linux-kernel - Re: [PATCH v3 4/5] tracing/probe: Add ustring type for user-space string

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Date:   Wed, 27 Feb 2019 21:20:47 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Changbin Du <changbin.du@...il.com>,
        Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Andy Lutomirski <luto@...nel.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Nadav Amit <namit@...are.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v3 4/5] tracing/probe: Add ustring type for user-space
 string

On Wed, 27 Feb 2019 23:44:13 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Add "ustring" type for fetching user-space string from kprobe event.
> User can specify ustring type at uprobe event, and it is same as
> "string" for uprobe.
> 
> Note that probe-event provides this option but it doesn't choose the
> correct type automatically since we have not way to decide the address
> is in user-space or not on some arch (and on some other arch, you can
> fetch the string by "string" type). So user must carefully check the
> target code (e.g. if you see __user on the target variable) and
> use this new type.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  Changes in v2:
>  - Use strnlen_user() instead of open code for fetch_store_strlen_user().


Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve