linux-kernel - Re: [PATCH] scs: Fix a wrong parameter in __scs

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Date:   Tue, 5 Jul 2022 10:58:49 +0100
From:   Will Deacon <will@...nel.org>
To:     Wan Jiabing <wanjiabing@...o.com>
Cc:     Marco Elver <elver@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Yee Lee <yee.lee@...iatek.com>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, Xie Jiyuan <xiejiyuan@...o.com>
Subject: Re: [PATCH] scs: Fix a wrong parameter in __scs_magic

On Mon, Jul 04, 2022 at 03:04:03PM +0800, Wan Jiabing wrote:
> __scs_magic() needs a 'void *' variable, but a 'struct task_struct *'
> is given. 'task_scs(tsk)' is the starting address of the task's shadow
> call stack, and '__scs_magic(task_scs(tsk))' is the end address of the
> task's shadow call stack.
> Here should be '__scs_magic(task_scs(tsk))'.
> 
> Fixes: 5bbaf9d1fcb9 ("scs: Add support for stack usage debugging")
> Signed-off-by: Xie Jiyuan <xiejiyuan@...o.com>
> Signed-off-by: Wan Jiabing <wanjiabing@...o.com>
> ---
>  kernel/scs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/scs.c b/kernel/scs.c
> index b7e1b096d906..4c1ce6a6172d 100644
> --- a/kernel/scs.c
> +++ b/kernel/scs.c
> @@ -125,7 +125,7 @@ static void scs_check_usage(struct task_struct *tsk)
>  	if (!IS_ENABLED(CONFIG_DEBUG_STACK_USAGE))
>  		return;
>  
> -	for (p = task_scs(tsk); p < __scs_magic(tsk); ++p) {
> +	for (p = task_scs(tsk); p < __scs_magic(task_scs(tsk)); ++p) {
>  		if (!READ_ONCE_NOCHECK(*p))
>  			break;
>  		used += sizeof(*p);

Acked-by: Will Deacon <will@...nel.org>

I'm assuming this will go via Andrew or Kees.

Will