crypto: user - fix info leaks in report API

Three errors resulting in kernel memory disclosure:

1/ The structures used for the netlink based crypto algorithm report API
are located on the stack. As snprintf() does not fill the remainder of
the buffer with null bytes, those stack bytes will be disclosed to users
of the API. Switch to strncpy() to fix this.

2/ crypto_report_one() does not initialize all field of struct
crypto_user_alg. Fix this to fix the heap info leak.

3/ For the module name we should copy only as many bytes as
module_name() returns -- not as much as the destination buffer could
hold. But the current code does not and therefore copies random data
from behind the end of the module name, as the module name is always
shorter than CRYPTO_MAX_ALG_NAME.

Also switch to use strncpy() to copy the algorithm's name and
driver_name. They are strings, after all.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

8 files changed, 29 insertions, 30 deletions

diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index 533de9550a82..7d4a8d28277e 100644
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -388,9 +388,9 @@ static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
         struct crypto_report_blkcipher rblkcipher;
 
-        snprintf(rblkcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "ablkcipher");
-        snprintf(rblkcipher.geniv, CRYPTO_MAX_ALG_NAME, "%s",
-                 alg->cra_ablkcipher.geniv ?: "<default>");
+        strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
+        strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
+                sizeof(rblkcipher.geniv));
 
         rblkcipher.blocksize = alg->cra_blocksize;
         rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
@@ -469,9 +469,9 @@ static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
         struct crypto_report_blkcipher rblkcipher;
 
-        snprintf(rblkcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "givcipher");
-        snprintf(rblkcipher.geniv, CRYPTO_MAX_ALG_NAME, "%s",
-                 alg->cra_ablkcipher.geniv ?: "<built-in>");
+        strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));
+        strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",
+                sizeof(rblkcipher.geniv));
 
         rblkcipher.blocksize = alg->cra_blocksize;
         rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
diff --git a/crypto/aead.c b/crypto/aead.c
index 4d04e12ffde8..547491e35c63 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -117,9 +117,8 @@ static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
         struct crypto_report_aead raead;
         struct aead_alg *aead = &alg->cra_aead;
 
-        snprintf(raead.type, CRYPTO_MAX_ALG_NAME, "%s", "aead");
-        snprintf(raead.geniv, CRYPTO_MAX_ALG_NAME, "%s",
-                 aead->geniv ?: "<built-in>");
+        strncpy(raead.type, "aead", sizeof(raead.type));
+        strncpy(raead.geniv, aead->geniv ?: "<built-in>", sizeof(raead.geniv));
 
         raead.blocksize = alg->cra_blocksize;
         raead.maxauthsize = aead->maxauthsize;
@@ -203,8 +202,8 @@ static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg)
         struct crypto_report_aead raead;
         struct aead_alg *aead = &alg->cra_aead;
 
-        snprintf(raead.type, CRYPTO_MAX_ALG_NAME, "%s", "nivaead");
-        snprintf(raead.geniv, CRYPTO_MAX_ALG_NAME, "%s", aead->geniv);
+        strncpy(raead.type, "nivaead", sizeof(raead.type));
+        strncpy(raead.geniv, aead->geniv, sizeof(raead.geniv));
 
         raead.blocksize = alg->cra_blocksize;
         raead.maxauthsize = aead->maxauthsize;
diff --git a/crypto/ahash.c b/crypto/ahash.c
index 3887856c2dd6..793a27f2493e 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -404,7 +404,7 @@ static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
         struct crypto_report_hash rhash;
 
-        snprintf(rhash.type, CRYPTO_MAX_ALG_NAME, "%s", "ahash");
+        strncpy(rhash.type, "ahash", sizeof(rhash.type));
 
         rhash.blocksize = alg->cra_blocksize;
         rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index e9e7244d5ef5..a79e7e9ab86e 100644
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -499,9 +499,9 @@ static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
         struct crypto_report_blkcipher rblkcipher;
 
