Messages in this thread | | | From | Eric Dumazet <> | Date | Thu, 7 Dec 2023 15:19:45 +0100 | Subject | Re: KMSAN: uninit-value in ip_tunnel_xmit |
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On Thu, Dec 7, 2023 at 2:27 PM xingwei lee <xrivendell7@gmail.com> wrote: > > Hello, > > When fuzzing the latest upstream linux 6.7-rc4, the following crash > was triggered. > HEAD commit: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8 > > If you fix this issue, please add the following tag to the commit: > Reported-by: xingwei Lee <xrivendell7@gmail.com> > > console_log: https://gist.github.com/xrivendell7/b41fbc928cd203823783fd90c98b6583#file-console_log > report: https://gist.github.com/xrivendell7/b41fbc928cd203823783fd90c98b6583#file-report > kernel commit: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8 > kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=ce27066613dacbb6 > repro.c: https://gist.github.com/xrivendell7/b41fbc928cd203823783fd90c98b6583#file-repro-c > repro.txt: https://gist.github.com/xrivendell7/b41fbc928cd203823783fd90c98b6583#file-repro-txt > > In the lasted kernel: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8 the > [ 199.471467][ T8590] ===================================================== > [ 199.475015][ T8590] BUG: KMSAN: uninit-value in ip_tunnel_xmit+0x857/0x3e80 > [ 199.478180][ T8590] ip_tunnel_xmit+0x857/0x3e80 > [ 199.480541][ T8590] ipgre_xmit+0xd1c/0xe20 > [ 199.482393][ T8590] dev_hard_start_xmit+0x247/0xa10 > [ 199.484530][ T8590] __dev_queue_xmit+0x33b8/0x5130 > [ 199.486433][ T8590] __bpf_redirect+0xdd7/0x1600 > [ 199.488258][ T8590] bpf_clone_redirect+0x328/0x470 > [ 199.490250][ T8590] ___bpf_prog_run+0x2180/0xdb80 > [ 199.491997][ T8590] __bpf_prog_run512+0xb5/0xe0 > [ 199.493691][ T8590] bpf_test_run+0x482/0xb00 > [ 199.495215][ T8590] bpf_prog_test_run_skb+0x14e5/0x1f20 > [ 199.497026][ T8590] bpf_prog_test_run+0x6af/0xac0 > [ 199.498701][ T8590] __sys_bpf+0x649/0xd60 > [ 199.500029][ T8590] __x64_sys_bpf+0xa0/0xe0 > [ 199.501411][ T8590] do_syscall_64+0x44/0x110 > [ 199.502757][ T8590] entry_SYSCALL_64_after_hwframe+0x63/0x6b > [ 199.504463][ T8590] > [ 199.505159][ T8590] Uninit was created at: > [ 199.506344][ T8590] slab_post_alloc_hook+0x129/0xa70 > [ 199.507690][ T8590] kmem_cache_alloc_node+0x5e9/0xb10 > [ 199.509191][ T8590] kmalloc_reserve+0x13d/0x4a0 > [ 199.510411][ T8590] pskb_expand_head+0x226/0x1a00 > [ 199.511657][ T8590] skb_ensure_writable+0x3d3/0x460 > [ 199.512905][ T8590] bpf_clone_redirect+0x17f/0x470 > [ 199.514135][ T8590] ___bpf_prog_run+0x2180/0xdb80 > [ 199.515325][ T8590] __bpf_prog_run512+0xb5/0xe0 > [ 199.516479][ T8590] bpf_test_run+0x482/0xb00 > [ 199.517580][ T8590] bpf_prog_test_run_skb+0x14e5/0x1f20 > [ 199.518901][ T8590] bpf_prog_test_run+0x6af/0xac0 > [ 199.520015][ T8590] __sys_bpf+0x649/0xd60 > [ 199.520996][ T8590] __x64_sys_bpf+0xa0/0xe0 > [ 199.521949][ T8590] do_syscall_64+0x44/0x110 > [ 199.522926][ T8590] entry_SYSCALL_64_after_hwframe+0x63/0x6b > > and I notice the problem is reported at 2018/2020 and seems fixed twice. > > https://syzkaller.appspot.com/bug?id=f62d236e2fceaeb104f4e8f77d2324ef9da4b41b > https://syzkaller.appspot.com/bug?extid=4a2c52677a8a1aa283cb > > > > If you fix this issue, please add the following tag to the commit: > Reported-by: Yikebaer Aizezi <yikebaer61@gmail.com>
I think a fix was merged into the net tree yesterday, please double check.
80d875cfc9d3711a029f234ef7d680db79e8fa4b ipv4: ip_gre: Avoid skb_pull() failure in ipgre_xmit()
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