1061 lines
28 KiB
C
1061 lines
28 KiB
C
/*
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* Copyright (C) 2007-2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <fnmatch.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <linux/netlink.h>
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#include <selinux/selinux.h>
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#include <selinux/label.h>
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#include <selinux/android.h>
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#include <selinux/avc.h>
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#include <private/android_filesystem_config.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <cutils/list.h>
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#include <cutils/uevent.h>
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#include "devices.h"
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#include "ueventd_parser.h"
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#include "util.h"
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#include "log.h"
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#define UNUSED __attribute__((__unused__))
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#define SYSFS_PREFIX "/sys"
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#define FIRMWARE_DIR1 "/etc/firmware"
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#define FIRMWARE_DIR2 "/vendor/firmware"
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#define FIRMWARE_DIR3 "/firmware/image"
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extern struct selabel_handle *sehandle;
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static int device_fd = -1;
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struct uevent {
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const char *action;
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const char *path;
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const char *subsystem;
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const char *firmware;
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const char *partition_name;
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const char *device_name;
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int partition_num;
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int major;
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int minor;
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};
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struct perms_ {
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char *name;
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char *attr;
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mode_t perm;
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unsigned int uid;
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unsigned int gid;
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unsigned short prefix;
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unsigned short wildcard;
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};
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struct perm_node {
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struct perms_ dp;
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struct listnode plist;
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};
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struct platform_node {
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char *name;
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char *path;
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int path_len;
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struct listnode list;
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};
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static list_declare(sys_perms);
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static list_declare(dev_perms);
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static list_declare(platform_names);
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int add_dev_perms(const char *name, const char *attr,
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mode_t perm, unsigned int uid, unsigned int gid,
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unsigned short prefix,
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unsigned short wildcard) {
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struct perm_node *node = calloc(1, sizeof(*node));
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if (!node)
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return -ENOMEM;
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node->dp.name = strdup(name);
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if (!node->dp.name)
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return -ENOMEM;
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if (attr) {
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node->dp.attr = strdup(attr);
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if (!node->dp.attr)
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return -ENOMEM;
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}
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node->dp.perm = perm;
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node->dp.uid = uid;
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node->dp.gid = gid;
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node->dp.prefix = prefix;
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node->dp.wildcard = wildcard;
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if (attr)
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list_add_tail(&sys_perms, &node->plist);
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else
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list_add_tail(&dev_perms, &node->plist);
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return 0;
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}
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void fixup_sys_perms(const char *upath)
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{
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char buf[512];
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struct listnode *node;
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struct perms_ *dp;
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/* upaths omit the "/sys" that paths in this list
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* contain, so we add 4 when comparing...
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*/
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list_for_each(node, &sys_perms) {
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dp = &(node_to_item(node, struct perm_node, plist))->dp;
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if (dp->prefix) {
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if (strncmp(upath, dp->name + 4, strlen(dp->name + 4)))
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continue;
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} else if (dp->wildcard) {
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if (fnmatch(dp->name + 4, upath, FNM_PATHNAME) != 0)
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continue;
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} else {
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if (strcmp(upath, dp->name + 4))
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continue;
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}
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if ((strlen(upath) + strlen(dp->attr) + 6) > sizeof(buf))
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break;
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sprintf(buf,"/sys%s/%s", upath, dp->attr);
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INFO("fixup %s %d %d 0%o\n", buf, dp->uid, dp->gid, dp->perm);
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chown(buf, dp->uid, dp->gid);
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chmod(buf, dp->perm);
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}
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// Now fixup SELinux file labels
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int len = snprintf(buf, sizeof(buf), "/sys%s", upath);
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if ((len < 0) || ((size_t) len >= sizeof(buf))) {
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// Overflow
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return;
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}
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if (access(buf, F_OK) == 0) {
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INFO("restorecon_recursive: %s\n", buf);
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restorecon_recursive(buf);
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}
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}
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static bool perm_path_matches(const char *path, struct perms_ *dp)
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{
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if (dp->prefix) {
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if (strncmp(path, dp->name, strlen(dp->name)) == 0)
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return true;
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} else if (dp->wildcard) {
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if (fnmatch(dp->name, path, FNM_PATHNAME) == 0)
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return true;
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} else {
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if (strcmp(path, dp->name) == 0)
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return true;
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}
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return false;
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}
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static mode_t get_device_perm(const char *path, const char **links,