-        snprintf(rblkcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "blkcipher");
-        snprintf(rblkcipher.geniv, CRYPTO_MAX_ALG_NAME, "%s",
-                 alg->cra_blkcipher.geniv ?: "<default>");
+        strncpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type));
+        strncpy(rblkcipher.geniv, alg->cra_blkcipher.geniv ?: "<default>",
+                sizeof(rblkcipher.geniv));
 
         rblkcipher.blocksize = alg->cra_blocksize;
         rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index 35d700a97d79..f6d9baf77f0a 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -75,7 +75,7 @@ static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
 {
         struct crypto_report_cipher rcipher;
 
-        snprintf(rcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "cipher");
+        strncpy(rcipher.type, "cipher", sizeof(rcipher.type));
 
         rcipher.blocksize = alg->cra_blocksize;
         rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
@@ -94,8 +94,7 @@ static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
 {
         struct crypto_report_comp rcomp;
 
-        snprintf(rcomp.type, CRYPTO_MAX_ALG_NAME, "%s", "compression");
-
+        strncpy(rcomp.type, "compression", sizeof(rcomp.type));
         if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
                     sizeof(struct crypto_report_comp), &rcomp))
                 goto nla_put_failure;
@@ -108,12 +107,14 @@ nla_put_failure:
 static int crypto_report_one(struct crypto_alg *alg,
                              struct crypto_user_alg *ualg, struct sk_buff *skb)
 {
-        memcpy(&ualg->cru_name, &alg->cra_name, sizeof(ualg->cru_name));
-        memcpy(&ualg->cru_driver_name, &alg->cra_driver_name,
-               sizeof(ualg->cru_driver_name));
-        memcpy(&ualg->cru_module_name, module_name(alg->cra_module),
-               CRYPTO_MAX_ALG_NAME);
-
+        strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
+        strncpy(ualg->cru_driver_name, alg->cra_driver_name,
+                sizeof(ualg->cru_driver_name));
+        strncpy(ualg->cru_module_name, module_name(alg->cra_module),
+                sizeof(ualg->cru_module_name));
+
+        ualg->cru_type = 0;
+        ualg->cru_mask = 0;
         ualg->cru_flags = alg->cra_flags;
         ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
 
@@ -122,8 +123,7 @@ static int crypto_report_one(struct crypto_alg *alg,
         if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
                 struct crypto_report_larval rl;
 
-                snprintf(rl.type, CRYPTO_MAX_ALG_NAME, "%s", "larval");
-
+                strncpy(rl.type, "larval", sizeof(rl.type));
                 if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
                             sizeof(struct crypto_report_larval), &rl))
                         goto nla_put_failure;
diff --git a/crypto/pcompress.c b/crypto/pcompress.c
index 04e083ff5373..7140fe70c7af 100644
--- a/crypto/pcompress.c
+++ b/crypto/pcompress.c
@@ -53,8 +53,7 @@ static int crypto_pcomp_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
         struct crypto_report_comp rpcomp;
 
-        snprintf(rpcomp.type, CRYPTO_MAX_ALG_NAME, "%s", "pcomp");
-
+        strncpy(rpcomp.type, "pcomp", sizeof(rpcomp.type));
         if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
                     sizeof(struct crypto_report_comp), &rpcomp))
                 goto nla_put_failure;
diff --git a/crypto/rng.c b/crypto/rng.c
index f3b7894dec00..e0a25c2456de 100644
--- a/crypto/rng.c
+++ b/crypto/rng.c
@@ -65,7 +65,7 @@ static int crypto_rng_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
         struct crypto_report_rng rrng;
 
-        snprintf(rrng.type, CRYPTO_MAX_ALG_NAME, "%s", "rng");
+        strncpy(rrng.type, "rng", sizeof(rrng.type));
 
         rrng.seedsize = alg->cra_rng.seedsize;
 
diff --git a/crypto/shash.c b/crypto/shash.c
index f426330f1017..929058a68561 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -530,7 +530,8 @@ static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
         struct crypto_report_hash rhash;
         struct shash_alg *salg = __crypto_shash_alg(alg);
 
-        snprintf(rhash.type, CRYPTO_MAX_ALG_NAME, "%s", "shash");
+        strncpy(rhash.type, "shash", sizeof(rhash.type));
+
         rhash.blocksize = alg->cra_blocksize;
         rhash.digestsize = salg->digestsize;