================================================================== 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 ffffc90003367a50 by task syz.1.757/7670 CPU: 0 UID: 0 PID: 7670 Comm: syz.1.757 Not tainted 6.11.0-rc1-syzkaller-00044-g22f546873149 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 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 common_interrupt+0xb0/0xd0 arch/x86/kernel/irq.c:278 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 RIP: 0010:rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline] RIP: 0010:rcu_is_watching+0x41/0xc0 kernel/rcu/tree.c:726 Code: 03 00 83 f8 07 89 c5 0f 87 82 00 00 00 48 8d 3c ed 60 1b 7b 8d 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <75> 5c 48 03 1c ed 60 1b 7b 8d 48 b8 00 00 00 00 00 fc ff df 48 89 RSP: 0018:ffffc90003367500 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000037ec8 RCX: ffffffff8168761b RDX: 1ffffffff1af636c RSI: ffffffff8bb081c0 RDI: ffffffff8d7b1b60 RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff202559b R10: ffffffff9012acdf R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff8ddb52e0 R15: 0000000000000000 trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x47b/0x560 kernel/locking/lockdep.c:5730 rcu_lock_acquire include/linux/rcupdate.h:326 [inline] rcu_read_lock_sched include/linux/rcupdate.h:930 [inline] pfn_valid include/linux/mmzone.h:2024 [inline] page_table_check_clear mm/page_table_check.c:70 [inline] __page_table_check_pte_clear+0x1c0/0x580 mm/page_table_check.c:169 page_table_check_pte_clear include/linux/page_table_check.h:49 [inline] ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1284 [inline] get_and_clear_full_ptes include/linux/pgtable.h:678 [inline] zap_present_folio_ptes mm/memory.c:1493 [inline] zap_present_ptes mm/memory.c:1576 [inline] zap_pte_range mm/memory.c:1618 [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+0x21ac/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: 0033:0x7f764d177299 Code: Unable to access opcode bytes at 0x7f764d17726f. RSP: 002b:00007f764dfb00f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f764d305f88 RCX: 00007f764d177299 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f764d305f88 RBP: 00007f764d305f80 R08: 00007f764dfb06c0 R09: 00007f764dfb06c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f764d305f8c R13: 000000000000000b R14: 00007ffcbab8b8e0 R15: 00007ffcbab8b9c8 The buggy address belongs to stack of task syz.1.757/7670 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 [ffffc90003360000, ffffc90003369000) 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:0xffff88807cc1b000 pfn:0x7cc1b memcg:ffff888079e45602 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: ffff88807cc1b000 0000000000000000 00000001ffffffff ffff888079e45602 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 7669, tgid 7669 (syz.1.757), ts 300447823726, free_ts 300175479893 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 7667 tgid 7665 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 bpf_check+0x1acd/0xa210 kernel/bpf/verifier.c:21805 bpf_prog_load+0xedb/0x2660 kernel/bpf/syscall.c:2908 __sys_bpf+0x8e9/0x4a20 kernel/bpf/syscall.c:5710 __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 Memory state around the buggy address: ffffc90003367900: 00 f2 f2 f2 00 f2 f2 f2 00 00 f2 f2 00 00 00 00 ffffc90003367980: 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 >ffffc90003367a00: 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 ^ ffffc90003367a80: 00 00 00 f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 ffffc90003367b00: 00 00 00 00 00 00 00 f3 f3 f3 f3 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: 03 00 add (%rax),%eax 2: 83 f8 07 cmp $0x7,%eax 5: 89 c5 mov %eax,%ebp 7: 0f 87 82 00 00 00 ja 0x8f d: 48 8d 3c ed 60 1b 7b lea -0x7284e4a0(,%rbp,8),%rdi 14: 8d 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 48 89 fa mov %rdi,%rdx 22: 48 c1 ea 03 shr $0x3,%rdx 26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) * 2a: 75 5c jne 0x88 <-- trapping instruction 2c: 48 03 1c ed 60 1b 7b add -0x7284e4a0(,%rbp,8),%rbx 33: 8d 34: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 3b: fc ff df 3e: 48 rex.W 3f: 89 .byte 0x89