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| author | THOBY Simon <Simon.THOBY@viveris.fr> | 2021-08-16 08:10:59 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-15 09:50:48 +0200 |
| commit | 34d099a330e78122eb3da35dfd6db860fa8f230f (patch) | |
| tree | a2344ac9e52460e52a3faaeef2cb3b9231fa2ce1 /security | |
| parent | 5cc1ee31353bd45e236c8679ebb561a5ee65fc5c (diff) | |
| download | linux-rt-34d099a330e78122eb3da35dfd6db860fa8f230f.tar.gz | |
IMA: remove the dependency on CRYPTO_MD5
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 ab60368ab6a4 ("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>
Diffstat (limited to 'security')
| -rw-r--r-- | security/integrity/ima/Kconfig | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig index 12e9250c1bec..9e72edb8d31a 100644 --- a/security/integrity/ima/Kconfig +++ b/security/integrity/ima/Kconfig @@ -6,7 +6,6 @@ config IMA select SECURITYFS select CRYPTO select CRYPTO_HMAC - select CRYPTO_MD5 select CRYPTO_SHA1 select CRYPTO_HASH_INFO select TCG_TPM if HAS_IOMEM && !UML |