Hi Kernel Maintainers, we found a crash "KASAN: slab-use-after-free Read in lookup_object_or_alloc" (it is a KASAN and makes the kernel reboot) in upstream, we also have successfully reproduced it manually: HEAD Commit: 28eb75e178d389d325f1666e422bc13bbbb9804c (Date: Thu Nov 21 14:56:17 2024 -0800 Merge: 071b34dcf715 a163b8950778) kernel config: https://raw.githubusercontent.com/androidAppGuard/KernelBugs/main/6.12.config console output: https://raw.githubusercontent.com/androidAppGuard/KernelBugs/main/28eb75e178d389d325f1666e422bc13bbbb9804c/6c36a187a46a303da83a68b5edb341c1f04ea717/repro.log repro report: https://raw.githubusercontent.com/androidAppGuard/KernelBugs/main/28eb75e178d389d325f1666e422bc13bbbb9804c/6c36a187a46a303da83a68b5edb341c1f04ea717/repro.report syz reproducer: https://raw.githubusercontent.com/androidAppGuard/KernelBugs/main/28eb75e178d389d325f1666e422bc13bbbb9804c/6c36a187a46a303da83a68b5edb341c1f04ea717/repro.prog c reproducer: https://raw.githubusercontent.com/androidAppGuard/KernelBugs/main/28eb75e178d389d325f1666e422bc13bbbb9804c/6c36a187a46a303da83a68b5edb341c1f04ea717/repro.cprog Please let me know if there is anything I can help with. Best, Hui Guo This is the repro report ============================================================================================= BUG: KASAN: slab-use-after-free in timer_is_static_object+0x86/0xa0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/time/timer.c:733 Read of size 8 at addr ffff88802256a8a0 by task syz-executor302/162870 CPU: 0 UID: 0 PID: 162870 Comm: syz-executor302 Not tainted 6.12.0-07749-g28eb75e178d3 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace: <TASK> __dump_stack data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1b0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/lib/dump_stack.c:120 print_address_description data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/report.c:377 [inline] print_report+0xc0/0x5e0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/report.c:488 kasan_report+0xbd/0xf0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/report.c:601 timer_is_static_object+0x86/0xa0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/time/timer.c:733 lookup_object_or_alloc.part.0+0x407/0x590 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/lib/debugobjects.c:679 lookup_object_or_alloc data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/lib/debugobjects.c:426 [inline] debug_object_assert_init+0x1ed/0x360 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/lib/debugobjects.c:1008 debug_timer_assert_init data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/time/timer.c:845 [inline] debug_assert_init data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/time/timer.c:890 [inline] __timer_delete+0x78/0x1b0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/time/timer.c:1412 del_timer data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/timer.h:202 [inline] try_to_grab_pending+0x80/0x840 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/workqueue.c:2064 work_grab_pending data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/workqueue.c:2157 [inline] __cancel_work+0x8d/0x350 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/workqueue.c:4322 sco_sock_clear_timer+0x4f/0xe0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/bluetooth/sco.c:180 sco_sock_close data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/bluetooth/sco.c:522 [inline] sco_sock_release+0x77/0x2d0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/bluetooth/sco.c:1298 __sock_release+0xb3/0x270 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/socket.c:640 sock_close+0x1c/0x30 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/socket.c:1408 __fput+0x3fb/0xb40 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/file_table.c:450 task_work_run+0x16c/0x260 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/task_work.c:239 get_signal+0x1ce/0x2540 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/signal.c:2789 arch_do_signal_or_restart+0x81/0x7d0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/arch/x86/kernel/signal.c:337 exit_to_user_mode_loop data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/entry/common.c:218 do_syscall_64+0xd8/0x250 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f23b7809cdd Code: c3 e8 27 27 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 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:00007f23b6fa6198 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 00007f23b78ad080 RCX: 00007f23b7809cdd RDX: 0000000000000008 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00007f23b6fa65f0 R14: 00007f23b78ad088 R15: 0000000000000000 </TASK> Allocated by task 162708: kasan_save_stack+0x24/0x50 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/common.c:47 kasan_save_track+0x14/0x30 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/common.c:68 poison_kmalloc_redzone data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/common.c:394 kmalloc_noprof data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/slab.h:879 [inline] kzalloc_noprof data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/slab.h:1015 [inline] sco_conn_add data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/bluetooth/sco.c:199 [inline] sco_conn_add+0xcd/0x400 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/bluetooth/sco.c:184 sco_connect data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/bluetooth/sco.c:336 [inline] sco_sock_connect+0x342/0xbf0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/bluetooth/sco.c:645 __sys_connect_file+0x14c/0x1b0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/socket.c:2055 __sys_connect+0x174/0x1a0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/socket.c:2074 __do_sys_connect data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/socket.c:2080 [inline] __se_sys_connect data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/socket.c:2077 [inline] __x64_sys_connect+0x72/0xb0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/socket.c:2077 do_syscall_x64 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcb/0x250 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 162708: kasan_save_stack+0x24/0x50 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/common.c:47 kasan_save_track+0x14/0x30 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/generic.c:579 poison_slab_object data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/common.c:247 [inline] __kasan_slab_free+0x54/0x70 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/common.c:264 kasan_slab_free data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/kasan.h:230 [inline] slab_free_hook data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:2342 [inline] slab_free data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:4579 [inline] kfree+0x14b/0x4b0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:4727 sco_conn_free data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/bluetooth/sco.c:97 [inline] kref_put data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/kref.h:65 [inline] sco_conn_put+0x2cc/0x4d0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/bluetooth/sco.c:107 sco_chan_del+0x9c/0x1b0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/bluetooth/sco.c:236 __sco_sock_close+0x80/0x220 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/bluetooth/sco.c:508 sco_sock_close data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/bluetooth/sco.c:523 [inline] sco_sock_release+0x7f/0x2d0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/bluetooth/sco.c:1298 __sock_release+0xb3/0x270 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/socket.c:640 sock_close+0x1c/0x30 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/net/socket.c:1408 __fput+0x3fb/0xb40 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/file_table.c:450 task_work_run+0x16c/0x260 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/task_work.c:239 get_signal+0x1ce/0x2540 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/signal.c:2789 arch_do_signal_or_restart+0x81/0x7d0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/arch/x86/kernel/signal.c:337 exit_to_user_mode_loop data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/entry/common.c:218 do_syscall_64+0xd8/0x250 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802256a800 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 160 bytes inside of freed 256-byte region [ffff88802256a800, ffff88802256a900) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22568 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801ac42b40 ffffea00010e5400 dead000000000003 raw: 0000000000000000 0000000000200020 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801ac42b40 ffffea00010e5400 dead000000000003 head: 0000000000000000 0000000000200020 00000001f5000000 0000000000000000 head: 00fff00000000002 ffffea0000895a01 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5294, tgid 5294 (systemd-journal), ts 38269438886, free_ts 38258013698 set_page_owner data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2e7/0x350 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/page_alloc.c:1556 prep_new_page data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xe4e/0x2b20 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/page_alloc.c:3474 __alloc_pages_noprof+0x219/0x21e0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x2b6/0x600 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/mempolicy.c:2265 alloc_slab_page data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:2412 [inline] allocate_slab data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:2578 [inline] new_slab+0x2d5/0x420 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:2631 ___slab_alloc+0xbb7/0x1860 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:3818 __slab_alloc.constprop.0+0x56/0xb0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:3908 __slab_alloc_node data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:3961 [inline] slab_alloc_node data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:4122 [inline] __kmalloc_cache_noprof+0x2be/0x310 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:4290 kmalloc_noprof data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/slab.h:879 [inline] inode_doinit_use_xattr+0x54/0x420 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/security/selinux/hooks.c:1361 inode_doinit_with_dentry+0xcf2/0x11e0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/security/selinux/hooks.c:1555 selinux_d_instantiate+0x27/0x30 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/security/selinux/hooks.c:6372 security_d_instantiate+0x142/0x1a0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/security/security.c:4070 d_splice_alias+0x90/0xde0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/dcache.c:3001 kernfs_iop_lookup+0x286/0x330 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/kernfs/dir.c:1229 __lookup_slow+0x252/0x470 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/namei.c:1791 lookup_slow data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/namei.c:1808 [inline] walk_component+0x346/0x5b0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/namei.c:2112 page last free pid 5294 tgid 5294 stack trace: reset_page_owner data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/page_owner.h:25 [inline] free_pages_prepare data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/page_alloc.c:1127 [inline] free_unref_page+0x714/0x10c0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/page_alloc.c:2657 qlink_free data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x50/0x120 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x67/0x90 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/kasan/common.c:329 kasan_slab_alloc data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/kasan.h:247 [inline] slab_post_alloc_hook data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:4085 [inline] slab_alloc_node data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:4134 [inline] kmem_cache_alloc_noprof+0x121/0x2f0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/mm/slub.c:4141 getname_flags.part.0+0x4b/0x560 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/namei.c:139 getname_flags+0x95/0xe0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/audit.h:322 do_readlinkat.part.0+0x90/0x340 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/stat.c:561 do_readlinkat data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/stat.c:557 [inline] __do_sys_readlinkat data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/stat.c:593 [inline] __se_sys_readlinkat data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/stat.c:590 [inline] __x64_sys_readlinkat+0xbf/0x110 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/stat.c:590 do_syscall_x64 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcb/0x250 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88802256a780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802256a800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802256a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802256a900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802256a980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================
