Messages in this thread | | | Date | Mon, 8 Apr 2024 22:33:24 -0700 | Subject | Re: [syzbot] [bpf?] KMSAN: uninit-value in bstr_printf | From | Martin KaFai Lau <> |
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On 2/21/24 12:55 PM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: c1ca10ceffbb Merge tag 'scsi-fixes' of git://git.kernel.or.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=10e7f5f0180000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e3dd779fba027968 > dashboard link: https://syzkaller.appspot.com/bug?extid=f0d29b273acdcd3a2562 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/83d019f0ac47/disk-c1ca10ce.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/49e05dd7a23d/vmlinux-c1ca10ce.xz > kernel image: https://storage.googleapis.com/syzbot-assets/68ec9fa2d33d/bzImage-c1ca10ce.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+f0d29b273acdcd3a2562@syzkaller.appspotmail.com > > ===================================================== > BUG: KMSAN: uninit-value in bstr_printf+0x19df/0x1b50 lib/vsprintf.c:3334 > bstr_printf+0x19df/0x1b50 lib/vsprintf.c:3334 > ____bpf_snprintf kernel/bpf/helpers.c:1064 [inline] > bpf_snprintf+0x1c8/0x360 kernel/bpf/helpers.c:1044 > ___bpf_prog_run+0x2180/0xdb80 kernel/bpf/core.c:1986 > __bpf_prog_run288+0xb5/0xe0 kernel/bpf/core.c:2226
#syz dup: [syzbot] [bpf?] [net?] KMSAN: uninit-value in dev_map_lookup_elem
> bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline] > __bpf_prog_run include/linux/filter.h:651 [inline] > bpf_prog_run include/linux/filter.h:658 [inline] > bpf_prog_run_pin_on_cpu include/linux/filter.h:675 [inline] > bpf_flow_dissect+0x127/0x470 net/core/flow_dissector.c:991 > bpf_prog_test_run_flow_dissector+0x6f4/0xa20 net/bpf/test_run.c:1359 > bpf_prog_test_run+0x6af/0xac0 kernel/bpf/syscall.c:4107 > __sys_bpf+0x649/0xd60 kernel/bpf/syscall.c:5475 > __do_sys_bpf kernel/bpf/syscall.c:5561 [inline] > __se_sys_bpf kernel/bpf/syscall.c:5559 [inline] > __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5559 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x63/0x6b > > Uninit was stored to memory at: > bpf_bprintf_prepare+0x138d/0x23b0 kernel/bpf/helpers.c:1027 > ____bpf_snprintf kernel/bpf/helpers.c:1060 [inline] > bpf_snprintf+0x141/0x360 kernel/bpf/helpers.c:1044 > ___bpf_prog_run+0x2180/0xdb80 kernel/bpf/core.c:1986 > __bpf_prog_run288+0xb5/0xe0 kernel/bpf/core.c:2226 > bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline] > __bpf_prog_run include/linux/filter.h:651 [inline] > bpf_prog_run include/linux/filter.h:658 [inline] > bpf_prog_run_pin_on_cpu include/linux/filter.h:675 [inline] > bpf_flow_dissect+0x127/0x470 net/core/flow_dissector.c:991 > bpf_prog_test_run_flow_dissector+0x6f4/0xa20 net/bpf/test_run.c:1359 > bpf_prog_test_run+0x6af/0xac0 kernel/bpf/syscall.c:4107 > __sys_bpf+0x649/0xd60 kernel/bpf/syscall.c:5475 > __do_sys_bpf kernel/bpf/syscall.c:5561 [inline] > __se_sys_bpf kernel/bpf/syscall.c:5559 [inline] > __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5559 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x63/0x6b > > Local variable stack created at: > __bpf_prog_run288+0x45/0xe0 kernel/bpf/core.c:2226 > bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline] > __bpf_prog_run include/linux/filter.h:651 [inline] > bpf_prog_run include/linux/filter.h:658 [inline] > bpf_prog_run_pin_on_cpu include/linux/filter.h:675 [inline] > bpf_flow_dissect+0x127/0x470 net/core/flow_dissector.c:991 > > CPU: 1 PID: 8904 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-00331-gc1ca10ceffbb #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 > =====================================================
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