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Diffstat (limited to 'Documentation/ABI/testing/evm')
| -rw-r--r-- | Documentation/ABI/testing/evm | 23 |
1 files changed, 0 insertions, 23 deletions
diff --git a/Documentation/ABI/testing/evm b/Documentation/ABI/testing/evm deleted file mode 100644 index 8374d45..0000000 --- a/Documentation/ABI/testing/evm +++ /dev/null @@ -1,23 +0,0 @@ -What: security/evm -Date: March 2011 -Contact: Mimi Zohar <zohar@us.ibm.com> -Description: - EVM protects a file's security extended attributes(xattrs) - against integrity attacks. The initial method maintains an - HMAC-sha1 value across the extended attributes, storing the - value as the extended attribute 'security.evm'. - - EVM depends on the Kernel Key Retention System to provide it - with a trusted/encrypted key for the HMAC-sha1 operation. - The key is loaded onto the root's keyring using keyctl. Until - EVM receives notification that the key has been successfully - loaded onto the keyring (echo 1 > <securityfs>/evm), EVM - can not create or validate the 'security.evm' xattr, but - returns INTEGRITY_UNKNOWN. Loading the key and signaling EVM - should be done as early as possible. Normally this is done - in the initramfs, which has already been measured as part - of the trusted boot. For more information on creating and - loading existing trusted/encrypted keys, refer to: - Documentation/keys-trusted-encrypted.txt. (A sample dracut - patch, which loads the trusted/encrypted key and enables - EVM, is available from http://linux-ima.sourceforge.net/#EVM.) |