linux/security/integrity/evm, branch v3.2

evm: prevent racing during tfm allocation

2011-12-20T15:50:08Z

There is a small chance of racing during tfm allocation. This patch fixes it. Signed-off-by: Dmitry Kasatkin Acked-by: Mimi Zohar Signed-off-by: James Morris

evm: key must be set once during initialization

2011-12-20T15:45:45Z

On multi-core systems, setting of the key before every caclculation, causes invalid HMAC calculation for other tfm users, because internal state (ipad, opad) can be invalid before set key call returns. It needs to be set only once during initialization. Signed-off-by: Dmitry Kasatkin Acked-by: Mimi Zohar Signed-off-by: James Morris

evm: permit mode bits to be updated

2011-09-14T19:24:52Z

Before permitting 'security.evm' to be updated, 'security.evm' must exist and be valid. In the case that there are no existing EVM protected xattrs, it is safe for posix acls to update the mode bits. To differentiate between no 'security.evm' xattr and no xattrs used to calculate 'security.evm', this patch defines INTEGRITY_NOXATTR. Signed-off-by: Mimi Zohar

evm: posix acls modify i_mode

2011-09-14T19:24:51Z

The posix xattr acls are 'system' prefixed, which normally would not affect security.evm. An interesting side affect of writing posix xattr acls is their modifying of the i_mode, which is included in security.evm. This patch updates security.evm when posix xattr acls are written. Signed-off-by: Mimi Zohar

evm: limit verifying current security.evm integrity

2011-09-14T19:24:51Z

evm_protect_xattr unnecessarily validates the current security.evm integrity, before updating non-evm protected extended attributes and other file metadata. This patch limits validating the current security.evm integrity to evm protected metadata. Signed-off-by: Mimi Zohar

evm: remove TCG_TPM dependency

2011-09-14T19:24:49Z

All tristates selected by EVM(boolean) are forced to be builtin, except in the TCG_TPM(tristate) dependency case. Arnaud Lacombe summarizes the Kconfig bug as, "So it would seem direct dependency state influence the state of reverse dependencies.." For a detailed explanation, refer to Arnaud Lacombe's posting http://lkml.org/lkml/2011/8/23/498. With the "encrypted-keys: remove trusted-keys dependency" patch, EVM can now be built without a dependency on TCG_TPM. The trusted-keys dependency requires trusted-keys to either be builtin or not selected. This dependency will prevent the boolean/tristate mismatch from occuring. Reported-by: Stephen Rothwell , Randy Dunlap Signed-off-by: Mimi Zohar

evm: add Kconfig TCG_TPM dependency

2011-08-18T02:58:12Z

Although the EVM encrypted-key should be encrypted/decrypted using a trusted-key, a user-defined key could be used instead. When using a user- defined key, a TCG_TPM dependency should not be required. Unfortunately, the encrypted-key code needs to be refactored a bit in order to remove this dependency. This patch adds the TCG_TPM dependency. Reported-by: Stephen Rothwell , Randy Dunlap Signed-off-by: Mimi Zohar Signed-off-by: James Morris

evm: fix evm_inode_init_security return code

2011-08-11T07:42:41Z

evm_inode_init_security() should return 0, when EVM is not enabled. (Returning an error is a remnant of evm_inode_post_init_security.) Signed-off-by: Mimi Zohar Signed-off-by: James Morris

EVM: ensure trusted and encypted key symbols are available to EVM

2011-08-09T01:33:36Z

Select trusted and encrypted keys if EVM is selected, to ensure the requisite symbols are available. Otherwise, these can be selected as modules while EVM is static, leading to a kernel build failure. Signed-off-by: James Morris

evm: add evm_inode_setattr to prevent updating an invalid security.evm

2011-07-18T16:29:50Z

Permit changing of security.evm only when valid, unless in fixmode. Reported-by: Roberto Sassu Signed-off-by: Mimi Zohar