ima: add support for different security.ima data types
IMA-appraisal currently verifies the integrity of a file based on a
known 'good' measurement value. This patch reserves the first byte
of 'security.ima' as a place holder for the type of method used for
verifying file data integrity.
Changelog v1:
- Use the newly defined 'struct evm_ima_xattr_data'
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index becc7e0..f997997 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -45,9 +45,9 @@
static void ima_fix_xattr(struct dentry *dentry,
struct integrity_iint_cache *iint)
{
- iint->digest[0] = IMA_XATTR_DIGEST;
- __vfs_setxattr_noperm(dentry, XATTR_NAME_IMA,
- iint->digest, IMA_DIGEST_SIZE + 1, 0);
+ iint->ima_xattr.type = IMA_XATTR_DIGEST;
+ __vfs_setxattr_noperm(dentry, XATTR_NAME_IMA, (u8 *)&iint->ima_xattr,
+ sizeof iint->ima_xattr, 0);
}
/*
@@ -63,7 +63,7 @@
{
struct dentry *dentry = file->f_dentry;
struct inode *inode = dentry->d_inode;
- u8 xattr_value[IMA_DIGEST_SIZE];
+ struct evm_ima_xattr_data xattr_value;
enum integrity_status status = INTEGRITY_UNKNOWN;
const char *op = "appraise_data";
char *cause = "unknown";
@@ -77,8 +77,8 @@
if (iint->flags & IMA_APPRAISED)
return iint->ima_status;
- rc = inode->i_op->getxattr(dentry, XATTR_NAME_IMA, xattr_value,
- IMA_DIGEST_SIZE);
+ rc = inode->i_op->getxattr(dentry, XATTR_NAME_IMA, (u8 *)&xattr_value,
+ sizeof xattr_value);
if (rc <= 0) {
if (rc && rc != -ENODATA)
goto out;
@@ -89,7 +89,8 @@
goto out;
}
- status = evm_verifyxattr(dentry, XATTR_NAME_IMA, xattr_value, rc, iint);
+ status = evm_verifyxattr(dentry, XATTR_NAME_IMA, (u8 *)&xattr_value,
+ rc, iint);
if ((status != INTEGRITY_PASS) && (status != INTEGRITY_UNKNOWN)) {
if ((status == INTEGRITY_NOLABEL)
|| (status == INTEGRITY_NOXATTRS))
@@ -99,14 +100,16 @@
goto out;
}
- rc = memcmp(xattr_value, iint->digest, IMA_DIGEST_SIZE);
+ rc = memcmp(xattr_value.digest, iint->ima_xattr.digest,
+ IMA_DIGEST_SIZE);
if (rc) {
status = INTEGRITY_FAIL;
cause = "invalid-hash";
print_hex_dump_bytes("security.ima: ", DUMP_PREFIX_NONE,
- xattr_value, IMA_DIGEST_SIZE);
+ &xattr_value, sizeof xattr_value);
print_hex_dump_bytes("collected: ", DUMP_PREFIX_NONE,
- iint->digest, IMA_DIGEST_SIZE);
+ (u8 *)&iint->ima_xattr,
+ sizeof iint->ima_xattr);
goto out;
}
status = INTEGRITY_PASS;