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-rw-r--r--init/devices.c235
1 files changed, 126 insertions, 109 deletions
diff --git a/init/devices.c b/init/devices.c
index 3b4d369..69f5fc8 100644
--- a/init/devices.c
+++ b/init/devices.c
@@ -30,10 +30,9 @@
#include <sys/un.h>
#include <linux/netlink.h>
-#ifdef HAVE_SELINUX
#include <selinux/selinux.h>
#include <selinux/label.h>
-#endif
+#include <selinux/android.h>
#include <private/android_filesystem_config.h>
#include <sys/time.h>
@@ -50,10 +49,9 @@
#define SYSFS_PREFIX "/sys"
#define FIRMWARE_DIR1 "/etc/firmware"
#define FIRMWARE_DIR2 "/vendor/firmware"
+#define FIRMWARE_DIR3 "/firmware/image"
-#ifdef HAVE_SELINUX
-static struct selabel_handle *sehandle;
-#endif
+extern struct selabel_handle *sehandle;
static int device_fd = -1;
@@ -63,6 +61,7 @@ struct uevent {
const char *subsystem;
const char *firmware;
const char *partition_name;
+ const char *device_name;
int partition_num;
int major;
int minor;
@@ -84,7 +83,8 @@ struct perm_node {
struct platform_node {
char *name;
- int name_len;
+ char *path;
+ int path_len;
struct listnode list;
};
@@ -127,6 +127,7 @@ void fixup_sys_perms(const char *upath)
char buf[512];
struct listnode *node;
struct perms_ *dp;
+ char *secontext;
/* upaths omit the "/sys" that paths in this list
* contain, so we add 4 when comparing...
@@ -148,6 +149,14 @@ void fixup_sys_perms(const char *upath)
INFO("fixup %s %d %d 0%o\n", buf, dp->uid, dp->gid, dp->perm);
chown(buf, dp->uid, dp->gid);
chmod(buf, dp->perm);
+ if (sehandle) {
+ secontext = NULL;
+ selabel_lookup(sehandle, &secontext, buf, 0);
+ if (secontext) {
+ setfilecon(buf, secontext);
+ freecon(secontext);
+ }
+ }
}
}
@@ -190,17 +199,15 @@ static void make_device(const char *path,
unsigned gid;
mode_t mode;
dev_t dev;
-#ifdef HAVE_SELINUX
char *secontext = NULL;
-#endif
mode = get_device_perm(path, &uid, &gid) | (block ? S_IFBLK : S_IFCHR);
-#ifdef HAVE_SELINUX
+
if (sehandle) {
selabel_lookup(sehandle, &secontext, path, mode);
setfscreatecon(secontext);
}
-#endif
+
dev = makedev(major, minor);
/* Temporarily change egid to avoid race condition setting the gid of the
* device node. Unforunately changing the euid would prevent creation of
@@ -211,95 +218,76 @@ static void make_device(const char *path,
mknod(path, mode, dev);
chown(path, uid, -1);
setegid(AID_ROOT);
-#ifdef HAVE_SELINUX
- if (secontext) {
- freecon(secontext);
- setfscreatecon(NULL);
- }
-#endif
-}
-
-
-static int make_dir(const char *path, mode_t mode)
-{
- int rc;
-
-#ifdef HAVE_SELINUX
- char *secontext = NULL;
-
- if (sehandle) {
- selabel_lookup(sehandle, &secontext, path, mode);
- setfscreatecon(secontext);
- }
-#endif
-
- rc = mkdir(path, mode);
-#ifdef HAVE_SELINUX
if (secontext) {
freecon(secontext);
setfscreatecon(NULL);
}
-#endif
- return rc;
}
-
-static void add_platform_device(const char *name)
+static void add_platform_device(const char *path)
{
- int name_len = strlen(name);
+ int path_len = strlen(path);
struct listnode *node;
struct platform_node *bus;
+ const char *name = path;
+
+ if (!strncmp(path, "/devices/", 9)) {
+ name += 9;
+ if (!strncmp(name, "platform/", 9))
+ name += 9;
+ }
list_for_each_reverse(node, &platform_names) {
bus = node_to_item(node, struct platform_node, list);
- if ((bus->name_len < name_len) &&
- (name[bus->name_len] == '/') &&
- !strncmp(name, bus->name, bus->name_len))
+ if ((bus->path_len < path_len) &&
+ (path[bus->path_len] == '/') &&
+ !strncmp(path, bus->path, bus->path_len))
/* subdevice of an existing platform, ignore it */
return;
}
- INFO("adding platform device %s\n", name);
+ INFO("adding platform device %s (%s)\n", name, path);
bus = calloc(1, sizeof(struct platform_node));
- bus->name = strdup(name);
- bus->name_len = name_len;
+ bus->path = strdup(path);
+ bus->path_len = path_len;
+ bus->name = bus->path + (name - path);
list_add_tail(&platform_names, &bus->list);
}
/*
- * given a name that may start with a platform device, find the length of the
+ * given a path that may start with a platform device, find the length of the
* platform device prefix. If it doesn't start with a platform device, return
* 0.