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unsigned *uid, unsigned *gid)
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{
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struct listnode *node;
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struct perm_node *perm_node;
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struct perms_ *dp;
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/* search the perms list in reverse so that ueventd.$hardware can
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* override ueventd.rc
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*/
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list_for_each_reverse(node, &dev_perms) {
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bool match = false;
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perm_node = node_to_item(node, struct perm_node, plist);
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dp = &perm_node->dp;
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if (perm_path_matches(path, dp)) {
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match = true;
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} else {
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if (links) {
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int i;
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for (i = 0; links[i]; i++) {
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if (perm_path_matches(links[i], dp)) {
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match = true;
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break;
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}
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}
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}
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}
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if (match) {
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*uid = dp->uid;
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*gid = dp->gid;
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return dp->perm;
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}
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}
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/* Default if nothing found. */
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*uid = 0;
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*gid = 0;
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return 0600;
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}
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static void make_device(const char *path,
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const char *upath UNUSED,
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int block, int major, int minor,
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const char **links)
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{
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unsigned uid;
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unsigned gid;
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mode_t mode;
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dev_t dev;
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char *secontext = NULL;
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mode = get_device_perm(path, links, &uid, &gid) | (block ? S_IFBLK : S_IFCHR);
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if (sehandle) {
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selabel_lookup_best_match(sehandle, &secontext, path, links, mode);
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setfscreatecon(secontext);
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}
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dev = makedev(major, minor);
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/* Temporarily change egid to avoid race condition setting the gid of the
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* device node. Unforunately changing the euid would prevent creation of
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* some device nodes, so the uid has to be set with chown() and is still
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* racy. Fixing the gid race at least fixed the issue with system_server
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* opening dynamic input devices under the AID_INPUT gid. */
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setegid(gid);
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mknod(path, mode, dev);
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chown(path, uid, -1);
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setegid(AID_ROOT);
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if (secontext) {
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freecon(secontext);
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setfscreatecon(NULL);
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}
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}
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static void add_platform_device(const char *path)
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{
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int path_len = strlen(path);
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struct listnode *node;
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struct platform_node *bus;
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const char *name = path;
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if (!strncmp(path, "/devices/", 9)) {
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name += 9;
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if (!strncmp(name, "platform/", 9))
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name += 9;
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}
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list_for_each_reverse(node, &platform_names) {
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bus = node_to_item(node, struct platform_node, list);
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if ((bus->path_len < path_len) &&
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(path[bus->path_len] == '/') &&
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!strncmp(path, bus->path, bus->path_len))
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/* subdevice of an existing platform, ignore it */
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return;
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}
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INFO("adding platform device %s (%s)\n", name, path);
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bus = calloc(1, sizeof(struct platform_node));
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bus->path = strdup(path);
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bus->path_len = path_len;
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bus->name = bus->path + (name - path);
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list_add_tail(&platform_names, &bus->list);
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}
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/*
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* given a path that may start with a platform device, find the length of the
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* platform device prefix. If it doesn't start with a platform device, return
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* 0.
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*/
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static struct platform_node *find_platform_device(const char *path)
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{
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int path_len = strlen(path);
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struct listnode *node;
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struct platform_node *bus;
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list_for_each_reverse(node, &platform_names) {
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bus = node_to_item(node, struct platform_node, list);
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if ((bus->path_len < path_len) &&
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(path[bus->path_len] == '/') &&
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!strncmp(path, bus->path, bus->path_len))
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return bus;
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}
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return NULL;
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}
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static void remove_platform_device(const char *path)
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{
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struct listnode *node;
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struct platform_node *bus;
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list_for_each_reverse(node, &platform_names) {
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bus = node_to_item(node, struct platform_node, list);
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if (!strcmp(path, bus->path)) {
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INFO("removing platform device %s\n", bus->name);
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free(bus->path);
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list_remove(node);
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free(bus);
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return;
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}
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}
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}
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/* Given a path that may start with a PCI device, populate the supplied buffer
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* with the PCI domain/bus number and the peripheral ID and return 0.
