Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
MIME-Version: 1.0
References: <20230710030711.812898-1-azeemshaikh38@gmail.com>
In-Reply-To: <20230710030711.812898-1-azeemshaikh38@gmail.com>
From:   Pavan Chebbi <pavan.chebbi@broadcom.com>
Date:   Mon, 10 Jul 2023 09:56:53 +0530
Message-ID: <CALs4sv27N_egw=x+3xwV7f1OOjUov2LfoxQGFfYm_CBBtyx1iw@mail.gmail.com>
Subject: Re: [PATCH] net: sched: Replace strlcpy with strscpy
To:     Azeem Shaikh <azeemshaikh38@gmail.com>
Cc:     Jamal Hadi Salim <jhs@mojatatu.com>,
        Cong Wang <xiyou.wangcong@gmail.com>,
        Jiri Pirko <jiri@resnulli.us>, linux-hardening@vger.kernel.org,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>
Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256;
        boundary="0000000000001844f506001a659e"
Precedence: bulk

--0000000000001844f506001a659e
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

On Mon, Jul 10, 2023 at 8:37=E2=80=AFAM Azeem Shaikh <azeemshaikh38@gmail.c=
om> 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().
>
> Direct replacement is safe here since return value of -errno
> is used to check for truncation instead of sizeof(dest).
>
> [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcp=
y
> [2] https://github.com/KSPP/linux/issues/89
>
> Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
> ---

Looks good to me.
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>

>  net/sched/act_api.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sched/act_api.c b/net/sched/act_api.c
> index f7887f42d542..9d3f26bf0440 100644
> --- a/net/sched/act_api.c
> +++ b/net/sched/act_api.c
> @@ -1320,7 +1320,7 @@ struct tc_action_ops *tc_action_load_ops(struct nla=
ttr *nla, bool police,
>                         return ERR_PTR(err);
>                 }
>         } else {
> -               if (strlcpy(act_name, "police", IFNAMSIZ) >=3D IFNAMSIZ) =
{
> +               if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
>                         NL_SET_ERR_MSG(extack, "TC action name too long")=
;
>                         return ERR_PTR(-EINVAL);
>                 }
> --
> 2.41.0.255.g8b1d071c50-goog
>
>
>

--0000000000001844f506001a659e
Content-Type: application/pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
Content-Description: S/MIME Cryptographic Signature
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--0000000000001844f506001a659e--