d9d16e16a3f82 (Greg Kroah-Hartman 2017-11-07 17:30:05 +0100 1) // SPDX-License-Identifier: GPL-2.0
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 2) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 3) * kernel userspace event delivery
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 4) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 5) * Copyright (C) 2004 Red Hat, Inc. All rights reserved.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 6) * Copyright (C) 2004 Novell, Inc. All rights reserved.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 7) * Copyright (C) 2004 IBM, Inc. All rights reserved.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 8) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 9) * Authors:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 10) * Robert Love <rml@novell.com>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 11) * Kay Sievers <kay.sievers@vrfy.org>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 12) * Arjan van de Ven <arjanv@redhat.com>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 13) * Greg Kroah-Hartman <greg@kroah.com>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 14) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 15)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 16) #include <linux/spinlock.h>
2d38f9a4f8d2e (Denis V. Lunev 2008-03-27 14:26:30 -0700 17) #include <linux/string.h>
2d38f9a4f8d2e (Denis V. Lunev 2008-03-27 14:26:30 -0700 18) #include <linux/kobject.h>
8bc3bcc93a2b4 (Paul Gortmaker 2011-11-16 21:29:17 -0500 19) #include <linux/export.h>
8bc3bcc93a2b4 (Paul Gortmaker 2011-11-16 21:29:17 -0500 20) #include <linux/kmod.h>
5a0e3ad6af866 (Tejun Heo 2010-03-24 17:04:11 +0900 21) #include <linux/slab.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 22) #include <linux/socket.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 23) #include <linux/skbuff.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 24) #include <linux/netlink.h>
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 25) #include <linux/uidgid.h>
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 26) #include <linux/uuid.h>
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 27) #include <linux/ctype.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 28) #include <net/sock.h>
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 29) #include <net/netlink.h>
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 30) #include <net/net_namespace.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 31)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 32)
cd030c4cb3ee0 (Cornelia Huck 2007-07-20 13:58:13 +0200 33) u64 uevent_seqnum;
86d56134f1b67 (Michael Marineau 2014-04-10 14:09:31 -0700 34) #ifdef CONFIG_UEVENT_HELPER
6a8d8abb6e449 (Kay Sievers 2007-08-15 15:38:28 +0200 35) char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
86d56134f1b67 (Michael Marineau 2014-04-10 14:09:31 -0700 36) #endif
94e5e3087a67c (Christian Brauner 2018-03-19 13:17:30 +0100 37)
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 38) struct uevent_sock {
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 39) struct list_head list;
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 40) struct sock *sk;
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 41) };
94e5e3087a67c (Christian Brauner 2018-03-19 13:17:30 +0100 42)
94e5e3087a67c (Christian Brauner 2018-03-19 13:17:30 +0100 43) #ifdef CONFIG_NET
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 44) static LIST_HEAD(uevent_sock_list);
cd030c4cb3ee0 (Cornelia Huck 2007-07-20 13:58:13 +0200 45) #endif
cd030c4cb3ee0 (Cornelia Huck 2007-07-20 13:58:13 +0200 46)
7b60a18da393e (Andrew Vagin 2012-03-07 14:49:56 +0400 47) /* This lock protects uevent_seqnum and uevent_sock_list */
7b60a18da393e (Andrew Vagin 2012-03-07 14:49:56 +0400 48) static DEFINE_MUTEX(uevent_sock_mutex);
7b60a18da393e (Andrew Vagin 2012-03-07 14:49:56 +0400 49)
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 50) /* the strings here must match the enum in include/linux/kobject.h */
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 51) static const char *kobject_actions[] = {
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 52) [KOBJ_ADD] = "add",
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 53) [KOBJ_REMOVE] = "remove",
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 54) [KOBJ_CHANGE] = "change",
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 55) [KOBJ_MOVE] = "move",
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 56) [KOBJ_ONLINE] = "online",
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 57) [KOBJ_OFFLINE] = "offline",
1455cf8dbfd06 (Dmitry Torokhov 2017-07-19 17:24:30 -0700 58) [KOBJ_BIND] = "bind",
1455cf8dbfd06 (Dmitry Torokhov 2017-07-19 17:24:30 -0700 59) [KOBJ_UNBIND] = "unbind",
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 60) };
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 61)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 62) static int kobject_action_type(const char *buf, size_t count,
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 63) enum kobject_action *type,
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 64) const char **args)
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 65) {
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 66) enum kobject_action action;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 67) size_t count_first;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 68) const char *args_start;
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 69) int ret = -EINVAL;
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 70)
a9edadbf790d7 (Mark Lord 2008-03-28 19:05:25 -0400 71) if (count && (buf[count-1] == '\n' || buf[count-1] == '\0'))
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 72) count--;
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 73)
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 74) if (!count)
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 75) goto out;
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 76)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 77) args_start = strnchr(buf, count, ' ');
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 78) if (args_start) {
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 79) count_first = args_start - buf;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 80) args_start = args_start + 1;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 81) } else
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 82) count_first = count;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 83)
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 84) for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) {
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 85) if (strncmp(kobject_actions[action], buf, count_first) != 0)
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 86) continue;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 87) if (kobject_actions[action][count_first] != '\0')
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 88) continue;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 89) if (args)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 90) *args = args_start;
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 91) *type = action;
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 92) ret = 0;
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 93) break;
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 94) }
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 95) out:
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 96) return ret;
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 97) }
5c5daf657cb5f (Kay Sievers 2007-08-12 20:43:55 +0200 98)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 99) static const char *action_arg_word_end(const char *buf, const char *buf_end,
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 100) char delim)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 101) {
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 102) const char *next = buf;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 103)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 104) while (next <= buf_end && *next != delim)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 105) if (!isalnum(*next++))
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 106) return NULL;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 107)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 108) if (next == buf)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 109) return NULL;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 110)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 111) return next;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 112) }
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 113)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 114) static int kobject_action_args(const char *buf, size_t count,
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 115) struct kobj_uevent_env **ret_env)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 116) {
