loop0: detected capacity change from 0 to 16 MTD: Attempt to mount non-MTD device "/dev/loop0" ================================================================== BUG: KASAN: slab-use-after-free in test_bdev_super_fc+0x10a/0x110 fs/super.c:1244 Read of size 8 at addr ffff888042dc2058 by task syz-executor.0/10050 CPU: 0 PID: 10050 Comm: syz-executor.0 Not tainted 6.5.0-rc4-next-20230804-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 test_bdev_super_fc+0x10a/0x110 fs/super.c:1244 sget_fc+0x584/0x860 fs/super.c:574 get_tree_bdev+0x13e/0x6a0 fs/super.c:1325 cramfs_get_tree fs/cramfs/inode.c:954 [inline] cramfs_get_tree+0x40/0x50 fs/cramfs/inode.c:944 vfs_get_tree+0x88/0x350 fs/super.c:1523 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f901067e1ea Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f9011393ee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f9011393f80 RCX: 00007f901067e1ea RDX: 0000000020000040 RSI: 0000000020000100 RDI: 00007f9011393f40 RBP: 0000000020000040 R08: 00007f9011393f80 R09: 0000000000000400 R10: 0000000000000400 R11: 0000000000000202 R12: 0000000020000100 R13: 00007f9011393f40 R14: 0000000000000161 R15: 0000000020000080 Allocated by task 10031: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:599 [inline] kzalloc include/linux/slab.h:720 [inline] alloc_super+0x52/0xb40 fs/super.c:202 sget_fc+0x142/0x860 fs/super.c:580 get_tree_bdev+0x13e/0x6a0 fs/super.c:1325 cramfs_get_tree fs/cramfs/inode.c:954 [inline] cramfs_get_tree+0x40/0x50 fs/cramfs/inode.c:944 vfs_get_tree+0x88/0x350 fs/super.c:1523 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 777: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15e/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0xb8/0x2f0 mm/slub.c:3822 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2603 worker_thread+0x687/0x1110 kernel/workqueue.c:2754 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 insert_work+0x4a/0x330 kernel/workqueue.c:1559 __queue_work+0x5f5/0x1040 kernel/workqueue.c:1720 queue_work_on+0xed/0x110 kernel/workqueue.c:1750 rcu_do_batch kernel/rcu/tree.c:2139 [inline] rcu_core+0x7fb/0x1bb0 kernel/rcu/tree.c:2403 __do_softirq+0x218/0x965 kernel/softirq.c:553 Second to last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:2653 __put_super fs/super.c:345 [inline] put_super fs/super.c:309 [inline] deactivate_locked_super+0x144/0x170 fs/super.c:341 get_tree_bdev+0x4c7/0x6a0 fs/super.c:1349 cramfs_get_tree fs/cramfs/inode.c:954 [inline] cramfs_get_tree+0x40/0x50 fs/cramfs/inode.c:944 vfs_get_tree+0x88/0x350 fs/super.c:1523 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888042dc2000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 88 bytes inside of freed 4096-byte region [ffff888042dc2000, ffff888042dc3000) The buggy address belongs to the physical page: page:ffffea00010b7000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42dc0 head:ffffea00010b7000 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012842140 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 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 0x1d2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 9968, tgid 9968 (udevd), ts 606671593127, free_ts 606563452517 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1567 prep_new_page mm/page_alloc.c:1574 [inline] get_page_from_freelist+0x10d7/0x31b0 mm/page_alloc.c:3253 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4509 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2292 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab+0x24e/0x380 mm/slub.c:2017 new_slab mm/slub.c:2070 [inline] ___slab_alloc+0x8bc/0x1570 mm/slub.c:3223 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322 __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x137/0x350 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1022 [inline] __kmalloc+0x4f/0x100 mm/slab_common.c:1036 kmalloc include/linux/slab.h:603 [inline] tomoyo_realpath_from_path+0xb9/0x710 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path2_perm+0x36c/0x710 security/tomoyo/file.c:923 tomoyo_path_rename+0x102/0x1b0 security/tomoyo/tomoyo.c:299 security_path_rename+0x148/0x230 security/security.c:1814 do_renameat2+0x78b/0xdc0 fs/namei.c:4996 __do_sys_rename fs/namei.c:5055 [inline] __se_sys_rename fs/namei.c:5053 [inline] __x64_sys_rename+0x81/0xa0 fs/namei.c:5053 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 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:1158 [inline] free_unref_page_prepare+0x508/0xb90 mm/page_alloc.c:2380 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2475 __unfreeze_partials+0x21d/0x240 mm/slub.c:2655 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x18b/0x1d0 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x185/0x3f0 mm/slub.c:3523 __alloc_skb+0x287/0x330 net/core/skbuff.c:634 alloc_skb_fclone include/linux/skbuff.h:1337 [inline] tcp_stream_alloc_skb+0x34/0x560 net/ipv4/tcp.c:868 tcp_sendmsg_locked+0xf47/0x3420 net/ipv4/tcp.c:1148 tcp_sendmsg+0x2e/0x40 net/ipv4/tcp.c:1334 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:830 sock_sendmsg_nosec net/socket.c:727 [inline] sock_sendmsg+0xd9/0x180 net/socket.c:750 sock_write_iter+0x29b/0x3d0 net/socket.c:1131 call_write_iter include/linux/fs.h:1976 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x650/0xe40 fs/read_write.c:584 ksys_write+0x1f0/0x250 fs/read_write.c:637 Memory state around the buggy address: ffff888042dc1f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888042dc1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888042dc2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888042dc2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888042dc2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================