KMSAN: uninit-value in __xfrm_decode

Kernel	Title	Repro	Count	Last	Reported	Patched	Status
upstream	KMSAN: uninit-value in __xfrm_decode_session (2) net		6	1341d	1416d	0/25	auto-closed as invalid on 2020/04/24 09:27
upstream	KASAN: slab-out-of-bounds Read in __xfrm_decode_session (2) net		7	661d	897d	0/25	auto-closed as invalid on 2022/04/04 17:22
upstream	KMSAN: kernel-infoleak in copyout (2) net	C	6723	111d	1280d	24/25	fixed on 2023/06/08 14:41
upstream	KMSAN: kernel-infoleak in _copy_to_iter (7) net	C	138977	215d	567d	24/25	fixed on 2023/02/24 13:50
upstream	KMSAN: uninit-value in __xfrm_decode_session (3) net		1	1162d	1162d	0/25	auto-closed as invalid on 2020/10/20 16:12

===================================================== BUG: KMSAN: uninit-value in vti6_tnl_xmit+0x85a/0x27a0 net/ipv6/ip6_vti.c:531 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc7+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x13a/0x2b0 mm/kmsan/kmsan_report.c:108 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250 decode_session6 net/xfrm/xfrm_policy.c:3405 [inline] __xfrm_decode_session+0x18ec/0x33e0 net/xfrm/xfrm_policy.c:3480 vti6_tnl_xmit+0x85a/0x27a0 net/ipv6/ip6_vti.c:531 __netdev_start_xmit include/linux/netdevice.h:4406 [inline] netdev_start_xmit include/linux/netdevice.h:4420 [inline] xmit_one net/core/dev.c:3280 [inline] dev_hard_start_xmit+0x51a/0xab0 net/core/dev.c:3296 sch_direct_xmit+0x56c/0x18c0 net/sched/sch_generic.c:309 qdisc_restart net/sched/sch_generic.c:372 [inline] __qdisc_run+0x1575/0x33b0 net/sched/sch_generic.c:380 __dev_xmit_skb net/core/dev.c:3533 [inline] __dev_queue_xmit+0x2377/0x4270 net/core/dev.c:3838 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3902 neigh_direct_output+0x42/0x50 net/core/neighbour.c:1530 neigh_output include/net/neighbour.h:511 [inline] ip6_finish_output2+0x2129/0x2670 net/ipv6/ip6_output.c:116 __ip6_finish_output+0x83d/0x8f0 net/ipv6/ip6_output.c:142 ip6_finish_output+0x2db/0x420 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x5d3/0x720 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ndisc_send_skb+0x1083/0x15e0 net/ipv6/ndisc.c:504 ndisc_send_rs+0xb5d/0xb90 net/ipv6/ndisc.c:698 addrconf_rs_timer+0x847/0xc20 net/ipv6/addrconf.c:3879 call_timer_fn+0x232/0x530 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers+0xcdc/0x11a0 kernel/time/timer.c:1685 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1698 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:537 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837 </IRQ> RIP: 0010:default_idle+0x53/0x90 arch/x86/kernel/process.c:581 Code: 13 ee eb f2 44 8b 35 94 79 d2 01 48 c7 c7 78 d5 25 90 e8 d0 9b b1 f3 83 38 00 75 31 45 85 f6 7e 07 0f 00 2d 8f f3 4d 00 fb f4 <65> 8b 35 2e 57 af 71 c7 03 00 00 00 00 c7 43 08 00 00 00 00 bf ff RSP: 0018:ffffffff8f60fda0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff888217c47578 RBX: ffffffff8f638b60 RCX: ccccccccccccd000 RDX: ffff888207e40578 RSI: ffffea000a76d630 RDI: 000000001025d578 RBP: ffffffff8f60fdb0 