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 117) struct kobj_uevent_env *env = NULL;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 118) const char *next, *buf_end, *key;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 119) int key_len;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 120) int r = -EINVAL;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 121)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 122) if (count && (buf[count - 1] == '\n' || buf[count - 1] == '\0'))
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 123) count--;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 124)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 125) if (!count)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 126) return -EINVAL;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 127)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 128) env = kzalloc(sizeof(*env), GFP_KERNEL);
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 129) if (!env)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 130) return -ENOMEM;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 131)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 132) /* first arg is UUID */
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 133) if (count < UUID_STRING_LEN || !uuid_is_valid(buf) ||
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 134) add_uevent_var(env, "SYNTH_UUID=%.*s", UUID_STRING_LEN, buf))
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 135) goto out;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 136)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 137) /*
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 138) * the rest are custom environment variables in KEY=VALUE
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 139) * format with ' ' delimiter between each KEY=VALUE pair
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 140) */
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 141) next = buf + UUID_STRING_LEN;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 142) buf_end = buf + count - 1;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 143)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 144) while (next <= buf_end) {
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 145) if (*next != ' ')
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 146) goto out;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 147)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 148) /* skip the ' ', key must follow */
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 149) key = ++next;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 150) if (key > buf_end)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 151) goto out;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 152)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 153) buf = next;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 154) next = action_arg_word_end(buf, buf_end, '=');
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 155) if (!next || next > buf_end || *next != '=')
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 156) goto out;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 157) key_len = next - buf;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 158)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 159) /* skip the '=', value must follow */
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 160) if (++next > buf_end)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 161) goto out;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 162)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 163) buf = next;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 164) next = action_arg_word_end(buf, buf_end, ' ');
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 165) if (!next)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 166) goto out;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 167)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 168) if (add_uevent_var(env, "SYNTH_ARG_%.*s=%.*s",
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 169) key_len, key, (int) (next - buf), buf))
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 170) goto out;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 171) }
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 172)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 173) r = 0;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 174) out:
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 175) if (r)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 176) kfree(env);
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 177) else
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 178) *ret_env = env;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 179) return r;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 180) }
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 181)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 182) /**
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 183) * kobject_synth_uevent - send synthetic uevent with arguments
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 184) *
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 185) * @kobj: struct kobject for which synthetic uevent is to be generated
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 186) * @buf: buffer containing action type and action args, newline is ignored
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 187) * @count: length of buffer
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 188) *
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 189) * Returns 0 if kobject_synthetic_uevent() is completed with success or the
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 190) * corresponding error when it fails.
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 191) */
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 192) int kobject_synth_uevent(struct kobject *kobj, const char *buf, size_t count)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 193) {
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 194) char *no_uuid_envp[] = { "SYNTH_UUID=0", NULL };
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 195) enum kobject_action action;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 196) const char *action_args;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 197) struct kobj_uevent_env *env;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 198) const char *msg = NULL, *devpath;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 199) int r;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 200)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 201) r = kobject_action_type(buf, count, &action, &action_args);
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 202) if (r) {
549ad24374c0f (Bo YU 2019-01-09 04:17:48 -0500 203) msg = "unknown uevent action string";
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 204) goto out;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 205) }
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 206)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 207) if (!action_args) {
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 208) r = kobject_uevent_env(kobj, action, no_uuid_envp);
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 209) goto out;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 210) }
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 211)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 212) r = kobject_action_args(action_args,
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 213) count - (action_args - buf), &env);
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 214) if (r == -EINVAL) {
549ad24374c0f (Bo YU 2019-01-09 04:17:48 -0500 215) msg = "incorrect uevent action arguments";
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 216) goto out;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 217) }
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 218)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 219) if (r)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 220) goto out;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 221)
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 222) r = kobject_uevent_env(kobj, action, env->envp);
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 223) kfree(env);
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 224) out:
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 225) if (r) {
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 226) devpath = kobject_get_path(kobj, GFP_KERNEL);
549ad24374c0f (Bo YU 2019-01-09 04:17:48 -0500 227) pr_warn("synth uevent: %s: %s\n",
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 228) devpath ?: "unknown device",
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 229) msg ?: "failed to send uevent");
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 230) kfree(devpath);
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 231) }
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 232) return r;
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 233) }
f36776fafbaa0 (Peter Rajnoha 2017-05-09 15:22:30 +0200 234)
86d56134f1b67 (Michael Marineau 2014-04-10 14:09:31 -0700 235) #ifdef CONFIG_UEVENT_HELPER
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 236) static int kobj_usermode_filter(struct kobject *kobj)
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 237) {
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 238) const struct kobj_ns_type_operations *ops;
