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IMA: remove the dependency on CRYPTO_MD5

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commit 8510505d55e194d3f6c9644c9f9d12c4f6b0395a upstream.

MD5 is a weak digest algorithm that shouldn't be used for cryptographic
operation. It hinders the efficiency of a patch set that aims to limit
the digests allowed for the extended file attribute namely security.ima.
MD5 is no longer a requirement for IMA, nor should it be used there.

The sole place where we still use the MD5 algorithm inside IMA is setting
the ima_hash algorithm to MD5, if the user supplies 'ima_hash=md5'
parameter on the command line.  With commit ab60368ab6 ("ima: Fallback
to the builtin hash algorithm"), setting "ima_hash=md5" fails gracefully
when CRYPTO_MD5 is not set:
	ima: Can not allocate md5 (reason: -2)
	ima: Allocating md5 failed, going to use default hash algorithm sha256

Remove the CRYPTO_MD5 dependency for IMA.

Signed-off-by: THOBY Simon <Simon.THOBY@viveris.fr>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
[zohar@linux.ibm.com: include commit number in patch description for
stable.]
Cc: stable@vger.kernel.org # 4.17
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
THOBY Simon 2021-08-16 08:10:59 +00:00 committed by AuxXxilium
parent 6dfbee5d38
commit 7b2e93207c
1 changed files with 0 additions and 1 deletions
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security/integrity/ima/Kconfig
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@ -6,7 +6,6 @@ config IMA
select SECURITYFS select SECURITYFS
select CRYPTO select CRYPTO
select CRYPTO_HMAC select CRYPTO_HMAC
select CRYPTO_MD5
select CRYPTO_SHA1 select CRYPTO_SHA1
select CRYPTO_HASH_INFO select CRYPTO_HASH_INFO
select TCG_TPM if HAS_IOMEM && !UML select TCG_TPM if HAS_IOMEM && !UML