R08: 0000000000000000 R09: ffff88821f4a91c2 R10: 0000000000000004 R11: ffffffff8e535bb0 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8f638b60 arch_cpu_idle+0x25/0x30 arch/x86/kernel/process.c:571 default_idle_call kernel/sched/idle.c:94 [inline] cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x1d7/0x790 kernel/sched/idle.c:263 cpu_startup_entry+0x45/0x50 kernel/sched/idle.c:354 rest_init+0x1be/0x1f0 init/main.c:452 arch_call_rest_init+0x13/0x15 start_kernel+0x991/0xb61 init/main.c:788 x86_64_start_reservations+0x18/0x2e arch/x86/kernel/head64.c:472 x86_64_start_kernel+0x81/0x84 arch/x86/kernel/head64.c:453 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:150 [inline] kmsan_internal_poison_shadow+0x53/0x100 mm/kmsan/kmsan.c:134 kmsan_slab_free+0x8d/0x100 mm/kmsan/kmsan_hooks.c:123 slab_free_freelist_hook mm/slub.c:1472 [inline] slab_free mm/slub.c:3038 [inline] kfree+0x4c1/0x2db0 mm/slub.c:3980 skb_free_head net/core/skbuff.c:591 [inline] skb_release_data+0x7de/0x9d0 net/core/skbuff.c:611 skb_release_all net/core/skbuff.c:665 [inline] __kfree_skb net/core/skbuff.c:679 [inline] kfree_skb+0x322/0x4c0 net/core/skbuff.c:697 netlink_sock_destruct+0x15b/0x460 net/netlink/af_netlink.c:391 __sk_destruct+0x8c/0x890 net/core/sock.c:1695 sk_destruct net/core/sock.c:1734 [inline] __sk_free+0x5af/0x640 net/core/sock.c:1745 sk_free+0x6c/0x90 net/core/sock.c:1756 deferred_put_nlk_sk+0x2bb/0x340 net/netlink/af_netlink.c:729 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch kernel/rcu/tree.c:2114 [inline] rcu_core+0xb6f/0x1850 kernel/rcu/tree.c:2314 rcu_core_si+0xe/0x10 kernel/rcu/tree.c:2323 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:537 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837 __nr_to_section include/linux/mmzone.h:1234 [inline] pfn_valid include/linux/mmzone.h:1344 [inline] my_virt_addr_valid mm/kmsan/kmsan_shadow.c:97 [inline] kmsan_get_shadow_origin_ptr+0x17b/0x4c0 mm/kmsan/kmsan_shadow.c:179 __msan_metadata_ptr_for_load_8+0x10/0x20 mm/kmsan/kmsan_instr.c:55 vm_normal_page mm/memory.c:617 [inline] zap_pte_range mm/memory.c:1033 [inline] zap_pmd_range mm/memory.c:1162 [inline] zap_pud_range mm/memory.c:1191 [inline] zap_p4d_range mm/memory.c:1212 [inline] unmap_page_range+0xf54/0x3f60 mm/memory.c:1233 unmap_single_vma+0x43f/0x5e0 mm/memory.c:1278 unmap_vmas+0x391/0x4b0 mm/memory.c:1310 exit_mmap+0x50e/0xa00 mm/mmap.c:3145 __mmput+0x148/0x590 kernel/fork.c:1066 mmput+0x83/0x90 kernel/fork.c:1087 exit_mm+0x6b7/0x770 kernel/exit.c:548 do_exit+0xb12/0x3aa0 kernel/exit.c:868 do_group_exit+0x18a/0x320 kernel/exit.c:985 get_signal+0xbf6/0x32f0 kernel/signal.c:2734 do_signal+0x6f/0xe10 arch/x86/kernel/signal.c:815 exit_to_usermode_loop arch/x86/entry/common.c:159 [inline] prepare_exit_to_usermode+0x2c5/0x4d0 arch/x86/entry/common.c:194 syscall_return_slowpath+0x90/0x610 arch/x86/entry/common.c:274 do_syscall_64+0xe2/0xf0 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x63/0xe7 =====================================================