Merge tag 'v5.5-rc5' into next

Sync up with mainline to get SPI "delay" API changes.

1 files changed, 32 insertions, 0 deletions

diff --git a/security/selinux/ss/context.h b/security/selinux/ss/context.h
index 2260c44a568c..513e67f48878 100644
--- a/security/selinux/ss/context.h
+++ b/security/selinux/ss/context.h
@@ -95,6 +95,38 @@ out:
 	return rc;
 }
 
+
+static inline int mls_context_glblub(struct context *dst,
+				     struct context *c1, struct context *c2)
+{
+	struct mls_range *dr = &dst->range, *r1 = &c1->range, *r2 = &c2->range;
+	int rc = 0;
+
+	if (r1->level[1].sens < r2->level[0].sens ||
+	    r2->level[1].sens < r1->level[0].sens)
+		/* These ranges have no common sensitivities */
+		return -EINVAL;
+
+	/* Take the greatest of the low */
+	dr->level[0].sens = max(r1->level[0].sens, r2->level[0].sens);
+
+	/* Take the least of the high */
+	dr->level[1].sens = min(r1->level[1].sens, r2->level[1].sens);
+
+	rc = ebitmap_and(&dr->level[0].cat,
+			 &r1->level[0].cat, &r2->level[0].cat);
+	if (rc)
+		goto out;
+
+	rc = ebitmap_and(&dr->level[1].cat,
+			 &r1->level[1].cat, &r2->level[1].cat);
+	if (rc)
+		goto out;
+
+out:
+	return rc;
+}
+
 static inline int mls_context_cmp(struct context *c1, struct context *c2)
 {
 	return ((c1->range.level[0].sens == c2->range.level[0].sens) &&