linux-kernel - Re: [PATCH V4] notifier/panic: Introduce panic_notifier

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Message-ID: <TYAPR01MB6507D06BA6D32218F6E88198955F9@TYAPR01MB6507.jpnprd01.prod.outlook.com>
Date:   Tue, 25 Jan 2022 11:50:35 +0000
From:   "d.hatayama@...itsu.com" <d.hatayama@...itsu.com>
To:     "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dyoung@...hat.com" <dyoung@...hat.com>
CC:     "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "bhe@...hat.com" <bhe@...hat.com>,
        "vgoyal@...hat.com" <vgoyal@...hat.com>,
        "stern@...land.harvard.edu" <stern@...land.harvard.edu>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "corbet@....net" <corbet@....net>,
        "halves@...onical.com" <halves@...onical.com>,
        "kernel@...ccoli.net" <kernel@...ccoli.net>,
        "d.hatayama@...itsu.com" <d.hatayama@...itsu.com>
Subject: Re: [PATCH V4] notifier/panic: Introduce panic_notifier_filter

> @@ -146,6 +157,34 @@ void nmi_panic(struct pt_regs *regs, const char *msg)
>  }
>  EXPORT_SYMBOL(nmi_panic);
> 
> +static int __init panic_notifier_filter_setup(char *buf)
> +{
> +       char *func;
> +       unsigned long addr;
> +
> +       while ((func = strsep(&buf, ","))) {
> +               addr = kallsyms_lookup_name(func);
> +               if (!addr) {
> +                       pr_warn("panic_notifier_filter: invalid symbol %s\n", func);
> +                       continue;
> +               }

Could you remove this check?

panic_notifier_list is exported to kernel modules and this check
prevents such users from using this feature.

Thanks.
HATAYAMA, Daisuke