[ 3.5.y.z extended stable ] Patch "crypto: user - fix info leaks in report API" has been added to staging queue
Luis Henriques
luis.henriques at canonical.com
Wed Mar 13 13:07:52 UTC 2013
This is a note to let you know that I have just added a patch titled
crypto: user - fix info leaks in report API
to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree
which can be found at:
http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From 227b5d46162004a239a278fcf86d8034314f74e1 Mon Sep 17 00:00:00 2001
From: Mathias Krause <minipli at googlemail.com>
Date: Tue, 5 Feb 2013 18:19:13 +0100
Subject: [PATCH] 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 at googlemail.com>
Cc: Steffen Klassert <steffen.klassert at secunet.com>
Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
crypto/ablkcipher.c | 12 ++++++------
crypto/aead.c | 9 ++++-----
crypto/ahash.c | 2 +-
crypto/blkcipher.c | 6 +++---
crypto/crypto_user.c | 22 +++++++++++-----------
crypto/pcompress.c | 3 +--
crypto/rng.c | 2 +-
crypto/shash.c | 3 ++-
8 files changed, 29 insertions(+), 30 deletions(-)
diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index 533de95..7d4a8d2 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 0b8121e..27bc487 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 3887856..793a27f 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 a8d85a1..c44e014 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 5a37ead..ee69458 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 04e083f..7140fe7 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 f3b7894..e0a25c2 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 32067f4..18e4b00 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;
--
1.8.1.2
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