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![Peter Rajnoha](/assets/img/avatar_default.png)
This patch makes it possible to pass additional arguments in addition to uevent action name when writing /sys/.../uevent attribute. These additional arguments are then inserted into generated synthetic uevent as additional environment variables. Before, we were not able to pass any additional uevent environment variables for synthetic uevents. This made it hard to identify such uevents properly in userspace to make proper distinction between genuine uevents originating from kernel and synthetic uevents triggered from userspace. Also, it was not possible to pass any additional information which would make it possible to optimize and change the way the synthetic uevents are processed back in userspace based on the originating environment of the triggering action in userspace. With the extra additional variables, we are able to pass through this extra information needed and also it makes it possible to synchronize with such synthetic uevents as they can be clearly identified back in userspace. The format for writing the uevent attribute is following: ACTION [UUID [KEY=VALUE ...] There's no change in how "ACTION" is recognized - it stays the same ("add", "change", "remove"). The "ACTION" is the only argument required to generate synthetic uevent, the rest of arguments, that this patch adds support for, are optional. The "UUID" is considered as transaction identifier so it's possible to use the same UUID value for one or more synthetic uevents in which case we logically group these uevents together for any userspace listeners. The "UUID" is expected to be in "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" format where "x" is a hex digit. The value appears in uevent as "SYNTH_UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" environment variable. The "KEY=VALUE" pairs can contain alphanumeric characters only. It's possible to define zero or more more pairs - each pair is then delimited by a space character " ". Each pair appears in synthetic uevents as "SYNTH_ARG_KEY=VALUE" environment variable. That means the KEY name gains "SYNTH_ARG_" prefix to avoid possible collisions with existing variables. To pass the "KEY=VALUE" pairs, it's also required to pass in the "UUID" part for the synthetic uevent first. If "UUID" is not passed in, the generated synthetic uevent gains "SYNTH_UUID=0" environment variable automatically so it's possible to identify this situation in userspace when reading generated uevent and so we can still make a difference between genuine and synthetic uevents. Signed-off-by: Peter Rajnoha <prajnoha@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
612 lines
14 KiB
C
612 lines
14 KiB
C
/*
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* kernel userspace event delivery
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*
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* Copyright (C) 2004 Red Hat, Inc. All rights reserved.
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* Copyright (C) 2004 Novell, Inc. All rights reserved.
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* Copyright (C) 2004 IBM, Inc. All rights reserved.
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*
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* Licensed under the GNU GPL v2.
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*
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* Authors:
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* Robert Love <rml@novell.com>
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* Kay Sievers <kay.sievers@vrfy.org>
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* Arjan van de Ven <arjanv@redhat.com>
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* Greg Kroah-Hartman <greg@kroah.com>
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*/
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/kobject.h>
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#include <linux/export.h>
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#include <linux/kmod.h>
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#include <linux/slab.h>
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#include <linux/socket.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/uuid.h>
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#include <linux/ctype.h>
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#include <net/sock.h>
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#include <net/net_namespace.h>
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u64 uevent_seqnum;
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#ifdef CONFIG_UEVENT_HELPER
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char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
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#endif
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#ifdef CONFIG_NET
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struct uevent_sock {
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struct list_head list;
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struct sock *sk;
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};
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static LIST_HEAD(uevent_sock_list);
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#endif
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/* This lock protects uevent_seqnum and uevent_sock_list */
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static DEFINE_MUTEX(uevent_sock_mutex);
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/* the strings here must match the enum in include/linux/kobject.h */
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static const char *kobject_actions[] = {
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[KOBJ_ADD] = "add",
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[KOBJ_REMOVE] = "remove",
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[KOBJ_CHANGE] = "change",
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[KOBJ_MOVE] = "move",
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[KOBJ_ONLINE] = "online",
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[KOBJ_OFFLINE] = "offline",
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};
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static int kobject_action_type(const char *buf, size_t count,
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enum kobject_action *type,
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const char **args)
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{
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enum kobject_action action;
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size_t count_first;
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const char *args_start;
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int ret = -EINVAL;
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if (count && (buf[count-1] == '\n' || buf[count-1] == '\0'))
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count--;
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if (!count)
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goto out;
