diff options
| -rw-r--r-- | util-linux/mkswap.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/util-linux/mkswap.c b/util-linux/mkswap.c index c4e30fd92..5d1f6f05d 100644 --- a/util-linux/mkswap.c +++ b/util-linux/mkswap.c @@ -53,10 +53,6 @@ static void mkswap_selinux_setcontext(int fd, const char *path) #if ENABLE_DESKTOP static void mkswap_generate_uuid(uint8_t *buf) { - pid_t pid; - unsigned i; - char uuid_string[32]; - /* http://www.ietf.org/rfc/rfc4122.txt * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ @@ -64,7 +60,7 @@ static void mkswap_generate_uuid(uint8_t *buf) * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | time_mid | time_hi_and_version | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * |clk_seq__and_variant | node (0-1) | + * |clk_seq_and_variant | node (0-1) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | node (2-5) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ @@ -73,11 +69,11 @@ static void mkswap_generate_uuid(uint8_t *buf) * uint16_t time_mid (big endian) * uint16_t time_hi_and_version (big endian) * version is a 4-bit field: - * 1 Time-based version - * 2 DCE Security version, with embedded POSIX UIDs - * 3 Name-based version (MD5) - * 4 Randomly generated version - * 5 Name-based version (SHA-1) + * 1 Time-based + * 2 DCE Security, with embedded POSIX UIDs + * 3 Name-based (MD5) + * 4 Randomly generated + * 5 Name-based (SHA-1) * uint16_t clk_seq_and_variant (big endian) * variant is a 3-bit field: * 0xx Reserved, NCS backward compatibility @@ -90,6 +86,9 @@ static void mkswap_generate_uuid(uint8_t *buf) * time_hi_and_version & 0x0fff | 0x4000 * clk_seq_and_variant & 0x3fff | 0x8000 */ + pid_t pid; + int i; + char uuid_string[32]; i = open("/dev/urandom", O_RDONLY); if (i >= 0) { @@ -110,8 +109,10 @@ static void mkswap_generate_uuid(uint8_t *buf) pid = 0; } - buf[4 + 2 ] = (buf[4 + 2 ] & 0x0f) | 0x40; /* time_hi_and_version */ - buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80; /* clk_seq_and_variant */ + /* version = 4 */ + buf[4 + 2 ] = (buf[4 + 2 ] & 0x0f) | 0x40; + /* variant = 10x */ + buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80; bin2hex(uuid_string, (void*) buf, 16); /* f.e. UUID=dfd9c173-be52-4d27-99a5-c34c6c2ff55f */ |