*/
-static const char *find_platform_device(const char *name)
+static struct platform_node *find_platform_device(const char *path)
{
- int name_len = strlen(name);
+ int path_len = strlen(path);
struct listnode *node;
struct platform_node *bus;
list_for_each_reverse(node, &platform_names) {
bus = node_to_item(node, struct platform_node, list);
- if ((bus->name_len < name_len) &&
- (name[bus->name_len] == '/') &&
- !strncmp(name, bus->name, bus->name_len))
- return bus->name;
+ if ((bus->path_len < path_len) &&
+ (path[bus->path_len] == '/') &&
+ !strncmp(path, bus->path, bus->path_len))
+ return bus;
}
return NULL;
}
-static void remove_platform_device(const char *name)
+static void remove_platform_device(const char *path)
{
struct listnode *node;
struct platform_node *bus;
list_for_each_reverse(node, &platform_names) {
bus = node_to_item(node, struct platform_node, list);
- if (!strcmp(name, bus->name)) {
- INFO("removing platform device %s\n", name);
- free(bus->name);
+ if (!strcmp(path, bus->path)) {
+ INFO("removing platform device %s\n", bus->name);
+ free(bus->path);
list_remove(node);
free(bus);
return;
@@ -335,6 +323,7 @@ static void parse_event(const char *msg, struct uevent *uevent)
uevent->minor = -1;
uevent->partition_name = NULL;
uevent->partition_num = -1;
+ uevent->device_name = NULL;
/* currently ignoring SEQNUM */
while(*msg) {
@@ -362,9 +351,12 @@ static void parse_event(const char *msg, struct uevent *uevent)
} else if(!strncmp(msg, "PARTNAME=", 9)) {
msg += 9;
uevent->partition_name = msg;
+ } else if(!strncmp(msg, "DEVNAME=", 8)) {
+ msg += 8;
+ uevent->device_name = msg;
}
- /* advance to after the next \0 */
+ /* advance to after the next \0 */
while(*msg++)
;
}
@@ -381,8 +373,10 @@ static char **get_character_device_symlinks(struct uevent *uevent)
char **links;
int link_num = 0;
int width;
+ struct platform_node *pdev;
- if (strncmp(uevent->path, "/devices/platform/", 18))
+ pdev = find_platform_device(uevent->path);
+ if (!pdev)
return NULL;
links = malloc(sizeof(char *) * 2);
@@ -391,7 +385,7 @@ static char **get_character_device_symlinks(struct uevent *uevent)
memset(links, 0, sizeof(char *) * 2);
/* skip "/devices/platform/<driver>" */
- parent = strchr(uevent->path + 18, '/');
+ parent = strchr(uevent->path + pdev->path_len, '/');
if (!*parent)
goto err;
@@ -428,7 +422,7 @@ err:
static char **parse_platform_block_device(struct uevent *uevent)
{
const char *device;
- const char *path;
+ struct platform_node *pdev;
char *slash;
int width;
char buf[256];
@@ -440,18 +434,16 @@ static char **parse_platform_block_device(struct uevent *uevent)
unsigned int size;
struct stat info;
+ pdev = find_platform_device(uevent->path);
+ if (!pdev)
+ return NULL;
+ device = pdev->name;
+
char **links = malloc(sizeof(char *) * 4);
if (!links)
return NULL;
memset(links, 0, sizeof(char *) * 4);
- /* Drop "/devices/platform/" */
- path = uevent->path;
- device = path + 18;
- device = find_platform_device(device);
- if (!device)
- goto err;
-
INFO("found platform device %s\n", device);
snprintf(link_path, sizeof(link_path), "/dev/block/platform/%s", device);
@@ -473,17 +465,13 @@ static char **parse_platform_block_device(struct uevent *uevent)
links[link_num] = NULL;
}
- slash = strrchr(path, '/');
+ slash = strrchr(uevent->path, '/');
if (asprintf(&links[link_num], "%s/%s", link_path, slash + 1) > 0)
link_num++;
else
links[link_num] = NULL;
return links;
-
-err:
- free(links);
- return NULL;
}
static void handle_device(const char *action, const char *devpath,
