================================================================== BUG: KASAN: slab-use-after-free in consumer_del kernel/events/uprobes.c:772 [inline] BUG: KASAN: slab-use-after-free in __uprobe_unregister+0x210/0x260 kernel/events/uprobes.c:1087 Read of size 8 at addr ffff88801d7ea9b8 by task syz.3.280/6370 CPU: 2 UID: 0 PID: 6370 Comm: syz.3.280 Not tainted 6.11.0-rc2-syzkaller-00027-g6a0e38264012 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 consumer_del kernel/events/uprobes.c:772 [inline] __uprobe_unregister+0x210/0x260 kernel/events/uprobes.c:1087 uprobe_unregister+0x45/0x70 kernel/events/uprobes.c:1111 bpf_uprobe_unregister+0xfb/0x1d0 kernel/trace/bpf_trace.c:3187 bpf_uprobe_multi_link_release+0x6d/0x180 kernel/trace/bpf_trace.c:3197 bpf_link_free+0x12c/0x2b0 kernel/bpf/syscall.c:3067 bpf_link_put_direct kernel/bpf/syscall.c:3107 [inline] bpf_link_release+0x63/0x80 kernel/bpf/syscall.c:3114 __fput+0x408/0xbb0 fs/file_table.c:422 task_work_run+0x14e/0x250 kernel/task_work.c:228 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f03d39779f9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffea41d4a78 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 0000000000014954 RCX: 00007f03d39779f9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007ffea41d4b50 R08: 0000000000000001 R09: 00007ffea41d4d5f R10: 00007f03d3800000 R11: 0000000000000246 R12: 0000000000000032 R13: 00007ffea41d4b70 R14: 00007ffea41d4b90 R15: ffffffffffffffff Allocated by task 6371: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4158 [inline] __kmalloc_node_noprof+0x211/0x430 mm/slub.c:4164 __kvmalloc_node_noprof+0x9d/0x1a0 mm/util.c:650 kvmalloc_array_node_noprof include/linux/slab.h:833 [inline] bpf_uprobe_multi_link_attach+0x45d/0xe20 kernel/trace/bpf_trace.c:3439 link_create kernel/bpf/syscall.c:5319 [inline] __sys_bpf+0x41ff/0x4a20 kernel/bpf/syscall.c:5780 __do_sys_bpf kernel/bpf/syscall.c:5817 [inline] __se_sys_bpf kernel/bpf/syscall.c:5815 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5815 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6371: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x12a/0x3b0 mm/slub.c:4594 kvfree+0x47/0x50 mm/util.c:696 bpf_uprobe_multi_link_attach+0xaae/0xe20 kernel/trace/bpf_trace.c:3500 link_create kernel/bpf/syscall.c:5319 [inline] __sys_bpf+0x41ff/0x4a20 kernel/bpf/syscall.c:5780 __do_sys_bpf kernel/bpf/syscall.c:5817 [inline] __se_sys_bpf kernel/bpf/syscall.c:5815 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5815 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88801d7ea980 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 56 bytes inside of freed 64-byte region [ffff88801d7ea980, ffff88801d7ea9c0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d7ea flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff8880158428c0 ffffea0000816500 dead000000000004 raw: 0000000000000000 0000000080200020 00000001fdffffff 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 11, tgid 11 (kworker/u32:0), ts 7392881757, free_ts 7240754492 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3442 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4700 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x4e/0xf0 mm/slub.c:2321 allocate_slab mm/slub.c:2484 [inline] new_slab+0x84/0x260 mm/slub.c:2537 ___slab_alloc+0xdac/0x1870 mm/slub.c:3723 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_node_noprof+0x357/0x430 mm/slub.c:4164 kmalloc_node_noprof include/linux/slab.h:708 [inline] __vmalloc_area_node mm/vmalloc.c:3646 [inline] __vmalloc_node_range_noprof+0x401/0x1520 mm/vmalloc.c:3841 alloc_thread_stack_node kernel/fork.c:313 [inline] dup_task_struct kernel/fork.c:1113 [inline] copy_process+0x2f3b/0x8de0 kernel/fork.c:2204 kernel_clone+0xfd/0x980 kernel/fork.c:2781 user_mode_thread+0xb4/0xf0 kernel/fork.c:2859 call_usermodehelper_exec_work kernel/umh.c:172 [inline] call_usermodehelper_exec_work+0xcb/0x170 kernel/umh.c:158 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf20 kernel/workqueue.c:3390 kthread+0x2c1/0x3a0 kernel/kthread.c:389 page last free pid 59 tgid 59 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2612 vfree+0x181/0x7a0 mm/vmalloc.c:3364 delayed_vfree_work+0x56/0x70 mm/vmalloc.c:3285 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf20 kernel/workqueue.c:3390 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff88801d7ea880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801d7ea900: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88801d7ea980: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88801d7eaa00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801d7eaa80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ==================================================================