syzbot


KASAN: slab-out-of-bounds Read in fuse_inode_eq

Status: auto-closed as invalid on 2022/05/26 03:34
Reported-by: syzbot+43081a77645c97c39af2@syzkaller.appspotmail.com
First crash: 827d, last: 819d
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 584d 625d 0/26 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 968d 998d 0/26 auto-closed as invalid on 2021/12/28 07:13
upstream KASAN: slab-out-of-bounds Read in fuse_inode_eq (3) fuse 2 243d 255d 0/26 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:874 [inline]
BUG: KASAN: slab-out-of-bounds in fuse_inode_eq+0x54/0x80 fs/fuse/inode.c:295
Read of size 8 at addr ffff888132258ad8 by task syz-executor.5/5402

CPU: 1 PID: 5402 Comm: syz-executor.5 Not tainted 5.10.102-syzkaller-00166-gcbfab5c59cf6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x8d/0x3d0 mm/kasan/report.c:233
 __kasan_report+0x142/0x220 mm/kasan/report.c:419
 kasan_report+0x51/0x70 mm/kasan/report.c:436
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
 get_node_id fs/fuse/fuse_i.h:874 [inline]
 fuse_inode_eq+0x54/0x80 fs/fuse/inode.c:295
 find_inode+0x19c/0x4c0 fs/inode.c:827
 ilookup5_nowait fs/inode.c:1337 [inline]
 ilookup5+0x90/0x1a0 fs/inode.c:1366
 iget5_locked+0x36/0x3c0 fs/inode.c:1147
 fuse_iget+0x29a/0x7d0 fs/fuse/inode.c:336
 fuse_get_root_inode fs/fuse/inode.c:766 [inline]
 fuse_fill_super_common+0x9e9/0xf90 fs/fuse/inode.c:1404
 fuse_fill_super+0x280/0x3f0 fs/fuse/inode.c:1480
 vfs_get_super fs/super.c:1191 [inline]
 get_tree_nodev+0xb2/0x160 fs/super.c:1221
 fuse_get_tree+0x8f/0xd0 fs/fuse/inode.c:1514
 vfs_get_tree+0x89/0x270 fs/super.c:1549
 do_new_mount fs/namespace.c:2899 [inline]
 path_mount+0x1975/0x2ab0 fs/namespace.c:3229
 do_mount fs/namespace.c:3242 [inline]
 __do_sys_mount fs/namespace.c:3450 [inline]
 __se_sys_mount+0x2f7/0x3b0 fs/namespace.c:3427
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3427
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f608e610059
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:00007f608d786168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f608e722f60 RCX: 00007f608e610059
RDX: 0000000020002100 RSI: 00000000200042c0 RDI: 0000000000000000
RBP: 00007f608e66a08d R08: 0000000020004300 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff7a11a14f R14: 00007f608d786300 R15: 0000000000022000

