Messages in this thread | | | Date | Tue, 09 Apr 2024 17:22:02 -0700 | Subject | Re: [syzbot] [bpf?] KMSAN: uninit-value in strnchr | From | syzbot <> |
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Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue: KMSAN: uninit-value in strnchrnul
===================================================== BUG: KMSAN: uninit-value in strnchrnul+0xb5/0xf0 lib/string.c:352 strnchrnul+0xb5/0xf0 lib/string.c:352 bpf_bprintf_prepare+0x1c2/0x23b0 kernel/bpf/helpers.c:829 ____bpf_trace_printk kernel/trace/bpf_trace.c:385 [inline] bpf_trace_printk+0xec/0x3e0 kernel/trace/bpf_trace.c:375 ___bpf_prog_run+0x2180/0xdb80 kernel/bpf/core.c:1986 __bpf_prog_run32+0xb2/0xe0 kernel/bpf/core.c:2225 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_test_run+0x482/0xaf0 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0x14e5/0x1f20 net/bpf/test_run.c:1056 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_run32+0x43/0xe0 kernel/bpf/core.c:2225 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_test_run+0x482/0xaf0 net/bpf/test_run.c:423
CPU: 0 PID: 5507 Comm: syz-executor.0 Not tainted 6.8.0-rc6-syzkaller-00250-g04b8076df253-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 =====================================================
Tested on:
commit: 04b8076d Merge tag 'firewire-fixes-6.8-rc7' of git://g.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=1470b105180000 kernel config: https://syzkaller.appspot.com/x/.config?x=80c7a82a572c0de3 dashboard link: https://syzkaller.appspot.com/bug?extid=9b8be5e35747291236c8 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=112caf9d180000
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