linux/security/integrity/evm, branch v4.9

xattr: Add __vfs_{get,set,remove}xattr helpers

2016-10-08T00:10:44Z

Right now, various places in the kernel check for the existence of getxattr, setxattr, and removexattr inode operations and directly call those operations. Switch to helper functions and test for the IOP_XATTR flag instead. Signed-off-by: Andreas Gruenbacher Acked-by: James Morris Signed-off-by: Al Viro

evm: Translate user/group ids relative to s_user_ns when computing HMAC

2016-07-05T20:13:10Z

The EVM HMAC should be calculated using the on disk user and group ids, so the k[ug]ids in the inode must be translated relative to the s_user_ns of the inode's super block. Signed-off-by: Seth Forshee Signed-off-by: Eric W. Biederman

->getxattr(): pass dentry and inode as separate arguments

2016-04-11T04:48:00Z

Signed-off-by: Al Viro

don't bother with ->d_inode->i_sb - it's always equal to ->d_sb

2016-04-10T21:11:51Z

... and neither can ever be NULL Signed-off-by: Al Viro

EVM: Use crypto_memneq() for digest comparisons

2016-02-12T07:36:47Z

This patch fixes vulnerability CVE-2016-2085. The problem exists because the vm_verify_hmac() function includes a use of memcmp(). Unfortunately, this allows timing side channel attacks; specifically a MAC forgery complexity drop from 2^128 to 2^12. This patch changes the memcmp() to the cryptographically safe crypto_memneq(). Reported-by: Xiaofei Rex Guo Signed-off-by: Ryan Ware Cc: stable@vger.kernel.org Signed-off-by: Mimi Zohar Signed-off-by: James Morris

evm: EVM_LOAD_X509 depends on EVM

2015-12-15T14:57:21Z

The newly added EVM_LOAD_X509 code can be configured even if CONFIG_EVM is disabled, but that causes a link error: security/built-in.o: In function `integrity_load_keys': digsig_asymmetric.c:(.init.text+0x400): undefined reference to `evm_load_x509' This adds a Kconfig dependency to ensure it is only enabled when CONFIG_EVM is set as well. Signed-off-by: Arnd Bergmann Fixes: 2ce523eb8976 ("evm: load x509 certificate from the kernel") Signed-off-by: Mimi Zohar

evm: reset EVM status when file attributes change

2015-12-15T14:56:57Z

The EVM verification status is cached in iint->evm_status and if it was successful, never re-verified again when IMA passes the 'iint' to evm_verifyxattr(). When file attributes or extended attributes change, we may wish to re-verify EVM integrity as well. For example, after setting a digital signature we may need to re-verify the signature and update the iint->flags that there is an EVM signature. This patch enables that by resetting evm_status to INTEGRITY_UKNOWN state. Changes in v2: * Flag setting moved to EVM layer Signed-off-by: Dmitry Kasatkin Signed-off-by: Mimi Zohar

evm: provide a function to set the EVM key from the kernel

2015-12-15T13:53:36Z

A crypto HW kernel module can possibly initialize the EVM key from the kernel __init code to enable EVM before calling the 'init' process. This patch provides a function evm_set_key() to set the EVM key directly without using the KEY subsystem. Changes in v4: * kernel-doc style for evm_set_key Changes in v3: * error reporting moved to evm_set_key * EVM_INIT_HMAC moved to evm_set_key * added bitop to prevent key setting race Changes in v2: * use size_t for key size instead of signed int * provide EVM_MAX_KEY_SIZE macro in * provide EVM_MIN_KEY_SIZE macro in Signed-off-by: Dmitry Kasatkin Signed-off-by: Mimi Zohar

evm: enable EVM when X509 certificate is loaded

2015-12-15T13:50:48Z

In order to enable EVM before starting the 'init' process, evm_initialized needs to be non-zero. Previously non-zero indicated that the HMAC key was loaded. When EVM loads the X509 before calling 'init', with this patch it is now possible to enable EVM to start signature based verification. This patch defines bits to enable EVM if a key of any type is loaded. Changes in v3: * print error message if key is not set Changes in v2: * EVM_STATE_KEY_SET replaced by EVM_INIT_HMAC * EVM_STATE_X509_SET replaced by EVM_INIT_X509 Signed-off-by: Dmitry Kasatkin Signed-off-by: Mimi Zohar

evm: load an x509 certificate from the kernel

2015-12-15T13:31:19Z

This patch defines a configuration option and the evm_load_x509() hook to load an X509 certificate onto the EVM trusted kernel keyring. Changes in v4: * Patch description updated Changes in v3: * Removed EVM_X509_PATH definition. CONFIG_EVM_X509_PATH is used directly. Changes in v2: * default key patch changed to /etc/keys Signed-off-by: Dmitry Kasatkin Signed-off-by: Mimi Zohar