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vold: use unified fstab format

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Change vold to use the unified fstab.  This includes both
support for sdcards, and changes to the crypto code to work
with some changes to the fs_mgr library api.

Change-Id: Id5a8aa5b699afe151db6e31aa0d76105f9c95a80
This commit is contained in:
Ken Sumrall 2013-02-13 13:00:19 -08:00
parent db5e026058
commit 56ad03cae1
2 changed files with 48 additions and 113 deletions
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39
cryptfs.c
View file

@ -67,8 +67,8 @@ static unsigned char saved_master_key[KEY_LEN_BYTES];
static char *saved_data_blkdev;
static char *saved_mount_point;
static int master_key_saved = 0;
#define FSTAB_PREFIX "/fstab."
static char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)];
extern struct fstab *fstab;
static void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags)
{
@ -126,19 +126,6 @@ static unsigned int get_blkdev_size(int fd)
return nr_sec;
}
/* Get and cache the name of the fstab file so we don't
* keep talking over the socket to the property service.
*/
static char *get_fstab_filename(void)
{
if (fstab_filename[0] == 0) {
strcpy(fstab_filename, FSTAB_PREFIX);
property_get("ro.hardware", fstab_filename + sizeof(FSTAB_PREFIX) - 1, "");
}
return fstab_filename;
}
/* key or salt can be NULL, in which case just skip writing that value. Useful to
* update the failed mount count but not change the key.
*/
@ -153,7 +140,7 @@ static int put_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *cryp
char key_loc[PROPERTY_VALUE_MAX];
struct stat statbuf;
fs_mgr_get_crypt_info(get_fstab_filename(), key_loc, 0, sizeof(key_loc));
fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc));
if (!strcmp(key_loc, KEY_IN_FOOTER)) {
fname = real_blk_name;
@ -252,7 +239,7 @@ static int get_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *cryp
char *fname;
struct stat statbuf;
fs_mgr_get_crypt_info(get_fstab_filename(), key_loc, 0, sizeof(key_loc));
fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc));
if (!strcmp(key_loc, KEY_IN_FOOTER)) {
fname = real_blk_name;
@ -777,7 +764,7 @@ int cryptfs_restart(void)
if (! (rc = wait_and_unmount(DATA_MNT_POINT)) ) {
/* If that succeeded, then mount the decrypted filesystem */
fs_mgr_do_mount(get_fstab_filename(), DATA_MNT_POINT, crypto_blkdev, 0);
fs_mgr_do_mount(fstab, DATA_MNT_POINT, crypto_blkdev, 0);
property_set("vold.decrypt", "trigger_load_persist_props");
/* Create necessary paths on /data */
@ -815,10 +802,10 @@ static int do_crypto_complete(char *mount_point)
return 1;
}
fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev));
fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev));
if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) {
fs_mgr_get_crypt_info(get_fstab_filename(), key_loc, 0, sizeof(key_loc));
fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc));
/*
* Only report this error if key_loc is a file and it exists.
@ -865,7 +852,7 @@ static int test_mount_encrypted_fs(char *passwd, char *mount_point, char *label)
return -1;
}
fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev));
fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev));
if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) {
SLOGE("Error getting crypt footer and key\n");
@ -894,7 +881,7 @@ static int test_mount_encrypted_fs(char *passwd, char *mount_point, char *label)
*/
sprintf(tmp_mount_point, "%s/tmp_mnt", mount_point);
mkdir(tmp_mount_point, 0755);
if (fs_mgr_do_mount(get_fstab_filename(), DATA_MNT_POINT, crypto_blkdev, tmp_mount_point)) {
if (fs_mgr_do_mount(fstab, DATA_MNT_POINT, crypto_blkdev, tmp_mount_point)) {
SLOGE("Error temp mounting decrypted block device\n");
delete_crypto_blk_dev(label);
crypt_ftr.failed_decrypt_count++;
@ -1025,7 +1012,7 @@ int cryptfs_verify_passwd(char *passwd)
return -1;
}
fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev));
fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev));
if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) {
SLOGE("Error getting crypt footer and key\n");
@ -1227,7 +1214,7 @@ int cryptfs_enable(char *howarg, char *passwd)
goto error_unencrypted;
}
fs_mgr_get_crypt_info(get_fstab_filename(), key_loc, 0, sizeof(key_loc));
fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc));
if (!strcmp(howarg, "wipe")) {
how = CRYPTO_ENABLE_WIPE;
@ -1238,7 +1225,7 @@ int cryptfs_enable(char *howarg, char *passwd)
goto error_unencrypted;
}
fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev));
fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev));
/* Get the size of the real block device */
fd = open(real_blkdev, O_RDONLY);
@ -1531,7 +1518,7 @@ int cryptfs_changepw(char *newpw)
return -1;
}
fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev));
fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev));
if (strlen(real_blkdev) == 0) {
SLOGE("Can't find real blkdev");
return -1;