@@ -516,12 +504,12 @@ static void handle_device(const char *action, const char *devpath,
static void handle_platform_device_event(struct uevent *uevent)
{
- const char *name = uevent->path + 18; /* length of /devices/platform/ */
+ const char *path = uevent->path;
if (!strcmp(uevent->action, "add"))
- add_platform_device(name);
+ add_platform_device(path);
else if (!strcmp(uevent->action, "remove"))
- remove_platform_device(name);
+ remove_platform_device(path);
}
static const char *parse_device_name(struct uevent *uevent, unsigned int len)
@@ -559,7 +547,7 @@ static void handle_block_device_event(struct uevent *uevent)
snprintf(devpath, sizeof(devpath), "%s%s", base, name);
make_dir(base, 0755);
- if (!strncmp(uevent->path, "/devices/platform/", 18))
+ if (!strncmp(uevent->path, "/devices/", 9))
links = parse_platform_block_device(uevent);
handle_device(uevent->action, devpath, uevent->path, 1,
@@ -579,18 +567,39 @@ static void handle_generic_device_event(struct uevent *uevent)
if (!strncmp(uevent->subsystem, "usb", 3)) {
if (!strcmp(uevent->subsystem, "usb")) {
- /* 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);
+ if (uevent->device_name) {
+ /*
+ * create device node provided by kernel if present
+ * see drivers/base/core.c
+ */
+ char *p = devpath;
+ snprintf(devpath, sizeof(devpath), "/dev/%s", uevent->device_name);
+ /* skip leading /dev/ */
+ p += 5;
+ /* build directories */
+ while (*p) {
+ if (*p == '/') {
+ *p = 0;
+ make_dir(devpath, 0755);
+ *p = '/';
+ }
+ p++;
+ }
+ }
+ 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;
@@ -598,6 +607,9 @@ static void handle_generic_device_event(struct uevent *uevent)
} 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);
@@ -634,7 +646,7 @@ static void handle_generic_device_event(struct uevent *uevent)
static void handle_device_event(struct uevent *uevent)
{
- if (!strcmp(uevent->action,"add"))
+ if (!strcmp(uevent->action,"add") || !strcmp(uevent->action, "change"))
fixup_sys_perms(uevent->path);
if (!strncmp(uevent->subsystem, "block", 5)) {
@@ -699,7 +711,7 @@ static int is_booting(void)
static void process_firmware_event(struct uevent *uevent)
{
- char *root, *loading, *data, *file1 = NULL, *file2 = NULL;
+ char *root, *loading, *data, *file1 = NULL, *file2 = NULL, *file3 = NULL;
int l, loading_fd, data_fd, fw_fd;
int booting = is_booting();
@@ -726,6 +738,10 @@ static void process_firmware_event(struct uevent *uevent)
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);
if(loading_fd < 0)
goto file_free_out;
@@ -739,17 +755,20 @@ try_loading_again:
if(fw_fd < 0) {
fw_fd = open(file2, O_RDONLY);
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;
+ fw_fd = open(file3, O_RDONLY);
+ 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;
}
- INFO("firmware: could not open '%s' %d\n", uevent->firmware, errno);
- write(loading_fd, "-1", 2);
- goto data_close_out;
}
}
@@ -870,16 +889,14 @@ void device_init(void)
suseconds_t t0, t1;
struct stat info;
int fd;
-#ifdef HAVE_SELINUX
- struct selinux_opt seopts[] = {
- { SELABEL_OPT_PATH, "/file_contexts" }
- };
- if (is_selinux_enabled() > 0)
- sehandle = selabel_open(SELABEL_CTX_FILE, seopts, 1);
-#endif
- /* is 64K enough? udev uses 16MB! */
- device_fd = uevent_open_socket(64*1024, true);
+ sehandle = NULL;
+ if (is_selinux_enabled() > 0) {
+ sehandle = selinux_android_file_context_handle();
+ }
+
+ /* is 256K enough? udev uses 16MB! */
+ device_fd = uevent_open_socket(256*1024, true);
if(device_fd < 0)
return;
generated by cgit v1.1 at 2025-10-26 12:56:42 +0000