diff options
| author | Matthew Garrett <mjg59@google.com> | 2017-11-07 07:17:42 -0800 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2017-12-11 17:20:39 -0500 |
| commit | 50b977481fce90aa5fbda55e330b9d722733e358 (patch) | |
| tree | f7852b45d6d4207e37cd89c397905e1a7558c527 /security/integrity/evm/evm.h | |
| parent | ae1ba1676b88e6c62368a433c7e2d0417e9879fd (diff) | |
| download | linux-50b977481fce90aa5fbda55e330b9d722733e358.tar.bz2 | |
EVM: Add support for portable signature format
The EVM signature includes the inode number and (optionally) the
filesystem UUID, making it impractical to ship EVM signatures in
packages. This patch adds a new portable format intended to allow
distributions to include EVM signatures. It is identical to the existing
format but hardcodes the inode and generation numbers to 0 and does not
include the filesystem UUID even if the kernel is configured to do so.
Removing the inode means that the metadata and signature from one file
could be copied to another file without invalidating it. This is avoided
by ensuring that an IMA xattr is present during EVM validation.
Portable signatures are intended to be immutable - ie, they will never
be transformed into HMACs.
Based on earlier work by Dmitry Kasatkin and Mikhail Kurinnoi.
Signed-off-by: Matthew Garrett <mjg59@google.com>
Cc: Dmitry Kasatkin <dmitry.kasatkin@huawei.com>
Cc: Mikhail Kurinnoi <viewizard@viewizard.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security/integrity/evm/evm.h')
| -rw-r--r-- | security/integrity/evm/evm.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/security/integrity/evm/evm.h b/security/integrity/evm/evm.h index 3d05250e8313..04825393facb 100644 --- a/security/integrity/evm/evm.h +++ b/security/integrity/evm/evm.h @@ -54,7 +54,7 @@ int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name, size_t req_xattr_value_len, char *digest); int evm_calc_hash(struct dentry *dentry, const char *req_xattr_name, const char *req_xattr_value, - size_t req_xattr_value_len, char *digest); + size_t req_xattr_value_len, char type, char *digest); int evm_init_hmac(struct inode *inode, const struct xattr *xattr, char *hmac_val); int evm_init_secfs(void); |