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![Azeem Shaikh](/assets/img/avatar_default.png)
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> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20230523021640.2406585-1-azeemshaikh38@gmail.com
724 lines
18 KiB
C
724 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* configfs.c - Implementation of configfs interface to the driver stack
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*
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* Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/configfs.h>
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#include <linux/most.h>
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#define MAX_STRING_SIZE 80
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struct mdev_link {
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struct config_item item;
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struct list_head list;
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bool create_link;
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bool destroy_link;
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u16 num_buffers;
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u16 buffer_size;
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u16 subbuffer_size;
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u16 packets_per_xact;
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u16 dbr_size;
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char datatype[MAX_STRING_SIZE];
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char direction[MAX_STRING_SIZE];
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char name[MAX_STRING_SIZE];
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char device[MAX_STRING_SIZE];
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char channel[MAX_STRING_SIZE];
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char comp[MAX_STRING_SIZE];
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char comp_params[MAX_STRING_SIZE];
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};
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static struct list_head mdev_link_list;
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static int set_cfg_buffer_size(struct mdev_link *link)
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{
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return most_set_cfg_buffer_size(link->device, link->channel,
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link->buffer_size);
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}
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static int set_cfg_subbuffer_size(struct mdev_link *link)
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{
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return most_set_cfg_subbuffer_size(link->device, link->channel,
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link->subbuffer_size);
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}
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static int set_cfg_dbr_size(struct mdev_link *link)
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{
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return most_set_cfg_dbr_size(link->device, link->channel,
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link->dbr_size);
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}
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static int set_cfg_num_buffers(struct mdev_link *link)
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{
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return most_set_cfg_num_buffers(link->device, link->channel,
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link->num_buffers);
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}
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static int set_cfg_packets_xact(struct mdev_link *link)
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{
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return most_set_cfg_packets_xact(link->device, link->channel,
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link->packets_per_xact);
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}
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static int set_cfg_direction(struct mdev_link *link)
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{
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return most_set_cfg_direction(link->device, link->channel,
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link->direction);
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}
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static int set_cfg_datatype(struct mdev_link *link)
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{
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return most_set_cfg_datatype(link->device, link->channel,
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link->datatype);
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}
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static int (*set_config_val[])(struct mdev_link *link) = {
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set_cfg_buffer_size,
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set_cfg_subbuffer_size,
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set_cfg_dbr_size,
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set_cfg_num_buffers,
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set_cfg_packets_xact,
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set_cfg_direction,
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set_cfg_datatype,
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};
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static struct mdev_link *to_mdev_link(struct config_item *item)
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{
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return container_of(item, struct mdev_link, item);
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}
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static int set_config_and_add_link(struct mdev_link *mdev_link)
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{
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int i;
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int ret;
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for (i = 0; i < ARRAY_SIZE(set_config_val); i++) {
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ret = set_config_val[i](mdev_link);
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if (ret < 0 && ret != -ENODEV) {
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pr_err("Config failed\n");
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return ret;
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}
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}
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return most_add_link(mdev_link->device, mdev_link->channel,
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mdev_link->comp, mdev_link->name,
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mdev_link->comp_params);
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}
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static ssize_t mdev_link_create_link_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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bool tmp;
