================================================================== 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:4305 Read of size 4 at addr ffffc900036c7a50 by task syz.2.367/6910 CPU: 2 UID: 0 PID: 6910 Comm: syz.2.367 Not tainted 6.11.0-rc1-syzkaller-00063-g21b136cc63d2 #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:4305 __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 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 RIP: 0010:write_comp_data+0x7d/0x90 kernel/kcov.c:262 Code: 00 00 4a 8d 34 dd 28 00 00 00 48 39 f2 72 1b 48 83 c7 01 48 89 38 4c 89 44 30 e0 4c 89 4c 30 e8 4c 89 54 30 f0 4a 89 4c d8 20 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 RSP: 0018:ffffc900036c75f8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 00000000000000a3 RCX: ffffffff81d4c019 RDX: ffff88802ad1c880 RSI: 00000000000001f2 RDI: 0000000000000004 RBP: 00000000000001f2 R08: 0000000000000004 R09: 00000000000001f2 R10: 00000000000000a3 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff88801e41d000 R15: ffffea0001314200 tlb_flush_rmap_batch+0x179/0x2f0 mm/mmu_gather.c:55 tlb_flush_rmaps+0xa4/0x100 mm/mmu_gather.c:89 zap_pte_range mm/memory.c:1686 [inline] zap_pmd_range mm/memory.c:1736 [inline] zap_pud_range mm/memory.c:1765 [inline] zap_p4d_range mm/memory.c:1786 [inline] unmap_page_range+0x1c6e/0x3c10 mm/memory.c:1807 unmap_single_vma+0x194/0x2b0 mm/memory.c:1853 unmap_vmas+0x22f/0x490 mm/memory.c:1897 exit_mmap+0x1b8/0xb20 mm/mmap.c:3412 __mmput+0x12a/0x480 kernel/fork.c:1345 mmput+0x62/0x70 kernel/fork.c:1367 exit_mm kernel/exit.c:571 [inline] do_exit+0x9bf/0x2bb0 kernel/exit.c:869 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: 0033:0x7fb68ab773b9 Code: Unable to access opcode bytes at 0x7fb68ab7738f. RSP: 002b:00007fb68b9be0f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fb68ad05f88 RCX: 00007fb68ab773b9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb68ad05f88 RBP: 00007fb68ad05f80 R08: 00007fb68b9be6c0 R09: 00007fb68b9be6c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb68ad05f8c R13: 000000000000000b R14: 00007ffcf5930330 R15: 00007ffcf5930418 The buggy address belongs to stack of task syz.2.367/6910 and is located at offset 24 in frame: exit_mmap+0x0/0xb20 mm/mmap.c:3232 This frame has 2 objects: [32, 96) 'vmi' [128, 256) 'tlb' The buggy address belongs to the virtual mapping at [ffffc900036c0000, ffffc900036c9000) 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:0x0 pfn:0x2926b memcg:ffff88801cf37282 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff ffff88801cf37282 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 6909, tgid 6909 (syz.2.367), ts 156504948827, free_ts 150593884206 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_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_clone3+0x1f5/0x270 kernel/fork.c:3085 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 6801 tgid 6800 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 __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: ffffc900036c7900: 00 f2 f2 f2 00 f2 f2 f2 00 00 f2 f2 00 00 00 00 ffffc900036c7980: 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 >ffffc900036c7a00: 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 ^ ffffc900036c7a80: 00 00 00 f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 ffffc900036c7b00: 00 00 00 00 00 00 00 f3 f3 f3 f3 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 4a 8d 34 dd 28 00 00 lea 0x28(,%r11,8),%rsi 9: 00 a: 48 39 f2 cmp %rsi,%rdx d: 72 1b jb 0x2a f: 48 83 c7 01 add $0x1,%rdi 13: 48 89 38 mov %rdi,(%rax) 16: 4c 89 44 30 e0 mov %r8,-0x20(%rax,%rsi,1) 1b: 4c 89 4c 30 e8 mov %r9,-0x18(%rax,%rsi,1) 20: 4c 89 54 30 f0 mov %r10,-0x10(%rax,%rsi,1) 25: 4a 89 4c d8 20 mov %rcx,0x20(%rax,%r11,8) * 2a: c3 ret <-- trapping instruction 2b: cc int3 2c: cc int3 2d: cc int3 2e: cc int3 2f: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 36: 00 00 00 00 3a: 0f 1f 00 nopl (%rax) 3d: 90 nop 3e: 90 nop 3f: 90 nop