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* If it doesn't start with a PCI device, or there is some error, return -1 */
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static int find_pci_device_prefix(const char *path, char *buf, ssize_t buf_sz)
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{
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const char *start, *end;
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if (strncmp(path, "/devices/pci", 12))
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return -1;
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/* Beginning of the prefix is the initial "pci" after "/devices/" */
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start = path + 9;
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/* End of the prefix is two path '/' later, capturing the domain/bus number
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* and the peripheral ID. Example: pci0000:00/0000:00:1f.2 */
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end = strchr(start, '/');
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if (!end)
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return -1;
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end = strchr(end + 1, '/');
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if (!end)
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return -1;
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/* Make sure we have enough room for the string plus null terminator */
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if (end - start + 1 > buf_sz)
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return -1;
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strncpy(buf, start, end - start);
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buf[end - start] = '\0';
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return 0;
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}
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#if LOG_UEVENTS
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static inline suseconds_t get_usecs(void)
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{
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struct timeval tv;
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gettimeofday(&tv, 0);
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return tv.tv_sec * (suseconds_t) 1000000 + tv.tv_usec;
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}
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#define log_event_print(x...) INFO(x)
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#else
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#define log_event_print(fmt, args...) do { } while (0)
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#define get_usecs() 0
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#endif
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static void parse_event(const char *msg, struct uevent *uevent)
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{
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uevent->action = "";
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uevent->path = "";
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uevent->subsystem = "";
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uevent->firmware = "";
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uevent->major = -1;
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uevent->minor = -1;
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uevent->partition_name = NULL;
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uevent->partition_num = -1;
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uevent->device_name = NULL;
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/* currently ignoring SEQNUM */
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while(*msg) {
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if(!strncmp(msg, "ACTION=", 7)) {
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msg += 7;
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uevent->action = msg;
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} else if(!strncmp(msg, "DEVPATH=", 8)) {
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msg += 8;
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uevent->path = msg;
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} else if(!strncmp(msg, "SUBSYSTEM=", 10)) {
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msg += 10;
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uevent->subsystem = msg;
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} else if(!strncmp(msg, "FIRMWARE=", 9)) {
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msg += 9;
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uevent->firmware = msg;
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} else if(!strncmp(msg, "MAJOR=", 6)) {
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msg += 6;
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uevent->major = atoi(msg);
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} else if(!strncmp(msg, "MINOR=", 6)) {
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msg += 6;
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uevent->minor = atoi(msg);
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} else if(!strncmp(msg, "PARTN=", 6)) {
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msg += 6;
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uevent->partition_num = atoi(msg);
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} else if(!strncmp(msg, "PARTNAME=", 9)) {
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msg += 9;
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uevent->partition_name = msg;
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} else if(!strncmp(msg, "DEVNAME=", 8)) {
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msg += 8;