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int ret;
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ret = kstrtobool(page, &tmp);
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if (ret)
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return ret;
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if (!tmp)
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return count;
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ret = set_config_and_add_link(mdev_link);
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if (ret && ret != -ENODEV)
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return ret;
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list_add_tail(&mdev_link->list, &mdev_link_list);
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mdev_link->create_link = tmp;
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mdev_link->destroy_link = false;
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return count;
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}
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static ssize_t mdev_link_destroy_link_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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bool tmp;
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int ret;
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ret = kstrtobool(page, &tmp);
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if (ret)
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return ret;
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if (!tmp)
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return count;
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ret = most_remove_link(mdev_link->device, mdev_link->channel,
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mdev_link->comp);
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if (ret)
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return ret;
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if (!list_empty(&mdev_link_list))
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list_del(&mdev_link->list);
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mdev_link->destroy_link = tmp;
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return count;
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}
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static ssize_t mdev_link_direction_show(struct config_item *item, char *page)
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{
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return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->direction);
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}
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static ssize_t mdev_link_direction_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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if (!sysfs_streq(page, "dir_rx") && !sysfs_streq(page, "rx") &&
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!sysfs_streq(page, "dir_tx") && !sysfs_streq(page, "tx"))
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return -EINVAL;
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strcpy(mdev_link->direction, page);
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strim(mdev_link->direction);
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return count;
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}
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static ssize_t mdev_link_datatype_show(struct config_item *item, char *page)
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{
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return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->datatype);
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}
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static ssize_t mdev_link_datatype_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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if (!sysfs_streq(page, "control") && !sysfs_streq(page, "async") &&
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!sysfs_streq(page, "sync") && !sysfs_streq(page, "isoc") &&
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!sysfs_streq(page, "isoc_avp"))
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return -EINVAL;
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strcpy(mdev_link->datatype, page);
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strim(mdev_link->datatype);
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return count;
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}
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static ssize_t mdev_link_device_show(struct config_item *item, char *page)
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{
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return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->device);
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}
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static ssize_t mdev_link_device_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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strscpy(mdev_link->device, page, sizeof(mdev_link->device));
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strim(mdev_link->device);
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return count;
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}
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static ssize_t mdev_link_channel_show(struct config_item *item, char *page)
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{
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return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->channel);
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}
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static ssize_t mdev_link_channel_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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strscpy(mdev_link->channel, page, sizeof(mdev_link->channel));
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strim(mdev_link->channel);
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return count;
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}
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static ssize_t mdev_link_comp_show(struct config_item *item, char *page)
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{
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return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->comp);
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}
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static ssize_t mdev_link_comp_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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strscpy(mdev_link->comp, page, sizeof(mdev_link->comp));
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strim(mdev_link->comp);
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return count;
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}
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static ssize_t mdev_link_comp_params_show(struct config_item *item, char *page)
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{
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return snprintf(page, PAGE_SIZE, "%s\n",
