================================================================== BUG: KASAN: slab-use-after-free in __bpf_trace_run kernel/trace/bpf_trace.c:2382 [inline] BUG: KASAN: slab-use-after-free in bpf_trace_run4+0x143/0x580 kernel/trace/bpf_trace.c:2439 Read of size 8 at addr ffff88802d300618 by task syz-executor.4/1433 CPU: 0 PID: 1433 Comm: syz-executor.4 Not tainted 6.8.0-syzkaller-05243-g14bb1e8c8d4a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 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+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 __bpf_trace_run kernel/trace/bpf_trace.c:2382 [inline] bpf_trace_run4+0x143/0x580 kernel/trace/bpf_trace.c:2439 __traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x255d/0x4a20 kernel/sched/core.c:6733 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7058 irqentry_exit+0x5e/0x90 kernel/entry/common.c:348 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__insn_get_emulate_prefix arch/x86/lib/insn.c:91 [inline] RIP: 0010:insn_get_emulate_prefix arch/x86/lib/insn.c:106 [inline] RIP: 0010:insn_get_prefixes+0xfa/0x18b0 arch/x86/lib/insn.c:134 Code: 0f 00 00 48 89 4c 24 08 4c 89 eb 48 c1 eb 03 48 b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 0f 85 01 11 00 00 41 0f b6 6d 00 0f 00 00 00 89 ee e8 fa 65 28 f6 4d 8d 65 02 83 fd 0f 0f 85 15 RSP: 0018:ffffc90003dd7840 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffffffff1455d2f RCX: ffffffff8a2ae979 RDX: ffff88805a419e00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000000000f R08: ffffffff8b6c8c9c R09: 0000000000000000 R10: ffffc90003dd7b80 R11: fffff520007baf7b R12: ffffc90003dd7be8 R13: ffffffff8a2ae978 R14: ffffffff8a2ae987 R15: ffffc90003dd7b80 insn_get_opcode+0x65/0xa90 arch/x86/lib/insn.c:271 insn_get_modrm+0x63/0x730 arch/x86/lib/insn.c:340 insn_get_sib arch/x86/lib/insn.c:414 [inline] insn_get_displacement+0x151/0x9a0 arch/x86/lib/insn.c:455 insn_get_immediate+0x62/0x11f0 arch/x86/lib/insn.c:621 insn_get_length arch/x86/lib/insn.c:694 [inline] insn_decode+0x2d6/0x4c0 arch/x86/lib/insn.c:733 arch_jump_entry_size arch/x86/kernel/jump_label.c:24 [inline] __jump_label_patch+0xe8/0x490 arch/x86/kernel/jump_label.c:45 arch_jump_label_transform_queue+0x68/0x100 arch/x86/kernel/jump_label.c:137 __jump_label_update+0x177/0x3a0 kernel/jump_label.c:475 static_key_slow_inc_cpuslocked+0xb3/0x150 kernel/jump_label.c:165 static_key_slow_inc+0x1a/0x30 kernel/jump_label.c:186 bpf_enable_runtime_stats kernel/bpf/syscall.c:5462 [inline] bpf_enable_stats+0xfe/0x140 kernel/bpf/syscall.c:5481 __sys_bpf+0x75b/0x810 kernel/bpf/syscall.c:5714 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline] __se_sys_bpf kernel/bpf/syscall.c:5736 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5736 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f6e72c7dde9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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:00007f6e739c30c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f6e72dabf80 RCX: 00007f6e72c7dde9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020 RBP: 00007f6e72cca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f6e72dabf80 R15: 00007fff1134ba68 Allocated by task 1429: 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:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x1d9/0x360 mm/slub.c:4012 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] bpf_raw_tp_link_attach+0x2a0/0x6e0 kernel/bpf/syscall.c:3816 bpf_raw_tracepoint_open+0x1c2/0x240 kernel/bpf/syscall.c:3863 __sys_bpf+0x3c0/0x810 kernel/bpf/syscall.c:5673 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline] __se_sys_bpf kernel/bpf/syscall.c:5736 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5736 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Freed by task 1428: 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:589 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 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 bpf_link_release+0x3b/0x50 kernel/bpf/syscall.c:3071 __fput+0x429/0x8a0 fs/file_table.c:423 __do_sys_close fs/open.c:1557 [inline] __se_sys_close fs/open.c:1542 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1542 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff88802d300600 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff88802d300600, ffff88802d300680) The buggy address belongs to the physical page: page:ffffea0000b4c000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2d300 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888014c418c0 ffffea0000ac6f80 dead000000000004 raw: 0000000000000000 0000000000100010 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 4522, tgid 4522 (udevd), ts 97156036661, free_ts 97152207220 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+0x256/0x680 mm/page_alloc.c:4569 __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+0xd1b/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] kmalloc_trace+0x267/0x360 mm/slub.c:4007 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] kernfs_get_open_node fs/kernfs/file.c:523 [inline] kernfs_fop_open+0x803/0xcd0 fs/kernfs/file.c:691 do_dentry_open+0x907/0x15a0 fs/open.c:956 do_open fs/namei.c:3643 [inline] path_openat+0x2860/0x3240 fs/namei.c:3800 do_filp_open+0x235/0x490 fs/namei.c:3827 do_sys_openat2+0x13e/0x1d0 fs/open.c:1407 do_sys_open fs/open.c:1422 [inline] __do_sys_openat fs/open.c:1438 [inline] __se_sys_openat fs/open.c:1433 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1433 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 page last free pid 4522 tgid 4522 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 discard_slab mm/slub.c:2453 [inline] __put_partials+0xeb/0x130 mm/slub.c:2922 put_cpu_partial+0x17c/0x250 mm/slub.c:2997 __slab_free+0x302/0x410 mm/slub.c:4166 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x5e/0xc0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x172/0x350 mm/slub.c:3867 getname_flags+0xbd/0x4f0 fs/namei.c:140 user_path_at_empty+0x2c/0x60 fs/namei.c:2921 do_readlinkat+0x118/0x3b0 fs/stat.c:499 __do_sys_readlink fs/stat.c:532 [inline] __se_sys_readlink fs/stat.c:529 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:529 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Memory state around the buggy address: ffff88802d300500: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ffff88802d300580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802d300600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802d300680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802d300700: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 0f 00 00 sldt (%rax) 3: 48 89 4c 24 08 mov %rcx,0x8(%rsp) 8: 4c 89 eb mov %r13,%rbx b: 48 c1 eb 03 shr $0x3,%rbx f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 16: fc ff df 19: 0f b6 04 03 movzbl (%rbx,%rax,1),%eax 1d: 84 c0 test %al,%al 1f: 0f 85 01 11 00 00 jne 0x1126 25: 41 0f b6 6d 00 movzbl 0x0(%r13),%ebp * 2a: bf 0f 00 00 00 mov $0xf,%edi <-- trapping instruction 2f: 89 ee mov %ebp,%esi 31: e8 fa 65 28 f6 call 0xf6286630 36: 4d 8d 65 02 lea 0x2(%r13),%r12 3a: 83 fd 0f cmp $0xf,%ebp 3d: 0f .byte 0xf 3e: 85 .byte 0x85 3f: 15 .byte 0x15