KASAN: slab-out-of-bounds Read in fuse_inode_eq (2)

Status: auto-obsoleted due to no activity on 2023/02/15 01:20
Subsystems: fuse
[Documentation on labels]
Reported-by: syzbot+938055fcae46a26e5239@syzkaller.appspotmail.com
First crash: 1457d, last: 1412d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] KASAN: slab-out-of-bounds Read in fuse_inode_eq (2) 0 (1) 2022/09/07 09:11
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-out-of-bounds Read in fuse_inode_eq fuse 17 2 1796d 1826d 0/29 auto-closed as invalid on 2021/12/28 07:13
android-5-10 KASAN: slab-out-of-bounds Read in fuse_inode_eq 17 5 1647d 1655d 0/2 auto-closed as invalid on 2022/05/26 03:34
upstream KASAN: slab-out-of-bounds Read in fuse_inode_eq (3) fuse 17 2 1070d 1083d 0/29 auto-obsoleted due to no activity on 2023/12/23 17:59

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in get_node_id fs/fuse/fuse_i.h:886 [inline]
BUG: KASAN: slab-out-of-bounds in fuse_inode_eq+0x50/0x70 fs/fuse/inode.c:341
Read of size 8 at addr ffff888079d062e0 by task syz-executor.0/14750

CPU: 0 PID: 14750 Comm: syz-executor.0 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description+0x65/0x4b0 mm/kasan/report.c:317
 print_report+0x108/0x220 mm/kasan/report.c:433
 kasan_report+0xfb/0x130 mm/kasan/report.c:495
 get_node_id fs/fuse/fuse_i.h:886 [inline]
 fuse_inode_eq+0x50/0x70 fs/fuse/inode.c:341
 find_inode+0x19c/0x4d0 fs/inode.c:915
 ilookup5_nowait fs/inode.c:1428 [inline]
 ilookup5+0x9d/0x1d0 fs/inode.c:1457
 iget5_locked+0x33/0x270 fs/inode.c:1238
 fuse_iget+0x1c3/0x800 fs/fuse/inode.c:382
 fuse_lookup_name+0x667/0x830 fs/fuse/dir.c:403
 fuse_lookup+0x17e/0x5f0 fs/fuse/dir.c:433
 fuse_atomic_open+0x1f0/0x1a70 fs/fuse/dir.c:662
 atomic_open fs/namei.c:3276 [inline]
 lookup_open fs/namei.c:3384 [inline]
 open_last_lookups fs/namei.c:3481 [inline]
 path_openat+0xf4b/0x2e00 fs/namei.c:3688
 do_filp_open+0x275/0x500 fs/namei.c:3718
 do_sys_openat2+0x13b/0x500 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_openat fs/open.c:1342 [inline]
 __se_sys_openat fs/open.c:1337 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1337
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f674d68b5a9
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f674c5dd168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f674d7ac050 RCX: 00007f674d68b5a9
RDX: 0000000000000000 RSI: 0000000020002040 RDI: ffffffffffffff9c
RBP: 00007f674d6e6580 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe754e1caf R14: 00007f674c5dd300 R15: 0000000000022000
 </TASK>

Allocated by task 29884:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:437 [inline]
 __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:470
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:727 [inline]
 slab_alloc_node mm/slub.c:3248 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3263 [inline]
 kmem_cache_alloc_lru+0x175/0x2d0 mm/slub.c:3280
 alloc_inode_sb include/linux/fs.h:3107 [inline]
 reiserfs_alloc_inode+0x23/0xc0 fs/reiserfs/super.c:642
 alloc_inode fs/inode.c:259 [inline]
 iget5_locked+0x9c/0x270 fs/inode.c:1241
 reiserfs_fill_super+0x12e7/0x2620 fs/reiserfs/super.c:2055
 mount_bdev+0x26c/0x3a0 fs/super.c:1400
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888079d05cc0
 which belongs to the cache reiser_inode_cache of size 1568
The buggy address is located 0 bytes to the right of
 1568-byte region [ffff888079d05cc0, ffff888079d062e0)

The buggy address belongs to the physical page:
page:ffffea0001e74000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x79d00
head:ffffea0001e74000 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff888026fb0c01
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff88814690fc80
raw: 0000000000000000 0000000000130013 00000001ffffffff ffff888026fb0c01
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 29441, tgid 29440 (syz-executor.5), ts 975032983045, free_ts 972352508994
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549
 alloc_slab_page+0x70/0xf0 mm/slub.c:1829
 allocate_slab+0x5e/0x520 mm/slub.c:1974
 new_slab mm/slub.c:2034 [inline]
 ___slab_alloc+0x42e/0xce0 mm/slub.c:3036
 __slab_alloc mm/slub.c:3123 [inline]
 slab_alloc_node mm/slub.c:3214 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3263 [inline]
 kmem_cache_alloc_lru+0x225/0x2d0 mm/slub.c:3280
 alloc_inode_sb include/linux/fs.h:3107 [inline]
 reiserfs_alloc_inode+0x23/0xc0 fs/reiserfs/super.c:642
 alloc_inode fs/inode.c:259 [inline]
 new_inode_pseudo+0x61/0x1d0 fs/inode.c:1018
 new_inode+0x25/0x1d0 fs/inode.c:1046
 reiserfs_mkdir+0x1bc/0x8e0 fs/reiserfs/namei.c:813
 xattr_mkdir fs/reiserfs/xattr.c:76 [inline]
 create_privroot fs/reiserfs/xattr.c:882 [inline]
 reiserfs_xattr_init+0x34b/0x730 fs/reiserfs/xattr.c:1005
 reiserfs_fill_super+0x2206/0x2620 fs/reiserfs/super.c:2177
 mount_bdev+0x26c/0x3a0 fs/super.c:1400
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1449 [inline]
 free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499
 free_unref_page_prepare mm/page_alloc.c:3380 [inline]
 free_unref_page+0x7d/0x630 mm/page_alloc.c:3476
 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:447
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:727 [inline]
 slab_alloc_node mm/slub.c:3248 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3263 [inline]
 kmem_cache_alloc+0x1a6/0x310 mm/slub.c:3273
 getname_flags+0xb8/0x4e0 fs/namei.c:139
 user_path_at_empty+0x2a/0x1a0 fs/namei.c:2875
 do_readlinkat+0x11b/0x3b0 fs/stat.c:468
 __do_sys_readlink fs/stat.c:501 [inline]
 __se_sys_readlink fs/stat.c:498 [inline]
 __x64_sys_readlink+0x7b/0x90 fs/stat.c:498
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888079d06180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888079d06200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888079d06280: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
                                                       ^
 ffff888079d06300: fc fc fc fc fc fc fc fc fc fc fc fc 00 00 00 00
 ffff888079d06380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/10/18 01:20 upstream 55be6084c8e0 754863b4 .config console log report info ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in fuse_inode_eq
2022/10/13 11:39 upstream 493ffd6605b2 adf90437 .config console log report info ci2-upstream-fs KASAN: slab-out-of-bounds Read in fuse_inode_eq
2022/09/03 02:48 linux-next e47eb90a0a9a 49e94a20 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in fuse_inode_eq
* Struck through repros no longer work on HEAD.