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to_mdev_link(item)->comp_params);
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}
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static ssize_t mdev_link_comp_params_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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strscpy(mdev_link->comp_params, page, sizeof(mdev_link->comp_params));
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strim(mdev_link->comp_params);
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return count;
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}
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static ssize_t mdev_link_num_buffers_show(struct config_item *item, char *page)
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{
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return snprintf(page, PAGE_SIZE, "%d\n",
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to_mdev_link(item)->num_buffers);
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}
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static ssize_t mdev_link_num_buffers_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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int ret;
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ret = kstrtou16(page, 0, &mdev_link->num_buffers);
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if (ret)
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return ret;
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return count;
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}
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static ssize_t mdev_link_buffer_size_show(struct config_item *item, char *page)
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{
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return snprintf(page, PAGE_SIZE, "%d\n",
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to_mdev_link(item)->buffer_size);
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}
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static ssize_t mdev_link_buffer_size_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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int ret;
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ret = kstrtou16(page, 0, &mdev_link->buffer_size);
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if (ret)
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return ret;
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return count;
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}
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static ssize_t mdev_link_subbuffer_size_show(struct config_item *item,
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char *page)
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{
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return snprintf(page, PAGE_SIZE, "%d\n",
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to_mdev_link(item)->subbuffer_size);
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}
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static ssize_t mdev_link_subbuffer_size_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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int ret;
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ret = kstrtou16(page, 0, &mdev_link->subbuffer_size);
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if (ret)
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return ret;
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return count;
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}
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static ssize_t mdev_link_packets_per_xact_show(struct config_item *item,
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char *page)
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{
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return snprintf(page, PAGE_SIZE, "%d\n",
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to_mdev_link(item)->packets_per_xact);
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}
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static ssize_t mdev_link_packets_per_xact_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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int ret;
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ret = kstrtou16(page, 0, &mdev_link->packets_per_xact);
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if (ret)
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return ret;
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return count;
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}
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static ssize_t mdev_link_dbr_size_show(struct config_item *item, char *page)
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{
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return snprintf(page, PAGE_SIZE, "%d\n", to_mdev_link(item)->dbr_size);
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}
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static ssize_t mdev_link_dbr_size_store(struct config_item *item,
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const char *page, size_t count)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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int ret;
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ret = kstrtou16(page, 0, &mdev_link->dbr_size);
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if (ret)
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return ret;
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return count;
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}
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CONFIGFS_ATTR_WO(mdev_link_, create_link);
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CONFIGFS_ATTR_WO(mdev_link_, destroy_link);
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CONFIGFS_ATTR(mdev_link_, device);
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CONFIGFS_ATTR(mdev_link_, channel);
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CONFIGFS_ATTR(mdev_link_, comp);
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CONFIGFS_ATTR(mdev_link_, comp_params);
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CONFIGFS_ATTR(mdev_link_, num_buffers);
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CONFIGFS_ATTR(mdev_link_, buffer_size);
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CONFIGFS_ATTR(mdev_link_, subbuffer_size);
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CONFIGFS_ATTR(mdev_link_, packets_per_xact);
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CONFIGFS_ATTR(mdev_link_, datatype);
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CONFIGFS_ATTR(mdev_link_, direction);
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CONFIGFS_ATTR(mdev_link_, dbr_size);
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static struct configfs_attribute *mdev_link_attrs[] = {
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&mdev_link_attr_create_link,
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&mdev_link_attr_destroy_link,
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&mdev_link_attr_device,
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&mdev_link_attr_channel,
