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From: 慕冬亮 <mudongliangabcd@gmail.com>
To: andriin@fb.com, ast@kernel.org, bpf@vger.kernel.org,
	Daniel Borkmann <daniel@iogearbox.net>,
	davem@davemloft.net, hawk@kernel.org, john.fastabend@gmail.com,
	kafai@fb.com, kpsingh@chromium.org, kuba@kernel.org,
	linux-kernel <linux-kernel@vger.kernel.org>,
	mingo@redhat.com, netdev@vger.kernel.org, rostedt@goodmis.org,
	songliubraving@fb.com, yhs@fb.com,
	Dmitry Vyukov <dvyukov@google.com>
Subject: "KASAN: vmalloc-out-of-bounds Read in bpf_trace_run1/2/3/5" and "BUG: unable to handle kernel paging request in bpf_trace_run1/2/3/4" should share the same root cause
Date: Wed, 13 Jan 2021 17:11:39 +0800
Message-ID: <CAD-N9QWcdR5oxt2JJrEowPwddyNTZVfU5iSOXNV+cTy2+TKnuQ@mail.gmail.com> (raw)

Hi developers,

I found the following cases should share the same root cause:

BUG: unable to handle kernel paging request in bpf_trace_run1
BUG: unable to handle kernel paging request in bpf_trace_run2
BUG: unable to handle kernel paging request in bpf_trace_run3
BUG: unable to handle kernel paging request in bpf_trace_run4
KASAN: vmalloc-out-of-bounds Read in bpf_trace_run1
KASAN: vmalloc-out-of-bounds Read in bpf_trace_run2
KASAN: vmalloc-out-of-bounds Read in bpf_trace_run3
KASAN: vmalloc-out-of-bounds Read in bpf_trace_run5

The PoCs after minimization are almost the same except for the
different tracepoint arguments.
And the difference for "bpf_trace_run1/2/3/4/5" is due to the
corresponding tracepoints -
"ext4_mballoc_alloc"/"sys_enter"/"sched_switch"/"ext4_ext_show_extent"/"ext4_journal_start".

The underlying reason for those cases is the allocation failure in the
following trace:

tracepoint_probe_unregister
    tracepoint_remove_func
        func_remove
             allocate_probes
                 kmalloc

--
My best regards to you.

     No System Is Safe!
     Dongliang Mu

                 reply index

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