crypto: user - fix info leaks in report API

commit 9a5467bf7b6e9e02ec9c3da4e23747c05faeaac6 upstream.

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>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index a0f768c..9f73037 100644 (file)
--- 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;
 
 {
        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;
 
        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;
 
 {
        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;
 
        rblkcipher.blocksize = alg->cra_blocksize;
        rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;

diff --git a/crypto/aead.c b/crypto/aead.c
index 04add3d..479b7d1 100644 (file)
--- 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;
 
        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;
 
        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;
 
        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;
 
        raead.blocksize = alg->cra_blocksize;
        raead.maxauthsize = aead->maxauthsize;

diff --git a/crypto/ahash.c b/crypto/ahash.c
index ac93c99..7fe1752 100644 (file)
--- 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;
 
 {
        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;
 
        rhash.blocksize = alg->cra_blocksize;
        rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;

diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index 1e61d1a..04f0f38 100644 (file)
--- 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;
 
 {
        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;
 
        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 0605a2b..5b63b8d 100644 (file)
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -71,7 +71,7 @@ static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
 {
        struct crypto_report_cipher rcipher;
 
 {
        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;
 
        rcipher.blocksize = alg->cra_blocksize;
        rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;


@@ -90,8 +90,7 @@ static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
 {
        struct crypto_report_comp rcomp;
 
 {
        struct crypto_report_comp rcomp;
 

-       snprintf(rcomp.type, CRYPTO_MAX_ALG_NAME, "%s", "compression");
-
+       strncpy(rcomp.type, "compression", sizeof(rcomp.type));

        NLA_PUT(skb, CRYPTOCFGA_REPORT_COMPRESS,
                sizeof(struct crypto_report_comp), &rcomp);
 
        NLA_PUT(skb, CRYPTOCFGA_REPORT_COMPRESS,
                sizeof(struct crypto_report_comp), &rcomp);
 


@@ -104,12 +103,14 @@ nla_put_failure:
 static int crypto_report_one(struct crypto_alg *alg,
                             struct crypto_user_alg *ualg, struct sk_buff *skb)
 {
 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);
 
        ualg->cru_flags = alg->cra_flags;
        ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
 


@@ -118,8 +119,7 @@ static int crypto_report_one(struct crypto_alg *alg,
        if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
                struct crypto_report_larval rl;
 
        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));

                NLA_PUT(skb, CRYPTOCFGA_REPORT_LARVAL,
                        sizeof(struct crypto_report_larval), &rl);
 
                NLA_PUT(skb, CRYPTOCFGA_REPORT_LARVAL,
                        sizeof(struct crypto_report_larval), &rl);
 

diff --git a/crypto/pcompress.c b/crypto/pcompress.c
index 2e458e5..6f2a361 100644 (file)
--- 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;
 
 {
        struct crypto_report_comp rpcomp;
 

-       snprintf(rpcomp.type, CRYPTO_MAX_ALG_NAME, "%s", "pcomp");
-
+       strncpy(rpcomp.type, "pcomp", sizeof(rpcomp.type));

        NLA_PUT(skb, CRYPTOCFGA_REPORT_COMPRESS,
                sizeof(struct crypto_report_comp), &rpcomp);
 
        NLA_PUT(skb, CRYPTOCFGA_REPORT_COMPRESS,
                sizeof(struct crypto_report_comp), &rpcomp);
 

diff --git a/crypto/rng.c b/crypto/rng.c
index 64f864f..1966c1d 100644 (file)
--- 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;
 
 {
        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;
 
 
        rrng.seedsize = alg->cra_rng.seedsize;
 

diff --git a/crypto/shash.c b/crypto/shash.c
index 9100912..f507294 100644 (file)
--- 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);
 
        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;
 
        rhash.blocksize = alg->cra_blocksize;
        rhash.digestsize = salg->digestsize;