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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: netdev@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt Content-Type: text/plain; charset="utf-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org strncpy() is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. We expect chinfo.name to be NUL-terminated based on its use with format strings and sprintf: rpmsg/rpmsg_char.c 165: dev_err(dev, "failed to open %s\n", eptdev->chinfo.name); 368: return sprintf(buf, "%s\n", eptdev->chinfo.name); ... and with strcmp(): | static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev, | rpmsg_rx_cb_t cb, | void *priv, | struct rpmsg_channel_info | chinfo) | ... | const char *name = chinfo.name; | ... | if (!strcmp(channel->name, name)) Moreover, as chinfo is not kzalloc'd, let's opt to NUL-pad the destination buffer Similar change to: Commit 766279a8f85d ("rpmsg: qcom: glink: replace strncpy() with strscpy_pad()") and Commit 08de420a8014 ("rpmsg: glink: Replace strncpy() with strscpy_pad()") Considering the above, a suitable replacement is `strscpy_pad` due to the fact that it guarantees both NUL-termination and NUL-padding on the destination buffer. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt --- Note: build-tested only. Found with: $ rg "strncpy\(" --- drivers/net/wwan/rpmsg_wwan_ctrl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wwan/rpmsg_wwan_ctrl.c b/drivers/net/wwan/rpmsg_wwan_ctrl.c index 86b60aadfa11..39f5e780c478 100644 --- a/drivers/net/wwan/rpmsg_wwan_ctrl.c +++ b/drivers/net/wwan/rpmsg_wwan_ctrl.c @@ -37,7 +37,7 @@ static int rpmsg_wwan_ctrl_start(struct wwan_port *port) .dst = RPMSG_ADDR_ANY, }; - strncpy(chinfo.name, rpwwan->rpdev->id.name, RPMSG_NAME_SIZE); + strscpy_pad(chinfo.name, rpwwan->rpdev->id.name, sizeof(chinfo.name)); rpwwan->ept = rpmsg_create_ept(rpwwan->rpdev, rpmsg_wwan_ctrl_callback, rpwwan, chinfo); if (!rpwwan->ept) --- base-commit: 58720809f52779dc0f08e53e54b014209d13eebb change-id: 20231018-strncpy-drivers-net-wwan-rpmsg_wwan_ctrl-c-3f620aafd326 Best regards, -- Justin Stitt