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 239)
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 240) ops = kobj_ns_ops(kobj);
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 241) if (ops) {
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 242) const void *init_ns, *ns;
6be244dcd59b0 (Bo YU 2018-10-30 08:01:15 -0400 243)
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 244) ns = kobj->ktype->namespace(kobj);
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 245) init_ns = ops->initial_ns();
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 246) return ns != init_ns;
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 247) }
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 248)
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 249) return 0;
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 250) }
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 251)
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 252) static int init_uevent_argv(struct kobj_uevent_env *env, const char *subsystem)
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 253) {
b4104180a2efb (Greg Kroah-Hartman 2021-04-05 11:48:52 +0200 254) int buffer_size = sizeof(env->buf) - env->buflen;
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 255) int len;
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 256)
b4104180a2efb (Greg Kroah-Hartman 2021-04-05 11:48:52 +0200 257) len = strlcpy(&env->buf[env->buflen], subsystem, buffer_size);
b4104180a2efb (Greg Kroah-Hartman 2021-04-05 11:48:52 +0200 258) if (len >= buffer_size) {
b4104180a2efb (Greg Kroah-Hartman 2021-04-05 11:48:52 +0200 259) pr_warn("init_uevent_argv: buffer size of %d too small, needed %d\n",
b4104180a2efb (Greg Kroah-Hartman 2021-04-05 11:48:52 +0200 260) buffer_size, len);
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 261) return -ENOMEM;
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 262) }
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 263)
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 264) env->argv[0] = uevent_helper;
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 265) env->argv[1] = &env->buf[env->buflen];
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 266) env->argv[2] = NULL;
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 267)
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 268) env->buflen += len + 1;
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 269) return 0;
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 270) }
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 271)
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 272) static void cleanup_uevent_env(struct subprocess_info *info)
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 273) {
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 274) kfree(info->data);
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 275) }
86d56134f1b67 (Michael Marineau 2014-04-10 14:09:31 -0700 276) #endif
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 277)
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 278) #ifdef CONFIG_NET
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 279) static struct sk_buff *alloc_uevent_skb(struct kobj_uevent_env *env,
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 280) const char *action_string,
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 281) const char *devpath)
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 282) {
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 283) struct netlink_skb_parms *parms;
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 284) struct sk_buff *skb = NULL;
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 285) char *scratch;
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 286) size_t len;
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 287)
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 288) /* allocate message with maximum possible size */
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 289) len = strlen(action_string) + strlen(devpath) + 2;
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 290) skb = alloc_skb(len + env->buflen, GFP_KERNEL);
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 291) if (!skb)
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 292) return NULL;
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 293)
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 294) /* add header */
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 295) scratch = skb_put(skb, len);
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 296) sprintf(scratch, "%s@%s", action_string, devpath);
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 297)
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 298) skb_put_data(skb, env->buf, env->buflen);
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 299)
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 300) parms = &NETLINK_CB(skb);
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 301) parms->creds.uid = GLOBAL_ROOT_UID;
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 302) parms->creds.gid = GLOBAL_ROOT_GID;
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 303) parms->dst_group = 1;
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 304) parms->portid = 0;
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 305)
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 306) return skb;
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 307) }
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 308)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 309) static int uevent_net_broadcast_untagged(struct kobj_uevent_env *env,
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 310) const char *action_string,
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 311) const char *devpath)
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 312) {
d464e84eed029 (Eric Dumazet 2017-09-19 16:27:05 -0700 313) struct sk_buff *skb = NULL;
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 314) struct uevent_sock *ue_sk;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 315) int retval = 0;
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 316)
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 317) /* send netlink message */
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 318) list_for_each_entry(ue_sk, &uevent_sock_list, list) {
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 319) struct sock *uevent_sock = ue_sk->sk;
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 320)
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 321) if (!netlink_has_listeners(uevent_sock, 1))
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 322) continue;
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 323)
d464e84eed029 (Eric Dumazet 2017-09-19 16:27:05 -0700 324) if (!skb) {
d464e84eed029 (Eric Dumazet 2017-09-19 16:27:05 -0700 325) retval = -ENOMEM;
26045a7b14bc7 (Christian Brauner 2018-04-29 12:44:11 +0200 326) skb = alloc_uevent_skb(env, action_string, devpath);
d464e84eed029 (Eric Dumazet 2017-09-19 16:27:05 -0700 327) if (!skb)
d464e84eed029 (Eric Dumazet 2017-09-19 16:27:05 -0700 328) continue;
d464e84eed029 (Eric Dumazet 2017-09-19 16:27:05 -0700 329) }
d464e84eed029 (Eric Dumazet 2017-09-19 16:27:05 -0700 330)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 331) retval = netlink_broadcast(uevent_sock, skb_get(skb), 0, 1,
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 332) GFP_KERNEL);
d464e84eed029 (Eric Dumazet 2017-09-19 16:27:05 -0700 333) /* ENOBUFS should be handled in userspace */
d464e84eed029 (Eric Dumazet 2017-09-19 16:27:05 -0700 334) if (retval == -ENOBUFS || retval == -ESRCH)
d464e84eed029 (Eric Dumazet 2017-09-19 16:27:05 -0700 335) retval = 0;
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 336) }
d464e84eed029 (Eric Dumazet 2017-09-19 16:27:05 -0700 337) consume_skb(skb);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 338)
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 339) return retval;
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 340) }
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 341)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 342) static int uevent_net_broadcast_tagged(struct sock *usk,
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 343) struct kobj_uevent_env *env,
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 344) const char *action_string,
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 345) const char *devpath)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 346) {
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 347) struct user_namespace *owning_user_ns = sock_net(usk)->user_ns;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 348) struct sk_buff *skb = NULL;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 349) int ret = 0;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 350)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 351) skb = alloc_uevent_skb(env, action_string, devpath);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 352) if (!skb)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 353) return -ENOMEM;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 354)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 355) /* fix credentials */
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 356) if (owning_user_ns != &init_user_ns) {
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 357) struct netlink_skb_parms *parms = &NETLINK_CB(skb);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 358) kuid_t root_uid;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 359) kgid_t root_gid;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 360)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 361) /* fix uid */
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 362) root_uid = make_kuid(owning_user_ns, 0);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 363) if (uid_valid(root_uid))
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 364) parms->creds.uid = root_uid;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 365)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 366) /* fix gid */
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 367) root_gid = make_kgid(owning_user_ns, 0);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 368) if (gid_valid(root_gid))
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 369) parms->creds.gid = root_gid;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 370) }
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 371)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 372) ret = netlink_broadcast(usk, skb, 0, 1, GFP_KERNEL);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 373) /* ENOBUFS should be handled in userspace */
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 374) if (ret == -ENOBUFS || ret == -ESRCH)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 375) ret = 0;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 376)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 377) return ret;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 378) }
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 379) #endif
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 380)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 381) static int kobject_uevent_net_broadcast(struct kobject *kobj,
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 382) struct kobj_uevent_env *env,
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 383) const char *action_string,
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 384) const char *devpath)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 385) {
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 386) int ret = 0;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 387)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 388) #ifdef CONFIG_NET
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 389) const struct kobj_ns_type_operations *ops;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 390) const struct net *net = NULL;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 391)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 392) ops = kobj_ns_ops(kobj);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 393) if (!ops && kobj->kset) {
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 394) struct kobject *ksobj = &kobj->kset->kobj;
6be244dcd59b0 (Bo YU 2018-10-30 08:01:15 -0400 395)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 396) if (ksobj->parent != NULL)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 397) ops = kobj_ns_ops(ksobj->parent);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 398) }
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 399)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 400) /* kobjects currently only carry network namespace tags and they
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 401) * are the only tag relevant here since we want to decide which
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 402) * network namespaces to broadcast the uevent into.
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 403) */
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 404) if (ops && ops->netlink_ns && kobj->ktype->namespace)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 405) if (ops->type == KOBJ_NS_TYPE_NET)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 406) net = kobj->ktype->namespace(kobj);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 407)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 408) if (!net)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 409) ret = uevent_net_broadcast_untagged(env, action_string,
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 410) devpath);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 411) else
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 412) ret = uevent_net_broadcast_tagged(net->uevent_sock->sk, env,
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 413) action_string, devpath);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 414) #endif
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 415)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 416) return ret;
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 417) }
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 418)
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 419) static void zap_modalias_env(struct kobj_uevent_env *env)
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 420) {
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 421) static const char modalias_prefix[] = "MODALIAS=";
9b3fa47d4a76b (Dmitry Torokhov 2017-12-13 15:21:22 -0800 422) size_t len;
9b3fa47d4a76b (Dmitry Torokhov 2017-12-13 15:21:22 -0800 423) int i, j;
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 424)
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 425) for (i = 0; i < env->envp_idx;) {
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 426) if (strncmp(env->envp[i], modalias_prefix,
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 427) sizeof(modalias_prefix) - 1)) {
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 428) i++;
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 429) continue;
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 430) }
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 431)
9b3fa47d4a76b (Dmitry Torokhov 2017-12-13 15:21:22 -0800 432) len = strlen(env->envp[i]) + 1;
9b3fa47d4a76b (Dmitry Torokhov 2017-12-13 15:21:22 -0800 433)
9b3fa47d4a76b (Dmitry Torokhov 2017-12-13 15:21:22 -0800 434) if (i != env->envp_idx - 1) {
9b3fa47d4a76b (Dmitry Torokhov 2017-12-13 15:21:22 -0800 435) memmove(env->envp[i], env->envp[i + 1],
9b3fa47d4a76b (Dmitry Torokhov 2017-12-13 15:21:22 -0800 436) env->buflen - len);
9b3fa47d4a76b (Dmitry Torokhov 2017-12-13 15:21:22 -0800 437)
9b3fa47d4a76b (Dmitry Torokhov 2017-12-13 15:21:22 -0800 438) for (j = i; j < env->envp_idx - 1; j++)
9b3fa47d4a76b (Dmitry Torokhov 2017-12-13 15:21:22 -0800 439) env->envp[j] = env->envp[j + 1] - len;
9b3fa47d4a76b (Dmitry Torokhov 2017-12-13 15:21:22 -0800 440) }
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 441)
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 442) env->envp_idx--;
9b3fa47d4a76b (Dmitry Torokhov 2017-12-13 15:21:22 -0800 443) env->buflen -= len;
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 444) }
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 445) }
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 446)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 447) /**
8a82472f86bf6 (Cornelia Huck 2006-11-20 17:07:51 +0100 448) * kobject_uevent_env - send an uevent with environmental data
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 449) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 450) * @kobj: struct kobject that the action is happening to
edbbf994bde89 (Julia Lawall 2016-10-01 21:46:28 +0200 451) * @action: action that is happening
8a82472f86bf6 (Cornelia Huck 2006-11-20 17:07:51 +0100 452) * @envp_ext: pointer to environmental data
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 453) *
f6e6e7799ebca (Xiaotian Feng 2010-08-13 18:58:10 +0800 454) * Returns 0 if kobject_uevent_env() is completed with success or the
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 455) * corresponding error when it fails.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 456) */
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 457) int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 458) char *envp_ext[])
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 459) {
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 460) struct kobj_uevent_env *env;
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 461) const char *action_string = kobject_actions[action];
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 462) const char *devpath = NULL;
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 463) const char *subsystem;
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 464) struct kobject *top_kobj;
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 465) struct kset *kset;
9cd43611ccfb4 (Emese Revfy 2009-12-31 14:52:51 +0100 466) const struct kset_uevent_ops *uevent_ops;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 467) int i = 0;
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 468) int retval = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 469)
c03a0fd0b609e (Tetsuo Handa 2019-03-17 14:02:31 +0900 470) /*
c03a0fd0b609e (Tetsuo Handa 2019-03-17 14:02:31 +0900 471) * Mark "remove" event done regardless of result, for some subsystems
c03a0fd0b609e (Tetsuo Handa 2019-03-17 14:02:31 +0900 472) * do not want to re-trigger "remove" event via automatic cleanup.