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args_start = strnchr(buf, count, ' ');
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if (args_start) {
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count_first = args_start - buf;
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args_start = args_start + 1;
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} else
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count_first = count;
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for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) {
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if (strncmp(kobject_actions[action], buf, count_first) != 0)
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continue;
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if (kobject_actions[action][count_first] != '\0')
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continue;
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if (args)
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*args = args_start;
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*type = action;
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ret = 0;
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break;
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}
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out:
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return ret;
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}
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static const char *action_arg_word_end(const char *buf, const char *buf_end,
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char delim)
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{
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const char *next = buf;
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while (next <= buf_end && *next != delim)
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if (!isalnum(*next++))
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return NULL;
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if (next == buf)
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return NULL;
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return next;
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}
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static int kobject_action_args(const char *buf, size_t count,
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struct kobj_uevent_env **ret_env)
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{
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struct kobj_uevent_env *env = NULL;
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const char *next, *buf_end, *key;
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int key_len;
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int r = -EINVAL;
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if (count && (buf[count - 1] == '\n' || buf[count - 1] == '\0'))
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count--;
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if (!count)
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return -EINVAL;
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env = kzalloc(sizeof(*env), GFP_KERNEL);
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if (!env)
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return -ENOMEM;
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/* first arg is UUID */
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if (count < UUID_STRING_LEN || !uuid_is_valid(buf) ||
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add_uevent_var(env, "SYNTH_UUID=%.*s", UUID_STRING_LEN, buf))
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goto out;
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/*
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* the rest are custom environment variables in KEY=VALUE
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* format with ' ' delimiter between each KEY=VALUE pair
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*/
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next = buf + UUID_STRING_LEN;
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buf_end = buf + count - 1;
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while (next <= buf_end) {
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if (*next != ' ')
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goto out;
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/* skip the ' ', key must follow */
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key = ++next;
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if (key > buf_end)
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goto out;
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buf = next;
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next = action_arg_word_end(buf, buf_end, '=');
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if (!next || next > buf_end || *next != '=')
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goto out;
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key_len = next - buf;
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/* skip the '=', value must follow */
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if (++next > buf_end)
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goto out;
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buf = next;
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next = action_arg_word_end(buf, buf_end, ' ');
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if (!next)
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goto out;
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if (add_uevent_var(env, "SYNTH_ARG_%.*s=%.*s",
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key_len, key, (int) (next - buf), buf))
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goto out;
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}
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r = 0;
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out:
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if (r)
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kfree(env);
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else
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*ret_env = env;
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return r;
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}
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/**
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* kobject_synth_uevent - send synthetic uevent with arguments
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*
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* @kobj: struct kobject for which synthetic uevent is to be generated
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* @buf: buffer containing action type and action args, newline is ignored
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* @count: length of buffer
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*
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* Returns 0 if kobject_synthetic_uevent() is completed with success or the
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* corresponding error when it fails.
