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Message-ID: <20231020-strncpy-drivers-rpmsg-rpmsg_ns-c-v1-1-99b16b00c36c@google.com> Date: Fri, 20 Oct 2023 23:18:59 +0000 From: Justin Stitt <justinstitt@...gle.com> To: Bjorn Andersson <andersson@...nel.org>, Mathieu Poirier <mathieu.poirier@...aro.org> Cc: linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org, Justin Stitt <justinstitt@...gle.com> Subject: [PATCH] rpmsg: replace deprecated strncpy with strscpy_pad 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: | dev_err(&ctrldev->dev, "failed to create %s channel\n", chinfo.name); Since chinfo is not default initialized, we should NUL-pad the `name` field so that the behavior is consistent with what strncpy() provides: | struct rpmsg_channel_info chinfo; 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@...r.kernel.org Signed-off-by: Justin Stitt <justinstitt@...gle.com> --- Note: build-tested only. Found with: $ rg "strncpy\(" --- drivers/rpmsg/rpmsg_ns.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/rpmsg/rpmsg_ns.c b/drivers/rpmsg/rpmsg_ns.c index c70ad03ff2e9..bde8c8d433e0 100644 --- a/drivers/rpmsg/rpmsg_ns.c +++ b/drivers/rpmsg/rpmsg_ns.c @@ -50,7 +50,7 @@ static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len, /* don't trust the remote processor for null terminating the name */ msg->name[RPMSG_NAME_SIZE - 1] = '\0'; - strncpy(chinfo.name, msg->name, sizeof(chinfo.name)); + strscpy_pad(chinfo.name, msg->name, sizeof(chinfo.name)); chinfo.src = RPMSG_ADDR_ANY; chinfo.dst = rpmsg32_to_cpu(rpdev, msg->addr); --- base-commit: 9c5d00cb7b6bbc5a7965d9ab7d223b5402d1f02c change-id: 20231020-strncpy-drivers-rpmsg-rpmsg_ns-c-ffe3fa2bb9ff Best regards, -- Justin Stitt <justinstitt@...gle.com>
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