syzbot has found a reproducer for the following issue on: HEAD commit: 99d99825fc07 Merge tag 'nfs-for-6.6-1' of git://git.linux-.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1636e913a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=988789167afa40d5 dashboard link: https://syzkaller.appspot.com/bug?extid=dec4d528fb7a7c5d8ce3 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12e9ba2fa80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=111affcba80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e43170401ca7/disk-99d99825.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c2be4288f38f/vmlinux-99d99825.xz kernel image: https://storage.googleapis.com/syzbot-assets/8a6478588fd9/bzImage-99d99825.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+dec4d528fb7a7c5d8ce3@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:1375 [inline] BUG: KASAN: slab-use-after-free in hci_conn_drop include/net/bluetooth/hci_core.h:1523 [inline] BUG: KASAN: slab-use-after-free in __sco_sock_close+0x2bc/0x690 net/bluetooth/sco.c:444 Write of size 4 at addr ffff888079e5e010 by task syz-executor321/5276 CPU: 0 PID: 5276 Comm: syz-executor321 Not tainted 6.5.0-syzkaller-09276-g99d99825fc07 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: <TASK> __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 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0xef/0x190 mm/kasan/generic.c:187 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:1375 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1523 [inline] __sco_sock_close+0x2bc/0x690 net/bluetooth/sco.c:444 sco_sock_close net/bluetooth/sco.c:469 [inline] sco_sock_release+0x6f/0x2c0 net/bluetooth/sco.c:1246 __sock_release+0xae/0x260 net/socket.c:659 sock_close+0x1c/0x20 net/socket.c:1401 __fput+0x3f7/0xa70 fs/file_table.c:384 task_work_run+0x14d/0x240 kernel/task_work.c:179 ptrace_notify+0x10c/0x130 kernel/signal.c:2387 ptrace_report_syscall include/linux/ptrace.h:411 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:473 [inline] syscall_exit_work kernel/entry/common.c:251 [inline] syscall_exit_to_user_mode_prepare+0x120/0x220 kernel/entry/common.c:278 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0xd/0x60 kernel/entry/common.c:296 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fe1bd28f279 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 19 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:00007fe1bca4e218 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: 0000000000000000 RBX: 00007fe1bd319328 RCX: 00007fe1bd28f279 RDX: 0000000000000008 RSI: 0000000020000040 RDI: 0000000000000004 RBP: 00007fe1bd319320 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000004 R14: 00007fe1bca4e670 R15: 0000000000000000 </TASK> Allocated by task 5276: 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] hci_conn_add+0xc2/0x1770 net/bluetooth/hci_conn.c:957 hci_connect_sco+0x3ac/0xf80 net/bluetooth/hci_conn.c:1692 sco_connect net/bluetooth/sco.c:266 [inline] sco_sock_connect+0x2c7/0xa50 net/bluetooth/sco.c:591 __sys_connect_file+0x15b/0x1a0 net/socket.c:2032 __sys_connect+0x145/0x170 net/socket.c:2049 __do_sys_connect net/socket.c:2059 [inline] __se_sys_connect net/socket.c:2056 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2056 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 5054: 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+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [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 device_release+0xa1/0x240 drivers/base/core.c:2484 kobject_cleanup lib/kobject.c:682 [inline] kobject_release lib/kobject.c:713 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1f7/0x5b0 lib/kobject.c:730 put_device+0x1f/0x30 drivers/base/core.c:3731 hci_abort_conn_sync+0xacb/0xe20 net/bluetooth/hci_sync.c:5435 abort_conn_sync+0x18e/0x3a0 net/bluetooth/hci_conn.c:2894 hci_cmd_sync_work+0x1a4/0x3c0 net/bluetooth/hci_sync.c:306 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2600 worker_thread+0x687/0x1110 kernel/workqueue.c:2751 kthread+0x33a/0x430 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 The buggy address belongs to the object at ffff888079e5e000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 16 bytes inside of freed 4096-byte region [ffff888079e5e000, ffff888079e5f000) The buggy address belongs to the physical page: page:ffffea0001e79600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x79e58 head:ffffea0001e79600 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888012842140 dead000000000100 dead000000000122 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4494, tgid 4494 (udevd), ts 25028304092, free_ts 25023027630 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1536 prep_new_page mm/page_alloc.c:1543 [inline] get_page_from_freelist+0x10a9/0x31e0 mm/page_alloc.c:3183 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4439 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2298 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab+0x251/0x380 mm/slub.c:2017 new_slab mm/slub.c:2070 [inline] ___slab_alloc+0x8be/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+0x2a1/0x710 security/tomoyo/file.c:922 tomoyo_path_rename+0x102/0x1b0 security/tomoyo/tomoyo.c:299 security_path_rename+0x148/0x230 security/security.c:1828 do_renameat2+0x78b/0xdc0 fs/namei.c:4999 __do_sys_rename fs/namei.c:5058 [inline] __se_sys_rename fs/namei.c:5056 [inline] __x64_sys_rename+0x81/0xa0 fs/namei.c:5056 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:1136 [inline] free_unref_page_prepare+0x476/0xa40 mm/page_alloc.c:2312 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2405 __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:186 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3478 [inline] __kmem_cache_alloc_node+0x19b/0x350 mm/slub.c:3517 kmalloc_trace+0x25/0xe0 mm/slab_common.c:1114 kmalloc include/linux/slab.h:599 [inline] kzalloc include/linux/slab.h:720 [inline] kernfs_get_open_node fs/kernfs/file.c:572 [inline] kernfs_fop_open+0xad1/0xe00 fs/kernfs/file.c:740 do_dentry_open+0x88b/0x1730 fs/open.c:929 do_open fs/namei.c:3639 [inline] path_openat+0x19af/0x29c0 fs/namei.c:3796 do_filp_open+0x1de/0x430 fs/namei.c:3823 do_sys_openat2+0x176/0x1e0 fs/open.c:1422 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+0x175/0x210 fs/open.c:1448 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 Memory state around the buggy address: ffff888079e5df00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888079e5df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888079e5e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888079e5e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888079e5e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
