linux-kernel - Re: [PATCH bpf v4 1/3] bpf_trace: check size for overflow in bpf_kprobe_multi_link

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Date:   Thu, 19 May 2022 12:22:42 -0700
From:   Yonghong Song <yhs@...com>
To:     Eugene Syromiatnikov <esyr@...hat.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf v4 1/3] bpf_trace: check size for overflow in
 bpf_kprobe_multi_link_attach



On 5/19/22 11:14 AM, Eugene Syromiatnikov wrote:
> Check that size would not overflow before calculation (and return
> -EOVERFLOW if it will), to prevent potential out-of-bounds write
> with the following copy_from_user.  Add the same check
> to kprobe_multi_resolve_syms in case it will be called from elsewhere
> in the future.  The INT_MAX checks are performed in order to avoid
> triggering kvmalloc_node warning [1].
> 
> [1] https://lore.kernel.org/lkml/cfe6abea-8d00-8f8c-f84c-e6f27753b5d1@fb.com/
> 
> Fixes: 0dcac272540613d4 ("bpf: Add multi kprobe link")
> Signed-off-by: Eugene Syromiatnikov <esyr@...hat.com>

Acked-by: Yonghong Song <yhs@...com>