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uevent->device_name = msg;
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}
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/* advance to after the next \0 */
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while(*msg++)
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;
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}
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log_event_print("event { '%s', '%s', '%s', '%s', %d, %d }\n",
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uevent->action, uevent->path, uevent->subsystem,
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uevent->firmware, uevent->major, uevent->minor);
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}
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static char **get_character_device_symlinks(struct uevent *uevent)
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{
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const char *parent;
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char *slash;
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char **links;
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int link_num = 0;
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int width;
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struct platform_node *pdev;
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pdev = find_platform_device(uevent->path);
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if (!pdev)
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return NULL;
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links = malloc(sizeof(char *) * 2);
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if (!links)
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return NULL;
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memset(links, 0, sizeof(char *) * 2);
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/* skip "/devices/platform/<driver>" */
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parent = strchr(uevent->path + pdev->path_len, '/');
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if (!parent)
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goto err;
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if (!strncmp(parent, "/usb", 4)) {
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/* skip root hub name and device. use device interface */
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while (*++parent && *parent != '/');
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if (*parent)
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while (*++parent && *parent != '/');
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if (!*parent)
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goto err;
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slash = strchr(++parent, '/');
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if (!slash)
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goto err;
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width = slash - parent;
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if (width <= 0)
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goto err;
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if (asprintf(&links[link_num], "/dev/usb/%s%.*s", uevent->subsystem, width, parent) > 0)
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link_num++;
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else
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links[link_num] = NULL;
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mkdir("/dev/usb", 0755);
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}
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else {
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goto err;
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}
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return links;
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err:
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free(links);
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return NULL;
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}
|
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|
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static char **get_block_device_symlinks(struct uevent *uevent)
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{
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const char *device;
|
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struct platform_node *pdev;
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char *slash;
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const char *type;
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char buf[256];
|
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char link_path[256];
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int link_num = 0;
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char *p;
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pdev = find_platform_device(uevent->path);
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if (pdev) {
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device = pdev->name;
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type = "platform";
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} else if (!find_pci_device_prefix(uevent->path, buf, sizeof(buf))) {
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device = buf;
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type = "pci";
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} else {
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return NULL;
|
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}
|
|
|
|
char **links = malloc(sizeof(char *) * 4);
|
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if (!links)
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return NULL;
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memset(links, 0, sizeof(char *) * 4);
