===================================================== BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in copy_to_user_iter lib/iov_iter.c:24 [inline] BUG: KMSAN: kernel-infoleak in iterate_ubuf include/linux/iov_iter.h:29 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:245 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:271 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x366/0x2520 lib/iov_iter.c:185 instrument_copy_to_user include/linux/instrumented.h:114 [inline] copy_to_user_iter lib/iov_iter.c:24 [inline] iterate_ubuf include/linux/iov_iter.h:29 [inline] iterate_and_advance2 include/linux/iov_iter.h:245 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] _copy_to_iter+0x366/0x2520 lib/iov_iter.c:185 copy_to_iter include/linux/uio.h:196 [inline] simple_copy_to_iter net/core/datagram.c:532 [inline] __skb_datagram_iter+0x185/0x1000 net/core/datagram.c:420 skb_copy_datagram_iter+0x5c/0x200 net/core/datagram.c:546 tun_put_user drivers/net/tun.c:2164 [inline] tun_do_read+0x21fc/0x2be0 drivers/net/tun.c:2243 tun_chr_read_iter+0x3f0/0x670 drivers/net/tun.c:2267 call_read_iter include/linux/fs.h:2104 [inline] new_sync_read fs/read_write.c:395 [inline] vfs_read+0xda3/0xef0 fs/read_write.c:476 ksys_read+0x20f/0x4c0 fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __ia32_sys_read+0x91/0xe0 fs/read_write.c:627 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xba/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:346 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384 entry_SYSENTER_compat_after_hwframe+0x7f/0x89 Uninit was stored to memory at: pskb_expand_head+0x30f/0x19d0 net/core/skbuff.c:2253 __skb_cow include/linux/skbuff.h:3676 [inline] skb_cow_head include/linux/skbuff.h:3710 [inline] erspan_xmit+0xb08/0x1ec0 net/ipv4/ip_gre.c:697 __netdev_start_xmit include/linux/netdevice.h:4903 [inline] netdev_start_xmit include/linux/netdevice.h:4917 [inline] xmit_one net/core/dev.c:3531 [inline] dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547 sch_direct_xmit+0x3c5/0xd50 net/sched/sch_generic.c:343 __dev_xmit_skb net/core/dev.c:3760 [inline] __dev_queue_xmit+0x2e6a/0x52c0 net/core/dev.c:4301 dev_queue_xmit include/linux/netdevice.h:3091 [inline] neigh_resolve_output+0x9c9/0xae0 net/core/neighbour.c:1563 neigh_output include/net/neighbour.h:542 [inline] ip_finish_output2+0x1907/0x1b70 net/ipv4/ip_output.c:235 __ip_finish_output+0x287/0x810 ip_finish_output+0x4b/0x550 net/ipv4/ip_output.c:323 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:433 dst_output include/net/dst.h:450 [inline] ip_local_out net/ipv4/ip_output.c:129 [inline] ip_send_skb+0x329/0x3c0 net/ipv4/ip_output.c:1492 udp_send_skb+0x1062/0x1b50 net/ipv4/udp.c:968 udp_sendmsg+0x2f06/0x3200 net/ipv4/udp.c:1255 udpv6_sendmsg+0x1520/0x3fb0 net/ipv6/udp.c:1388 inet6_sendmsg+0x1fc/0x280 net/ipv6/af_inet6.c:661 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x143/0x380 net/socket.c:745 ____sys_sendmsg+0x903/0xb60 net/socket.c:2584 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638 __sys_sendmmsg+0x4e2/0x950 net/socket.c:2717 __compat_sys_sendmmsg net/compat.c:360 [inline] __do_compat_sys_sendmmsg net/compat.c:367 [inline] __se_compat_sys_sendmmsg net/compat.c:364 [inline] __ia32_compat_sys_sendmmsg+0xc8/0x140 net/compat.c:364 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xba/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:346 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384 entry_SYSENTER_compat_after_hwframe+0x7f/0x89 Uninit was created at: slab_post_alloc_hook mm/slub.c:3804 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577 __alloc_skb+0x35b/0x7a0 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1313 [inline] alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504 sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795 sock_alloc_send_skb include/net/sock.h:1842 [inline] __ip_append_data+0x4c66/0x6960 net/ipv4/ip_output.c:1122 ip_make_skb+0x1d3/0x620 net/ipv4/ip_output.c:1558 udp_sendmsg+0x2db7/0x3200 net/ipv4/udp.c:1250 udpv6_sendmsg+0x1520/0x3fb0 net/ipv6/udp.c:1388 inet6_sendmsg+0x1fc/0x280 net/ipv6/af_inet6.c:661 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x143/0x380 net/socket.c:745 ____sys_sendmsg+0x903/0xb60 net/socket.c:2584 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638 __sys_sendmmsg+0x4e2/0x950 net/socket.c:2717 __compat_sys_sendmmsg net/compat.c:360 [inline] __do_compat_sys_sendmmsg net/compat.c:367 [inline] __se_compat_sys_sendmmsg net/compat.c:364 [inline] __ia32_compat_sys_sendmmsg+0xc8/0x140 net/compat.c:364 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xba/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:346 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384 entry_SYSENTER_compat_after_hwframe+0x7f/0x89 Bytes 38-41 of 92 are uninitialized Memory access of size 92 starts at ffff888046f0c300 Data copied to user address 00000000f5e531c8 CPU: 0 PID: 9903 Comm: syz-executor.1 Tainted: G W 6.9.0-rc2-syzkaller-00413-gf2f80ac80987 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 =====================================================