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Diffstat (limited to 'security/integrity/ima/ima_appraise.c')
-rw-r--r--security/integrity/ima/ima_appraise.c92
1 files changed, 73 insertions, 19 deletions
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index bdc8ba1d1d27..2d4becab8918 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -42,12 +42,69 @@ int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func)
return ima_match_policy(inode, func, mask, IMA_APPRAISE);
}
-static void ima_fix_xattr(struct dentry *dentry,
+static int ima_fix_xattr(struct dentry *dentry,
struct integrity_iint_cache *iint)
{
iint->ima_xattr.type = IMA_XATTR_DIGEST;
- __vfs_setxattr_noperm(dentry, XATTR_NAME_IMA, (u8 *)&iint->ima_xattr,
- sizeof iint->ima_xattr, 0);
+ return __vfs_setxattr_noperm(dentry, XATTR_NAME_IMA,
+ (u8 *)&iint->ima_xattr,
+ sizeof(iint->ima_xattr), 0);
+}
+
+/* Return specific func appraised cached result */
+enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
+ int func)
+{
+ switch(func) {
+ case MMAP_CHECK:
+ return iint->ima_mmap_status;
+ case BPRM_CHECK:
+ return iint->ima_bprm_status;
+ case MODULE_CHECK:
+ return iint->ima_module_status;
+ case FILE_CHECK:
+ default:
+ return iint->ima_file_status;
+ }
+}
+
+static void ima_set_cache_status(struct integrity_iint_cache *iint,
+ int func, enum integrity_status status)
+{
+ switch(func) {
+ case MMAP_CHECK:
+ iint->ima_mmap_status = status;
+ break;
+ case BPRM_CHECK:
+ iint->ima_bprm_status = status;
+ break;
+ case MODULE_CHECK:
+ iint->ima_module_status = status;
+ break;
+ case FILE_CHECK:
+ default:
+ iint->ima_file_status = status;
+ break;
+ }
+}
+
+static void ima_cache_flags(struct integrity_iint_cache *iint, int func)
+{
+ switch(func) {
+ case MMAP_CHECK:
+ iint->flags |= (IMA_MMAP_APPRAISED | IMA_APPRAISED);
+ break;
+ case BPRM_CHECK:
+ iint->flags |= (IMA_BPRM_APPRAISED | IMA_APPRAISED);
+ break;
+ case MODULE_CHECK:
+ iint->flags |= (IMA_MODULE_APPRAISED | IMA_APPRAISED);
+ break;
+ case FILE_CHECK:
+ default:
+ iint->flags |= (IMA_FILE_APPRAISED | IMA_APPRAISED);
+ break;
+ }
}
/*
@@ -58,7 +115,7 @@ static void ima_fix_xattr(struct dentry *dentry,
*
* Return 0 on success, error code otherwise
*/
-int ima_appraise_measurement(struct integrity_iint_cache *iint,
+int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
struct file *file, const unsigned char *filename)
{
struct dentry *dentry = file->f_dentry;
@@ -74,9 +131,6 @@ int ima_appraise_measurement(struct integrity_iint_cache *iint,
if (!inode->i_op->getxattr)
return INTEGRITY_UNKNOWN;
- if (iint->flags & IMA_APPRAISED)
- return iint->ima_status;
-
rc = vfs_getxattr_alloc(dentry, XATTR_NAME_IMA, (char **)&xattr_value,
0, GFP_NOFS);
if (rc <= 0) {
@@ -98,19 +152,18 @@ int ima_appraise_measurement(struct integrity_iint_cache *iint,
cause = "invalid-HMAC";
goto out;
}
-
switch (xattr_value->type) {
case IMA_XATTR_DIGEST:
+ if (iint->flags & IMA_DIGSIG_REQUIRED) {
+ cause = "IMA signature required";
+ status = INTEGRITY_FAIL;
+ break;
+ }
rc = memcmp(xattr_value->digest, iint->ima_xattr.digest,
IMA_DIGEST_SIZE);
if (rc) {
cause = "invalid-hash";
status = INTEGRITY_FAIL;
- print_hex_dump_bytes("security.ima: ", DUMP_PREFIX_NONE,
- xattr_value, sizeof(*xattr_value));
- print_hex_dump_bytes("collected: ", DUMP_PREFIX_NONE,
- (u8 *)&iint->ima_xattr,
- sizeof iint->ima_xattr);
break;
}
status = INTEGRITY_PASS;
@@ -141,15 +194,15 @@ out:
if ((ima_appraise & IMA_APPRAISE_FIX) &&
(!xattr_value ||
xattr_value->type != EVM_IMA_XATTR_DIGSIG)) {
- ima_fix_xattr(dentry, iint);
- status = INTEGRITY_PASS;
+ if (!ima_fix_xattr(dentry, iint))
+ status = INTEGRITY_PASS;
}
integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode, filename,
op, cause, rc, 0);
} else {
- iint->flags |= IMA_APPRAISED;
+ ima_cache_flags(iint, func);
}
- iint->ima_status = status;
+ ima_set_cache_status(iint, func, status);
kfree(xattr_value);
return status;
}
@@ -195,10 +248,11 @@ void ima_inode_post_setattr(struct dentry *dentry)
must_appraise = ima_must_appraise(inode, MAY_ACCESS, POST_SETATTR);
iint = integrity_iint_find(inode);
if (iint) {
+ iint->flags &= ~(IMA_APPRAISE | IMA_APPRAISED |
+ IMA_APPRAISE_SUBMASK | IMA_APPRAISED_SUBMASK |
+ IMA_ACTION_FLAGS);
if (must_appraise)
iint->flags |= IMA_APPRAISE;
- else
- iint->flags &= ~(IMA_APPRAISE | IMA_APPRAISED);
}
if (!must_appraise)
rc = inode->i_op->removexattr(dentry, XATTR_NAME_IMA);