|
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|
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INFO("found %s device %s\n", type, device);
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snprintf(link_path, sizeof(link_path), "/dev/block/%s/%s", type, device);
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|
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if (uevent->partition_name) {
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p = strdup(uevent->partition_name);
|
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sanitize(p);
|
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if (strcmp(uevent->partition_name, p))
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NOTICE("Linking partition '%s' as '%s'\n", uevent->partition_name, p);
|
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if (asprintf(&links[link_num], "%s/by-name/%s", link_path, p) > 0)
|
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link_num++;
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else
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links[link_num] = NULL;
|
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free(p);
|
|
}
|
|
|
|
if (uevent->partition_num >= 0) {
|
|
if (asprintf(&links[link_num], "%s/by-num/p%d", link_path, uevent->partition_num) > 0)
|
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link_num++;
|
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else
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links[link_num] = NULL;
|
|
}
|
|
|
|
slash = strrchr(uevent->path, '/');
|
|
if (asprintf(&links[link_num], "%s/%s", link_path, slash + 1) > 0)
|
|
link_num++;
|
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else
|
|
links[link_num] = NULL;
|
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|
|
return links;
|
|
}
|
|
|
|
static void handle_device(const char *action, const char *devpath,
|
|
const char *path, int block, int major, int minor, char **links)
|
|
{
|
|
int i;
|
|
|
|
if(!strcmp(action, "add")) {
|
|
make_device(devpath, path, block, major, minor, (const char **)links);
|
|
if (links) {
|
|
for (i = 0; links[i]; i++)
|
|
make_link(devpath, links[i]);
|
|
}
|
|
}
|
|
|
|
if(!strcmp(action, "remove")) {
|
|
if (links) {
|
|
for (i = 0; links[i]; i++)
|
|
remove_link(devpath, links[i]);
|
|
}
|
|
unlink(devpath);
|
|
}
|
|
|
|
if (links) {
|
|
for (i = 0; links[i]; i++)
|
|
free(links[i]);
|
|
free(links);
|
|
}
|
|
}
|
|
|
|
static void handle_platform_device_event(struct uevent *uevent)
|
|
{
|
|
const char *path = uevent->path;
|
|
|
|
if (!strcmp(uevent->action, "add"))
|
|
add_platform_device(path);
|
|
else if (!strcmp(uevent->action, "remove"))
|
|
remove_platform_device(path);
|
|
}
|
|
|
|
static const char *parse_device_name(struct uevent *uevent, unsigned int len)
|
|
{
|
|
const char *name;
|
|
|
|
/* if it's not a /dev device, nothing else to do */
|
|
if((uevent->major < 0) || (uevent->minor < 0))
|
|
return NULL;
|
|
|
|
/* do we have a name? */
|
|
name = strrchr(uevent->path, '/');
|
|
if(!name)
|
|
return NULL;
|
|
name++;
|
|
|
|
/* too-long names would overrun our buffer */
|
|
if(strlen(name) > len) {
|
|
ERROR("DEVPATH=%s exceeds %u-character limit on filename; ignoring event\n",
|
|
name, len);
|
|
return NULL;
|
|
}
|
|
|
|
return name;
|
|
}
|
|
|
|
static void handle_block_device_event(struct uevent *uevent)
|
|
{
|
|
const char *base = "/dev/block/";
|
|
const char *name;
|
|
char devpath[96];
|
|
char **links = NULL;
|
|
|
|
name = parse_device_name(uevent, 64);
|
|
if (!name)
|
|
return;
|
|
|
|
snprintf(devpath, sizeof(devpath), "%s%s", base, name);
|
|
make_dir(base, 0755);
|
|
|
|
if (!strncmp(uevent->path, "/devices/", 9))
|
|
links = get_block_device_symlinks(uevent);
|
|
|
|
handle_device(uevent->action, devpath, uevent->path, 1,
|
|
uevent->major, uevent->minor, links);
|
|
}
|
|
|
|
#define DEVPATH_LEN 96
|
|
|
|
static bool assemble_devpath(char *devpath, const char *dirname,
|
|
const char *devname)
|
|
{
|
|
int s = snprintf(devpath, DEVPATH_LEN, "%s/%s", dirname, devname);
|
|
if (s < 0) {
|
|
ERROR("failed to assemble device path (%s); ignoring event\n",
|
|
strerror(errno));
|
|
return false;
|
|
} else if (s >= DEVPATH_LEN) {
|
|
ERROR("%s/%s exceeds %u-character limit on path; ignoring event\n",
|
|
dirname, devname, DEVPATH_LEN);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static void mkdir_recursive_for_devpath(const char *devpath)
|
|
{
|
|
char dir[DEVPATH_LEN];
|
|
char *slash;
|
|
|
|
strcpy(dir, devpath);
|
|
slash = strrchr(dir, '/');
|
|
*slash = '\0';
|
|
mkdir_recursive(dir, 0755);
|
|
}
|
|
|
|
static inline void __attribute__((__deprecated__)) kernel_logger()
|
|
{
|
|
INFO("kernel logger is deprecated\n");
|
|
}
|
|
|
|
static void handle_generic_device_event(struct uevent *uevent)
|
|
{
|
|
char *base;
|
|
const char *name;
|
|
char devpath[DEVPATH_LEN] = {0};
|
|
char **links = NULL;
|
|
|
|
name = parse_device_name(uevent, 64);
|
|
if (!name)
|
|
return;
|
|
|
|
struct ueventd_subsystem *subsystem =
|
|
ueventd_subsystem_find_by_name(uevent->subsystem);
|
|
|
|
if (subsystem) {
|
|
const char *devname;
|
|
|
|
switch (subsystem->devname_src) {
|
|
case DEVNAME_UEVENT_DEVNAME:
|
|
devname = uevent->device_name;
|
|
break;
|
|
|
|
case DEVNAME_UEVENT_DEVPATH:
|
|
devname = name;
|
|
break;
|
|
|
|
default:
|
|
ERROR("%s subsystem's devpath option is not set; ignoring event\n",
|
|
uevent->subsystem);
|
|
return;
|
|
}
|
|
|
|
if (!assemble_devpath(devpath, subsystem->dirname, devname))
|
|
return;
|
|
mkdir_recursive_for_devpath(devpath);
|
|
} else if (!strncmp(uevent->subsystem, "usb", 3)) {
|
|
if (!strcmp(uevent->subsystem, "usb")) {
|
|
if (uevent->device_name) {
|
|
if (!assemble_devpath(devpath, "/dev", uevent->device_name))
|
|
return;
|
|
mkdir_recursive_for_devpath(devpath);
|
|
}
|
|
else {
|
|
/* This imitates the file system that would be created
|
|
* if we were using devfs instead.