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&mdev_link_attr_comp,
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&mdev_link_attr_comp_params,
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&mdev_link_attr_num_buffers,
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&mdev_link_attr_buffer_size,
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&mdev_link_attr_subbuffer_size,
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&mdev_link_attr_packets_per_xact,
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&mdev_link_attr_datatype,
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&mdev_link_attr_direction,
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&mdev_link_attr_dbr_size,
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NULL,
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};
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static void mdev_link_release(struct config_item *item)
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{
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struct mdev_link *mdev_link = to_mdev_link(item);
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int ret;
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if (mdev_link->destroy_link)
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goto free_item;
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ret = most_remove_link(mdev_link->device, mdev_link->channel,
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mdev_link->comp);
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if (ret) {
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pr_err("Removing link failed.\n");
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goto free_item;
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}
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if (!list_empty(&mdev_link_list))
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list_del(&mdev_link->list);
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free_item:
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kfree(to_mdev_link(item));
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}
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static struct configfs_item_operations mdev_link_item_ops = {
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.release = mdev_link_release,
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};
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static const struct config_item_type mdev_link_type = {
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.ct_item_ops = &mdev_link_item_ops,
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.ct_attrs = mdev_link_attrs,
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.ct_owner = THIS_MODULE,
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};
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struct most_common {
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struct config_group group;
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struct module *mod;
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struct configfs_subsystem subsys;
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};
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static struct most_common *to_most_common(struct configfs_subsystem *subsys)
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{
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return container_of(subsys, struct most_common, subsys);
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}
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static struct config_item *most_common_make_item(struct config_group *group,
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const char *name)
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{
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struct mdev_link *mdev_link;
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struct most_common *mc = to_most_common(group->cg_subsys);
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mdev_link = kzalloc(sizeof(*mdev_link), GFP_KERNEL);
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if (!mdev_link)
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return ERR_PTR(-ENOMEM);
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|
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if (!try_module_get(mc->mod)) {
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kfree(mdev_link);
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return ERR_PTR(-ENOLCK);
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}
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config_item_init_type_name(&mdev_link->item, name,
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&mdev_link_type);
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if (!strcmp(group->cg_item.ci_namebuf, "most_cdev"))
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strcpy(mdev_link->comp, "cdev");
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else if (!strcmp(group->cg_item.ci_namebuf, "most_net"))
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strcpy(mdev_link->comp, "net");
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else if (!strcmp(group->cg_item.ci_namebuf, "most_video"))
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strcpy(mdev_link->comp, "video");
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strcpy(mdev_link->name, name);
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return &mdev_link->item;
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}
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|
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static void most_common_release(struct config_item *item)
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{
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struct config_group *group = to_config_group(item);
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kfree(to_most_common(group->cg_subsys));
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}
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static struct configfs_item_operations most_common_item_ops = {
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.release = most_common_release,
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};
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static void most_common_disconnect(struct config_group *group,
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struct config_item *item)
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{
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struct most_common *mc = to_most_common(group->cg_subsys);
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module_put(mc->mod);
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}
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static struct configfs_group_operations most_common_group_ops = {
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.make_item = most_common_make_item,
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.disconnect_notify = most_common_disconnect,
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};
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static const struct config_item_type most_common_type = {
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.ct_item_ops = &most_common_item_ops,
