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-rw-r--r--fs_mgr/fs_mgr.c255
1 files changed, 208 insertions, 47 deletions
diff --git a/fs_mgr/fs_mgr.c b/fs_mgr/fs_mgr.c
index 4f11fbb..13b71ee 100644
--- a/fs_mgr/fs_mgr.c
+++ b/fs_mgr/fs_mgr.c
@@ -27,18 +27,35 @@
#include <sys/wait.h>
#include <libgen.h>
#include <time.h>
-
+#include <sys/swap.h>
+/* XXX These need to be obtained from kernel headers. See b/9336527 */
+#define SWAP_FLAG_PREFER 0x8000
+#define SWAP_FLAG_PRIO_MASK 0x7fff
+#define SWAP_FLAG_PRIO_SHIFT 0
+#define SWAP_FLAG_DISCARD 0x10000
+
+#include <linux/loop.h>
#include <private/android_filesystem_config.h>
#include <cutils/partition_utils.h>
#include <cutils/properties.h>
#include <logwrap/logwrap.h>
+#include "mincrypt/rsa.h"
+#include "mincrypt/sha.h"
+#include "mincrypt/sha256.h"
+
#include "fs_mgr_priv.h"
+#include "fs_mgr_priv_verity.h"
#define KEY_LOC_PROP "ro.crypto.keyfile.userdata"
#define KEY_IN_FOOTER "footer"
#define E2FSCK_BIN "/system/bin/e2fsck"
+#define MKSWAP_BIN "/system/bin/mkswap"
+
+#define FSCK_LOG_FILE "/dev/fscklogs/log"
+
+#define ZRAM_CONF_DEV "/sys/block/zram0/disksize"
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(*(a)))
@@ -74,10 +91,23 @@ static struct flag_list fs_mgr_flags[] = {
{ "voldmanaged=",MF_VOLDMANAGED},
{ "length=", MF_LENGTH },
{ "recoveryonly",MF_RECOVERYONLY },
+ { "swapprio=", MF_SWAPPRIO },
+ { "zramsize=", MF_ZRAMSIZE },
+ { "verify", MF_VERIFY },
+ { "noemulatedsd", MF_NOEMULATEDSD },
{ "defaults", 0 },
{ 0, 0 },
};
+struct fs_mgr_flag_values {
+ char *key_loc;
+ long long part_length;
+ char *label;
+ int partnum;
+ int swap_prio;
+ unsigned int zram_size;
+};
+
/*
* gettime() - returns the time in seconds of the system's monotonic clock or
* zero on error.
@@ -109,7 +139,7 @@ static int wait_for_file(const char *filename, int timeout)
}
static int parse_flags(char *flags, struct flag_list *fl,
- char **key_loc, long long *part_length, char **label, int *partnum,
+ struct fs_mgr_flag_values *flag_vals,
char *fs_options, int fs_options_len)
{
int f = 0;
@@ -117,21 +147,12 @@ static int parse_flags(char *flags, struct flag_list *fl,
char *p;
char *savep;
- /* initialize key_loc to null, if we find an MF_CRYPT flag,
- * then we'll set key_loc to the proper value */
- if (key_loc) {
- *key_loc = NULL;
- }
- /* initialize part_length to 0, if we find an MF_LENGTH flag,
- * then we'll set part_length to the proper value */
- if (part_length) {
- *part_length = 0;
- }
- if (partnum) {
- *partnum = -1;
- }
- if (label) {
- *label = NULL;
+ /* initialize flag values. If we find a relevant flag, we'll
+ * update the value */
+ if (flag_vals) {
+ memset(flag_vals, 0, sizeof(*flag_vals));
+ flag_vals->partnum = -1;
+ flag_vals->swap_prio = -1; /* negative means it wasn't specified. */
}
/* initialize fs_options to the null string */
@@ -147,17 +168,17 @@ static int parse_flags(char *flags, struct flag_list *fl,
for (i = 0; fl[i].name; i++) {
if (!strncmp(p, fl[i].name, strlen(fl[i].name))) {
f |= fl[i].flag;
- if ((fl[i].flag == MF_CRYPT) && key_loc) {
+ if ((fl[i].flag == MF_CRYPT) && flag_vals) {
/* The encryptable flag is followed by an = and the
* location of the keys. Get it and return it.