c03a0fd0b609e (Tetsuo Handa 2019-03-17 14:02:31 +0900 473) */
c03a0fd0b609e (Tetsuo Handa 2019-03-17 14:02:31 +0900 474) if (action == KOBJ_REMOVE)
c03a0fd0b609e (Tetsuo Handa 2019-03-17 14:02:31 +0900 475) kobj->state_remove_uevent_sent = 1;
c03a0fd0b609e (Tetsuo Handa 2019-03-17 14:02:31 +0900 476)
9f66fa2a4690a (Greg Kroah-Hartman 2007-11-28 23:49:41 -0800 477) pr_debug("kobject: '%s' (%p): %s\n",
810304db75b0c (Harvey Harrison 2008-04-30 00:55:08 -0700 478) kobject_name(kobj), kobj, __func__);
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 479)
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 480) /* search the kset we belong to */
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 481) top_kobj = kobj;
ccd490a3c3d9c (Kay Sievers 2007-08-12 20:43:55 +0200 482) while (!top_kobj->kset && top_kobj->parent)
14193fb91a7d8 (John Anthony Kazos Jr 2007-04-04 07:39:17 -0400 483) top_kobj = top_kobj->parent;
ccd490a3c3d9c (Kay Sievers 2007-08-12 20:43:55 +0200 484)
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 485) if (!top_kobj->kset) {
9f66fa2a4690a (Greg Kroah-Hartman 2007-11-28 23:49:41 -0800 486) pr_debug("kobject: '%s' (%p): %s: attempted to send uevent "
9f66fa2a4690a (Greg Kroah-Hartman 2007-11-28 23:49:41 -0800 487) "without kset!\n", kobject_name(kobj), kobj,
810304db75b0c (Harvey Harrison 2008-04-30 00:55:08 -0700 488) __func__);
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 489) return -EINVAL;
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 490) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 491)
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 492) kset = top_kobj->kset;
312c004d36ce6 (Kay Sievers 2005-11-16 09:00:00 +0100 493) uevent_ops = kset->uevent_ops;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 494)
f67f129e519fa (Ming Lei 2009-03-01 21:10:49 +0800 495) /* skip the event, if uevent_suppress is set*/
f67f129e519fa (Ming Lei 2009-03-01 21:10:49 +0800 496) if (kobj->uevent_suppress) {
f67f129e519fa (Ming Lei 2009-03-01 21:10:49 +0800 497) pr_debug("kobject: '%s' (%p): %s: uevent_suppress "
f67f129e519fa (Ming Lei 2009-03-01 21:10:49 +0800 498) "caused the event to drop!\n",
f67f129e519fa (Ming Lei 2009-03-01 21:10:49 +0800 499) kobject_name(kobj), kobj, __func__);
f67f129e519fa (Ming Lei 2009-03-01 21:10:49 +0800 500) return 0;
f67f129e519fa (Ming Lei 2009-03-01 21:10:49 +0800 501) }
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 502) /* skip the event, if the filter returns zero. */
312c004d36ce6 (Kay Sievers 2005-11-16 09:00:00 +0100 503) if (uevent_ops && uevent_ops->filter)
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 504) if (!uevent_ops->filter(kset, kobj)) {
9f66fa2a4690a (Greg Kroah-Hartman 2007-11-28 23:49:41 -0800 505) pr_debug("kobject: '%s' (%p): %s: filter function "
9f66fa2a4690a (Greg Kroah-Hartman 2007-11-28 23:49:41 -0800 506) "caused the event to drop!\n",
810304db75b0c (Harvey Harrison 2008-04-30 00:55:08 -0700 507) kobject_name(kobj), kobj, __func__);
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 508) return 0;
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 509) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 510)
864062457a2e4 (Kay Sievers 2007-03-14 03:25:56 +0100 511) /* originating subsystem */
864062457a2e4 (Kay Sievers 2007-03-14 03:25:56 +0100 512) if (uevent_ops && uevent_ops->name)
864062457a2e4 (Kay Sievers 2007-03-14 03:25:56 +0100 513) subsystem = uevent_ops->name(kset, kobj);
864062457a2e4 (Kay Sievers 2007-03-14 03:25:56 +0100 514) else
864062457a2e4 (Kay Sievers 2007-03-14 03:25:56 +0100 515) subsystem = kobject_name(&kset->kobj);
864062457a2e4 (Kay Sievers 2007-03-14 03:25:56 +0100 516) if (!subsystem) {
9f66fa2a4690a (Greg Kroah-Hartman 2007-11-28 23:49:41 -0800 517) pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the "
9f66fa2a4690a (Greg Kroah-Hartman 2007-11-28 23:49:41 -0800 518) "event to drop!\n", kobject_name(kobj), kobj,
810304db75b0c (Harvey Harrison 2008-04-30 00:55:08 -0700 519) __func__);
864062457a2e4 (Kay Sievers 2007-03-14 03:25:56 +0100 520) return 0;
864062457a2e4 (Kay Sievers 2007-03-14 03:25:56 +0100 521) }
864062457a2e4 (Kay Sievers 2007-03-14 03:25:56 +0100 522)
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 523) /* environment buffer */
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 524) env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 525) if (!env)
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 526) return -ENOMEM;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 527)
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 528) /* complete object path */
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 529) devpath = kobject_get_path(kobj, GFP_KERNEL);
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 530) if (!devpath) {
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 531) retval = -ENOENT;
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 532) goto exit;
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 533) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 534)
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 535) /* default keys */
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 536) retval = add_uevent_var(env, "ACTION=%s", action_string);
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 537) if (retval)
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 538) goto exit;
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 539) retval = add_uevent_var(env, "DEVPATH=%s", devpath);
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 540) if (retval)
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 541) goto exit;
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 542) retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem);
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 543) if (retval)
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 544) goto exit;
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 545)
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 546) /* keys passed in from the caller */
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 547) if (envp_ext) {
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 548) for (i = 0; envp_ext[i]; i++) {
c65b9145f40da (Tejun Heo 2008-11-13 13:20:00 +0900 549) retval = add_uevent_var(env, "%s", envp_ext[i]);
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 550) if (retval)
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 551) goto exit;
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 552) }
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 553) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 554)
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 555) /* let the kset specific function add its stuff */
312c004d36ce6 (Kay Sievers 2005-11-16 09:00:00 +0100 556) if (uevent_ops && uevent_ops->uevent) {
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 557) retval = uevent_ops->uevent(kset, kobj, env);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 558) if (retval) {
9f66fa2a4690a (Greg Kroah-Hartman 2007-11-28 23:49:41 -0800 559) pr_debug("kobject: '%s' (%p): %s: uevent() returned "
9f66fa2a4690a (Greg Kroah-Hartman 2007-11-28 23:49:41 -0800 560) "%d\n", kobject_name(kobj), kobj,
