===================================================== 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:30 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:300 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:328 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0xf0e/0x32f0 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:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:300 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] _copy_to_iter+0xf0e/0x32f0 lib/iov_iter.c:185 copy_to_iter include/linux/uio.h:220 [inline] simple_copy_to_iter net/core/datagram.c:524 [inline] __skb_datagram_iter+0x18f/0x1250 net/core/datagram.c:401 skb_copy_datagram_iter+0x5b/0x1e0 net/core/datagram.c:538 skb_copy_datagram_msg include/linux/skbuff.h:4128 [inline] packet_recvmsg+0xe2b/0x24e0 net/packet/af_packet.c:3526 sock_recvmsg_nosec net/socket.c:1017 [inline] sock_recvmsg+0x2dc/0x390 net/socket.c:1039 __sys_recvfrom+0x282/0x550 net/socket.c:2230 __compat_sys_recvfrom net/compat.c:389 [inline] __do_compat_sys_recvfrom net/compat.c:402 [inline] __se_compat_sys_recvfrom net/compat.c:398 [inline] __ia32_compat_sys_recvfrom+0x13b/0x210 net/compat.c:398 ia32_sys_call+0x2968/0x42c0 arch/x86/include/generated/asm/syscalls_32.h:372 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Uninit was stored to memory at: pskb_expand_head+0x313/0x1c90 net/core/skbuff.c:2255 __pskb_pull_tail+0x1b7/0x2560 net/core/skbuff.c:2815 skb_cow_data+0x3b3/0x1370 net/core/skbuff.c:5256 tipc_aead_encrypt net/tipc/crypto.c:764 [inline] tipc_crypto_xmit+0x1e93/0x3a40 net/tipc/crypto.c:1756 tipc_crypto_clone_msg+0x110/0x260 net/tipc/crypto.c:1651 tipc_crypto_xmit+0x3997/0x3a40 net/tipc/crypto.c:1712 tipc_bearer_xmit_skb+0x302/0x4b0 net/tipc/bearer.c:572 tipc_disc_timeout+0x93c/0xa40 net/tipc/discover.c:338 call_timer_fn+0x49/0x520 kernel/time/timer.c:1789 expire_timers kernel/time/timer.c:1840 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x80f/0xd90 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0x3a/0x80 kernel/time/timer.c:2445 handle_softirqs+0x166/0x6e0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0x66/0x180 kernel/softirq.c:680 irq_exit_rcu+0x12/0x20 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x84/0x90 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702 Uninit was created at: slab_post_alloc_hook mm/slub.c:4167 [inline] slab_alloc_node mm/slub.c:4210 [inline] kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4262 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:577 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:668 alloc_skb_fclone include/linux/skbuff.h:1390 [inline] tipc_buf_acquire+0x4c/0x230 net/tipc/msg.c:72 tipc_disc_create+0x12f/0x870 net/tipc/discover.c:359 tipc_enable_bearer net/tipc/bearer.c:348 [inline] __tipc_nl_bearer_enable+0x1f61/0x2a00 net/tipc/bearer.c:1047 tipc_nl_bearer_enable+0x3d/0x70 net/tipc/bearer.c:1056 genl_family_rcv_msg_doit+0x335/0x3f0 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0xacf/0xc10 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x54a/0x680 net/netlink/af_netlink.c:2534 genl_rcv+0x41/0x60 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0xed5/0x1290 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x10b3/0x1250 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2566 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620 __sys_sendmsg+0x1aa/0x300 net/socket.c:2652 __compat_sys_sendmsg net/compat.c:346 [inline] __do_compat_sys_sendmsg net/compat.c:353 [inline] __se_compat_sys_sendmsg net/compat.c:350 [inline] __ia32_compat_sys_sendmsg+0xa4/0x100 net/compat.c:350 ia32_sys_call+0x3692/0x42c0 arch/x86/include/generated/asm/syscalls_32.h:371 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Bytes 4-5 of 164 are uninitialized Memory access of size 164 starts at ffff8880581b2448 Data copied to user address 000000008000058a CPU: 0 UID: 0 PID: 31146 Comm: syz.9.9217 Tainted: G W 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(undef) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 =====================================================