|
|
* Minors are broken up into groups of 128, starting at "001"
|
|
*/
|
|
int bus_id = uevent->minor / 128 + 1;
|
|
int device_id = uevent->minor % 128 + 1;
|
|
/* build directories */
|
|
make_dir("/dev/bus", 0755);
|
|
make_dir("/dev/bus/usb", 0755);
|
|
snprintf(devpath, sizeof(devpath), "/dev/bus/usb/%03d", bus_id);
|
|
make_dir(devpath, 0755);
|
|
snprintf(devpath, sizeof(devpath), "/dev/bus/usb/%03d/%03d", bus_id, device_id);
|
|
}
|
|
} else {
|
|
/* ignore other USB events */
|
|
return;
|
|
}
|
|
} else if (!strncmp(uevent->subsystem, "graphics", 8)) {
|
|
base = "/dev/graphics/";
|
|
make_dir(base, 0755);
|
|
} else if (!strncmp(uevent->subsystem, "drm", 3)) {
|
|
base = "/dev/dri/";
|
|
make_dir(base, 0755);
|
|
} else if (!strncmp(uevent->subsystem, "oncrpc", 6)) {
|
|
base = "/dev/oncrpc/";
|
|
make_dir(base, 0755);
|
|
} else if (!strncmp(uevent->subsystem, "adsp", 4)) {
|
|
base = "/dev/adsp/";
|
|
make_dir(base, 0755);
|
|
} else if (!strncmp(uevent->subsystem, "msm_camera", 10)) {
|
|
base = "/dev/msm_camera/";
|
|
make_dir(base, 0755);
|
|
} else if(!strncmp(uevent->subsystem, "input", 5)) {
|
|
base = "/dev/input/";
|
|
make_dir(base, 0755);
|
|
} else if(!strncmp(uevent->subsystem, "mtd", 3)) {
|
|
base = "/dev/mtd/";
|
|
make_dir(base, 0755);
|
|
} else if(!strncmp(uevent->subsystem, "sound", 5)) {
|
|
base = "/dev/snd/";
|
|
make_dir(base, 0755);
|
|
} else if(!strncmp(uevent->subsystem, "misc", 4) &&
|
|
!strncmp(name, "log_", 4)) {
|
|
kernel_logger();
|
|
base = "/dev/log/";
|
|
make_dir(base, 0755);
|
|
name += 4;
|
|
} else
|
|
base = "/dev/";
|
|
links = get_character_device_symlinks(uevent);
|
|
|
|
if (!devpath[0])
|
|
snprintf(devpath, sizeof(devpath), "%s%s", base, name);
|
|
|
|
handle_device(uevent->action, devpath, uevent->path, 0,
|
|
uevent->major, uevent->minor, links);
|
|
}
|
|
|
|
static void handle_device_event(struct uevent *uevent)
|
|
{
|
|
if (!strcmp(uevent->action,"add") || !strcmp(uevent->action, "change") || !strcmp(uevent->action, "online"))
|
|
fixup_sys_perms(uevent->path);
|
|
|
|
if (!strncmp(uevent->subsystem, "block", 5)) {
|
|
handle_block_device_event(uevent);
|
|
} else if (!strncmp(uevent->subsystem, "platform", 8)) {
|
|
handle_platform_device_event(uevent);
|
|
} else {
|
|
handle_generic_device_event(uevent);
|
|
}
|
|
}
|
|
|
|
static int load_firmware(int fw_fd, int loading_fd, int data_fd)
|
|
{
|
|
struct stat st;
|
|
long len_to_copy;
|
|
int ret = 0;
|
|
|
|
if(fstat(fw_fd, &st) < 0)
|
|
return -1;
|
|
len_to_copy = st.st_size;
|
|
|
|
write(loading_fd, "1", 1); /* start transfer */
|
|
|
|
while (len_to_copy > 0) {
|
|
char buf[PAGE_SIZE];
|
|
ssize_t nr;
|
|
|
|
nr = read(fw_fd, buf, sizeof(buf));
|
|
if(!nr)
|
|
break;
|
|
if(nr < 0) {
|
|
ret = -1;
|
|
break;
|
|
}
|
|
|
|
len_to_copy -= nr;
|
|
while (nr > 0) {
|
|
ssize_t nw = 0;
|
|
|
|
nw = write(data_fd, buf + nw, nr);
|
|
if(nw <= 0) {
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
