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

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Message-ID: <CANpmjNPxLgosrY=CH9GpwHmOKFbCuPQfLBFS+QBZGKiQC-od9w@mail.gmail.com>
Date:   Tue, 8 Feb 2022 14:39:34 +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 5/5] kasan: no need to unset panic_on_warn in end_report()

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 end_report().
>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>

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


> ---
>  mm/kasan/report.c | 10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
>
> diff --git a/mm/kasan/report.c b/mm/kasan/report.c
> index 3ad9624..f141465 100644
> --- a/mm/kasan/report.c
> +++ b/mm/kasan/report.c
> @@ -117,16 +117,8 @@ static void end_report(unsigned long *flags, unsigned long addr)
>         pr_err("==================================================================\n");
>         add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
>         spin_unlock_irqrestore(&report_lock, *flags);
> -       if (panic_on_warn && !test_bit(KASAN_BIT_MULTI_SHOT, &kasan_flags)) {
> -               /*
> -                * 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 && !test_bit(KASAN_BIT_MULTI_SHOT, &kasan_flags))
>                 panic("panic_on_warn set ...\n");
> -       }
>         if (kasan_arg_fault == KASAN_ARG_FAULT_PANIC)
>                 panic("kasan.fault=panic set ...\n");
>         kasan_enable_current();
> --
> 2.1.0
>
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