R10: 0000000000000001 R11: 0000000000000246 R12: 00007fa610b64618 R13: 00007fffd74df1e8 R14: 0000000000000001 R15: 0000000000000001 ================================================================== BUG: KASAN: slab-use-after-free in consumer_del kernel/events/uprobes.c:772 [inline] BUG: KASAN: slab-use-after-free in uprobe_unregister+0x99/0x220 kernel/events/uprobes.c:1097 Read of size 8 at addr ffff88807a32d340 by task syz-executor266/5225 CPU: 0 UID: 0 PID: 5225 Comm: syz-executor266 Not tainted 6.11.0-rc3-next-20240816-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 consumer_del kernel/events/uprobes.c:772 [inline] uprobe_unregister+0x99/0x220 kernel/events/uprobes.c:1097 bpf_uprobe_unregister kernel/trace/bpf_trace.c:3119 [inline] bpf_uprobe_multi_link_release+0x8c/0x1b0 kernel/trace/bpf_trace.c:3127 bpf_link_free+0xf5/0x250 kernel/bpf/syscall.c:2998 bpf_link_put_direct kernel/bpf/syscall.c:3038 [inline] bpf_link_release+0x7b/0x90 kernel/bpf/syscall.c:3045 __fput+0x24b/0x890 fs/file_table.c:424 task_work_run+0x24f/0x310 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x28e0 kernel/exit.c:939 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa610af70e9 Code: Unable to access opcode bytes at 0x7fa610af70bf. RSP: 002b:00007fffd74defd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa610af70e9 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007fa610b6a350 R08: ffffffffffffffb8 R09: 00007fa610b60038 R10: 0000000000000001 R11: 0000000000000246 R12: 00007fa610b6a350 R13: 0000000000000000 R14: 00007fa610b6ada0 R15: 00007fa610ac11a0 Allocated by task 5225: 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:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4202 [inline] __kmalloc_node_noprof+0x22a/0x440 mm/slub.c:4208 __kvmalloc_node_noprof+0x72/0x1b0 mm/util.c:658 kvmalloc_array_node_noprof include/linux/slab.h:835 [inline] bpf_uprobe_multi_link_attach+0x43e/0xb90 kernel/trace/bpf_trace.c:3369 link_create+0x6e9/0x870 kernel/bpf/syscall.c:5236 __sys_bpf+0x4bc/0x810 kernel/bpf/syscall.c:5697 __do_sys_bpf kernel/bpf/syscall.c:5734 [inline] __se_sys_bpf kernel/bpf/syscall.c:5732 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5732 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5225: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2295 [inline] slab_free mm/slub.c:4517 [inline] kfree+0x196/0x3e0 mm/slub.c:4665 bpf_uprobe_multi_link_attach+0xa7d/0xb90 kernel/trace/bpf_trace.c:3431 link_create+0x6e9/0x870 kernel/bpf/syscall.c:5236 __sys_bpf+0x4bc/0x810 kernel/bpf/syscall.c:5697 __do_sys_bpf kernel/bpf/syscall.c:5734 [inline] __se_sys_bpf kernel/bpf/syscall.c:5732 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5732 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807a32d300 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 64 bytes inside of freed 96-byte region [ffff88807a32d300, ffff88807a32d360) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7a32d flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff888015841280 ffffea000085f000 0000000000000004 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 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 4687, tgid 4687 (udevd), ts 32727107953, free_ts 32715952057 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1518 prep_new_page mm/page_alloc.c:1526 [inline] get_page_from_freelist+0x3004/0x30c0 mm/page_alloc.c:3477 __alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4744 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2364 allocate_slab+0x5a/0x2f0 mm/slub.c:2527 new_slab mm/slub.c:2580 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3767 __slab_alloc+0x58/0xa0 mm/slub.c:3857 __slab_alloc_node mm/slub.c:3910 [inline] slab_alloc_node mm/slub.c:4069 [inline] __do_kmalloc_node mm/slub.c:4201 [inline] __kmalloc_noprof+0x25a/0x400 mm/slub.c:4214 kmalloc_noprof include/linux/slab.h:685 [inline] kzalloc_noprof include/linux/slab.h:807 [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_symlink+0xde/0x120 security/tomoyo/tomoyo.c:212 security_path_symlink+0xe3/0x140 security/security.c:1889 do_symlinkat+0x136/0x3a0 fs/namei.c:4639 __do_sys_symlink fs/namei.c:4662 [inline] __se_sys_symlink fs/namei.c:4660 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4660 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 page last free pid 4681 tgid 4681 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1099 [inline] free_unref_page+0xc07/0xd90 mm/page_alloc.c:2652 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0x57/0xc0 arch/x86/kernel/apic/apic.c:1037 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Memory state around the buggy address: ffff88807a32d200: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff88807a32d280: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc >ffff88807a32d300: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88807a32d380: 00 00 00 00 00 00 00 00 06 fc fc fc fc fc fc fc ffff88807a32d400: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================