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vold: cryptfs: Retry encryption after killing processes using /data

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Currently, if a non-framework process or service is using /data,
unmounting will fail as nothing will kill it.
Instead of rebooting on unmount failure, we now kill all processes
using /data, then try one more time.

Bug: 11291208
Change-Id: I6c5276c78aa55965914ace96e1db74dc80fca3c1
This commit is contained in:
JP Abgrall 2013-11-01 13:06:20 -07:00
parent 0291262a68
commit 502dc74153
3 changed files with 18 additions and 8 deletions
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7
CommandListener.cpp
View file

@ -549,7 +549,12 @@ int CommandListener::CryptfsCmd::runCommand(SocketClient *cli,
return 0;
}
dumpArgs(argc, argv, 3);
rc = cryptfs_enable(argv[2], argv[3]);
rc = cryptfs_enable(argv[2], argv[3], /*allow_reboot*/false);
if (rc) {
Process::killProcessesWithOpenFiles(DATA_MNT_POINT, 2);
rc = cryptfs_enable(argv[2], argv[3], true);
}
} else if (!strcmp(argv[1], "changepw")) {
if (argc != 3) {
cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs changepw <newpasswd>", false);

15
cryptfs.c
View file

@ -51,7 +51,6 @@
#include "crypto_scrypt.h"
#define DM_CRYPT_BUF_SIZE 4096
#define DATA_MNT_POINT "/data"
#define HASH_COUNT 2000
#define KEY_LEN_BYTES 16
@ -1576,7 +1575,7 @@ static inline int should_encrypt(struct volume_info *volume)
(VOL_ENCRYPTABLE | VOL_NONREMOVABLE);
}
int cryptfs_enable(char *howarg, char *passwd)
int cryptfs_enable(char *howarg, char *passwd, int allow_reboot)
{
int how = 0;
char crypto_blkdev[MAXPATHLEN], real_blkdev[MAXPATHLEN], sd_crypto_blkdev[MAXPATHLEN];
@ -1597,7 +1596,7 @@ int cryptfs_enable(char *howarg, char *passwd)
off64_t cur_encryption_done=0, tot_encryption_size=0;
property_get("ro.crypto.state", encrypted_state, "");
if (strcmp(encrypted_state, "unencrypted")) {
if (!strcmp(encrypted_state, "encrypted")) {
SLOGE("Device is already running encrypted, aborting");
goto error_unencrypted;
}
@ -1703,7 +1702,11 @@ int cryptfs_enable(char *howarg, char *passwd)
/* Now unmount the /data partition. */
if (wait_and_unmount(DATA_MNT_POINT)) {
goto error_shutting_down;
if (allow_reboot) {
goto error_shutting_down;
} else {
goto error_unencrypted;
}
}
/* Do extra work for a better UX when doing the long inplace encryption */
@ -1757,7 +1760,7 @@ int cryptfs_enable(char *howarg, char *passwd)
/* Make an encrypted master key */
if (create_encrypted_random_key(passwd, crypt_ftr.master_key, crypt_ftr.salt, &crypt_ftr)) {
SLOGE("Cannot create encrypted master key\n");
goto error_unencrypted;
goto error_shutting_down;
}
/* Write the key to the end of the partition */
@ -1829,7 +1832,7 @@ int cryptfs_enable(char *howarg, char *passwd)
} else {
/* Shouldn't happen */
SLOGE("cryptfs_enable: internal error, unknown option\n");
goto error_unencrypted;
goto error_shutting_down;
}
/* Undo the dm-crypt mapping whether we succeed or not */

4
cryptfs.h
View file

@ -132,6 +132,8 @@ struct volume_info {
#define VOL_PRIMARY 0x4
#define VOL_PROVIDES_ASEC 0x8
#define DATA_MNT_POINT "/data"
#ifdef __cplusplus
extern "C" {
#endif
@ -142,7 +144,7 @@ extern "C" {
int cryptfs_check_passwd(char *pw);
int cryptfs_verify_passwd(char *newpw);
int cryptfs_restart(void);
int cryptfs_enable(char *flag, char *passwd);
int cryptfs_enable(char *flag, char *passwd, int allow_reboot);
int cryptfs_changepw(char *newpw);
int cryptfs_setup_volume(const char *label, int major, int minor,
char *crypto_dev_path, unsigned int max_pathlen,