810304db75b0c (Harvey Harrison 2008-04-30 00:55:08 -0700 561) __func__, retval);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 562) goto exit;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 563) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 564) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 565)
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 566) switch (action) {
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 567) case KOBJ_ADD:
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 568) /*
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 569) * Mark "add" event so we can make sure we deliver "remove"
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 570) * event to userspace during automatic cleanup. If
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 571) * the object did send an "add" event, "remove" will
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 572) * automatically generated by the core, if not already done
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 573) * by the caller.
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 574) */
0f4dafc0563c6 (Kay Sievers 2007-12-19 01:40:42 +0100 575) kobj->state_add_uevent_sent = 1;
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 576) break;
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 577)
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 578) case KOBJ_UNBIND:
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 579) zap_modalias_env(env);
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 580) break;
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 581)
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 582) default:
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 583) break;
6878e7de6af72 (Dmitry Torokhov 2017-09-13 16:29:48 -0700 584) }
0f4dafc0563c6 (Kay Sievers 2007-12-19 01:40:42 +0100 585)
7b60a18da393e (Andrew Vagin 2012-03-07 14:49:56 +0400 586) mutex_lock(&uevent_sock_mutex);
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 587) /* we will send an event, so request a new sequence number */
e0d70bcb38d7e (Bo YU 2018-10-30 08:01:14 -0400 588) retval = add_uevent_var(env, "SEQNUM=%llu", ++uevent_seqnum);
7b60a18da393e (Andrew Vagin 2012-03-07 14:49:56 +0400 589) if (retval) {
7b60a18da393e (Andrew Vagin 2012-03-07 14:49:56 +0400 590) mutex_unlock(&uevent_sock_mutex);
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 591) goto exit;
7b60a18da393e (Andrew Vagin 2012-03-07 14:49:56 +0400 592) }
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 593) retval = kobject_uevent_net_broadcast(kobj, env, action_string,
16dff336b33d8 (Eric Dumazet 2017-09-19 16:27:03 -0700 594) devpath);
7b60a18da393e (Andrew Vagin 2012-03-07 14:49:56 +0400 595) mutex_unlock(&uevent_sock_mutex);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 596)
86d56134f1b67 (Michael Marineau 2014-04-10 14:09:31 -0700 597) #ifdef CONFIG_UEVENT_HELPER
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 598) /* call uevent_helper, usually only enabled during early boot */
417daa1e8f893 (Eric W. Biederman 2010-05-04 17:36:48 -0700 599) if (uevent_helper[0] && !kobj_usermode_filter(kobj)) {
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 600) struct subprocess_info *info;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 601)
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 602) retval = add_uevent_var(env, "HOME=/");
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 603) if (retval)
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 604) goto exit;
e374a2bfebf35 (Greg Kroah-Hartman 2008-01-24 21:59:04 -0800 605) retval = add_uevent_var(env,
e374a2bfebf35 (Greg Kroah-Hartman 2008-01-24 21:59:04 -0800 606) "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 607) if (retval)
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 608) goto exit;
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 609) retval = init_uevent_argv(env, subsystem);
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 610) if (retval)
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 611) goto exit;
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 612)
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 613) retval = -ENOMEM;
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 614) info = call_usermodehelper_setup(env->argv[0], env->argv,
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 615) env->envp, GFP_KERNEL,
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 616) NULL, cleanup_uevent_env, env);
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 617) if (info) {
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 618) retval = call_usermodehelper_exec(info, UMH_NO_WAIT);
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 619) env = NULL; /* freed by cleanup_uevent_env */
bcccff93af359 (Vladimir Davydov 2014-04-03 14:48:21 -0700 620) }
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 621) }
86d56134f1b67 (Michael Marineau 2014-04-10 14:09:31 -0700 622) #endif
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 623)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 624) exit:
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 625) kfree(devpath);
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 626) kfree(env);
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 627) return retval;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 628) }
8a82472f86bf6 (Cornelia Huck 2006-11-20 17:07:51 +0100 629) EXPORT_SYMBOL_GPL(kobject_uevent_env);
8a82472f86bf6 (Cornelia Huck 2006-11-20 17:07:51 +0100 630)
8a82472f86bf6 (Cornelia Huck 2006-11-20 17:07:51 +0100 631) /**
f6e6e7799ebca (Xiaotian Feng 2010-08-13 18:58:10 +0800 632) * kobject_uevent - notify userspace by sending an uevent
8a82472f86bf6 (Cornelia Huck 2006-11-20 17:07:51 +0100 633) *
8a82472f86bf6 (Cornelia Huck 2006-11-20 17:07:51 +0100 634) * @kobj: struct kobject that the action is happening to
edbbf994bde89 (Julia Lawall 2016-10-01 21:46:28 +0200 635) * @action: action that is happening
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 636) *
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 637) * Returns 0 if kobject_uevent() is completed with success or the
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 638) * corresponding error when it fails.
8a82472f86bf6 (Cornelia Huck 2006-11-20 17:07:51 +0100 639) */
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 640) int kobject_uevent(struct kobject *kobj, enum kobject_action action)
8a82472f86bf6 (Cornelia Huck 2006-11-20 17:07:51 +0100 641) {
542cfce6f36e8 (Aneesh Kumar K.V 2006-12-19 13:01:27 -0800 642) return kobject_uevent_env(kobj, action, NULL);
8a82472f86bf6 (Cornelia Huck 2006-11-20 17:07:51 +0100 643) }
312c004d36ce6 (Kay Sievers 2005-11-16 09:00:00 +0100 644) EXPORT_SYMBOL_GPL(kobject_uevent);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 645)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 646) /**
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 647) * add_uevent_var - add key value string to the environment buffer
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 648) * @env: environment buffer structure