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*/
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int kobject_synth_uevent(struct kobject *kobj, const char *buf, size_t count)
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{
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char *no_uuid_envp[] = { "SYNTH_UUID=0", NULL };
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enum kobject_action action;
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const char *action_args;
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struct kobj_uevent_env *env;
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const char *msg = NULL, *devpath;
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int r;
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r = kobject_action_type(buf, count, &action, &action_args);
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if (r) {
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msg = "unknown uevent action string\n";
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goto out;
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}
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if (!action_args) {
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r = kobject_uevent_env(kobj, action, no_uuid_envp);
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goto out;
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}
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r = kobject_action_args(action_args,
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count - (action_args - buf), &env);
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if (r == -EINVAL) {
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msg = "incorrect uevent action arguments\n";
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goto out;
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}
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if (r)
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goto out;
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r = kobject_uevent_env(kobj, action, env->envp);
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kfree(env);
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out:
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if (r) {
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devpath = kobject_get_path(kobj, GFP_KERNEL);
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printk(KERN_WARNING "synth uevent: %s: %s",
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devpath ?: "unknown device",
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msg ?: "failed to send uevent");
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kfree(devpath);
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}
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return r;
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}
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#ifdef CONFIG_NET
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static int kobj_bcast_filter(struct sock *dsk, struct sk_buff *skb, void *data)
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{
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struct kobject *kobj = data, *ksobj;
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const struct kobj_ns_type_operations *ops;
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ops = kobj_ns_ops(kobj);
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if (!ops && kobj->kset) {
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ksobj = &kobj->kset->kobj;
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if (ksobj->parent != NULL)
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ops = kobj_ns_ops(ksobj->parent);
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}
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if (ops && ops->netlink_ns && kobj->ktype->namespace) {
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const void *sock_ns, *ns;
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ns = kobj->ktype->namespace(kobj);
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sock_ns = ops->netlink_ns(dsk);
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return sock_ns != ns;
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}
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return 0;
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}
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#endif
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#ifdef CONFIG_UEVENT_HELPER
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static int kobj_usermode_filter(struct kobject *kobj)
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{
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const struct kobj_ns_type_operations *ops;
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ops = kobj_ns_ops(kobj);
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if (ops) {
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const void *init_ns, *ns;
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ns = kobj->ktype->namespace(kobj);
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init_ns = ops->initial_ns();
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return ns != init_ns;
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}
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return 0;
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}
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static int init_uevent_argv(struct kobj_uevent_env *env, const char *subsystem)
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{
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int len;
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len = strlcpy(&env->buf[env->buflen], subsystem,
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sizeof(env->buf) - env->buflen);
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if (len >= (sizeof(env->buf) - env->buflen)) {
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WARN(1, KERN_ERR "init_uevent_argv: buffer size too small\n");
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return -ENOMEM;
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}
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env->argv[0] = uevent_helper;
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env->argv[1] = &env->buf[env->buflen];
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env->argv[2] = NULL;
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env->buflen += len + 1;
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return 0;
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}
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static void cleanup_uevent_env(struct subprocess_info *info)
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{
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kfree(info->data);
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}
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#endif
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/**
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* kobject_uevent_env - send an uevent with environmental data
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*
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* @kobj: struct kobject that the action is happening to
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* @action: action that is happening
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* @envp_ext: pointer to environmental data
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*
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* Returns 0 if kobject_uevent_env() is completed with success or the
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* corresponding error when it fails.
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*/
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int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
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char *envp_ext[])
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{
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struct kobj_uevent_env *env;
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const char *action_string = kobject_actions[action];
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const char *devpath = NULL;
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const char *subsystem;
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struct kobject *top_kobj;
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struct kset *kset;
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const struct kset_uevent_ops *uevent_ops;
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int i = 0;
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int retval = 0;
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#ifdef CONFIG_NET
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struct uevent_sock *ue_sk;
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#endif
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pr_debug("kobject: '%s' (%p): %s\n",
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kobject_name(kobj), kobj, __func__);
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/* search the kset we belong to */
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top_kobj = kobj;
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while (!top_kobj->kset && top_kobj->parent)
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top_kobj = top_kobj->parent;
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if (!top_kobj->kset) {
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pr_debug("kobject: '%s' (%p): %s: attempted to send uevent "
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"without kset!\n", kobject_name(kobj), kobj,
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__func__);
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return -EINVAL;
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}
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kset = top_kobj->kset;
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uevent_ops = kset->uevent_ops;
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/* skip the event, if uevent_suppress is set*/
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if (kobj->uevent_suppress) {
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pr_debug("kobject: '%s' (%p): %s: uevent_suppress "
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"caused the event to drop!\n",
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kobject_name(kobj), kobj, __func__);
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return 0;