nr -= nw;
|
|
}
|
|
}
|
|
|
|
out:
|
|
if(!ret)
|
|
write(loading_fd, "0", 1); /* successful end of transfer */
|
|
else
|
|
write(loading_fd, "-1", 2); /* abort transfer */
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int is_booting(void)
|
|
{
|
|
return access("/dev/.booting", F_OK) == 0;
|
|
}
|
|
|
|
static void process_firmware_event(struct uevent *uevent)
|
|
{
|
|
char *root, *loading, *data, *file1 = NULL, *file2 = NULL, *file3 = NULL;
|
|
int l, loading_fd, data_fd, fw_fd;
|
|
int booting = is_booting();
|
|
|
|
INFO("firmware: loading '%s' for '%s'\n",
|
|
uevent->firmware, uevent->path);
|
|
|
|
l = asprintf(&root, SYSFS_PREFIX"%s/", uevent->path);
|
|
if (l == -1)
|
|
return;
|
|
|
|
l = asprintf(&loading, "%sloading", root);
|
|
if (l == -1)
|
|
goto root_free_out;
|
|
|
|
l = asprintf(&data, "%sdata", root);
|
|
if (l == -1)
|
|
goto loading_free_out;
|
|
|
|
l = asprintf(&file1, FIRMWARE_DIR1"/%s", uevent->firmware);
|
|
if (l == -1)
|
|
goto data_free_out;
|
|
|
|
l = asprintf(&file2, FIRMWARE_DIR2"/%s", uevent->firmware);
|
|
if (l == -1)
|
|
goto data_free_out;
|
|
|
|
l = asprintf(&file3, FIRMWARE_DIR3"/%s", uevent->firmware);
|
|
if (l == -1)
|
|
goto data_free_out;
|
|
|
|
loading_fd = open(loading, O_WRONLY|O_CLOEXEC);
|
|
if(loading_fd < 0)
|
|
goto file_free_out;
|
|
|
|
data_fd = open(data, O_WRONLY|O_CLOEXEC);
|
|
if(data_fd < 0)
|
|
goto loading_close_out;
|
|
|
|
try_loading_again:
|
|
fw_fd = open(file1, O_RDONLY|O_CLOEXEC);
|
|
if(fw_fd < 0) {
|
|
fw_fd = open(file2, O_RDONLY|O_CLOEXEC);
|
|
if (fw_fd < 0) {
|
|
fw_fd = open(file3, O_RDONLY|O_CLOEXEC);
|
|
if (fw_fd < 0) {
|
|
if (booting) {
|
|
/* If we're not fully booted, we may be missing
|
|
* filesystems needed for firmware, wait and retry.
|
|
*/
|
|
usleep(100000);
|
|
booting = is_booting();
|
|
goto try_loading_again;
|
|
}
|
|
INFO("firmware: could not open '%s' %d\n", uevent->firmware, errno);
|
|
write(loading_fd, "-1", 2);
|
|
goto data_close_out;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(!load_firmware(fw_fd, loading_fd, data_fd))
|
|
INFO("firmware: copy success { '%s', '%s' }\n", root, uevent->firmware);
|
|
else
|
|
INFO("firmware: copy failure { '%s', '%s' }\n", root, uevent->firmware);
|
|
|
|
close(fw_fd);
|
|
data_close_out:
|
|
close(data_fd);
|
|
loading_close_out:
|
|
close(loading_fd);
|
|
file_free_out:
|
|
free(file1);
|
|
free(file2);
|
|
free(file3);
|
|
data_free_out:
|
|
free(data);
|
|
loading_free_out:
|
|
free(loading);
|
|
root_free_out:
|
|
free(root);
|
|
}
|
|
|
|
static void handle_firmware_event(struct uevent *uevent)
|
|
{
|
|
pid_t pid;
|
|
|
|
if(strcmp(uevent->subsystem, "firmware"))
|
|
return;
|
|
|
|
if(strcmp(uevent->action, "add"))
|
|
return;
|
|
|
|
/* we fork, to avoid making large memory allocations in init proper */
|
|
pid = fork();
|
|
if (!pid) {
|
|
process_firmware_event(uevent);
|
|
_exit(EXIT_SUCCESS);
|
|