*/
- *key_loc = strdup(strchr(p, '=') + 1);
- } else if ((fl[i].flag == MF_LENGTH) && part_length) {
+ flag_vals->key_loc = strdup(strchr(p, '=') + 1);
+ } else if ((fl[i].flag == MF_LENGTH) && flag_vals) {
/* The length flag is followed by an = and the
* size of the partition. Get it and return it.
*/
- *part_length = strtoll(strchr(p, '=') + 1, NULL, 0);
- } else if ((fl[i].flag == MF_VOLDMANAGED) && label && partnum) {
+ flag_vals->part_length = strtoll(strchr(p, '=') + 1, NULL, 0);
+ } else if ((fl[i].flag == MF_VOLDMANAGED) && flag_vals) {
/* The voldmanaged flag is followed by an = and the
* label, a colon and the partition number or the
* word "auto", e.g.
@@ -171,17 +192,21 @@ static int parse_flags(char *flags, struct flag_list *fl,
label_start = strchr(p, '=') + 1;
label_end = strchr(p, ':');
if (label_end) {
- *label = strndup(label_start,
- (int) (label_end - label_start));
+ flag_vals->label = strndup(label_start,
+ (int) (label_end - label_start));
part_start = strchr(p, ':') + 1;
if (!strcmp(part_start, "auto")) {
- *partnum = -1;
+ flag_vals->partnum = -1;
} else {
- *partnum = strtol(part_start, NULL, 0);
+ flag_vals->partnum = strtol(part_start, NULL, 0);
}
} else {
ERROR("Warning: voldmanaged= flag malformed\n");
}
+ } else if ((fl[i].flag == MF_SWAPPRIO) && flag_vals) {
+ flag_vals->swap_prio = strtoll(strchr(p, '=') + 1, NULL, 0);
+ } else if ((fl[i].flag == MF_ZRAMSIZE) && flag_vals) {
+ flag_vals->zram_size = strtoll(strchr(p, '=') + 1, NULL, 0);
}
break;
}
@@ -224,10 +249,7 @@ struct fstab *fs_mgr_read_fstab(const char *fstab_path)
char *save_ptr, *p;
struct fstab *fstab = NULL;
struct fstab_rec *recs;
- char *key_loc;
- long long part_length;
- char *label;
- int partnum;
+ struct fs_mgr_flag_values flag_vals;
#define FS_OPTIONS_LEN 1024
char tmp_fs_options[FS_OPTIONS_LEN];
@@ -315,8 +337,7 @@ struct fstab *fs_mgr_read_fstab(const char *fstab_path)
goto err;
}
tmp_fs_options[0] = '\0';
- fstab->recs[cnt].flags = parse_flags(p, mount_flags,
- NULL, NULL, NULL, NULL,
+ fstab->recs[cnt].flags = parse_flags(p, mount_flags, NULL,
tmp_fs_options, FS_OPTIONS_LEN);
/* fs_options are optional */
@@ -331,13 +352,13 @@ struct fstab *fs_mgr_read_fstab(const char *fstab_path)
goto err;
}
fstab->recs[cnt].fs_mgr_flags = parse_flags(p, fs_mgr_flags,
- &key_loc, &part_length,
- &label, &partnum,
- NULL, 0);
- fstab->recs[cnt].key_loc = key_loc;
- fstab->recs[cnt].length = part_length;
- fstab->recs[cnt].label = label;
- fstab->recs[cnt].partnum = partnum;
+ &flag_vals, NULL, 0);
+ fstab->recs[cnt].key_loc = flag_vals.key_loc;
+ fstab->recs[cnt].length = flag_vals.part_length;
+ fstab->recs[cnt].label = flag_vals.label;
+ fstab->recs[cnt].partnum = flag_vals.partnum;
+ fstab->recs[cnt].swap_prio = flag_vals.swap_prio;
+ fstab->recs[cnt].zram_size = flag_vals.zram_size;
cnt++;
}
fclose(fstab_file);
@@ -356,6 +377,10 @@ void fs_mgr_free_fstab(struct fstab *fstab)
{
int i;
+ if (!fstab) {
+ return;
+ }
+
for (i = 0; i < fstab->num_entries; i++) {
/* Free the pointers return by strdup(3) */
free(fstab->recs[i].blk_device);
@@ -411,7 +436,8 @@ static void check_fs(char *blk_device, char *fs_type, char *target)
INFO("Running %s on %s\n", E2FSCK_BIN, blk_device);
ret = android_fork_execvp_ext(ARRAY_SIZE(e2fsck_argv), e2fsck_argv,
- &status, true, LOG_KLOG, true);
+ &status, true, LOG_KLOG | LOG_FILE,
+ true, FSCK_LOG_FILE);
if (ret < 0) {
/* No need to check for error in fork, we can't really handle it now */
@@ -433,6 +459,43 @@ static void remove_trailing_slashes(char *n)
}
}
+/*
+ * Mark the given block device as read-only, using the BLKROSET ioctl.
