linux-kernel - Re: [PATCH v2 4/5] ubsan: no need to unset panic_on_warn in ubsan

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Date:   Tue, 8 Feb 2022 14:39:05 +0100
From:   Marco Elver <elver@...gle.com>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Baoquan He <bhe@...hat.com>, Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Xuefeng Li <lixuefeng@...ngson.cn>, kexec@...ts.infradead.org,
        linux-doc@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/5] ubsan: no need to unset panic_on_warn in ubsan_epilogue()

On Tue, 8 Feb 2022 at 13:51, Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
>
> panic_on_warn is unset inside panic(), so no need to unset it
> before calling panic() in ubsan_epilogue().
>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>

Reviewed-by: Marco Elver <elver@...gle.com>


> ---
>  lib/ubsan.c | 10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
>
> diff --git a/lib/ubsan.c b/lib/ubsan.c
> index bdc380f..36bd75e 100644
> --- a/lib/ubsan.c
> +++ b/lib/ubsan.c
> @@ -154,16 +154,8 @@ static void ubsan_epilogue(void)
>
>         current->in_ubsan--;
>
> -       if (panic_on_warn) {
> -               /*
> -                * This thread may hit another WARN() in the panic path.
> -                * Resetting this prevents additional WARN() from panicking the
> -                * system on this thread.  Other threads are blocked by the
> -                * panic_mutex in panic().
> -                */
> -               panic_on_warn = 0;
> +       if (panic_on_warn)
>                 panic("panic_on_warn set ...\n");
> -       }
>  }
>
>  void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs)
> --
> 2.1.0
>
> --
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