From: Kees Cook <keescook@chromium.org>
To: Azeem Shaikh <azeemshaikh38@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
linux-hardening@vger.kernel.org,
Mark Rutland <mark.rutland@arm.com>,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org
Subject: Re: [PATCH] ftrace: Replace all non-returning strlcpy with strscpy
Date: Wed, 17 May 2023 12:14:45 -0700 [thread overview]
Message-ID: <202305171214.3D13652AC@keescook> (raw)
In-Reply-To: <20230517145323.1522010-1-azeemshaikh38@gmail.com>
On Wed, May 17, 2023 at 02:53:23PM +0000, Azeem Shaikh 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].
> In an effort to remove strlcpy() completely [2], replace
> strlcpy() here with strscpy().
> No return values were used, so direct replacement is safe.
>
> [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
> [2] https://github.com/KSPP/linux/issues/89
>
> Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
--
Kees Cook
next prev parent reply other threads:[~2023-05-17 19:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-17 14:53 [PATCH] ftrace: Replace all non-returning strlcpy with strscpy Azeem Shaikh
2023-05-17 19:14 ` Kees Cook [this message]
2023-05-17 22:28 ` Masami Hiramatsu
2023-05-26 17:45 ` Kees Cook
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