===================================================== BUG: KMSAN: uninit-value in ___bpf_prog_run+0x9194/0x97a0 kernel/bpf/core.c:1587 CPU: 0 PID: 7460 Comm: syz-executor.3 Not tainted 5.7.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 ___bpf_prog_run+0x9194/0x97a0 kernel/bpf/core.c:1587 __bpf_prog_run32+0x101/0x170 kernel/bpf/core.c:1681 bpf_dispatcher_nop_func include/linux/bpf.h:545 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:599 [inline] bpf_prog_run_clear_cb include/linux/filter.h:721 [inline] run_filter net/packet/af_packet.c:2012 [inline] packet_rcv+0x70f/0x2160 net/packet/af_packet.c:2085 deliver_skb net/core/dev.c:2168 [inline] __netif_receive_skb_core+0xdd2/0x5870 net/core/dev.c:5046 __netif_receive_skb_one_core net/core/dev.c:5186 [inline] __netif_receive_skb net/core/dev.c:5302 [inline] netif_receive_skb_internal net/core/dev.c:5392 [inline] netif_receive_skb+0x551/0xf20 net/core/dev.c:5451 tun_rx_batched drivers/net/tun.c:1516 [inline] tun_get_user+0x6d60/0x71e0 drivers/net/tun.c:1963 tun_chr_write_iter+0x1f2/0x360 drivers/net/tun.c:1992 call_write_iter include/linux/fs.h:1907 [inline] new_sync_write fs/read_write.c:484 [inline] __vfs_write+0xa5a/0xca0 fs/read_write.c:497 vfs_write+0x444/0x8e0 fs/read_write.c:559 ksys_write+0x267/0x450 fs/read_write.c:612 __do_sys_write fs/read_write.c:624 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:621 __x64_sys_write+0x4a/0x70 fs/read_write.c:621 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416561 Code: 75 14 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 c4 1b 00 00 c3 48 83 ec 08 e8 ca fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 13 fd ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fbb7ff0ec60 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000507dc0 RCX: 0000000000416561 RDX: 000000000000004a RSI: 0000000020000040 RDI: 00000000000000f0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000bbe R14: 00000000004ce06b R15: 00007fbb7ff0f6d4 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165 ___bpf_prog_run+0x6c64/0x97a0 kernel/bpf/core.c:1391 __bpf_prog_run32+0x101/0x170 kernel/bpf/core.c:1681 bpf_dispatcher_nop_func include/linux/bpf.h:545 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:599 [inline] bpf_prog_run_clear_cb include/linux/filter.h:721 [inline] run_filter net/packet/af_packet.c:2012 [inline] packet_rcv+0x70f/0x2160 net/packet/af_packet.c:2085 deliver_skb net/core/dev.c:2168 [inline] __netif_receive_skb_core+0xdd2/0x5870 net/core/dev.c:5046 __netif_receive_skb_one_core net/core/dev.c:5186 [inline] __netif_receive_skb net/core/dev.c:5302 [inline] netif_receive_skb_internal net/core/dev.c:5392 [inline] netif_receive_skb+0x551/0xf20 net/core/dev.c:5451 tun_rx_batched drivers/net/tun.c:1516 [inline] tun_get_user+0x6d60/0x71e0 drivers/net/tun.c:1963 tun_chr_write_iter+0x1f2/0x360 drivers/net/tun.c:1992 call_write_iter include/linux/fs.h:1907 [inline] new_sync_write fs/read_write.c:484 [inline] __vfs_write+0xa5a/0xca0 fs/read_write.c:497 vfs_write+0x444/0x8e0 fs/read_write.c:559 ksys_write+0x267/0x450 fs/read_write.c:612 __do_sys_write fs/read_write.c:624 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:621 __x64_sys_write+0x4a/0x70 fs/read_write.c:621 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Local variable ----regs@__bpf_prog_run32 created at: __bpf_prog_run32+0x87/0x170 kernel/bpf/core.c:1681 __bpf_prog_run32+0x87/0x170 kernel/bpf/core.c:1681 =====================================================