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-rw-r--r--security/integrity/ima/ima_appraise.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 1b177461f20e..4bafb397ee91 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -302,7 +302,19 @@ int ima_appraise_measurement(enum ima_hooks func,
}
out:
- if (status != INTEGRITY_PASS) {
+ /*
+ * File signatures on some filesystems can not be properly verified.
+ * On these filesytems, that are mounted by an untrusted mounter,
+ * fail the file signature verification.
+ */
+ if ((inode->i_sb->s_iflags &
+ (SB_I_IMA_UNVERIFIABLE_SIGNATURE | SB_I_UNTRUSTED_MOUNTER)) ==
+ (SB_I_IMA_UNVERIFIABLE_SIGNATURE | SB_I_UNTRUSTED_MOUNTER)) {
+ status = INTEGRITY_FAIL;
+ cause = "unverifiable-signature";
+ integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode, filename,
+ op, cause, rc, 0);
+ } else if (status != INTEGRITY_PASS) {
if ((ima_appraise & IMA_APPRAISE_FIX) &&
(!xattr_value ||
xattr_value->type != EVM_IMA_XATTR_DIGSIG)) {
@@ -319,6 +331,7 @@ out:
} else {
ima_cache_flags(iint, func);
}
+
ima_set_cache_status(iint, func, status);
return status;
}