From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: David Howells <dhowells@redhat.com>,
Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>,
keyrings@vger.kernel.org, linux-crypto@vger.kernel.org,
linux-kernel@vger.kernel.org,
Ilil Blum Shem-Tov <ilil.blum.shem-tov@intel.com>
Subject: [PATCH] crypto: asym_tpm: correct zero out potential secrets
Date: Fri, 4 Dec 2020 09:01:36 +0100 [thread overview]
Message-ID: <X8ns4AfwjKudpyfe@kroah.com> (raw)
The function derive_pub_key() should be calling memzero_explicit()
instead of memset() in case the complier decides to optimize away the
call to memset() because it "knows" no one is going to touch the memory
anymore.
Reported-by: Ilil Blum Shem-Tov <ilil.blum.shem-tov@intel.com>
Tested-by: Ilil Blum Shem-Tov <ilil.blum.shem-tov@intel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
crypto/asymmetric_keys/asym_tpm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/crypto/asymmetric_keys/asym_tpm.c b/crypto/asymmetric_keys/asym_tpm.c
index 378b18b9bc34..84a5d6af9609 100644
--- a/crypto/asymmetric_keys/asym_tpm.c
+++ b/crypto/asymmetric_keys/asym_tpm.c
@@ -354,7 +354,7 @@ static uint32_t derive_pub_key(const void *pub_key, uint32_t len, uint8_t *buf)
memcpy(cur, e, sizeof(e));
cur += sizeof(e);
/* Zero parameters to satisfy set_pub_key ABI. */
- memset(cur, 0, SETKEY_PARAMS_SIZE);
+ memzero_explicit(cur, SETKEY_PARAMS_SIZE);
return cur - buf;
}
--
2.29.2
reply other threads:[~2020-12-04 8:01 UTC|newest]
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