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.ct_group_ops = &most_common_group_ops,
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.ct_owner = THIS_MODULE,
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};
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|
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static struct most_common most_cdev = {
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.subsys = {
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.su_group = {
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.cg_item = {
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.ci_namebuf = "most_cdev",
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.ci_type = &most_common_type,
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},
|
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},
|
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},
|
|
};
|
|
|
|
static struct most_common most_net = {
|
|
.subsys = {
|
|
.su_group = {
|
|
.cg_item = {
|
|
.ci_namebuf = "most_net",
|
|
.ci_type = &most_common_type,
|
|
},
|
|
},
|
|
},
|
|
};
|
|
|
|
static struct most_common most_video = {
|
|
.subsys = {
|
|
.su_group = {
|
|
.cg_item = {
|
|
.ci_namebuf = "most_video",
|
|
.ci_type = &most_common_type,
|
|
},
|
|
},
|
|
},
|
|
};
|
|
|
|
struct most_snd_grp {
|
|
struct config_group group;
|
|
bool create_card;
|
|
struct list_head list;
|
|
};
|
|
|
|
static struct most_snd_grp *to_most_snd_grp(struct config_item *item)
|
|
{
|
|
return container_of(to_config_group(item), struct most_snd_grp, group);
|
|
}
|
|
|
|
static struct config_item *most_snd_grp_make_item(struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct mdev_link *mdev_link;
|
|
|
|
mdev_link = kzalloc(sizeof(*mdev_link), GFP_KERNEL);
|
|
if (!mdev_link)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
config_item_init_type_name(&mdev_link->item, name, &mdev_link_type);
|
|
mdev_link->create_link = false;
|
|
strcpy(mdev_link->name, name);
|
|
strcpy(mdev_link->comp, "sound");
|
|
return &mdev_link->item;
|
|
}
|
|
|
|
static ssize_t most_snd_grp_create_card_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct most_snd_grp *snd_grp = to_most_snd_grp(item);
|
|
int ret;
|
|
bool tmp;
|
|
|
|
ret = kstrtobool(page, &tmp);
|
|
if (ret)
|
|
return ret;
|
|
if (tmp) {
|
|
ret = most_cfg_complete("sound");
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
snd_grp->create_card = tmp;
|
|
return count;
|
|
}
|
|
|
|
CONFIGFS_ATTR_WO(most_snd_grp_, create_card);
|
|
|
|
static struct configfs_attribute *most_snd_grp_attrs[] = {
|
|
&most_snd_grp_attr_create_card,
|
|
NULL,
|
|
};
|
|
|
|
static void most_snd_grp_release(struct config_item *item)
|
|
{
|
|
struct most_snd_grp *group = to_most_snd_grp(item);
|
|
|
|
list_del(&group->list);
|
|
kfree(group);
|
|
}
|
|
|
|
static struct configfs_item_operations most_snd_grp_item_ops = {
|
|
.release = most_snd_grp_release,
|
|
};
|
|
|
|
static struct configfs_group_operations most_snd_grp_group_ops = {
|
|
.make_item = most_snd_grp_make_item,
|
|
};
|
|
|
|
static const struct config_item_type most_snd_grp_type = {
|
|
.ct_item_ops = &most_snd_grp_item_ops,
|
|
.ct_group_ops = &most_snd_grp_group_ops,
|
|
.ct_attrs = most_snd_grp_attrs,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
struct most_sound {
|
|
struct configfs_subsystem subsys;
|
|
struct list_head soundcard_list;
|
|
struct module *mod;
|
|
};
|
|
|
|
static struct config_group *most_sound_make_group(struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct most_snd_grp *most;
|
|
struct most_sound *ms = container_of(group->cg_subsys,
|
|
struct most_sound, subsys);
|
|
|
|
list_for_each_entry(most, &ms->soundcard_list, list) {
|
|
if (!most->create_card) {
|
|
pr_info("adapter configuration still in progress.\n");
|
|
return ERR_PTR(-EPROTO);
|
|
}
|
|
}
|
|
if (!try_module_get(ms->mod))
|
|
return ERR_PTR(-ENOLCK);
|
|
most = kzalloc(sizeof(*most), GFP_KERNEL);
|
|
if (!most) {
|
|
module_put(ms->mod);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
config_group_init_type_name(&most->group, name, &most_snd_grp_type);
|
|
list_add_tail(&most->list, &ms->soundcard_list);
|
|
return &most->group;
|
|
}
|
|
|
|
static void most_sound_disconnect(struct config_group *group,
|
|
struct config_item *item)
|
|
{
|
|
struct most_sound *ms = container_of(group->cg_subsys,
|
|
struct most_sound, subsys);
|
|
module_put(ms->mod);
|
|
}
|
|
|
|
static struct configfs_group_operations most_sound_group_ops = {
|
|
.make_group = most_sound_make_group,
|
|
.disconnect_notify = most_sound_disconnect,
|
|
};
|
|
|
|
static const struct config_item_type most_sound_type = {
|
|
.ct_group_ops = &most_sound_group_ops,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
static struct most_sound most_sound_subsys = {
|
|
.subsys = {
|
|
.su_group = {
|
|
.cg_item = {
|
|
.ci_namebuf = "most_sound",
|
|
.ci_type = &most_sound_type,
|
|
},
|
|
},
|
|
},
|
|
};
|
|
|
|
int most_register_configfs_subsys(struct most_component *c)
|
|
{
|
|
int ret;
|
|
|
|
if (!strcmp(c->name, "cdev")) {
|
|
most_cdev.mod = c->mod;
|
|
ret = configfs_register_subsystem(&most_cdev.subsys);
|
|
} else if (!strcmp(c->name, "net")) {
|
|
most_net.mod = c->mod;
|
|
ret = configfs_register_subsystem(&most_net.subsys);
|
|
} else if (!strcmp(c->name, "video")) {
|
|
most_video.mod = c->mod;
|
|
ret = configfs_register_subsystem(&most_video.subsys);
|
|
} else if (!strcmp(c->name, "sound")) {
|
|
most_sound_subsys.mod = c->mod;
|
|
ret = configfs_register_subsystem(&most_sound_subsys.subsys);
|
|
} else {
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (ret) {
|
|
pr_err("Error %d while registering subsystem %s\n",
|
|
ret, c->name);
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(most_register_configfs_subsys);
|
|
|
|
void most_interface_register_notify(const char *mdev)
|
|
{
|
|
bool register_snd_card = false;
|
|
struct mdev_link *mdev_link;
|
|
|
|
list_for_each_entry(mdev_link, &mdev_link_list, list) {
|
|
if (!strcmp(mdev_link->device, mdev)) {
|
|
set_config_and_add_link(mdev_link);
|
|
if (!strcmp(mdev_link->comp, "sound"))
|
|
register_snd_card = true;
|
|
}
|
|
}
|
|
if (register_snd_card)
|
|
most_cfg_complete("sound");
|
|
}
|
|
|
|
void most_deregister_configfs_subsys(struct most_component *c)
|
|
{
|
|
if (!strcmp(c->name, "cdev"))
|
|
configfs_unregister_subsystem(&most_cdev.subsys);
|
|
else if (!strcmp(c->name, "net"))
|
|
configfs_unregister_subsystem(&most_net.subsys);
|
|
else if (!strcmp(c->name, "video"))
|
|
configfs_unregister_subsystem(&most_video.subsys);
|
|
else if (!strcmp(c->name, "sound"))
|
|
configfs_unregister_subsystem(&most_sound_subsys.subsys);
|
|
}
|
|
EXPORT_SYMBOL_GPL(most_deregister_configfs_subsys);
|
|
|
|
int __init configfs_init(void)
|
|
{
|
|
config_group_init(&most_cdev.subsys.su_group);
|
|
mutex_init(&most_cdev.subsys.su_mutex);
|
|
|
|
config_group_init(&most_net.subsys.su_group);
|
|
mutex_init(&most_net.subsys.su_mutex);
|
|
|
|
config_group_init(&most_video.subsys.su_group);
|
|
mutex_init(&most_video.subsys.su_mutex);
|
|
|
|
config_group_init(&most_sound_subsys.subsys.su_group);
|
|
mutex_init(&most_sound_subsys.subsys.su_mutex);
|
|
|
|
INIT_LIST_HEAD(&most_sound_subsys.soundcard_list);
|
|
INIT_LIST_HEAD(&mdev_link_list);
|
|
|
|
return 0;
|
|
}
|