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crypto: sanity check that LUKS header strings are NUL-terminated
The LUKS spec requires that header strings are NUL-terminated, and our code relies on that. Protect against maliciously crafted headers by adding validation. Reviewed-by: Richard W.M. Jones <rjones@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
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@ -554,6 +554,24 @@ qcrypto_block_luks_check_header(const QCryptoBlockLUKS *luks, Error **errp)
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return -1;
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}
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if (!memchr(luks->header.cipher_name, '\0',
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sizeof(luks->header.cipher_name))) {
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error_setg(errp, "LUKS header cipher name is not NUL terminated");
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return -1;
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}
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if (!memchr(luks->header.cipher_mode, '\0',
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sizeof(luks->header.cipher_mode))) {
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error_setg(errp, "LUKS header cipher mode is not NUL terminated");
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return -1;
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}
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if (!memchr(luks->header.hash_spec, '\0',
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sizeof(luks->header.hash_spec))) {
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error_setg(errp, "LUKS header hash spec is not NUL terminated");
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return -1;
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}
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/* Check all keyslots for corruption */
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for (i = 0 ; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS ; i++) {
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