From: Kees Cook <keescook@chromium.org>
To: Azeem Shaikh <azeemshaikh38@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
linux-hardening@vger.kernel.org,
Martin KaFai Lau <martin.lau@linux.dev>,
Song Liu <song@kernel.org>, Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>,
bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
Ilya Leoshkevich <iii@linux.ibm.com>
Subject: Re: [PATCH] bpf: Replace all non-returning strlcpy with strscpy
Date: Tue, 30 May 2023 16:17:31 -0700 [thread overview]
Message-ID: <202305301617.EEB6B76B5B@keescook> (raw)
In-Reply-To: <20230530155659.309657-1-azeemshaikh38@gmail.com>
On Tue, May 30, 2023 at 03:56:59PM +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:[~2023-05-30 23:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-30 15:56 [PATCH] bpf: Replace all non-returning strlcpy with strscpy Azeem Shaikh
2023-05-30 23:17 ` Kees Cook [this message]
2023-05-31 11:10 ` patchwork-bot+netdevbpf
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