linux-kernel - Re: [PATCH 2/4] kasan: MODULE_VADDR is not available on all archs

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Date:	Thu, 3 Sep 2015 11:25:09 +0300
From:	Andrey Ryabinin <ryabinin.a.a@...il.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] kasan: MODULE_VADDR is not available on all archs



On 09/03/2015 10:54 AM, Aneesh Kumar K.V wrote:
> Use is_module_text_address instead
> 

It should be is_module_address().

We use kernel_or_module_addr() to determine whether this
address belongs to some global variable or not.
And variables are in .data section, .text is only code.

Something like is_module_data_address() would be more precise here.
But since we don't have it, we can just use is_module_address().
Definitely not is_module_text_address().

> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> ---
>  mm/kasan/report.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/kasan/report.c b/mm/kasan/report.c
> index 6c3f82b0240b..01d2efec8ea4 100644
> --- a/mm/kasan/report.c
> +++ b/mm/kasan/report.c
> @@ -22,6 +22,7 @@
>  #include <linux/string.h>
>  #include <linux/types.h>
>  #include <linux/kasan.h>
> +#include <linux/module.h>
>  
>  #include <asm/sections.h>
>  
> @@ -85,9 +86,11 @@ static void print_error_description(struct kasan_access_info *info)
>  
>  static inline bool kernel_or_module_addr(const void *addr)
>  {
> -	return (addr >= (void *)_stext && addr < (void *)_end)
> -		|| (addr >= (void *)MODULES_VADDR
> -			&& addr < (void *)MODULES_END);
> +	if (addr >= (void *)_stext && addr < (void *)_end)
> +		return true;
> +	if (is_module_text_address((unsigned long)addr))
> +		return true;
> +	return false;
>  }
>  
>  static inline bool init_task_stack_addr(const void *addr)
> 
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