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Message-ID: <000000000000205af206143ece22@google.com> Date: Fri, 22 Mar 2024 05:17:19 -0700 From: syzbot <syzbot+9e27778c0edc62cb97d8@...kaller.appspotmail.com> To: davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [net?] KMSAN: uninit-value in erspan_build_header (2) Hello, syzbot found the following issue on: HEAD commit: a4145ce1e7bc Merge tag 'bcachefs-2024-03-19' of https://ev.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=154a06a5180000 kernel config: https://syzkaller.appspot.com/x/.config?x=5c1d7ee7e74661a8 dashboard link: https://syzkaller.appspot.com/bug?extid=9e27778c0edc62cb97d8 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1126e1a5180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c14e31180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ce90c7e9c4b9/disk-a4145ce1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/fc2e82754c55/vmlinux-a4145ce1.xz kernel image: https://storage.googleapis.com/syzbot-assets/dfc8b656ea07/bzImage-a4145ce1.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9e27778c0edc62cb97d8@...kaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in erspan_build_header+0x170/0x2f0 include/net/erspan.h:197 erspan_build_header+0x170/0x2f0 include/net/erspan.h:197 erspan_xmit+0x128a/0x1ec0 net/ipv4/ip_gre.c:706 __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] __bpf_tx_skb net/core/filter.c:2136 [inline] __bpf_redirect_common net/core/filter.c:2180 [inline] __bpf_redirect+0x14a6/0x1620 net/core/filter.c:2187 ____bpf_clone_redirect net/core/filter.c:2460 [inline] bpf_clone_redirect+0x328/0x470 net/core/filter.c:2432 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997 __bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2238 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] bpf_test_run+0x499/0xc30 net/bpf/test_run.c:425 bpf_prog_test_run_skb+0x14ea/0x1f20 net/bpf/test_run.c:1058 bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4240 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5649 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline] __se_sys_bpf kernel/bpf/syscall.c:5736 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5736 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 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 pskb_expand_head+0x222/0x19d0 net/core/skbuff.c:2245 __skb_cow include/linux/skbuff.h:3671 [inline] skb_cow_head include/linux/skbuff.h:3705 [inline] erspan_xmit+0xb08/0x1ec0 net/ipv4/ip_gre.c:692 __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] __bpf_tx_skb net/core/filter.c:2136 [inline] __bpf_redirect_common net/core/filter.c:2180 [inline] __bpf_redirect+0x14a6/0x1620 net/core/filter.c:2187 ____bpf_clone_redirect net/core/filter.c:2460 [inline] bpf_clone_redirect+0x328/0x470 net/core/filter.c:2432 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997 __bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2238 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] bpf_test_run+0x499/0xc30 net/bpf/test_run.c:425 bpf_prog_test_run_skb+0x14ea/0x1f20 net/bpf/test_run.c:1058 bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4240 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5649 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline] __se_sys_bpf kernel/bpf/syscall.c:5736 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5736 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 CPU: 0 PID: 5041 Comm: syz-executor167 Not tainted 6.8.0-syzkaller-11743-ga4145ce1e7bc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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