------------[ cut here ]------------ Too BIG xdp->frame_sz = 131072 WARNING: CPU: 0 PID: 8517 at net/core/filter.c:4069 bpf_xdp_adjust_tail+0x228/0x230 net/core/filter.c:4051 Modules linked in: CPU: 0 PID: 8517 Comm: syz-executor.1 Not tainted 6.1.43-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : bpf_xdp_adjust_tail+0x228/0x230 net/core/filter.c:4051 lr : ____bpf_xdp_adjust_tail net/core/filter.c:4069 [inline] lr : bpf_xdp_adjust_tail+0x224/0x230 net/core/filter.c:4051 sp : ffff80001fdc74b0 x29: ffff80001fdc74b0 x28: ffff00012a06ff0f x27: 1ffff00003fb8ee1 x26: dfff800000000000 x25: ffff80001fdc7718 x24: 0000000000000020 x23: 0000000000020000 x22: ffff00012a06feef x21: ffff80001fdc7700 x20: ffff80001fdc7708 x19: ffff8000181b9000 x18: ffff80001fdc7720 x17: 0000000000000000 x16: ffff800012117bc4 x15: 0000000000000000 x14: 0000000000000002 x13: 0000000000000001 x12: 0000000000040000 x11: 00000000000053fd x10: ffff800022b8a000 x9 : 84372821ebffa700 x8 : 84372821ebffa700 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001fdc6d98 x4 : ffff800015982b20 x3 : ffff800008588f44 x2 : 0000000000000001 x1 : 0000000000000200 x0 : ffffffffffffffea Call trace: bpf_xdp_adjust_tail+0x228/0x230 net/core/filter.c:4051 bpf_prog_5f065984e7f319a0+0x50/0x80 bpf_dispatcher_xdp_func+0x30/0x44 net/core/filter.c:11426 __bpf_prog_run include/linux/filter.h:600 [inline] bpf_prog_run_xdp include/linux/filter.h:775 [inline] bpf_prog_run_generic_xdp+0x428/0xf44 net/core/dev.c:4766 netif_receive_generic_xdp net/core/dev.c:4852 [inline] do_xdp_generic+0x348/0x634 net/core/dev.c:4911 tun_get_user+0x1e40/0x386c drivers/net/tun.c:1913 tun_chr_write_iter+0xfc/0x204 drivers/net/tun.c:2037 call_write_iter include/linux/fs.h:2205 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x610/0x914 fs/read_write.c:584 ksys_write+0x15c/0x26c fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 irq event stamp: 1657 hardirqs last enabled at (1656): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:261 hardirqs last disabled at (1657): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (1476): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1592): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- Illegal XDP return value 4294967274 on prog (id 78) dev syz_tun, expect packet loss!