linux-kernel - Re: [PATCH] ftrace: Fix print_ip_ins() to print only two digits per byte

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Date:   Sat, 10 Dec 2022 12:12:23 +0800
From:   Zheng Yejian <zhengyejian1@...wei.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>
CC:     Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] ftrace: Fix print_ip_ins() to print only two digits per
 byte


On 2022/12/9 23:56, Steven Rostedt wrote:
> From: "Steven Rostedt (Google)" <rostedt@...dmis.org>
> 
> Fix print_ip_ins() to use unsigned char, as:
> 
> 	e9:2b:b6:0d:18
> 
> is easier to understand than
> 
> 	ffffffe9:2b:ffffffb6:0d:18
> 
> Link: https://lore.kernel.org/all/CA+wXwBQ-VhK+hpBtYtyZP-NiX4g8fqRRWithFOHQW-0coQ3vLg@mail.gmail.com/
> 
> Cc: stable@...r.kernel.org
> Fixes: 6c14133d2d3f7 ("ftrace: Do not blindly read the ip address in ftrace_bug()")
> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> ---
>   kernel/trace/ftrace.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index d04552c0c275..32fc1600d596 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -2028,7 +2028,7 @@ static int ftrace_hash_ipmodify_update(struct ftrace_ops *ops,
>   
>   static void print_ip_ins(const char *fmt, const unsigned char *p)
>   {
> -	char ins[MCOUNT_INSN_SIZE];
> +	unsigned char ins[MCOUNT_INSN_SIZE];
>   
>   	if (copy_from_kernel_nofault(ins, p, MCOUNT_INSN_SIZE)) {
>   		printk(KERN_CONT "%s[FAULT] %px\n", fmt, p);

Hi, Steve,

commit 30f7d1cac2aa ("ftrace: Fix char print issue in print_ip_ins()")
has solved this issue.

Link: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=30f7d1cac2aab8fec560a388ad31ca5e5d04a822