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authorEric Biggers <ebiggers@google.com>2018-01-03 11:16:27 -0800
committerHerbert Xu <herbert@gondor.apana.org.au>2018-01-12 23:03:37 +1100
commit9fa68f620041be04720d0cbfb1bd3ddfc6310b24 (patch)
treea9e8f72fa25e44b80e05b6a66039fdedbe2d01d9 /include/linux/crypto.h
parenta208fa8f33031b9e0aba44c7d1b7e68eb0cbd29e (diff)
crypto: hash - prevent using keyed hashes without setting key
Currently, almost none of the keyed hash algorithms check whether a key has been set before proceeding. Some algorithms are okay with this and will effectively just use a key of all 0's or some other bogus default. However, others will severely break, as demonstrated using "hmac(sha3-512-generic)", the unkeyed use of which causes a kernel crash via a (potentially exploitable) stack buffer overflow. A while ago, this problem was solved for AF_ALG by pairing each hash transform with a 'has_key' bool. However, there are still other places in the kernel where userspace can specify an arbitrary hash algorithm by name, and the kernel uses it as unkeyed hash without checking whether it is really unkeyed. Examples of this include: - KEYCTL_DH_COMPUTE, via the KDF extension - dm-verity - dm-crypt, via the ESSIV support - dm-integrity, via the "internal hash" mode with no key given - drbd (Distributed Replicated Block Device) This bug is especially bad for KEYCTL_DH_COMPUTE as that requires no privileges to call. Fix the bug for all users by adding a flag CRYPTO_TFM_NEED_KEY to the ->crt_flags of each hash transform that indicates whether the transform still needs to be keyed or not. Then, make the hash init, import, and digest functions return -ENOKEY if the key is still needed. The new flag also replaces the 'has_key' bool which algif_hash was previously using, thereby simplifying the algif_hash implementation. Reported-by: syzbot <syzkaller@googlegroups.com> Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/linux/crypto.h')
-rw-r--r--include/linux/crypto.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index d2e33a90825b..7e6e84cf6383 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -115,6 +115,8 @@
/*
* Transform masks and values (for crt_flags).
*/
+#define CRYPTO_TFM_NEED_KEY 0x00000001
+
#define CRYPTO_TFM_REQ_MASK 0x000fff00
#define CRYPTO_TFM_RES_MASK 0xfff00000