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 649) * @format: printf format for the key=value pair
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 650) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 651) * Returns 0 if environment variable was added successfully or -ENOMEM
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 652) * if no space was available.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 653) */
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 654) int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 655) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 656) va_list args;
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 657) int len;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 658)
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 659) if (env->envp_idx >= ARRAY_SIZE(env->envp)) {
5cd2b459d326a (Arjan van de Ven 2008-07-25 19:45:39 -0700 660) WARN(1, KERN_ERR "add_uevent_var: too many keys\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 661) return -ENOMEM;
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 662) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 663)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 664) va_start(args, format);
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 665) len = vsnprintf(&env->buf[env->buflen],
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 666) sizeof(env->buf) - env->buflen,
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 667) format, args);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 668) va_end(args);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 669)
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 670) if (len >= (sizeof(env->buf) - env->buflen)) {
5cd2b459d326a (Arjan van de Ven 2008-07-25 19:45:39 -0700 671) WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 672) return -ENOMEM;
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 673) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 674)
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 675) env->envp[env->envp_idx++] = &env->buf[env->buflen];
7eff2e7a8b65c (Kay Sievers 2007-08-14 15:15:12 +0200 676) env->buflen += len + 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 677) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 678) }
312c004d36ce6 (Kay Sievers 2005-11-16 09:00:00 +0100 679) EXPORT_SYMBOL_GPL(add_uevent_var);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 680)
4d17ffda331ba (Kay Sievers 2006-04-25 15:37:26 +0200 681) #if defined(CONFIG_NET)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 682) static int uevent_net_broadcast(struct sock *usk, struct sk_buff *skb,
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 683) struct netlink_ext_ack *extack)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 684) {
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 685) /* u64 to chars: 2^64 - 1 = 21 chars */
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 686) char buf[sizeof("SEQNUM=") + 21];
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 687) struct sk_buff *skbc;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 688) int ret;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 689)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 690) /* bump and prepare sequence number */
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 691) ret = snprintf(buf, sizeof(buf), "SEQNUM=%llu", ++uevent_seqnum);
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 692) if (ret < 0 || (size_t)ret >= sizeof(buf))
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 693) return -ENOMEM;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 694) ret++;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 695)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 696) /* verify message does not overflow */
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 697) if ((skb->len + ret) > UEVENT_BUFFER_SIZE) {
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 698) NL_SET_ERR_MSG(extack, "uevent message too big");
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 699) return -EINVAL;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 700) }
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 701)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 702) /* copy skb and extend to accommodate sequence number */
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 703) skbc = skb_copy_expand(skb, 0, ret, GFP_KERNEL);
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 704) if (!skbc)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 705) return -ENOMEM;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 706)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 707) /* append sequence number */
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 708) skb_put_data(skbc, buf, ret);
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 709)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 710) /* remove msg header */
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 711) skb_pull(skbc, NLMSG_HDRLEN);
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 712)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 713) /* set portid 0 to inform userspace message comes from kernel */
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 714) NETLINK_CB(skbc).portid = 0;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 715) NETLINK_CB(skbc).dst_group = 1;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 716)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 717) ret = netlink_broadcast(usk, skbc, 0, 1, GFP_KERNEL);
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 718) /* ENOBUFS should be handled in userspace */
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 719) if (ret == -ENOBUFS || ret == -ESRCH)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 720) ret = 0;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 721)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 722) return ret;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 723) }
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 724)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 725) static int uevent_net_rcv_skb(struct sk_buff *skb, struct nlmsghdr *nlh,
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 726) struct netlink_ext_ack *extack)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 727) {
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 728) struct net *net;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 729) int ret;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 730)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 731) if (!nlmsg_data(nlh))
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 732) return -EINVAL;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 733)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 734) /*
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 735) * Verify that we are allowed to send messages to the target
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 736) * network namespace. The caller must have CAP_SYS_ADMIN in the
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 737) * owning user namespace of the target network namespace.