122
main.cpp
View file

@ -23,10 +23,12 @@
#include <fcntl.h>
#include <dirent.h>
#include <fs_mgr.h>
#define LOG_TAG "Vold"
#include "cutils/log.h"
#include "cutils/properties.h"
#include "VolumeManager.h"
#include "CommandListener.h"
@ -37,6 +39,9 @@
static int process_config(VolumeManager *vm);
static void coldboot(const char *path);
#define FSTAB_PREFIX "/fstab."
struct fstab *fstab;
int main() {
VolumeManager *vm;
@ -142,111 +147,54 @@ static void coldboot(const char *path)
}
}
static int parse_mount_flags(char *mount_flags)
static int process_config(VolumeManager *vm)
{
char *save_ptr;
int flags = 0;
char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)];
char propbuf[PROPERTY_VALUE_MAX];
int i;
int ret = -1;
int flags;
if (strcasestr(mount_flags, "encryptable")) {
flags |= VOL_ENCRYPTABLE;
}
property_get("ro.hardware", propbuf, "");
snprintf(fstab_filename, sizeof(fstab_filename), FSTAB_PREFIX"%s", propbuf);
if (strcasestr(mount_flags, "nonremovable")) {
flags |= VOL_NONREMOVABLE;
}
return flags;
}
static int process_config(VolumeManager *vm) {
FILE *fp;
int n = 0;
char line[255];
if (!(fp = fopen("/etc/vold.fstab", "r"))) {
fstab = fs_mgr_read_fstab(fstab_filename);
if (!fstab) {
SLOGE("failed to open %s\n", fstab_filename);
return -1;
}
while(fgets(line, sizeof(line), fp)) {
const char *delim = " \t";
char *save_ptr;
char *type, *label, *mount_point, *mount_flags, *sysfs_path;
int flags;
n++;
line[strlen(line)-1] = '\0';
if (line[0] == '#' || line[0] == '\0')
continue;
if (!(type = strtok_r(line, delim, &save_ptr))) {
SLOGE("Error parsing type");
goto out_syntax;
}
if (!(label = strtok_r(NULL, delim, &save_ptr))) {
SLOGE("Error parsing label");
goto out_syntax;
}
if (!(mount_point = strtok_r(NULL, delim, &save_ptr))) {
SLOGE("Error parsing mount point");
goto out_syntax;
}
if (!strcmp(type, "dev_mount")) {
/* Loop through entries looking for ones that vold manages */
for (i = 0; i < fstab->num_entries; i++) {
if (fs_mgr_is_voldmanaged(&fstab->recs[i])) {
DirectVolume *dv = NULL;
char *part;
flags = 0;
if (!(part = strtok_r(NULL, delim, &save_ptr))) {
SLOGE("Error parsing partition");
goto out_syntax;
}
if (strcmp(part, "auto") && atoi(part) == 0) {
SLOGE("Partition must either be 'auto' or 1 based index instead of '%s'", part);
goto out_syntax;
dv = new DirectVolume(vm, fstab->recs[i].label,
fstab->recs[i].mount_point,
fstab->recs[i].partnum);
if (dv->addPath(fstab->recs[i].blk_device)) {
SLOGE("Failed to add devpath %s to volume %s",
fstab->recs[i].blk_device, fstab->recs[i].label);
goto out_fail;
}
if (!strcmp(part, "auto")) {
dv = new DirectVolume(vm, label, mount_point, -1);
} else {
dv = new DirectVolume(vm, label, mount_point, atoi(part));
/* Set any flags that might be set for this volume */
if (fs_mgr_is_nonremovable(&fstab->recs[i])) {
flags |= VOL_NONREMOVABLE;
}
while ((sysfs_path = strtok_r(NULL, delim, &save_ptr))) {
if (*sysfs_path != '/') {
/* If the first character is not a '/', it must be flags */
break;
}
if (dv->addPath(sysfs_path)) {
SLOGE("Failed to add devpath %s to volume %s", sysfs_path,
label);
goto out_fail;
}
if (fs_mgr_is_encryptable(&fstab->recs[i])) {
flags |= VOL_ENCRYPTABLE;
}
/* If sysfs_path is non-null at this point, then it contains
* the optional flags for this volume
*/
if (sysfs_path)
flags = parse_mount_flags(sysfs_path);
else
flags = 0;
dv->setFlags(flags);
vm->addVolume(dv);
} else if (!strcmp(type, "map_mount")) {
} else {
SLOGE("Unknown type '%s'", type);
goto out_syntax;
}
}
fclose(fp);
return 0;
ret = 0;
out_syntax:
SLOGE("Syntax error on config line %d", n);
errno = -EINVAL;
out_fail:
fclose(fp);
return -1;
return ret;
}