mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 20:22:09 +00:00
ec189da923
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@vger.kernel.org Signed-off-by: Justin Stitt <justinstitt@google.com> Link: https://lore.kernel.org/r/20231020-strncpy-drivers-rpmsg-rpmsg_ns-c-v1-1-99b16b00c36c@google.com Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) STMicroelectronics 2020 - All Rights Reserved
|
|
*/
|
|
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/rpmsg.h>
|
|
#include <linux/rpmsg/ns.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "rpmsg_internal.h"
|
|
|
|
/**
|
|
* rpmsg_ns_register_device() - register name service device based on rpdev
|
|
* @rpdev: prepared rpdev to be used for creating endpoints
|
|
*
|
|
* This function wraps rpmsg_register_device() preparing the rpdev for use as
|
|
* basis for the rpmsg name service device.
|
|
*/
|
|
int rpmsg_ns_register_device(struct rpmsg_device *rpdev)
|
|
{
|
|
rpdev->src = RPMSG_NS_ADDR;
|
|
rpdev->dst = RPMSG_NS_ADDR;
|
|
|
|
return rpmsg_register_device_override(rpdev, "rpmsg_ns");
|
|
}
|
|
EXPORT_SYMBOL(rpmsg_ns_register_device);
|
|
|
|
/* invoked when a name service announcement arrives */
|
|
static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len,
|
|
void *priv, u32 src)
|
|
{
|
|
struct rpmsg_ns_msg *msg = data;
|
|
struct rpmsg_device *newch;
|
|
struct rpmsg_channel_info chinfo;
|
|
struct device *dev = rpdev->dev.parent;
|
|
int ret;
|
|
|
|
#if defined(CONFIG_DYNAMIC_DEBUG)
|
|
dynamic_hex_dump("NS announcement: ", DUMP_PREFIX_NONE, 16, 1,
|
|
data, len, true);
|
|
#endif
|
|
|
|
if (len != sizeof(*msg)) {
|
|
dev_err(dev, "malformed ns msg (%d)\n", len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* don't trust the remote processor for null terminating the name */
|
|
msg->name[RPMSG_NAME_SIZE - 1] = '\0';
|
|
|
|
strscpy_pad(chinfo.name, msg->name, sizeof(chinfo.name));
|
|
chinfo.src = RPMSG_ADDR_ANY;
|
|
chinfo.dst = rpmsg32_to_cpu(rpdev, msg->addr);
|
|
|
|
dev_info(dev, "%sing channel %s addr 0x%x\n",
|
|
rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY ?
|
|
"destroy" : "creat", msg->name, chinfo.dst);
|
|
|
|
if (rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY) {
|
|
ret = rpmsg_release_channel(rpdev, &chinfo);
|
|
if (ret)
|
|
dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret);
|
|
} else {
|
|
newch = rpmsg_create_channel(rpdev, &chinfo);
|
|
if (!newch)
|
|
dev_err(dev, "rpmsg_create_channel failed\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rpmsg_ns_probe(struct rpmsg_device *rpdev)
|
|
{
|
|
struct rpmsg_endpoint *ns_ept;
|
|
struct rpmsg_channel_info ns_chinfo = {
|
|
.src = RPMSG_NS_ADDR,
|
|
.dst = RPMSG_NS_ADDR,
|
|
.name = "name_service",
|
|
};
|
|
|
|
/*
|
|
* Create the NS announcement service endpoint associated to the RPMsg
|
|
* device. The endpoint will be automatically destroyed when the RPMsg
|
|
* device will be deleted.
|
|
*/
|
|
ns_ept = rpmsg_create_ept(rpdev, rpmsg_ns_cb, NULL, ns_chinfo);
|
|
if (!ns_ept) {
|
|
dev_err(&rpdev->dev, "failed to create the ns ept\n");
|
|
return -ENOMEM;
|
|
}
|
|
rpdev->ept = ns_ept;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct rpmsg_driver rpmsg_ns_driver = {
|
|
.drv.name = KBUILD_MODNAME,
|
|
.probe = rpmsg_ns_probe,
|
|
};
|
|
|
|
static int rpmsg_ns_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_rpmsg_driver(&rpmsg_ns_driver);
|
|
if (ret < 0)
|
|
pr_err("%s: Failed to register rpmsg driver\n", __func__);
|
|
|
|
return ret;
|
|
}
|
|
postcore_initcall(rpmsg_ns_init);
|
|
|
|
static void rpmsg_ns_exit(void)
|
|
{
|
|
unregister_rpmsg_driver(&rpmsg_ns_driver);
|
|
}
|
|
module_exit(rpmsg_ns_exit);
|
|
|
|
MODULE_DESCRIPTION("Name service announcement rpmsg driver");
|
|
MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");
|
|
MODULE_ALIAS("rpmsg:" KBUILD_MODNAME);
|
|
MODULE_LICENSE("GPL v2");
|