eCryptfs: Allocate up to two scatterlists for crypto ops on keys

I have received some reports of out-of-memory errors on some older AMD
architectures.  These errors are what I would expect to see if
crypt_stat->key were split between two separate pages.  eCryptfs should
not assume that any of the memory sent through virt_to_scatterlist() is
all contained in a single page, and so this patch allocates two
scatterlist structs instead of one when processing keys.  I have received
confirmation from one person affected by this bug that this patch resolves
the issue for him, and so I am submitting it for inclusion in a future
stable release.

Note that virt_to_scatterlist() runs sg_init_table() on the scatterlist
structs passed to it, so the calls to sg_init_table() in
decrypt_passphrase_encrypted_session_key() are redundant.

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Reported-by: Paulo J. S. Silva <pjssilva@ime.usp.br>
Cc: "Leon Woestenberg" <leon.woestenberg@gmail.com>
Cc: Tim Gardner <tim.gardner@canonical.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 14 insertions, 17 deletions

diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index e22bc3961345..0d713b691941 100644
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -1037,17 +1037,14 @@ static int
 decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
                                          struct ecryptfs_crypt_stat *crypt_stat)
 {
-        struct scatterlist dst_sg;
-        struct scatterlist src_sg;
+        struct scatterlist dst_sg[2];
+        struct scatterlist src_sg[2];
         struct mutex *tfm_mutex;
         struct blkcipher_desc desc = {
                 .flags = CRYPTO_TFM_REQ_MAY_SLEEP
         };
         int rc = 0;
 
-        sg_init_table(&dst_sg, 1);
-        sg_init_table(&src_sg, 1);
-
         if (unlikely(ecryptfs_verbosity > 0)) {
                 ecryptfs_printk(
                         KERN_DEBUG, "Session key encryption key (size [%d]):\n",
@@ -1066,8 +1063,8 @@ decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
         }
         rc = virt_to_scatterlist(auth_tok->session_key.encrypted_key,
                                  auth_tok->session_key.encrypted_key_size,
-                                 &src_sg, 1);
-        if (rc != 1) {
+                                 src_sg, 2);
+        if (rc < 1 || rc > 2) {
                 printk(KERN_ERR "Internal error whilst attempting to convert "
                         "auth_tok->session_key.encrypted_key to scatterlist; "
                         "expected rc = 1; got rc = [%d]. "
@@ -1079,8 +1076,8 @@ decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
                 auth_tok->session_key.encrypted_key_size;
         rc = virt_to_scatterlist(auth_tok->session_key.decrypted_key,
                                  auth_tok->session_key.decrypted_key_size,
-                                 &dst_sg, 1);
-        if (rc != 1) {
+                                 dst_sg, 2);
+        if (rc < 1 || rc > 2) {
                 printk(KERN_ERR "Internal error whilst attempting to convert "
                         "auth_tok->session_key.decrypted_key to scatterlist; "
                         "expected rc = 1; got rc = [%d]\n", rc);
@@ -1096,7 +1093,7 @@ decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
                 rc = -EINVAL;
                 goto out;
         }
-        rc = crypto_blkcipher_decrypt(&desc, &dst_sg, &src_sg,
+        rc = crypto_blkcipher_decrypt(&desc, dst_sg, src_sg,
                                       auth_tok->session_key.encrypted_key_size);
         mutex_unlock(tfm_mutex);
         if (unlikely(rc)) {
@@ -1539,8 +1536,8 @@ write_tag_3_packet(char *dest, size_t *remaining_bytes,
         size_t i;
         size_t encrypted_session_key_valid = 0;
         char session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES];
-        struct scatterlist dst_sg;
-        struct scatterlist src_sg;
+        struct scatterlist dst_sg[2];
+        struct scatterlist src_sg[2];
         struct mutex *tfm_mutex = NULL;
         u8 cipher_code;
         size_t packet_size_length;
@@ -1619,8 +1616,8 @@ write_tag_3_packet(char *dest, size_t *remaining_bytes,
                 ecryptfs_dump_hex(session_key_encryption_key, 16);
         }
         rc = virt_to_scatterlist(crypt_stat->key, key_rec->enc_key_size,
-                                 &src_sg, 1);
-        if (rc != 1) {
+                                 src_sg, 2);
+        if (rc < 1 || rc > 2) {
                 ecryptfs_printk(KERN_ERR, "Error generating scatterlist "
                                 "for crypt_stat session key; expected rc = 1; "
                                 "got rc = [%d]. key_rec->enc_key_size = [%d]\n",
@@ -1629,8 +1626,8 @@ write_tag_3_packet(char *dest, size_t *remaining_bytes,
                 goto out;
         }
         rc = virt_to_scatterlist(key_rec->enc_key, key_rec->enc_key_size,
-                                 &dst_sg, 1);
-        if (rc != 1) {
+                                 dst_sg, 2);
+        if (rc < 1 || rc > 2) {
                 ecryptfs_printk(KERN_ERR, "Error generating scatterlist "
                                 "for crypt_stat encrypted session key; "
                                 "expected rc = 1; got rc = [%d]. "
@@ -1651,7 +1648,7 @@ write_tag_3_packet(char *dest, size_t *remaining_bytes,
         rc = 0;
         ecryptfs_printk(KERN_DEBUG, "Encrypting [%d] bytes of the key\n",
                         crypt_stat->key_size);
-        rc = crypto_blkcipher_encrypt(&desc, &dst_sg, &src_sg,
+        rc = crypto_blkcipher_encrypt(&desc, dst_sg, src_sg,
                                       (*key_rec).enc_key_size);
         mutex_unlock(tfm_mutex);
         if (rc) {