+ * Return 0 on success, and -1 on error.
+ */
+static void fs_set_blk_ro(const char *blockdev)
+{
+ int fd;
+ int ON = 1;
+
+ fd = open(blockdev, O_RDONLY);
+ if (fd < 0) {
+ // should never happen
+ return;
+ }
+
+ ioctl(fd, BLKROSET, &ON);
+ close(fd);
+}
+
+/*
+ * __mount(): wrapper around the mount() system call which also
+ * sets the underlying block device to read-only if the mount is read-only.
+ * See "man 2 mount" for return values.
+ */
+static int __mount(const char *source, const char *target,
+ const char *filesystemtype, unsigned long mountflags,
+ const void *data)
+{
+ int ret = mount(source, target, filesystemtype, mountflags, data);
+
+ if ((ret == 0) && (mountflags & MS_RDONLY) != 0) {
+ fs_set_blk_ro(source);
+ }
+
+ return ret;
+}
+
static int fs_match(char *in1, char *in2)
{
char *n1;
@@ -470,8 +533,9 @@ int fs_mgr_mount_all(struct fstab *fstab)
continue;
}
- /* Skip raw partition entries such as boot, recovery, etc */
- if (!strcmp(fstab->recs[i].fs_type, "emmc") ||
+ /* Skip swap and raw partition entries such as boot, recovery, etc */
+ if (!strcmp(fstab->recs[i].fs_type, "swap") ||
+ !strcmp(fstab->recs[i].fs_type, "emmc") ||
!strcmp(fstab->recs[i].fs_type, "mtd")) {
continue;
}
@@ -485,9 +549,17 @@ int fs_mgr_mount_all(struct fstab *fstab)
fstab->recs[i].mount_point);
}
- mret = mount(fstab->recs[i].blk_device, fstab->recs[i].mount_point,
+ if (fstab->recs[i].fs_mgr_flags & MF_VERIFY) {
+ if (fs_mgr_setup_verity(&fstab->recs[i]) < 0) {
+ ERROR("Could not set up verified partition, skipping!");
+ continue;
+ }
+ }
+
+ mret = __mount(fstab->recs[i].blk_device, fstab->recs[i].mount_point,
fstab->recs[i].fs_type, fstab->recs[i].flags,
fstab->recs[i].fs_options);
+
if (!mret) {
/* Success! Go get the next one */
continue;
@@ -543,8 +615,9 @@ int fs_mgr_do_mount(struct fstab *fstab, char *n_name, char *n_blk_device,
}
/* We found our match */
- /* If this is a raw partition, report an error */
- if (!strcmp(fstab->recs[i].fs_type, "emmc") ||
+ /* If this swap or a raw partition, report an error */
+ if (!strcmp(fstab->recs[i].fs_type, "swap") ||
+ !strcmp(fstab->recs[i].fs_type, "emmc") ||
!strcmp(fstab->recs[i].fs_type, "mtd")) {
ERROR("Cannot mount filesystem of type %s on %s\n",
fstab->recs[i].fs_type, n_blk_device);
@@ -561,14 +634,21 @@ int fs_mgr_do_mount(struct fstab *fstab, char *n_name, char *n_blk_device,
fstab->recs[i].mount_point);
}
+ if (fstab->recs[i].fs_mgr_flags & MF_VERIFY) {
+ if (fs_mgr_setup_verity(&fstab->recs[i]) < 0) {
+ ERROR("Could not set up verified partition, skipping!");
+ continue;
+ }
+ }
+
/* Now mount it where requested */
if (tmp_mount_point) {
m = tmp_mount_point;
} else {
m = fstab->recs[i].mount_point;
}
- if (mount(n_blk_device, m, fstab->recs[i].fs_type,
- fstab->recs[i].flags, fstab->recs[i].fs_options)) {
+ if (__mount(n_blk_device, m, fstab->recs[i].fs_type,
+ fstab->recs[i].flags, fstab->recs[i].fs_options)) {
ERROR("Cannot mount filesystem on %s at %s\n",
n_blk_device, m);
goto out;
@@ -623,6 +703,83 @@ int fs_mgr_unmount_all(struct fstab *fstab)
return ret;
}
+
+/* This must be called after mount_all, because the mkswap command needs to be
+ * available.
