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evm: check hash algorithm passed to init_desc()
commit221be106d7
upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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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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algo = evm_hmac;
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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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algo = hash_algo_name[hash_algo];
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}
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