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 738) */
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 739) net = sock_net(NETLINK_CB(skb).sk);
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 740) if (!netlink_ns_capable(skb, net->user_ns, CAP_SYS_ADMIN)) {
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 741) NL_SET_ERR_MSG(extack, "missing CAP_SYS_ADMIN capability");
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 742) return -EPERM;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 743) }
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 744)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 745) mutex_lock(&uevent_sock_mutex);
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 746) ret = uevent_net_broadcast(net->uevent_sock->sk, skb, extack);
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 747) mutex_unlock(&uevent_sock_mutex);
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 748)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 749) return ret;
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 750) }
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 751)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 752) static void uevent_net_rcv(struct sk_buff *skb)
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 753) {
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 754) netlink_rcv_skb(skb, &uevent_net_rcv_skb);
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 755) }
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 756)
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 757) static int uevent_net_init(struct net *net)
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 758) {
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 759) struct uevent_sock *ue_sk;
a31f2d17b331d (Pablo Neira Ayuso 2012-06-29 06:15:21 +0000 760) struct netlink_kernel_cfg cfg = {
a31f2d17b331d (Pablo Neira Ayuso 2012-06-29 06:15:21 +0000 761) .groups = 1,
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 762) .input = uevent_net_rcv,
692ec06d7c92a (Christian Brauner 2018-03-19 13:17:31 +0100 763) .flags = NL_CFG_F_NONROOT_RECV
a31f2d17b331d (Pablo Neira Ayuso 2012-06-29 06:15:21 +0000 764) };
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 765)
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 766) ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL);
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 767) if (!ue_sk)
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 768) return -ENOMEM;
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 769)
9f00d9776bc5b (Pablo Neira Ayuso 2012-09-08 02:53:54 +0000 770) ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT, &cfg);
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 771) if (!ue_sk->sk) {
b3fa29ad83770 (Bo YU 2019-01-09 04:17:00 -0500 772) pr_err("kobject_uevent: unable to create netlink socket!\n");
743db2d903bc4 (Dan Carpenter 2010-05-25 11:51:10 +0200 773) kfree(ue_sk);
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 774) return -ENODEV;
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 775) }
94e5e3087a67c (Christian Brauner 2018-03-19 13:17:30 +0100 776)
94e5e3087a67c (Christian Brauner 2018-03-19 13:17:30 +0100 777) net->uevent_sock = ue_sk;
94e5e3087a67c (Christian Brauner 2018-03-19 13:17:30 +0100 778)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 779) /* Restrict uevents to initial user namespace. */
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 780) if (sock_net(ue_sk->sk)->user_ns == &init_user_ns) {
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 781) mutex_lock(&uevent_sock_mutex);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 782) list_add_tail(&ue_sk->list, &uevent_sock_list);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 783) mutex_unlock(&uevent_sock_mutex);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 784) }
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 785)
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 786) return 0;
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 787) }
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 788)
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 789) static void uevent_net_exit(struct net *net)
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 790) {
94e5e3087a67c (Christian Brauner 2018-03-19 13:17:30 +0100 791) struct uevent_sock *ue_sk = net->uevent_sock;
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 792)
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 793) if (sock_net(ue_sk->sk)->user_ns == &init_user_ns) {
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 794) mutex_lock(&uevent_sock_mutex);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 795) list_del(&ue_sk->list);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 796) mutex_unlock(&uevent_sock_mutex);
a3498436b3a0f (Christian Brauner 2018-04-29 12:44:12 +0200 797) }
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 798)
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 799) netlink_kernel_release(ue_sk->sk);
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 800) kfree(ue_sk);
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 801) }
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 802)
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 803) static struct pernet_operations uevent_net_ops = {
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 804) .init = uevent_net_init,
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 805) .exit = uevent_net_exit,
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 806) };
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 807)
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 808) static int __init kobject_uevent_init(void)
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 809) {
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 810) return register_pernet_subsys(&uevent_net_ops);
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 811) }
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 812)
07e98962fa778 (Eric W. Biederman 2010-05-04 17:36:44 -0700 813)
5f123fbd80f4f (Kay Sievers 2005-11-11 14:43:07 +0100 814) postcore_initcall(kobject_uevent_init);
4d17ffda331ba (Kay Sievers 2006-04-25 15:37:26 +0200 815) #endif
VisionFive2 Linux kernel
StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)
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