[PATCH 4.9 07/12] dm crypt: make printing of the key constant-time

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

From: Mikulas Patocka <mpatocka@redhat.com>

commit 567dd8f34560fa221a6343729474536aa7ede4fd upstream.

The device mapper dm-crypt target is using scnprintf("%02x", cc->key[i]) to
report the current key to userspace. However, this is not a constant-time
operation and it may leak information about the key via timing, via cache
access patterns or via the branch predictor.

Change dm-crypt's key printing to use "%c" instead of "%02x". Also
introduce hex2asc() that carefully avoids any branching or memory
accesses when converting a number in the range 0 ... 15 to an ascii
character.

Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Tested-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/md/dm-crypt.c |   15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1943,6 +1943,11 @@ static int crypt_map(struct dm_target *t
 	return DM_MAPIO_SUBMITTED;
 }
 
+static char hex2asc(unsigned char c)
+{
+	return c + '0' + ((unsigned)(9 - c) >> 4 & 0x27);
+}
+
 static void crypt_status(struct dm_target *ti, status_type_t type,
 			 unsigned status_flags, char *result, unsigned maxlen)
 {
@@ -1958,10 +1963,12 @@ static void crypt_status(struct dm_targe
 	case STATUSTYPE_TABLE:
 		DMEMIT("%s ", cc->cipher_string);
 
-		if (cc->key_size > 0)
-			for (i = 0; i < cc->key_size; i++)
-				DMEMIT("%02x", cc->key[i]);
-		else
+		if (cc->key_size > 0) {
+			for (i = 0; i < cc->key_size; i++) {
+				DMEMIT("%c%c", hex2asc(cc->key[i] >> 4),
+				       hex2asc(cc->key[i] & 0xf));
+			}
+		} else
 			DMEMIT("-");
 
 		DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,