================================================================== BUG: KASAN: stack-out-of-bounds in bpf_net_ctx_get_all_used_flush_lists include/linux/filter.h:837 [inline] BUG: KASAN: stack-out-of-bounds in xdp_do_check_flushed+0x41c/0x4e0 net/core/filter.c:4298 Read of size 4 at addr ffffc90003557a50 by task syz.3.2767/21951 CPU: 1 UID: 0 PID: 21951 Comm: syz.3.2767 Not tainted 6.10.0-syzkaller-12381-gc33ffdb70cc6 #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 bpf_net_ctx_get_all_used_flush_lists include/linux/filter.h:837 [inline] xdp_do_check_flushed+0x41c/0x4e0 net/core/filter.c:4298 __napi_poll.constprop.0+0xd1/0x550 net/core/dev.c:6774 napi_poll net/core/dev.c:6840 [inline] net_rx_action+0xa92/0x1010 net/core/dev.c:6962 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649 common_interrupt+0xb0/0xd0 arch/x86/kernel/irq.c:278 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 RIP: 0010:console_flush_all+0xa19/0xd70 kernel/printk/printk.c:3055 Code: e8 dc 88 26 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 4a 39 1f 00 48 85 db 0f 85 8b 01 00 00 e8 0c 3e 1f 00 fb 48 8b 04 24 <4c> 89 fa 83 e2 07 0f b6 00 38 d0 7f 08 84 c0 0f 85 a9 02 00 00 41 RSP: 0018:ffffc90003557910 EFLAGS: 00000293 RAX: fffff520006aaf49 RBX: 0000000000000000 RCX: ffffffff816b4886 RDX: ffff88803f364880 RSI: ffffffff816b4894 RDI: 0000000000000007 RBP: dffffc0000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000200 R13: ffffffff8e7ca038 R14: ffffffff8e7c9fe0 R15: ffffc90003557a48 console_unlock+0xae/0x290 kernel/printk/printk.c:3118 vprintk_emit kernel/printk/printk.c:2348 [inline] vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2303 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45 _printk+0xc8/0x100 kernel/printk/printk.c:2373 check_stack_usage kernel/exit.c:794 [inline] do_exit+0x2047/0x2bb0 kernel/exit.c:925 do_group_exit+0xd3/0x2a0 kernel/exit.c:1031 get_signal+0x25fd/0x2770 kernel/signal.c:2917 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [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+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6276175f19 Code: Unable to access opcode bytes at 0x7f6276175eef. RSP: 002b:00007f6276ed80f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f6276305f68 RCX: 00007f6276175f19 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f6276305f68 RBP: 00007f6276305f60 R08: 00007f6276ed86c0 R09: 00007f6276ed86c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6276305f6c R13: 000000000000000b R14: 00007ffe2a1636f0 R15: 00007ffe2a1637d8 The buggy address belongs to stack of task syz.3.2767/21951 and is located at offset 56 in frame: console_unlock+0x0/0x290 kernel/printk/printk.c:3036 This frame has 2 objects: [48, 49) 'handover' [64, 72) 'next_seq' The buggy address belongs to the virtual mapping at [ffffc90003550000, ffffc90003559000) created by: kernel_clone+0xfd/0x980 kernel/fork.c:2781 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x2015e pfn:0x1eb9f flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 000000000002015e 0000000000000000 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 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 21934, tgid 21933 (syz.3.2761), ts 469550492497, free_ts 469534374773 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:3438 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4696 alloc_pages_mpol_noprof+0x275/0x610 mm/mempolicy.c:2263 vm_area_alloc_pages mm/vmalloc.c:3584 [inline] __vmalloc_area_node mm/vmalloc.c:3660 [inline] __vmalloc_node_range_noprof+0xa6a/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 __do_sys_clone+0xba/0x100 kernel/fork.c:2924 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 page last free pid 20237 tgid 20237 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:2608 __folio_put+0x31c/0x3e0 mm/swap.c:128 folio_put include/linux/mm.h:1486 [inline] free_page_and_swap_cache+0x249/0x2c0 mm/swap_state.c:308 __tlb_remove_table arch/x86/include/asm/tlb.h:34 [inline] __tlb_remove_table_free mm/mmu_gather.c:227 [inline] tlb_remove_table_rcu+0x89/0xe0 mm/mmu_gather.c:282 rcu_do_batch kernel/rcu/tree.c:2569 [inline] rcu_core+0x828/0x16b0 kernel/rcu/tree.c:2843 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Memory state around the buggy address: ffffc90003557900: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 ffffc90003557980: 00 00 00 00 f3 f3 f3 f3 00 00 00 00 00 00 00 00 >ffffc90003557a00: 00 00 00 f1 f1 f1 f1 f1 f1 01 f2 00 f3 f3 f3 00 ^ ffffc90003557a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90003557b00: 00 00 00 00 00 f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 ================================================================== ---------------- Code disassembly (best guess): 0: e8 dc 88 26 00 call 0x2688e1 5: 9c pushf 6: 5b pop %rbx 7: 81 e3 00 02 00 00 and $0x200,%ebx d: 31 ff xor %edi,%edi f: 48 89 de mov %rbx,%rsi 12: e8 4a 39 1f 00 call 0x1f3961 17: 48 85 db test %rbx,%rbx 1a: 0f 85 8b 01 00 00 jne 0x1ab 20: e8 0c 3e 1f 00 call 0x1f3e31 25: fb sti 26: 48 8b 04 24 mov (%rsp),%rax * 2a: 4c 89 fa mov %r15,%rdx <-- trapping instruction 2d: 83 e2 07 and $0x7,%edx 30: 0f b6 00 movzbl (%rax),%eax 33: 38 d0 cmp %dl,%al 35: 7f 08 jg 0x3f 37: 84 c0 test %al,%al 39: 0f 85 a9 02 00 00 jne 0x2e8 3f: 41 rex.B