slab-out-of-bounds Read in fuse_inode_eq fuse 2 995d 1025d 0/27 auto-closed as invalid on 2021/12/28 07:13
android-5-10 KASAN: slab-out-of-bounds Read in fuse_inode_eq 5 846d 854d 0/2 auto-closed as invalid on 2022/05/26 03:34

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in get_node_id fs/fuse/fuse_i.h:905 [inline]
BUG: KASAN: slab-out-of-bounds in fuse_inode_eq+0x54/0x70 fs/fuse/inode.c:368
Read of size 8 at addr ffff88803a2a9d00 by task syz-executor.2/1448

CPU: 0 PID: 1448 Comm: syz-executor.2 Not tainted 6.6.0-rc2-syzkaller-00386-g3aba70aed91f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:475
 kasan_report+0x175/0x1b0 mm/kasan/report.c:588
 get_node_id fs/fuse/fuse_i.h:905 [inline]
 fuse_inode_eq+0x54/0x70 fs/fuse/inode.c:368
 find_inode+0x16f/0x430 fs/inode.c:901
 ilookup5_nowait fs/inode.c:1456 [inline]
 ilookup5+0xa1/0x200 fs/inode.c:1485
 iget5_locked+0x37/0x270 fs/inode.c:1266
 fuse_iget+0x1cf/0x810 fs/fuse/inode.c:409
 fuse_lookup_name+0x682/0x830 fs/fuse/dir.c:395
 fuse_lookup+0x182/0x600 fs/fuse/dir.c:425
 fuse_atomic_open+0x19e/0x8a0 fs/fuse/dir.c:731
 atomic_open fs/namei.c:3358 [inline]
 lookup_open fs/namei.c:3466 [inline]
 open_last_lookups fs/namei.c:3563 [inline]
 path_openat+0x1044/0x3180 fs/namei.c:3793
 do_filp_open+0x234/0x490 fs/namei.c:3823
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1422
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_creat fs/open.c:1513 [inline]
 __se_sys_creat fs/open.c:1507 [inline]
 __x64_sys_creat+0x123/0x160 fs/open.c:1507
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbcb5c7cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbcb696b0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007fbcb5d9c050 RCX: 00007fbcb5c7cae9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200042c0
RBP: 00007fbcb5cc847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fbcb5d9c050 R15: 00007ffeca2b2e38
 </TASK>

Allocated by task 11100:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4f/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x66/0x70 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x67/0x3d0 mm/slab.h:762
 slab_alloc_node mm/slub.c:3478 [inline]
 slab_alloc mm/slub.c:3486 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3493 [inline]
 kmem_cache_alloc_lru+0x122/0x300 mm/slub.c:3509
 alloc_inode_sb include/linux/fs.h:2868 [inline]
 ntfs_alloc_inode+0x28/0x80 fs/ntfs3/super.c:546
 alloc_inode fs/inode.c:259 [inline]
 iget5_locked+0xa0/0x270 fs/inode.c:1269
 ntfs_iget5+0xc6/0x38e0 fs/ntfs3/inode.c:525
 ntfs_fill_super+0x2459/0x4c30 fs/ntfs3/super.c:1150
 get_tree_bdev+0x416/0x5b0 fs/super.c:1577
 vfs_get_tree+0x8c/0x280 fs/super.c:1750
 do_new_mount+0x28f/0xae0 fs/namespace.c:3335
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Last potentially related work creation:
 kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xad/0xc0 mm/kasan/generic.c:492
 __call_rcu_common kernel/rcu/tree.c:2653 [inline]
 call_rcu+0x167/0xa70 kernel/rcu/tree.c:2767
 ntfs_extend_init+0x42f/0x530 fs/ntfs3/fsntfs.c:272
 ntfs_fill_super+0x44d6/0x4c30 fs/ntfs3/super.c:1475
 get_tree_bdev+0x416/0x5b0 fs/super.c:1577
 vfs_get_tree+0x8c/0x280 fs/super.c:1750
 do_new_mount+0x28f/0xae0 fs/namespace.c:3335
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff88803a2a9620
 which belongs to the cache ntfs_inode_cache of size 1760
The buggy address is located 0 bytes to the right of
 allocated 1760-byte region [ffff88803a2a9620, ffff88803a2a9d00)

The buggy address belongs to the physical page:
page:ffffea0000e8aa00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88803a2ad120 pfn:0x3a2a8
head:ffffea0000e8aa00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8880214e9001
ksm flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888142ec8c80 ffffea0000e87000 dead000000000003
raw: ffff88803a2ad120 0000000080110004 00000001ffffffff ffff8880214e9001
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 10453, tgid 10452 (syz-executor.0), ts 382255940049, free_ts 363926040841
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1536
 prep_new_page mm/page_alloc.c:1543 [inline]
 get_page_from_freelist+0x31db/0x3360 mm/page_alloc.c:3170
 __alloc_pages+0x255/0x670 mm/page_alloc.c:4426
 alloc_slab_page+0x6a/0x160 mm/slub.c:1870
 allocate_slab mm/slub.c:2017 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2070
 ___slab_alloc+0xc85/0x1310 mm/slub.c:3223
 __slab_alloc mm/slub.c:3322 [inline]
 __slab_alloc_node mm/slub.c:3375 [inline]
 slab_alloc_node mm/slub.c:3468 [inline]
 slab_alloc mm/slub.c:3486 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3493 [inline]
 kmem_cache_alloc_lru+0x1bf/0x300 mm/slub.c:3509
 alloc_inode_sb include/linux/fs.h:2868 [inline]
 ntfs_alloc_inode+0x28/0x80 fs/ntfs3/super.c:546
 alloc_inode fs/inode.c:259 [inline]
 iget5_locked+0xa0/0x270 fs/inode.c:1269
 ntfs_iget5+0xc6/0x38e0 fs/ntfs3/inode.c:525
 ntfs_fill_super+0x3b3c/0x4c30 fs/ntfs3/super.c:1350
 get_tree_bdev+0x416/0x5b0 fs/super.c:1577
 vfs_get_tree+0x8c/0x280 fs/super.c:1750
 do_new_mount+0x28f/0xae0 fs/namespace.c:3335
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1136 [inline]
 free_unref_page_prepare+0x8c3/0x9f0 mm/page_alloc.c:2312
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2405
 __slab_free+0x2f6/0x390 mm/slub.c:3715
 qlink_free mm/kasan/quarantine.c:166 [inline]
 qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185
 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:292
 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x67/0x3d0 mm/slab.h:762
 slab_alloc_node mm/slub.c:3478 [inline]
 slab_alloc mm/slub.c:3486 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3493 [inline]
 kmem_cache_alloc+0x123/0x300 mm/slub.c:3502
 getname_flags+0xbc/0x4e0 fs/namei.c:140
 do_sys_openat2+0xd2/0x1d0 fs/open.c:1416
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_openat fs/open.c:1453 [inline]
 __se_sys_openat fs/open.c:1448 [inline]
 __x64_sys_openat+0x247/0x290 fs/open.c:1448
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88803a2a9c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88803a2a9c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88803a2a9d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88803a2a9d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88803a2a9e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/24 17:59 upstream 3aba70aed91f 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-out-of-bounds Read in fuse_inode_eq
2023/09/07 22:51 upstream 4a0fc73da97e 72324844 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-out-of-bounds Read in fuse_inode_eq
* Struck through repros no longer work on HEAD.