} else if (pid < 0) {
|
|
log_event_print("could not fork to process firmware event: %s\n", strerror(errno));
|
|
}
|
|
}
|
|
|
|
#define UEVENT_MSG_LEN 2048
|
|
void handle_device_fd()
|
|
{
|
|
char msg[UEVENT_MSG_LEN+2];
|
|
int n;
|
|
while ((n = uevent_kernel_multicast_recv(device_fd, msg, UEVENT_MSG_LEN)) > 0) {
|
|
if(n >= UEVENT_MSG_LEN) /* overflow -- discard */
|
|
continue;
|
|
|
|
msg[n] = '\0';
|
|
msg[n+1] = '\0';
|
|
|
|
struct uevent uevent;
|
|
parse_event(msg, &uevent);
|
|
|
|
if (sehandle && selinux_status_updated() > 0) {
|
|
struct selabel_handle *sehandle2;
|
|
sehandle2 = selinux_android_file_context_handle();
|
|
if (sehandle2) {
|
|
selabel_close(sehandle);
|
|
sehandle = sehandle2;
|
|
}
|
|
}
|
|
|
|
handle_device_event(&uevent);
|
|
handle_firmware_event(&uevent);
|
|
}
|
|
}
|
|
|
|
/* Coldboot walks parts of the /sys tree and pokes the uevent files
|
|
** to cause the kernel to regenerate device add events that happened
|
|
** before init's device manager was started
|
|
**
|
|
** We drain any pending events from the netlink socket every time
|
|
** we poke another uevent file to make sure we don't overrun the
|
|
** socket's buffer.
|
|
*/
|
|
|
|
static void do_coldboot(DIR *d)
|
|
{
|
|
struct dirent *de;
|
|
int dfd, fd;
|
|
|
|
dfd = dirfd(d);
|
|
|
|
fd = openat(dfd, "uevent", O_WRONLY);
|
|
if(fd >= 0) {
|
|
write(fd, "add\n", 4);
|
|
close(fd);
|
|
handle_device_fd();
|
|
}
|
|
|
|
while((de = readdir(d))) {
|
|
DIR *d2;
|
|
|
|
if(de->d_type != DT_DIR || de->d_name[0] == '.')
|
|
continue;
|
|
|
|
fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY);
|
|
if(fd < 0)
|
|
continue;
|
|
|
|
d2 = fdopendir(fd);
|
|
if(d2 == 0)
|
|
close(fd);
|
|
else {
|
|
do_coldboot(d2);
|
|
closedir(d2);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void coldboot(const char *path)
|
|
{
|
|
DIR *d = opendir(path);
|
|
if(d) {
|
|
do_coldboot(d);
|
|
closedir(d);
|
|
}
|
|
}
|
|
|
|
void device_init(void)
|
|
{
|
|
suseconds_t t0, t1;
|
|
struct stat info;
|
|
int fd;
|
|
|
|
sehandle = NULL;
|
|
if (is_selinux_enabled() > 0) {
|
|
sehandle = selinux_android_file_context_handle();
|
|
selinux_status_open(true);
|
|
}
|
|
|
|
/* is 256K enough? udev uses 16MB! */
|
|
device_fd = uevent_open_socket(256*1024, true);
|
|
if(device_fd < 0)
|
|
return;
|
|
|
|
fcntl(device_fd, F_SETFD, FD_CLOEXEC);
|
|
fcntl(device_fd, F_SETFL, O_NONBLOCK);
|
|
|
|
if (stat(COLDBOOT_DONE, &info) < 0) {
|
|
t0 = get_usecs();
|
|
coldboot("/sys/class");
|
|
coldboot("/sys/block");
|
|
coldboot("/sys/devices");
|
|
t1 = get_usecs();
|
|
fd = open(COLDBOOT_DONE, O_WRONLY|O_CREAT|O_CLOEXEC, 0000);
|
|
close(fd);
|
|
log_event_print("coldboot %ld uS\n", ((long) (t1 - t0)));
|
|
// t0 & t1 are unused if the log isn't doing anything.
|
|
(void)t0;
|
|
(void)t1;
|
|
} else {
|
|
log_event_print("skipping coldboot, already done\n");
|
|
}
|
|
}
|
|
|
|
int get_device_fd()
|
|
{
|
|
return device_fd;
|
|
}
|