linux-kernel - Re: [PATCH v2 6/7] sections: Add new is_kernel() and is_kernel

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Message-ID: <20210728113204.67fa6dfc@oasis.local.home>
Date:   Wed, 28 Jul 2021 11:32:04 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     <arnd@...db.de>, <linux-arch@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
        <mingo@...hat.com>, <davem@...emloft.net>, <ast@...nel.org>,
        <ryabinin.a.a@...il.com>, <mpe@...erman.id.au>,
        <benh@...nel.crashing.org>, <paulus@...ba.org>
Subject: Re: [PATCH v2 6/7] sections: Add new is_kernel() and
 is_kernel_text()

On Wed, 28 Jul 2021 16:13:19 +0800
Kefeng Wang <wangkefeng.wang@...wei.com> wrote:

> @@ -64,8 +64,7 @@ const struct exception_table_entry *search_exception_tables(unsigned long addr)
>  
>  int notrace core_kernel_text(unsigned long addr)
>  {
> -	if (addr >= (unsigned long)_stext &&
> -	    addr < (unsigned long)_etext)
> +	if (is_kernel_text(addr))

Perhaps this was a bug, and these functions should be checking the gate
area as well, as that is part of kernel text.

-- Steve


>  		return 1;
>  
>  	if (system_state < SYSTEM_RUNNING &&
> diff --git a/mm/kasan/report.c b/mm/kasan/report.c
> index 884a950c7026..88f5b0c058b7 100644
> --- a/mm/kasan/report.c
> +++ b/mm/kasan/report.c
> @@ -235,7 +235,7 @@ static void describe_object(struct kmem_cache *cache, void *object,
>  
>  static inline bool kernel_or_module_addr(const void *addr)
>  {
> -	if (addr >= (void *)_stext && addr < (void *)_end)
> +	if (is_kernel((unsigned long)addr))
>  		return true;
>  	if (is_module_address((unsigned long)addr))
>  		return true;
> --