Re: [PATCH] tracing/uprobe: Replace strlcpy() with strscpy()

[Kees Cook]

On Fri, Dec 01, 2023 at 03:27:26PM +0900, Masami Hiramatsu wrote:
> On Thu, 30 Nov 2023 12:56:08 -0800
> Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> 
> > strlcpy() reads the entire source buffer first. This read may exceed
> > the destination size limit. This is both inefficient and can lead
> > to linear read overflows if a source string is not NUL-terminated[1].
> > Additionally, it returns the size of the source string, not the
> > resulting size of the destination string. In an effort to remove strlcpy()
> > completely[2], replace strlcpy() here with strscpy().
> > 
> > The negative return value is already handled by this code so no new
> > handling is needed here.
> > 
> > Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy [1]
> > Link: https://github.com/KSPP/linux/issues/89 [2]
> > Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
> > Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
> > Cc: linux-trace-kernel@xxxxxxxxxxxxxxx
> > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> 
> Hi Kees,
> 
> As same as sample's change, should I ask you to pick this to your tree?
> Since it is a kind of a part of series patch. I'm OK for it since this
> does not change the code so much.
> 
> In that case, please feel free to add my Ack.
> 
> Acked-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>

Either way is fine, but I can take it since I've got a few others
already too. :)

Thanks!

-Kees

-- 
Kees Cook