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}
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/* skip the event, if the filter returns zero. */
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if (uevent_ops && uevent_ops->filter)
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if (!uevent_ops->filter(kset, kobj)) {
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pr_debug("kobject: '%s' (%p): %s: filter function "
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"caused the event to drop!\n",
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kobject_name(kobj), kobj, __func__);
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return 0;
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}
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/* originating subsystem */
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if (uevent_ops && uevent_ops->name)
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subsystem = uevent_ops->name(kset, kobj);
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else
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subsystem = kobject_name(&kset->kobj);
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if (!subsystem) {
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pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the "
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"event to drop!\n", kobject_name(kobj), kobj,
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__func__);
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return 0;
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}
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/* environment buffer */
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env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
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if (!env)
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return -ENOMEM;
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/* complete object path */
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devpath = kobject_get_path(kobj, GFP_KERNEL);
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if (!devpath) {
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retval = -ENOENT;
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goto exit;
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}
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/* default keys */
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retval = add_uevent_var(env, "ACTION=%s", action_string);
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if (retval)
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goto exit;
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retval = add_uevent_var(env, "DEVPATH=%s", devpath);
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if (retval)
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goto exit;
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retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem);
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if (retval)
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goto exit;
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/* keys passed in from the caller */
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if (envp_ext) {
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for (i = 0; envp_ext[i]; i++) {
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retval = add_uevent_var(env, "%s", envp_ext[i]);
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if (retval)
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goto exit;
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}
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}
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/* let the kset specific function add its stuff */
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if (uevent_ops && uevent_ops->uevent) {
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retval = uevent_ops->uevent(kset, kobj, env);
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if (retval) {
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pr_debug("kobject: '%s' (%p): %s: uevent() returned "
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"%d\n", kobject_name(kobj), kobj,
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__func__, retval);
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goto exit;
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}
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}
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/*
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* Mark "add" and "remove" events in the object to ensure proper
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* events to userspace during automatic cleanup. If the object did
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* send an "add" event, "remove" will automatically generated by
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* the core, if not already done by the caller.
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*/
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if (action == KOBJ_ADD)
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kobj->state_add_uevent_sent = 1;
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else if (action == KOBJ_REMOVE)
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kobj->state_remove_uevent_sent = 1;
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mutex_lock(&uevent_sock_mutex);
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/* we will send an event, so request a new sequence number */
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retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)++uevent_seqnum);
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if (retval) {
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mutex_unlock(&uevent_sock_mutex);
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goto exit;
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}
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#if defined(CONFIG_NET)
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/* send netlink message */
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list_for_each_entry(ue_sk, &uevent_sock_list, list) {
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struct sock *uevent_sock = ue_sk->sk;
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struct sk_buff *skb;
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size_t len;
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if (!netlink_has_listeners(uevent_sock, 1))
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continue;
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/* allocate message with the maximum possible size */
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len = strlen(action_string) + strlen(devpath) + 2;
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skb = alloc_skb(len + env->buflen, GFP_KERNEL);
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if (skb) {
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char *scratch;
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/* add header */
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scratch = skb_put(skb, len);
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sprintf(scratch, "%s@%s", action_string, devpath);
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/* copy keys to our continuous event payload buffer */
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for (i = 0; i < env->envp_idx; i++) {
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len = strlen(env->envp[i]) + 1;
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scratch = skb_put(skb, len);
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strcpy(scratch, env->envp[i]);
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}
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NETLINK_CB(skb).dst_group = 1;
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retval = netlink_broadcast_filtered(uevent_sock, skb,
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0, 1, GFP_KERNEL,
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kobj_bcast_filter,
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kobj);
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/* ENOBUFS should be handled in userspace */
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if (retval == -ENOBUFS || retval == -ESRCH)
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retval = 0;
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} else
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retval = -ENOMEM;
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}
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#endif
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mutex_unlock(&uevent_sock_mutex);
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#ifdef CONFIG_UEVENT_HELPER
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/* call uevent_helper, usually only enabled during early boot */
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if (uevent_helper[0] && !kobj_usermode_filter(kobj)) {
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struct subprocess_info *info;
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retval = add_uevent_var(env, "HOME=/");
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if (retval)
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goto exit;
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retval = add_uevent_var(env,
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"PATH=/sbin:/bin:/usr/sbin:/usr/bin");
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if (retval)
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goto exit;
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retval = init_uevent_argv(env, subsystem);
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if (retval)
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goto exit;
|
|
|
|
retval = -ENOMEM;
|
|
info = call_usermodehelper_setup(env->argv[0], env->argv,
|
|
env->envp, GFP_KERNEL,
|
|
NULL, cleanup_uevent_env, env);
|
|
if (info) {
|
|
retval = call_usermodehelper_exec(info, UMH_NO_WAIT);
|
|
env = NULL; /* freed by cleanup_uevent_env */
|
|
}
|
|
}
|
|
#endif
|
|
|
|
exit:
|
|
kfree(devpath);
|
|
kfree(env);
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(kobject_uevent_env);
|
|
|
|
/**
|
|
* kobject_uevent - notify userspace by sending an uevent
|
|
*
|
|
* @kobj: struct kobject that the action is happening to
|
|
* @action: action that is happening
|
|
*
|
|
* Returns 0 if kobject_uevent() is completed with success or the
|
|
* corresponding error when it fails.
|
|
*/
|
|
int kobject_uevent(struct kobject *kobj, enum kobject_action action)
|
|
{
|
|
return kobject_uevent_env(kobj, action, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(kobject_uevent);
|
|
|
|
/**
|
|
* add_uevent_var - add key value string to the environment buffer
|
|
* @env: environment buffer structure
|
|
* @format: printf format for the key=value pair
|
|
*
|
|
* Returns 0 if environment variable was added successfully or -ENOMEM
|
|
* if no space was available.
|
|
*/
|
|
int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
|
|
{
|
|
va_list args;
|
|
int len;
|
|
|
|
if (env->envp_idx >= ARRAY_SIZE(env->envp)) {
|
|
WARN(1, KERN_ERR "add_uevent_var: too many keys\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
va_start(args, format);
|
|
len = vsnprintf(&env->buf[env->buflen],
|
|
sizeof(env->buf) - env->buflen,
|
|
format, args);
|
|
va_end(args);
|
|
|
|
if (len >= (sizeof(env->buf) - env->buflen)) {
|
|
WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
env->envp[env->envp_idx++] = &env->buf[env->buflen];
|
|
env->buflen += len + 1;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(add_uevent_var);
|
|
|
|
#if defined(CONFIG_NET)
|
|
static int uevent_net_init(struct net *net)
|
|
{
|
|
struct uevent_sock *ue_sk;
|
|
struct netlink_kernel_cfg cfg = {
|
|
.groups = 1,
|
|
.flags = NL_CFG_F_NONROOT_RECV,
|
|
};
|
|
|
|
ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL);
|
|
if (!ue_sk)
|
|
return -ENOMEM;
|
|
|
|
ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT, &cfg);
|
|
if (!ue_sk->sk) {
|
|
printk(KERN_ERR
|
|
"kobject_uevent: unable to create netlink socket!\n");
|
|
kfree(ue_sk);
|
|
return -ENODEV;
|
|
}
|
|
mutex_lock(&uevent_sock_mutex);
|
|
list_add_tail(&ue_sk->list, &uevent_sock_list);
|
|
mutex_unlock(&uevent_sock_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static void uevent_net_exit(struct net *net)
|
|
{
|
|
struct uevent_sock *ue_sk;
|
|
|
|
mutex_lock(&uevent_sock_mutex);
|
|
list_for_each_entry(ue_sk, &uevent_sock_list, list) {
|
|
if (sock_net(ue_sk->sk) == net)
|
|
goto found;
|
|
}
|
|
mutex_unlock(&uevent_sock_mutex);
|
|
return;
|
|
|
|
found:
|
|
list_del(&ue_sk->list);
|
|
mutex_unlock(&uevent_sock_mutex);
|
|
|
|
netlink_kernel_release(ue_sk->sk);
|
|
kfree(ue_sk);
|
|
}
|
|
|
|
static struct pernet_operations uevent_net_ops = {
|
|
.init = uevent_net_init,
|
|
.exit = uevent_net_exit,
|
|
};
|
|
|
|
static int __init kobject_uevent_init(void)
|
|
{
|
|
return register_pernet_subsys(&uevent_net_ops);
|
|
}
|
|
|
|
|
|
postcore_initcall(kobject_uevent_init);
|
|
#endif
|