================================================================== BUG: KASAN: slab-use-after-free in string_nocheck lib/vsprintf.c:646 [inline] BUG: KASAN: slab-use-after-free in string+0x218/0x2b0 lib/vsprintf.c:728 Read of size 1 at addr ffff88802b118800 by task udevd/31022 CPU: 0 PID: 31022 Comm: udevd Not tainted 6.8.0-rc5-syzkaller-00329-gab0a97cffa0b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180 mm/kasan/report.c:601 string_nocheck lib/vsprintf.c:646 [inline] string+0x218/0x2b0 lib/vsprintf.c:728 vsnprintf+0x1101/0x1da0 lib/vsprintf.c:2824 add_uevent_var+0x1c8/0x450 lib/kobject_uevent.c:665 dev_uevent+0x3ec/0x900 drivers/base/core.c:2590 uevent_show+0x1a1/0x310 drivers/base/core.c:2661 dev_attr_show+0x55/0xc0 drivers/base/core.c:2364 sysfs_kf_seq_show+0x334/0x4c0 fs/sysfs/file.c:59 seq_read_iter+0x445/0xd60 fs/seq_file.c:230 call_read_iter include/linux/fs.h:2081 [inline] new_sync_read fs/read_write.c:395 [inline] vfs_read+0x978/0xb70 fs/read_write.c:476 ksys_read+0x1a0/0x2c0 fs/read_write.c:619 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7ff951b7cb6a Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffd3ec21968 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000055fe79af90f0 RCX: 00007ff951b7cb6a RDX: 0000000000001000 RSI: 000055fe79af3930 RDI: 0000000000000008 RBP: 000055fe79af90f0 R08: 0000000000000008 R09: 0000000000000008 R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000003fff R14: 00007ffd3ec21e48 R15: 000000000000000a Allocated by task 1888: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x1d6/0x360 mm/slub.c:4012 kmalloc include/linux/slab.h:590 [inline] raw_ioctl_init drivers/usb/gadget/legacy/raw_gadget.c:509 [inline] raw_ioctl+0x1aad/0x3ce0 drivers/usb/gadget/legacy/raw_gadget.c:1303 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:857 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 1822: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:643 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:241 __kasan_slab_free+0x34/0x70 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x14a/0x380 mm/slub.c:4409 dev_free drivers/usb/gadget/legacy/raw_gadget.c:211 [inline] kref_put+0xb5/0x7c0 include/linux/kref.h:65 raw_release+0x138/0x1e0 drivers/usb/gadget/legacy/raw_gadget.c:473 __fput+0x429/0x8a0 fs/file_table.c:376 task_work_run+0x24e/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa2c/0x2740 kernel/exit.c:871 do_group_exit+0x206/0x2c0 kernel/exit.c:1020 get_signal+0x176d/0x1850 kernel/signal.c:2893 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0xc8/0x370 kernel/entry/common.c:212 do_syscall_64+0x108/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff88802b118800 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of freed 32-byte region [ffff88802b118800, ffff88802b118820) The buggy address belongs to the physical page: page:ffffea0000ac4600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2b118 anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888014c41500 ffffea00007d0880 dead000000000005 raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5115, tgid 5115 (syz-executor.1), ts 139135030145, free_ts 139130609203 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x255/0x680 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd17/0x13e0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc+0x2e0/0x490 mm/slub.c:3994 kmalloc include/linux/slab.h:594 [inline] kzalloc include/linux/slab.h:711 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x26f/0x540 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x59e/0x5e0 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x2b7/0x740 security/tomoyo/file.c:822 tomoyo_path_rmdir+0xd0/0x110 security/tomoyo/tomoyo.c:195 security_path_rmdir+0xe1/0x140 security/security.c:1836 do_rmdir+0x2e7/0x580 fs/namei.c:4261 __do_sys_unlinkat fs/namei.c:4440 [inline] __se_sys_unlinkat fs/namei.c:4434 [inline] __x64_sys_unlinkat+0xe0/0xf0 fs/namei.c:4434 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 page last free pid 5064 tgid 5063 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 skb_free_frag include/linux/skbuff.h:3270 [inline] skb_free_head net/core/skbuff.c:996 [inline] skb_release_data+0x6a7/0x850 net/core/skbuff.c:1028 skb_release_all net/core/skbuff.c:1094 [inline] __kfree_skb+0x57/0x70 net/core/skbuff.c:1108 tcp_data_queue+0x1e1/0x6d90 tcp_rcv_established+0xf93/0x1fd0 net/ipv4/tcp_input.c:6170 tcp_v4_do_rcv+0x8dd/0xb90 net/ipv4/tcp_ipv4.c:1906 tcp_v4_rcv+0x2cba/0x35c0 net/ipv4/tcp_ipv4.c:2329 ip_protocol_deliver_rcu+0x225/0x430 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2b6/0x500 net/ipv4/ip_input.c:233 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314 ip_local_deliver net/ipv4/ip_input.c:254 [inline] dst_input include/net/dst.h:461 [inline] ip_sublist_rcv_finish+0x3be/0x4f0 net/ipv4/ip_input.c:580 ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline] ip_sublist_rcv+0x75d/0xab0 net/ipv4/ip_input.c:639 ip_list_rcv+0x42b/0x480 net/ipv4/ip_input.c:674 __netif_receive_skb_list_ptype net/core/dev.c:5577 [inline] __netif_receive_skb_list_core+0x95a/0x980 net/core/dev.c:5625 __netif_receive_skb_list net/core/dev.c:5677 [inline] netif_receive_skb_list_internal+0xa19/0xe30 net/core/dev.c:5768 Memory state around the buggy address: ffff88802b118700: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff88802b118780: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802b118800: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88802b118880: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ffff88802b118900: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================