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evm: check hash algorithm passed to init_desc()
This patch prevents memory access beyond the evm_tfm array by checking the
validity of the index (hash algorithm) passed to init_desc(). The hash
algorithm can be arbitrarily set if the security.ima xattr type is not
EVM_XATTR_HMAC.
Fixes: 5feeb61183
("evm: Allow non-SHA1 digital signatures")
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
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1 changed files with 3 additions and 0 deletions
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@ -89,6 +89,9 @@ static struct shash_desc *init_desc(char type, uint8_t hash_algo)
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tfm = &hmac_tfm;
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tfm = &hmac_tfm;
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algo = evm_hmac;
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algo = evm_hmac;
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} else {
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} else {
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if (hash_algo >= HASH_ALGO__LAST)
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return ERR_PTR(-EINVAL);
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tfm = &evm_tfm[hash_algo];
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tfm = &evm_tfm[hash_algo];
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algo = hash_algo_name[hash_algo];
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algo = hash_algo_name[hash_algo];
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}
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}
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