Allocated by task 3045:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:428 [inline]
 ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:507
 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:516
 kasan_kmalloc include/linux/kasan.h:269 [inline]
 kmem_cache_alloc_trace+0x210/0x3a0 mm/slub.c:2981
 kmalloc include/linux/slab.h:552 [inline]
 kzalloc include/linux/slab.h:664 [inline]
 alloc_inode+0x47/0x70 fs/incfs/vfs.c:1550
 alloc_inode fs/inode.c:234 [inline]
 iget5_locked+0xae/0x3c0 fs/inode.c:1150
 fetch_regular_inode+0x22f/0x300 fs/incfs/vfs.c:377
 incfs_mount_fs+0x532/0x950 fs/incfs/vfs.c:1841
 legacy_get_tree+0xf0/0x190 fs/fs_context.c:592
 vfs_get_tree+0x89/0x270 fs/super.c:1549
 do_new_mount fs/namespace.c:2899 [inline]
 path_mount+0x1975/0x2ab0 fs/namespace.c:3229
 do_mount fs/namespace.c:3242 [inline]
 __do_sys_mount fs/namespace.c:3450 [inline]
 __se_sys_mount+0x2f7/0x3b0 fs/namespace.c:3427
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3427
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888132258800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 728 bytes inside of
 1024-byte region [ffff888132258800, ffff888132258c00)
The buggy address belongs to the page:
page:ffffea0004c89600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x132258
head:ffffea0004c89600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff888100042f00
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 2232, ts 57851795903, free_ts 57534612404
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2385 [inline]
 prep_new_page mm/page_alloc.c:2391 [inline]
 get_page_from_freelist+0xa74/0xa90 mm/page_alloc.c:4063
 __alloc_pages_nodemask+0x3c8/0x820 mm/page_alloc.c:5107
 alloc_slab_page mm/slub.c:1813 [inline]
 allocate_slab+0x6b/0x350 mm/slub.c:1815
 new_slab mm/slub.c:1876 [inline]
 new_slab_objects mm/slub.c:2635 [inline]
 ___slab_alloc+0x143/0x2f0 mm/slub.c:2798
 __slab_alloc mm/slub.c:2838 [inline]
 slab_alloc_node mm/slub.c:2920 [inline]
 slab_alloc mm/slub.c:2962 [inline]
 __kmalloc_track_caller+0x299/0x3b0 mm/slub.c:4543
 __kmalloc_reserve net/core/skbuff.c:143 [inline]
 __alloc_skb+0xb7/0x580 net/core/skbuff.c:211
 alloc_skb_fclone include/linux/skbuff.h:1151 [inline]
 sk_stream_alloc_skb+0x1e9/0xb50 net/ipv4/tcp.c:890
 tcp_sendmsg_locked+0xcda/0x4290 net/ipv4/tcp.c:1298
 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1450
 inet6_sendmsg+0xa1/0xc0 net/ipv6/af_inet6.c:640
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 __sys_sendto+0x541/0x700 net/socket.c:1982
 __do_sys_sendto net/socket.c:1994 [inline]
 __se_sys_sendto net/socket.c:1990 [inline]
 __x64_sys_sendto+0xe5/0x100 net/socket.c:1990
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1331 [inline]
 __free_pages_ok+0xbe7/0xc20 mm/page_alloc.c:1611
 free_compound_page+0x72/0x90 mm/page_alloc.c:716
 destroy_compound_page include/linux/mm.h:957 [inline]
 __put_compound_page mm/swap.c:115 [inline]
 __put_page+0x114/0x150 mm/swap.c:131
 put_page include/linux/mm.h:1253 [inline]
 __skb_frag_unref include/linux/skbuff.h:3042 [inline]
 skb_release_data+0x20d/0x750 net/core/skbuff.c:619
 skb_release_all net/core/skbuff.c:680 [inline]
 __kfree_skb+0x59/0x1c0 net/core/skbuff.c:694
 sk_wmem_free_skb+0x126/0x690 include/net/sock.h:1560
 tcp_write_queue_purge+0x145/0x410 net/ipv4/tcp.c:2696
 tcp_v4_destroy_sock+0x106/0x370 net/ipv4/tcp_ipv4.c:2224
 tcp_v6_destroy_sock+0x15/0x20 net/ipv6/tcp_ipv6.c:1939
 inet_csk_destroy_sock+0x15b/0x3c0 net/ipv4/inet_connection_sock.c:887
 tcp_close+0xdd4/0x1140 net/ipv4/tcp.c:2651
 inet_release+0x17e/0x210 net/ipv4/af_inet.c:431
 inet6_release+0x57/0x70 net/ipv6/af_inet6.c:477
 __sock_release net/socket.c:597 [inline]
 sock_close+0xdb/0x260 net/socket.c:1267
 __fput+0x348/0x7d0 fs/file_table.c:281
 ____fput+0x15/0x20 fs/file_table.c:314

Memory state around the buggy address:
 ffff888132258980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888132258a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888132258a80: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
                                                    ^
 ffff888132258b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888132258b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/02/25 03:25 android12-5.10-lts cbfab5c59cf6 7c337266 .config console log report info ci2-android-5-10 KASAN: slab-out-of-bounds Read in fuse_inode_eq
2022/02/24 13:26 android12-5.10-lts cbfab5c59cf6 b28851a4 .config console log report info ci2-android-5-10 KASAN: slab-out-of-bounds Read in fuse_inode_eq
2022/02/24 12:49 android12-5.10-lts cbfab5c59cf6 6e821dbf .config console log report info ci2-android-5-10 KASAN: slab-out-of-bounds Read in fuse_inode_eq
2022/02/24 12:39 android12-5.10-lts cbfab5c59cf6 6e821dbf .config console log report info ci2-android-5-10 KASAN: slab-out-of-bounds Read in fuse_inode_eq
2022/02/17 12:49 android12-5.10-lts c194212a0332 2bea8a27 .config console log report info ci2-android-5-10 KASAN: slab-out-of-bounds Read in fuse_inode_eq
* Struck through repros no longer work on HEAD.