+ */
+int fs_mgr_swapon_all(struct fstab *fstab)
+{
+ int i = 0;
+ int flags = 0;
+ int err = 0;
+ int ret = 0;
+ int status;
+ char *mkswap_argv[2] = {
+ MKSWAP_BIN,
+ NULL
+ };
+
+ if (!fstab) {
+ return -1;
+ }
+
+ for (i = 0; i < fstab->num_entries; i++) {
+ /* Skip non-swap entries */
+ if (strcmp(fstab->recs[i].fs_type, "swap")) {
+ continue;
+ }
+
+ if (fstab->recs[i].zram_size > 0) {
+ /* A zram_size was specified, so we need to configure the
+ * device. There is no point in having multiple zram devices
+ * on a system (all the memory comes from the same pool) so
+ * we can assume the device number is 0.
+ */
+ FILE *zram_fp;
+
+ zram_fp = fopen(ZRAM_CONF_DEV, "r+");
+ if (zram_fp == NULL) {
+ ERROR("Unable to open zram conf device " ZRAM_CONF_DEV);
+ ret = -1;
+ continue;
+ }
+ fprintf(zram_fp, "%d\n", fstab->recs[i].zram_size);
+ fclose(zram_fp);
+ }
+
+ if (fstab->recs[i].fs_mgr_flags & MF_WAIT) {
+ wait_for_file(fstab->recs[i].blk_device, WAIT_TIMEOUT);
+ }
+
+ /* Initialize the swap area */
+ mkswap_argv[1] = fstab->recs[i].blk_device;
+ err = android_fork_execvp_ext(ARRAY_SIZE(mkswap_argv), mkswap_argv,
+ &status, true, LOG_KLOG, false, NULL);
+ if (err) {
+ ERROR("mkswap failed for %s\n", fstab->recs[i].blk_device);
+ ret = -1;
+ continue;
+ }
+
+ /* If -1, then no priority was specified in fstab, so don't set
+ * SWAP_FLAG_PREFER or encode the priority */
+ if (fstab->recs[i].swap_prio >= 0) {
+ flags = (fstab->recs[i].swap_prio << SWAP_FLAG_PRIO_SHIFT) &
+ SWAP_FLAG_PRIO_MASK;
+ flags |= SWAP_FLAG_PREFER;
+ } else {
+ flags = 0;
+ }
+ err = swapon(fstab->recs[i].blk_device, flags);
+ if (err) {
+ ERROR("swapon failed for %s\n", fstab->recs[i].blk_device);
+ ret = -1;
+ }
+ }
+
+ return ret;
+}
+
/*
* key_loc must be at least PROPERTY_VALUE_MAX bytes long
*
@@ -729,3 +886,7 @@ int fs_mgr_is_encryptable(struct fstab_rec *fstab)
return fstab->fs_mgr_flags & MF_CRYPT;
}
+int fs_mgr_is_noemulatedsd(struct fstab_rec *fstab)
+{
+ return fstab->fs_mgr_flags & MF_NOEMULATEDSD;
+}
generated by cgit v1.1 at 2025-08-15 18:31:49 +0000