linux-kernel - Re: [BUGFIX PATCH] tracing/kprobes: Fix strpbrk() argument order

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Date:   Thu, 1 Nov 2018 15:10:14 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [BUGFIX PATCH] tracing/kprobes: Fix strpbrk() argument order

On Thu,  1 Nov 2018 23:29:28 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Fix strpbrk()'s argument order, it must pass acceptable string
> in 2nd argument. Note that this can cause a kernel panic where
> it recovers backup character to code->data.
> 
> Fixes: a6682814f371 ("tracing/kprobes: Allow kprobe-events to record module symbol")
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>

Thanks Masami,

I'm pulling this and starting to test it.

-- Steve

> ---
>  kernel/trace/trace_probe.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
> index 3ef15a6683c0..bd30e9398d2a 100644
> --- a/kernel/trace/trace_probe.c
> +++ b/kernel/trace/trace_probe.c
> @@ -535,7 +535,7 @@ int traceprobe_update_arg(struct probe_arg *arg)
>  			if (code[1].op != FETCH_OP_IMM)
>  				return -EINVAL;
>  
> -			tmp = strpbrk("+-", code->data);
> +			tmp = strpbrk(code->data, "+-");
>  			if (tmp)
>  				c = *tmp;
>  			ret = traceprobe_split_symbol_offset(code->data,